CN100571419C - The method for transmitting and receiving of a kind of coding modulation and demodulation system and signal thereof - Google Patents
The method for transmitting and receiving of a kind of coding modulation and demodulation system and signal thereof Download PDFInfo
- Publication number
- CN100571419C CN100571419C CNB2004800441831A CN200480044183A CN100571419C CN 100571419 C CN100571419 C CN 100571419C CN B2004800441831 A CNB2004800441831 A CN B2004800441831A CN 200480044183 A CN200480044183 A CN 200480044183A CN 100571419 C CN100571419 C CN 100571419C
- Authority
- CN
- China
- Prior art keywords
- data
- soft
- output
- qpsk
- symbol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3488—Multiresolution systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Error Detection And Correction (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The present invention relates to the coding modulation and demodulation system of a kind of emission system, receiving system and composition thereof, and the method that transmits and receives of signal, be divided into several component sources by the information source of preparation being carried out multistage QAM modulation through processing and carry out independently QPSK modulation, and the demodulating system by the successive interference cancellation iteration, the demodulation of multistage QAM is decomposed into the some grades of QPSK demodulation that serial offsets.Making receiver be converted to the needed higher signal interference ratio of high-order orthogonal amplitude demodulation originally only needs the required lower signal interference ratio of QPSK demodulation, thereby has brought demodulation gain.Under the prerequisite that guarantees communication quality,, thereby effectively improved the implementation complexity of multistage QAM modulation simultaneously because the demodulation of QPSK is significantly simple than high-order orthogonal amplitude modulation(PAM).Simultaneously, unbalanced forward coding is redundant to be handled by the information of various constellations position is carried out, and effectively utilizes the signal interference ratio between the constellation and the disequilibrium of quality, has improved code efficiency on the whole.
Description
Technical field
The present invention relates to the method for transmitting and receiving of coding modulation and demodulation system in a kind of mobile communication system and signal thereof, relate in particular at system and the method thereof of using channel decoding and quadrature amplitude modulation demodulation.
Background technology
Quadrature amplitude modulation (QAM) is a kind of advanced person's a modulation-demodulation technique, has higher band efficiency, but it is to obtain its operating factor of highband to sacrifice its anti-interference, it is different from four-phase phase place keying (QPSK), QPSK is a kind of permanent envelope modulation technology, its entrained information fully on phase place, the no matter decay on the amplitude and how seriously disturb, as long as the phase place of modulation signal does not make a mistake, just can not cause information dropout.As shown in Figure 1, quadrature amplitude modulation is a kind of non-permanent envelope modulation technology, the poor-performing of its anti-nonlinear distortion.
As can be seen from Figure 1, the 16QAM modulation has three kinds of level, 12 kinds of phase places, and than the level unanimity of QPSK, 4 kinds of phase places are compared, and complicated many, the modulation of high-order is complicated more more, but its availability of frequency spectrum is high more.
Following table is different QAM modulation constellation characteristics comparison sheet:
| Modulation | Average power | Minimum range | Peak-to-average ratio/dB | Minimum differ (°) |
| |
10 | 0.471 | 1.8(2.6) | 16.9 |
| 32QAM | 20 | 0.343 | 10.9 | |
| 64QAM | 42 | 0.202 | 2.333(3.7) | 7.7 |
| 128QAM | 82 | 0.153 | 5.1 | |
| 256QAM | 170 | 0.094 | 2.647(4.2) | 3.7 |
| 1024QAM | 682 | 0.046 | 2.818(4.5) | 1.8 |
Annotate: the minimum range perseverance gets 2 during the average power comparison, and amplitude peak is made as 1 during the minimum range comparison, and peak-to-average ratio is to determine when average power is limited.
It can be seen from the table: the order of modulation of QAM is high more, and minimum range (minimum Eustachian distance) is more little, and peak-to-average ratio is big more, and it is more little that minimum differs.
Peak-to-average ratio is big more, and the nonlinear distortion ability that anti-nonlinear power amplifier caused is poor more; Minimum euclid distance is more little, and the interference performance of anti-Gauss's white noise is weak more; It is more little that minimum differs, and anti-phase jitter ability is poor more, strong more to the sensitiveness dependence of clock recovery accuracy.Main conclusions are: the order of modulation of QAM is high more, can not resist the quick variation of mobile telecommunication channel more, so seldom use the high-order QAM technology in mobile communication system.
After common a certain modulation signal transmitted through mobile telecommunication channel, following several variation can take place in signal:
1) signal amplitude has different decay, and attenuation generally all can ceaselessly change, and being embodied on the planisphere is exactly that constellation dwindles;
2) channel can produce various noises, relatively is typically white Gaussian noise, makes constellation point fuzzy;
3) can produce intersymbol interference and interchannel interference;
4) if demodulating system is required to move, Doppler effect can be apparent in view;
5) owing to repeatedly reflect (cable TV channel etc.) or Rayleigh fading, multidiameter (channels of various wireless transmission) etc., signal amplitude can distort, and constellation can be expanded into irregular shape;
6) because the local oscillator clock of transmitting terminal and receiving terminal is inconsistent, the time-varying characteristics of tuner, down-conversion or the like circuit and channel, signal phase can suffer damage in transmission, cause phase jitter, and, the uncertainty that is used for the frequency of the radio-frequency oscillator of down conversion on carrier frequency and the intermediate frequency can cause a very big frequency deviation, is embodied on the planisphere to rotate.
Correspondingly, a common demodulator must be accomplished:
1) to the input signal bandpass filtering;
2) matched filtering of the corresponding pulse shaping of making a start is set to eliminate intersymbol interference;
3) adjust input signal amplitude;
4) estimate to drive away carrier component;
5) adopt balancing technique with compensate for channel, eliminate the influence of dispersing;
6) recover symbol clock and carry out timing judgement with acquisition pulse amplitude and phase place;
7) actual pulse amplitude and the phase place that sends of judgement;
8) because the existence of chnnel coding must have corresponding channel-decoding to reduce the error rate.
Find out by above process for the demodulation of QAM modulation, technology realizes it being very complicated, if can pass through certain means, the modulation and demodulation of QAM being reduced to the multiple arithmetic of QPSK, and guaranteeing demodulation quality, is effectively to reduce the implementation complexity of modulating demodulating system especially.
Theory can prove that the multilevel quadrature am signals can be launched into by several four-phase phase place keyings (QPSK) combination linear and make up.Can utilize this theory significantly to improve the complexity of modulation-demodulation technique.
Found out by Fig. 1 that in addition constellation point peripheral on the planisphere obviously has higher signal interference ratio, thereby obtains error performance preferably, and the constellation point signal interference ratio of inner ring is poor slightly, error performance is also poor slightly, the disequilibrium of Here it is QAM modulation technique signal interference ratio and quality.
Therefore, tradition high-order QAM modulation-demodulation technique is not considered to adopt the method layering of a plurality of four-phase phase place keyings (QPSK) combination to handle to reduce requirement and the implementation complexity to signal interference ratio the modulation and demodulation of QAM, fully do not combine with the signal interference ratio that utilizes QAM modulation technique outer ring and inner ring constellation and the disequilibrium feature of quality yet, do not make full use of the efficient of high-order QAM modulation technique with the channel decoding technology.
Disclosure of the Invention
Technical problem to be solved by this invention is to provide a kind of coding modulation and demodulation system of being made up of emission system and receiving system and the method that transmits and receives of signal thereof, adopt the method layering of a plurality of four-phase phase place keyings (QPSK) combination to handle the modulation and demodulation of QAM to reduce complexity to the requirement and the realization of signal interference ratio, and fully combine with the signal interference ratio that utilizes QAM modulation technique outer ring and inner ring constellation and the disequilibrium feature of quality with the channel decoding technology, and make full use of the high-order QAM modulation technique, improved code efficiency on the whole.
To achieve these goals, the invention provides a kind of emission system, its characteristics are, comprise a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter.
Above-mentioned emission system, its characteristics are that the encoding rate of described first encoder is equal to or greater than the encoding rate of described second encoder.
Above-mentioned emission system, its characteristics are that the encoding rate of the data separating ratio of described data extractor and described first encoder and second encoder is complementary.
Above-mentioned emission system, its characteristics are that described first encoder and second encoder are convolution coder or Turbo encoder.
Above-mentioned emission system, its characteristics are that each circuit-switched data source is all undertaken just launching after the spread processing by one second multiplier.
The present invention also provides a kind of receiving system that is used to receive the source data signals of launching as above-mentioned emission system, its characteristics are, comprise a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
Above-mentioned receiving system, its characteristics are that described successive interference cancellation iterative receiver comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
Above-mentioned receiving system, its characteristics are, also comprise one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver,
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
Above-mentioned receiving system, its characteristics are, described successive interference cancellation iterative receiver also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
Above-mentioned receiving system, its characteristics are that described detector can be equalizer, matched filter or RAKE detector.
The present invention also provides a kind of coding modulation and demodulation system, and it comprises an emission system and a receiving system, and its characteristics are:
Described emission system comprises a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter;
Described receiving system comprises a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
Above-mentioned coding modulation and demodulation system, its characteristics are that the encoding rate of first encoder of described emission system is equal to or greater than the encoding rate of described second encoder.
Above-mentioned coding modulation and demodulation system, its characteristics are that the encoding rate of the data separating ratio of the data extractor of described emission system and described first encoder and second encoder is complementary.
Above-mentioned coding modulation and demodulation system, its characteristics are that the successive interference cancellation iterative receiver of described receiving system comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
Above-mentioned coding modulation and demodulation system, its characteristics are that described receiving system also comprises one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver,
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
Above-mentioned coding modulation and demodulation system, its characteristics are, the successive interference cancellation iterative receiver of described receiving system also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
The present invention also provides a kind of method that transmits and receives of signal, and its characteristics are, may further comprise the steps:
Step 3, coding back data are carried out interleaving treatment respectively;
Step 5, the first via data and second circuit-switched data are carried out the QPSK modulation respectively;
Step 6, first via modulating data takes advantage of 2;
Step 7, two-way modulating data carry out launching after plural addition forms one tunnel quadrature amplitude modulation signal that synthesizes;
The method that step 8, synthetic quadrature amplitude modulation signal are used the successive interference cancellation iteration receives, soft Bit data behind the formation two-way receiving demodulation;
After receiving and separate, step 9, two-way transfer soft Bit data to be deinterlaced respectively and to decipher;
The method that transmits and receives of above-mentioned signal, its characteristics are, in the step 1, form two paths of data two egress rates can according to 1: 1 concern average mark from, also can separate egress rate according to the inequality relation, the data rate of first outlet is more than or equal to the data rate to second outlet.
The method that transmits and receives of above-mentioned signal, its characteristics are that described step 8 further may further comprise the steps:
Step 8a, aerial signal is received and demodulation by detector, is used for eliminating intersymbol interference;
Step 8b, the data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data;
Acquisition hard decision result sent into first subtracter with the data of detector output after step 8c, soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
Step 8d, first subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
Step 8e, the soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
Step 8f, the output of second subtracter is the result send the 3rd qpsk demodulator, carries out the QPSK demodulation, exports soft demodulating data, and the data of the 3rd qpsk demodulator output form the soft Bit data of the first via; Simultaneously, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
Step 8g, the 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform, and the data of second symbol reformer output form the second tunnel soft Bit data.
The method that transmits and receives of above-mentioned signal, its characteristics are, in step 8d/8g, the principle that symbol is reformed is relevant with the quadrant of the demodulation symbol of first qpsk demodulator/the 3rd qpsk demodulator, if second qpsk demodulator/the 4th qpsk demodulator is sent soft Bit data X+Yj, the process of sign symbol reformation is as follows so:
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a first quartile, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is second quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a third quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X-Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a four-quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X-Yj.
The method that transmits and receives of above-mentioned signal, its characteristics are, in step 9, in ten, be deinterlaced respectively again and decipher after soft Bit data of the described first via and the first soft output signal that enters the first soft output combiner and the second soft output combiner and last iteration respectively of the second tunnel soft Bit data merge, the soft output signal that decoding back soft data enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging are returned after interweave again spread spectrum and modulation respectively, carry out the successive interference cancellation iteration, the output result after will deciphering again after the iteration of a pre-determined number is multiplexed into the received signal of correct reduction.
The method that transmits and receives of above-mentioned signal, its characteristics are that this number of iterations is 2～8 times.
Brief Description Of Drawings
Fig. 1 is the modulation constellation of typical 16QAM in the prior art;
Fig. 2 is the structure chart of the emission system in the embodiment of the invention;
Fig. 3 is the structure chart of receiving system in the embodiment of the invention;
Fig. 4 is the cut-away view of successive interference cancellation iterative receiver in the receiving unit of the present invention;
Fig. 5 is the performance simulation structure and the contrast of the embodiment of the invention.
Realize best mode of the present invention
Below in conjunction with drawings and Examples the present invention is described in further details.
Present embodiment is at emission of four antennas and four antenna receiving systems in many antenna emissions and the many antennas receiving system (MIMO), adopts high-order orthogonal amplitude modulation(PAM) (16QAM) and the hierarchical modulation coding and the demodulation decoding system of design.
As shown in Figure 2: issue that a certain user's data enters first encoder respectively after by data separating and second encoder carries out chnnel coding, the encoding rate of first encoder is 1/2 or 1/3 in the present embodiment, the encoding rate of second encoder is 1/3, guarantee the encoding rate of the encoding rate of first encoder more than or equal to second encoder, data separating is decided on the encoding rate of two encoders to the ratio of first encoder and the second encoder distributing data, if the encoding rate of first encoder and second encoder all is 1/3, data separating is separated according to 1: 1 relation exactly so, if first encoder adopts 1/2, second encoder adopts 1/3, and data separating needs to separate according to 3: 2 relation so.The bit that for example enters separator is [a, b, c, d, e], and when the encoding rate of first encoder and second encoder all was 1/3, the data that are distributed to first encoder were [a, b] so, and the data that are distributed to second encoder are [c, d], and follow-up analogizes; When the encoding rate of first encoder and second encoder was 1/2 and 1/3, the data that are distributed to first encoder were [a, b, c], the data that are distributed to second encoder are [d, e], follow-uply analogize, use different encoding rates by modulating two encoders, can preferably under the situation, provide redundant less at outer ring constellation signal interference ratio, the channel error correction coding that encoding rate is higher, under the relatively poor situation of inner ring constellation signal interference ratio, provide redundant more, the channel error correction coding that encoding rate is lower;
Data enter first interleaver and second interleaver interweaves after the coding, and interleaving technology is a prior art.First via data after the A road interweaves enter first qpsk modulator and carry out the QPSK modulation, first via data after second circuit-switched data after the B road interweaves and A road interweave are carried out entering behind the XOR second qpsk modulator and are carried out the QPSK modulation, the purpose of carrying out XOR is that natural code is converted to Gray code, thereby makes receiving terminal possess better detection performance.A, B two-way modulating data are divided into four circuit-switched data sources by serial-parallel converter again through after the complex adder
x 1,
x 2,
x 3,
x 4, each road all pass through the second multiplier group with initial data by C1～Ck channel code spread spectrum, the data behind the spread spectrum are sent from four antennas through transmitter unit group TX then.
A road device is used to produce the high order bit (1,2 bit) of the 16QAM after the modulation, and B road device is used to produce the low-order bit (3,4 bits) of modulation back 16QAM.
The 16QAM modulation symbol that obtains is:
Here
To annotate: 2 system bits 1 are mapped as+1,0 be mapped as-1, as shown in the table:
| 00 | -1，-1 |
| 10 | +1，-1 |
| 11 | +1，+1 |
| 01 | -1，+1 |
For example: input bit is [1001], and the constellation point that can obtain modulator 1 according to following formula is: [2 2], and the constellation point [1 1] of modulation 2, so
As shown in Figure 3, receiving system comprises successive interference cancellation iterative receiver, the first soft output combiner, the second soft output combiner, first deinterleaver, second deinterleaver, first decoder, second decoder, the 3rd soft output combiner, the 4th soft output combiner, the 3rd interleaver, the 4th interleaver, data collector.
The quadrature amplitude modulation signal that the successive interference cancellation iterative receiver is received air interface carries out the successive interference cancellation iteration and receives operation, finish and eliminate intersymbol interference, despreading and hierarchical de-modulating function, form the soft Bit data of two-way demodulation, the soft output that the soft Bit data of two-way demodulation enters the first soft output combiner and the second soft output combiner and last iteration respectively merges, and the two-way merging data is respectively by sending first decoder and second decoder to decipher after first deinterleaver and second deinterleaver deinterleaves.The soft output that decoding back soft data enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, merge the back data and return the successive interference cancellation iterative receiver by interweave again spread spectrum and the modulation of the 3rd interleaver and the 4th interleaver, eliminate the data that demodulated, carry out same next time iterative process then, iterative process through certain number of times, decoder output bit information reliability progressively improves, and merges the back from the result of the 3rd soft output combiner and the 4th soft output combiner through data collector this moment and just can correctly reduce the source data of launching.
For the error bit information that reduces to export soft information causes error propagation in signal subtraction, in the successive interference cancellation iterative receiver, used the weight setting method of two kinds of soft output combiners, soft output combiner is weighted summation with the soft information of last iteration and the soft information of this input, the optimum weights of this secondary data are 0.9 in the first and second soft output combiners, and the optimum weights of the data of last iteration are 0.1.The optimum weights of this secondary data are 0.75 in the third and fourth soft output combiner, and the optimum weights of the data of last iteration are 0.25.
Iteration between receiver and the decoder can unlimitedly go on, and generally speaking, considers performance and the relation that takies hardware resource, and optimum iterations is between 2～8 times.
As shown in Figure 4: the successive interference cancellation iterative receiver inside of receiving system comprises:
Detector, despreader, first qpsk demodulator, first hard decision, first subtracter, second qpsk demodulator, the reformation of first symbol, second subtracter, first qpsk demodulator, second hard decision, the 3rd subtracter, second qpsk demodulator, the reformation of second symbol, the 4th subtracter, 16QAM modulator and frequency multiplier.
Aerial signal deducts the established data of last iteration by the 4th subtracter, offset disturb after, send detector to detect, the realization of detector can be equalizer, matched filter or RAKE receiver etc., detector is used for eliminating intersymbol interference.
The data that detector detects send despreader to carry out despreading, are the data of bit-level with the data processing of chip-level.
The data of despreader output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter.
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform.
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter.
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter.
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data.And enter the second symbol reformer and carry out symbol and reform.
The data of the 3rd qpsk demodulator output form the soft Bit data b1 of the first via, b2.
The data of second symbol reformer output form the second tunnel soft Bit data b3, b4.
The two-way of sending into by external unit through the data after interweaving in the successive interference cancellation iterative receiver through 16QAM modulation again and again the process of spread spectrum send into the 4th subtracter, it has been after determining the data of information that aerial signal deducts these, can think to have deducted interference, send into detector, begin new iterative demodulation process.
The principle that symbol is reformed is relevant with the quadrant of the demodulation symbol of the 3rd qpsk demodulator, if the 4th qpsk demodulator is sent soft Bit data X+Yj, the process of sign symbol reformation is as follows so:
If the quadrant of the 3rd qpsk demodulator symbol is a first quartile, then the soft bit of b3b4 correspondence is X+Yj;
If the quadrant of the 3rd qpsk demodulator symbol is second quadrant, then the soft bit of b3b4 correspondence is-X+Yj;
If the quadrant of the 3rd qpsk demodulator symbol is a third quadrant, then the soft bit of b3b4 correspondence is-X-Yj;
If the quadrant of the 3rd qpsk demodulator symbol is a four-quadrant, then the soft bit of b3b4 correspondence is X-Yj;
As a same reason, the symbol behind second qpsk demodulator is reformed also has identical relation with the symbol quadrant of first qpsk demodulator.
To a certain antenna, below with the simple demodulation mechanism of verifying successive interference cancellation iterative receiver inside of calculating:
r
2=r-r
1, r2 is second qpsk demodulator input data, and r is for receiving data, and r1 is first qpsk demodulator demodulation output and is mapped as the QPSK modulation symbol.
Suppose to receive data and be output as r=-1+3j through detection and despreading; The first qpsk demodulator hard decision symbol is [1,0], and promptly the QPSK symbol is r
1=-2+2j, corresponding to second qpsk demodulator, obtain demodulation symbol: r
2=1+j, and the process symbol is restructured as r
2=-1+j.Why needing unit such as the 3rd qpsk demodulator, the 4th qpsk demodulator to participate in the iterative process of demodulation for the second time, is for the interference of separating the low level that a timing high position contains is for the first time removed.
The process that sign symbol is reformed is corresponding to the XOR of coding stage, but do not use the computing opposite with XOR here, mainly is the excellent properties for fear of the computing of XOR loss soft symbol.2 QPSK that two demodulators restore before the modulation merging modulate soft information.And these two the soft information of modulation are carried out QPSK respectively and be mapped as 2 system symbols [1,0,0,1].Thereby complete errorless original emission information source that recovers.
In whole mimo antennas receiving system, exist two cover iteration processes like this, the interference cancellation iterative receiver is to the iterative relation between the decoding unit, can offset many antennas and transmit and receive interference between antenna under the condition, the interference cancellation iterative receiver embedded twice iterative relation of QPSK, can effectively offset 16QAM modulation interference through causing after the air traffic channel.
Following steps of a method in accordance with the invention and key parameter have provided the simulation result of performance comparison, as shown in Figure 5:
The simulated conditions setting of embodiment:
1) 4X4 MIMO link (NT=NR=4);
2) 16QAM modulation;
3) spreading factor: Q=16;
4) K=10 orthogonal intersection is reused on all antennas;
5) interweave and coded block size: 1000 * 5114 information bits;
6) Rayleigh propagation channel:
7) chromatic dispersion decline, 3 chip time delays, 3 footpaths, 3km/h;
8) 1/3 code check, 8-state turbo coding, 1/2 code check adopt drilling method to realize (pressing 3GPP25.212);
9) Max-Log map (soft-input, soft-output) decoding algorithm;
10) 6 iteration turbo decoding;
11) ideal communication channel parameter information.
12) when hierarchical modulation, a kind of method is to have adopted the Turbo code of same-code rate (1:3) that high low level (1,2,3,4 bits from high to low) is encoded, a kind of is to have adopted the Turbo code of different coding rate that high low level is encoded, high order bit adopts 1/2 encoding rate, and low level bit adopts 1/3 encoding rate.Not adopting the encoding rate of APP (maximum a posteriori probability reception) method of hierarchical modulation is 1/3.
13) do not adopt the iterative detection structure between detector and the decoder.
Maximum a posteriori probability (APP) reception that has provided the not hierarchical coding of 16QAM modulation among Fig. 5 is compared with the performance that the hierarchical coding maximum a posteriori probability receives frame error rate and bit mistake code check.Because after adopting hierarchical coding, receiving terminal adopts the QPSK modulation, the requirement of received signal to noise ratio and the 16QAM demodulation of standard is decreased, therefore, even do not adopt the advanced configuration of iterative detection between detector and the decoder, also can in system, obtain the gain of nearly 0.5dB in the overall performance.The benefit of its maximum has been to reduce the complexity of the maximum a posteriori probability detection of receiving terminal simultaneously.
The required extra cost of this hierarchical coding is that transmitting terminal has increased an encoder, need increase demodulator, Turbo decoder of increase of a QPSK at receiving terminal.On the whole, having reduced implementation complexity effectively by the hierarchical coding scheme, improved systematic function, but increased the scale that part realizes circuit a little, is a kind of effective implementation method.
Inventive concept is not limited to offset demodulating system at two-layer modulating system of 16QAM and two-layer serial, also is applicable to the more multilayer system of high-order QAM modulation and demodulation simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Industrial applicability
After adopting the present invention, the information source of preparation being carried out multistage QAM modulation is divided into several component sources through processing and carries out independently four-phase phase place keying (QPSK) modulation, and the demodulating system by the successive interference cancellation iteration, the demodulation of multistage QAM is decomposed into the some grades of QPSK demodulation that serial offsets. Only need the required lower signal interference ratio of QPSK demodulation so that receiver is converted to the needed higher signal interference ratio of high-order orthogonal amplitude demodulation originally, thereby brought demodulation gain. Under the prerequisite that guarantees communication quality, because the demodulation of QPSK is significantly simple than high-order orthogonal amplitude modulation(PAM), thereby effectively improved the implementation complexity of multistage QAM modulation /demodulation simultaneously.
After adopting the present invention in addition, unbalanced forward coding is redundant to be processed by the information of various constellations position is carried out, at outer ring constellation signal interference ratio preferably in the situation, provide redundant less, the channel Error Correction of Coding that encoding rate is higher, in the relatively poor situation of inner ring constellation signal interference ratio, provide redundant more, the channel Error Correction of Coding that encoding rate is lower, thereby under the prerequisite that guarantees signal interference ratio and quality, effectively utilize signal interference ratio between the constellation and the disequilibrium of quality, improved on the whole code efficiency.
And as a further improvement on the present invention, the thought that the present invention embodies can realize the multilayer system that high-order QAM more transmits and receives.
Claims (22)
1, a kind of emission system, it is characterized in that, comprise a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter.
2, emission system according to claim 1 is characterized in that, the encoding rate of described first encoder is equal to or greater than the encoding rate of described second encoder.
3, emission system according to claim 2 is characterized in that, the encoding rate of the data separating ratio of described data extractor and described first encoder and second encoder is complementary.
4, emission system according to claim 3 is characterized in that, described first encoder and second encoder are convolution coder or Turbo encoder.
5, emission system according to claim 3 is characterized in that, each circuit-switched data source is all undertaken just launching after the spread processing by one second multiplier.
6, a kind of receiving system that is used to receive the source data signals that emission system as claimed in claim 1 launches, it is characterized in that, comprise a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
7, receiving system according to claim 6, it is characterized in that described successive interference cancellation iterative receiver comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
8, receiving system according to claim 7 is characterized in that, also comprises one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver,
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
9, receiving system according to claim 8, it is characterized in that, described successive interference cancellation iterative receiver also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
10, receiving system according to claim 7 is characterized in that, described detector can be equalizer, matched filter or RAKE detector.
11, a kind of coding modulation and demodulation system, it comprises an emission system and a receiving system, it is characterized in that:
Described emission system comprises a data extractor, one first encoder, one second encoder, one first interleaver, one second interleaver, an XOR device, one first qpsk modulator, one second qpsk modulator, one first multiplier and an adder;
Wherein, the primary signal source enters described data extractor, is converted into that two paths of data is delivered to first encoder respectively and second encoder is handled;
Data after data extractor is handled are delivered to first encoder and second encoder, carry out the channel error correction coding respectively at first encoder and second encoder;
Data through the channel error correction coding are sent from first encoder and second encoder respectively, enter first interleaver and second interleaver is done interleaving treatment, first interleaver carries out interleaving treatment to data, and data processed directly enters first qpsk modulator and carries out the QPSK modulation; The data of being sent by the data after the second interleaver interleaving treatment and first interleaver are sent into the XOR device together and are carried out sending into after XOR is handled second qpsk modulator again and do the QPSK modulation;
Send into first multiplier by the data that first qpsk modulator is sent, multiply by gain, obtain first data flow, the data of being sent by second qpsk modulator are second data flow, first data flow and second data flow enter adder and carry out plural addition, the latter incorporated data of adder output two-way hierarchical coding form one tunnel synthetic quadrature amplitude modulation signal;
The synthetic quadrature amplitude modulation signal in this road is transformed to the multichannel data source after the transmitter unit group is launched from antenna through a string and converter;
Described receiving system comprises a serial interference cancellation iterative receiver, one first deinterleaver, one second deinterleaver, one first decoder, one second decoder and a data collector again:
Wherein, the successive interference cancellation iterative receiver receives aerial standard quadrature amplitude modulation signal, carries out the successive interference cancellation iteration and receives processing, forms the soft Bit data after two-way receives the QPSK demodulation;
The soft Bit data of the first via send first deinterleaver deinterleaves, and data send first decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
The second tunnel soft Bit data send second deinterleaver deinterleaves, and data send second decoder to decipher after the deinterleaving, deciphers the data that finish and send data collector;
Data collector is collected first decoder and second decoder decoding data separately, carries out data multiplex, finishes the whole receiving course that quadrature amplitude modulation is separated mediation decoding.
12, coding modulation and demodulation system according to claim 11 is characterized in that, the encoding rate of first encoder of described emission system is equal to or greater than the encoding rate of described second encoder.
13, coding modulation and demodulation system according to claim 12 is characterized in that, the encoding rate of the data separating ratio of the data extractor of described emission system and described first encoder and second encoder is complementary.
14, coding modulation and demodulation system according to claim 11, it is characterized in that the successive interference cancellation iterative receiver of described receiving system comprises a detector, one first qpsk demodulator, one first hard decision device, one first subtracter, one second qpsk demodulator, one first symbol reformer, one second subtracter, one the 3rd qpsk demodulator, one second hard decision device, one the 3rd subtracter, one the 4th qpsk demodulator and one second symbol reformer:
The quadrature amplitude modulation signal that detector is received air interface detects, and is used for eliminating intersymbol interference;
The data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into first subtracter with the data of detector output after soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
First subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
The soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
The output of second subtracter is the result send the 3rd qpsk demodulator, carry out the QPSK demodulation, export soft demodulating data, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
The 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform;
The data of the 3rd qpsk demodulator output form the soft Bit data of the first via;
The data of second symbol reformer output form the second tunnel soft Bit data.
15, coding modulation and demodulation system according to claim 14, it is characterized in that, described receiving system also comprises one first soft output combiner, one second soft output combiner, one the 3rd soft output combiner, one the 4th soft output combiner, one the 3rd interleaver and one the 4th interleaver
Wherein, the soft Bit data of being sent by the successive interference cancellation iterative receiver of two-way is introduced into the first soft output combiner respectively, the soft output signal of the second soft output combiner and last iteration merges, the two-way merging data is respectively by first deinterleaver, send into first decoder after second deinterleaver deinterleaves and second decoder is deciphered, the soft output signal that soft data after the decoding enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging interweave again by the 3rd interleaver and the 4th interleaver, the successive interference cancellation iterative receiver is returned in spread spectrum and modulation, eliminate the data that demodulated, enter same next time iterative process then, through the iterative process of a pre-determined number, the data of sending from the 3rd soft output combiner and the 4th soft output combiner restore the source data of emission after data collector merges.
16, coding modulation and demodulation system according to claim 15, it is characterized in that, the successive interference cancellation iterative receiver of described receiving system also comprises a QAM modulator, one frequency multiplier, one the 4th subtracter and a despreader, data after wherein the 3rd interleaver and the 4th interleaver interweave form the last iteration data after frequency multiplier spread spectrum and QAM modulators modulate, the quadrature amplitude modulation signal that air interface is received deducts the last iteration data by the 4th subtracter earlier, send detector to detect again after offsetting interference, by despreader the data of detector output being carried out despreading then, is output again after the data of bit-level with the data processing of chip-level.
17, a kind of method that transmits and receives of signal is characterized in that, may further comprise the steps:
Step 1, original source is converted into two paths of data;
Step 2, two paths of data are carried out chnnel coding respectively;
Step 3, coding back data are carried out interleaving treatment respectively;
Step 4, the two paths of data after the interleaving treatment are carried out XOR and are handled the second new circuit-switched data of formation, first via data no change;
Step 5, the first via data and second circuit-switched data are carried out the QPSK modulation respectively;
Step 6, first via modulating data takes advantage of 2;
Step 7, two-way modulating data carry out launching after plural addition forms one tunnel quadrature amplitude modulation signal that synthesizes;
The method that step 8, synthetic quadrature amplitude modulation signal are used the successive interference cancellation iteration receives, soft Bit data behind the formation two-way receiving demodulation;
Step 9, soft Bit data is deinterlaced respectively and deciphers behind the two-way receiving demodulation;
Step 10, two-way decoding back data are multiplexed into the received signal of correct reduction.
18, the method that transmits and receives of signal according to claim 17, it is characterized in that, in the step 1, form two paths of data two egress rates can according to 1: 1 concern average mark from, also can separate egress rate according to the inequality relation, the data rate of first outlet is more than or equal to the data rate to second outlet.
19, the method that transmits and receives of signal according to claim 18 is characterized in that, described step 8 further may further comprise the steps:
Step 8a, aerial signal is received and demodulation by detector, is used for eliminating intersymbol interference;
Step 8b, the data of detector output are sent into first qpsk demodulator and are carried out the QPSK demodulation, export soft demodulating data;
Acquisition hard decision result sent into first subtracter with the data of detector output after step 8c, soft demodulating data entered the first hard decision device, and the data of detector output deduct the hard decision result and export first subtracter;
Step 8d, first subtracter output result send second qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the first symbol reformer and carry out symbol and reform;
Step 8e, the soft data of the data of detector output and the output of the first symbol reformer is all sent into second subtracter, and the data of detector output deduct the soft data of first symbol reformer output, and the result exports second subtracter;
Step 8f, the output of second subtracter is the result send the 3rd qpsk demodulator, carries out the QPSK demodulation, exports soft demodulating data, and the data of the 3rd qpsk demodulator output form the soft Bit data of the first via; Simultaneously, acquisition hard decision result sent into the 3rd subtracter with the data of detector output after soft demodulating data entered the second hard decision device, and the result that the data of detector output deduct the second hard decision device exports the 3rd subtracter;
Step 8g, the 3rd subtracter output result send the 4th qpsk demodulator to carry out the QPSK demodulation, obtains soft demodulating data, and enters the second symbol reformer and carry out symbol and reform, and the data of second symbol reformer output form the second tunnel soft Bit data.
20, the method that transmits and receives of signal according to claim 19, it is characterized in that, in step 8d/8g, the principle that symbol is reformed is relevant with the quadrant of the demodulation symbol of first qpsk demodulator/the 3rd qpsk demodulator, if second qpsk demodulator/the 4th qpsk demodulator is sent soft Bit data X+Yj, the process of sign symbol reformation is as follows so:
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a first quartile, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is second quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X+Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a third quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is-X-Yj;
If the quadrant of first qpsk demodulator/the 3rd qpsk demodulator symbol is a four-quadrant, then the soft bit of the data correspondence of the first symbol reformer/second symbol reformer output is X-Yj.
21, the method that transmits and receives of signal according to claim 20, it is characterized in that, in step 9, in ten, be deinterlaced respectively again and decipher after soft Bit data of the described first via and the first soft output signal that enters the first soft output combiner and the second soft output combiner and last iteration respectively of the second tunnel soft Bit data merge, the soft output signal that decoding back soft data enters the 3rd soft output combiner and the 4th soft output combiner and last iteration respectively merges, data after the merging are returned after interweave again spread spectrum and modulation respectively, carry out the successive interference cancellation iteration, the output result after will deciphering again after the iteration of a pre-determined number is multiplexed into the received signal of correct reduction.
22, the method that transmits and receives of signal according to claim 21 is characterized in that, this number of iterations is 2～8 times.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/001481 WO2006066445A1 (en) | 2004-12-21 | 2004-12-21 | A encoding modulation and demodulation system and its method of transmitting and receiving signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101040540A CN101040540A (en) | 2007-09-19 |
| CN100571419C true CN100571419C (en) | 2009-12-16 |
Family
ID=36601338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800441831A Expired - Fee Related CN100571419C (en) | 2004-12-21 | 2004-12-21 | The method for transmitting and receiving of a kind of coding modulation and demodulation system and signal thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100571419C (en) |
| WO (1) | WO2006066445A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547158A (en) * | 2018-11-07 | 2019-03-29 | 中国电子科技集团公司第七研究所 | A kind of coding method and interpretation method of Turbo code |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427931B (en) | 2012-05-14 | 2017-06-06 | 华为技术有限公司 | The method and apparatus of demodulating data |
| CN105723673B (en) * | 2014-05-30 | 2019-05-03 | 华为技术有限公司 | A kind of high order modulation, demodulating equipment, method and system |
| CN104579440B (en) * | 2014-11-24 | 2018-04-20 | 南京邮电大学 | A kind of design method of the direction modulated signal based on retrodirective array |
| CN106160936B (en) * | 2015-04-15 | 2020-01-17 | 中兴通讯股份有限公司 | Multi-user information processing method and device |
| CN105049399B (en) * | 2015-05-20 | 2018-10-30 | 南京邮电大学 | Direction modulated signal design method based on spatial Fourier transform |
| CN106685583B (en) * | 2015-11-07 | 2020-07-07 | 中兴通讯股份有限公司 | Multi-user superposition transmission method and device |
| US9917723B2 (en) * | 2016-03-09 | 2018-03-13 | Futurewei Technologies, Inc. | Efficient methods and recursive/scalable circuit architectures for QAM symbol mean and variance estimations |
| CN106936747B (en) * | 2017-01-17 | 2019-10-29 | 北京银河信通科技有限公司 | A kind of dual orthogonal phase modulation demodulation method of perseverance envelope |
| CN107395548B (en) * | 2017-08-02 | 2020-05-05 | 中国工程物理研究院电子工程研究所 | QAM modulation signal transmitting method based on array antenna |
| EP3745618B1 (en) | 2018-02-14 | 2024-05-01 | Huawei Technologies Co., Ltd. | Encoding and decoding methods, encoding and decoding apparatuses and encoding and decoding devices |
| CN110198285B (en) * | 2019-05-17 | 2022-02-08 | 中国工程物理研究院电子工程研究所 | Method for improving efficiency of measurement and control transmitter with 16APSK modulation system |
| WO2021016832A1 (en) * | 2019-07-30 | 2021-02-04 | Qualcomm Incorporated | Layer modulation of coded and unencoded bits |
| CN113708891A (en) * | 2021-08-12 | 2021-11-26 | 电子科技大学 | Communication system adopting deep learning CS decoder |
| CN115225202B (en) * | 2022-03-01 | 2023-10-13 | 南京大学 | Cascade decoding method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2313254C (en) * | 1996-05-17 | 2005-03-22 | Motorola Ltd | Method and apparatus for transmitting data |
| CN1404307A (en) * | 2001-08-24 | 2003-03-19 | 国家广播电影电视总局广播科学研究院 | Data frame forming method and corresponding interleaving and encoding modulation method |
| US6957175B2 (en) * | 2002-11-08 | 2005-10-18 | Interdigital Technology Corporation | Method and apparatus for determining signal-to-interference ratio with reduced bias effect |
| CN1228974C (en) * | 2003-01-09 | 2005-11-23 | 北京泰美世纪科技有限公司 | Transferring ssytem of signal communication in digital multimedia broadcast system and mode |
-
2004
- 2004-12-21 CN CNB2004800441831A patent/CN100571419C/en not_active Expired - Fee Related
- 2004-12-21 WO PCT/CN2004/001481 patent/WO2006066445A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547158A (en) * | 2018-11-07 | 2019-03-29 | 中国电子科技集团公司第七研究所 | A kind of coding method and interpretation method of Turbo code |
| CN109547158B (en) * | 2018-11-07 | 2022-03-22 | 中国电子科技集团公司第七研究所 | Encoding method and decoding method of Turbo code |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006066445A1 (en) | 2006-06-29 |
| CN101040540A (en) | 2007-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100571419C (en) | The method for transmitting and receiving of a kind of coding modulation and demodulation system and signal thereof | |
| US6665348B1 (en) | System and method for interoperable multiple-standard modulation and code selectable Feher's GMSK, enhanced GSM, CSMA, TDMA, OFDM, and third-generation CDMA, W-CDMA and B-CDMA | |
| US7376180B2 (en) | Adaptive receivers for bit rate agile (BRA) and modulation demodulation (modem) format selectable (MFS) signals | |
| US7593481B2 (en) | CDMA, W-CDMA, 3rd generation interoperable modem format selectable (MFS) systems with GMSK modulated systems | |
| US8050345B1 (en) | QAM and GMSK systems | |
| CN1213547C (en) | Multipath cdma receiver for reduced pilot | |
| US8000377B2 (en) | System and method for variable rate multiple access short message communications | |
| US7620881B2 (en) | System and method for communicating data using iterative equalizing and decoding and recursive inner code | |
| US20070053472A1 (en) | Receivers and demodulators for tdma and other modulated sytems | |
| US20030048834A1 (en) | Spectrally efficient FQPSK, FGMSK, and FQAM for enhanced performance CDMA, TDMA, GSM, OFDM, and other systems | |
| US20120321007A1 (en) | QAM CDMA and TDMA Communication Methods | |
| CN1237729C (en) | CDMA system which uses pre-rotation before transmission | |
| KR20040067707A (en) | Constant amplitude coded bi-orthogonal coding and decoding apparatus | |
| EP1872483B1 (en) | Low complexity system and method for efficient communication of (G)MSK signals | |
| CN100382475C (en) | Transmitting device and receiving device | |
| EP2391044A2 (en) | A receiver for a wireless telecommunication system with a channel deinterleaver | |
| US20070058756A1 (en) | Reduced complexity soft output demapping | |
| US8395986B2 (en) | Transmitter and receiver | |
| JPH07143098A (en) | Ofdm transmitter and ofdm receiver | |
| CN101433040A (en) | Communications system with selective Baseband Pilot Injected Carrier (BPIC) and input data modulation and related methods | |
| WO2003024048A2 (en) | Hierarchical modulation | |
| KR101524780B1 (en) | Apparatus and method for communication using Near Golay sequence | |
| CN101433039A (en) | Communications system with baseband pilot injected carrier (BPIC) modulation/demodulation and frame recovery and related methods | |
| Patel et al. | Design of BPSK/QPSK modulator using verilog HDL and matlab | |
| Fines et al. | Performance evaluation of high level coded modulation over satellite channels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20070919 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Coding modulation and demodulation system and method for transmitting and receiving signal thereof Granted publication date: 20091216 License type: Common License Record date: 20151123 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20191221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |