CN102724156A - Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals - Google Patents
Generation method as well as positioning method and device of time-division code-division orthogonal frequency division multiplexed signals Download PDFInfo
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Abstract
The invention discloses a generation method as well as a positioning method and device of time-division code-division orthogonal frequency division multiplexed signals, and belongs to the field of communication. The method comprises the following steps: receiving a data stream, performing forward error correction coding and OFDM (orthogonal frequency division multiplexing) modulation on the data stream, generating OFDM signals, and generating first spreading codes; getting second spreading codes with the code length which is not less than 511 bits, and superimposing the OFDM signals with a plurality of the second spreading codes to get superimposed OFDM spreading codes; and generating TC (time division and code division)-OFDM signals according to the first spreading codes and the superimposed OFDM spreading codes. According to the method disclosed by the invention, the GOLD codes with the code length which is not less than 511 bits are utilized for correlation integration of a 25ms time slot, the correlation integration result is increased, the cross correlation suppression property of broadcast positioning signals is improved and the positioning precision is improved. Furthermore, through frequency division operation, the property of suppressing cross correlation interference of the generated positioning signals is jointly decided by two factors, the suppression of the cross correlation interference can be well improved.
Description
Technical field
The present invention relates to the communications field, demal divides orthogonal frequency-division multiplex singal (TDMA CDMA-Orthogonal Frequency Division Multiplexing, TC-OFDM) generation method, localization method and device when particularly a kind of.
Background technology
In recent years; The increase of the progress of radiotechnics and wireless local area network technology and positioning service demand, big force urges the development of location technology, people also grow with each passing day to the demand of indoor accurate position; Particularly when the reply emergency, it is particularly important that locating information seems especially.
Existing localization method based on mobile media broadcasting network; As shown in Figure 1, when generating the broadcasting framing signal, the employing cycle, 511 GOLD sign indicating number was as spreading code; Its code check is the 5M chips/sec; Harbour partly adds the protection interval of 33.8us for 511 GOLD sign indicating numbers of 102.2us, amount to 136us, and protection is preceding 169 the filling gained by 511 GOLD sign indicating numbers at interval.This spreading code is at full-time and OFDM (Orthogonal Frequency Division Multiplexing; OFDM) signal same frequency sending; With ofdm signal mixing addition; Be modulated on certain carrier frequency, the most synthetic framing signal is launched, and is used for the catching and following the tracks of of receiver terminal of pseudo-random code ranging.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art: the cross-correlation suppression characteristic in the localization method is relatively poor, thereby positioning accuracy is relatively poor.
Summary of the invention
In order to improve the cross-correlation suppression characteristic in the localization method, and improve positioning accuracy, the embodiment of the invention provides a kind of method, localization method, device and system of the TC-OFDM of generation signal.Said technical scheme is following:
On the one hand, a kind of generation method of TC-OFDM signal is provided, said method comprises:
Receiving data stream carries out forward error correction coding and OFDM modulation to said data flow, generates ofdm signal, and generates first spreading code;
Obtain second spreading code, and said ofdm signal and a plurality of said second spreading code superposeed obtain superposeing the spreading code of OFDM, said second spreading code is a N position GOLD sign indicating number, and said N is more than or equal to 511;
Spreading code according to said first spreading code and said stack OFDM generates the TC-OFDM signal.
Wherein, said obtaining after second spreading code, said method also comprises:
Said first spreading code is done the phase multiplication with different frequencies, obtain the harbour of frequency division, and said second spreading code is done the phase multiplication with different frequencies, obtain the spread-spectrum code signals of frequency division;
Correspondingly, said said ofdm signal and a plurality of said second spreading code are superposeed obtains superposeing the spreading code of OFDM, specifically comprises:
The spread-spectrum code signals of said ofdm signal and a plurality of said frequency divisions is superposeed the spreading code of the OFDM that obtains superposeing.
Wherein, said spreading code according to said first spreading code and said stack OFDM generates the TC-OFDM signal, specifically comprises:
The spreading code of the harbour of described frequency division and said stack OFDM is modulated to obtains modulation code on the carrier frequency;
Said modulation code is carried out the interval connect, generate the TC-OFDM signal.
Wherein, said first spreading code is specially 511 the GOLD sign indicating numbers of code check more than or equal to the 1M chips/sec, and said second spreading code is specially the GOLD sign indicating number of code check more than or equal to the 1M chips/sec.
On the other hand, a kind of generating apparatus of TC-OFDM signal is provided, said device comprises:
Code modulation module is used for receiving data stream, and said data flow is carried out forward error correction coding and OFDM modulation, generates ofdm signal, and generates first spreading code;
Laminating module is used to obtain second spreading code, and said ofdm signal and a plurality of said second spreading code superposeed obtains superposeing the spreading code of OFDM, and said second spreading code is a N position GOLD sign indicating number, and said N is more than or equal to 511;
Generation module, the spreading code of the said stack OFDM that said first spreading code that is used for generating according to said code modulation module and said laminating module obtain generates the TC-OFDM signal.
Wherein, said device also comprises the frequency division module, is used for said first spreading code is done the phase multiplication with different frequencies, obtains the harbour of frequency division, and said second spreading code is done the phase multiplication with different frequencies, obtains the spread-spectrum code signals of frequency division;
Correspondingly, said laminating module specifically is used for the spread-spectrum code signals of said ofdm signal and a plurality of said frequency divisions is superposeed, the spreading code of the OFDM that obtains superposeing.
Wherein, said generation module specifically comprises modulating unit and generation unit;
Said modulating unit, the spreading code of the said stack OFDM that the harbour of the said frequency division that is used for said frequency division module is obtained and said laminating module obtain is modulated to and obtains modulation code on the carrier frequency;
Said generation unit is used for that said modulation code is carried out the interval and connects, and generates the TC-OFDM signal.
Wherein, said first spreading code is specially 511 the GOLD sign indicating numbers of code check more than or equal to the 1M chips/sec, and said second spreading code is specially the GOLD sign indicating number of code check more than or equal to the 1M chips/sec.
Another aspect, present embodiment provide a kind of localization method of using the generation method of above-mentioned TC-OFDM signal, and said localization method comprises:
Transmitting terminal generates the TC-OFDM signal, and broadcasts;
Receiving terminal is according to the said TC-OFDM signal of at least three different transmitting terminals that receive, and the coordinate of said three different transmitting terminals positions receiving terminal.
Another aspect, present embodiment provide a kind of navigation system of using the generation method of above-mentioned TC-OFDM signal, and said navigation system comprises at least three different transmitting terminals and receiving terminal,
Said transmitting terminal is used to generate the TC-OFDM signal, and broadcasts;
Said receiving terminal be used for the said TC-OFDM signal according at least three different said transmitting terminals that receive, and the coordinate of said three said transmitting terminals of difference positions to receiving terminal.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: be N (N >=511) GOLD sign indicating number decorrelation integration 25ms time slot through utilizing code length; Increased the correlation intergal result; Improve the cross-correlation suppression characteristic of TC-OFDM signal, improved positioning accuracy.And through the frequency division operation, the characteristic of the inhibition cross-correlation interference of the TC-OFDM signal of generation determines jointly that by two factors the inhibition of cross-correlation interference can access better improvement.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the broadcasting framing signal that provides of prior art;
Fig. 2 is the generation method flow diagram of the TC-OFDM signal that provides of the embodiment of the invention 1;
Fig. 3 is the generation method flow diagram of the TC-OFDM signal that provides of the embodiment of the invention 2;
Fig. 4 is the sketch map of the frequency division operation that provides of the embodiment of the invention 2;
Fig. 5 is the structural representation of the TC-OFDM signal of the generation that provides of the embodiment of the invention 2;
Fig. 6 is the structural representation of the generating apparatus of the TC-OFDM signal that provides of the embodiment of the invention 3;
Fig. 7 is another structural representation of the generating apparatus of the TC-OFDM signal that provides of the embodiment of the invention 3;
Fig. 8 is the flow chart of the localization method that provides of the embodiment of the invention 4;
Fig. 9 is the structural representation of the navigation system that provides of the embodiment of the invention 5.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
At present; Various places TV stations at different levels have constituted the CHINA RFTCOM Co Ltd that spreads all over the country already; CMMB/DAB (China Mobile Multimedia Broadcasting/Digital Audio Broadcasting; China Mobile multimedia broadcasting/digital audio broadcasting) exciter is through the broadcast type channel, for mobile phone television user provides popular service such as TV, broadcasting, urgent broadcast, web page browsing, weather forecast, stock market and government affairs information whenever and wherever possible.Therefore, mentality of designing of the present invention is to utilize ubiquitous CHINA RFTCOM Co Ltd to position, and with the saving limited wireless communication resource, and reduces cost.
Embodiment 1
Referring to Fig. 2, present embodiment provides a kind of generation method of TC-OFDM signal, and said method comprises:
Step 101: receiving data stream, data stream is carried out forward error correction coding and OFDM modulation, generate ofdm signal, and generate first spreading code;
Step 102: obtain second spreading code, and ofdm signal and a plurality of second spreading code superposeed obtain superposeing the spreading code of OFDM, second spreading code is a N position GOLD sign indicating number, and N is more than or equal to 511;
Step 103: the spreading code according to first spreading code and stack OFDM generates the TC-OFDM signal.
The method that present embodiment provides through utilizing the GOLD sign indicating number decorrelation integration 25ms time slot of code length for N (N >=511), has increased the correlation intergal result, has improved the cross-correlation suppression characteristic of TC-OFDM signal, has improved the accuracy of location simultaneously.
Embodiment 2
Referring to Fig. 3, the embodiment of the invention provides a kind of generation method of TC-OFDM signal, and said method comprises:
201: receiving data stream, this data flow is carried out forward error correction coding and OFDM modulation, generate ofdm signal;
Particularly, receive the data flow of input, this data flow is carried out forward error correction coding, interweaved and constellation mapping, and OFDM is carried out in the signal after the constellation mapping and scattered pilot and CP continuous pilot multiple connection together modulate, the generation ofdm signal.
Data stream is carried out forward error correction coding, interweaves and constellation mapping; And data stream is carried out the OFDM modulation is existing than mature technique; The embodiment of the invention does not elaborate to it, and the present invention is that example describes with BPSK (Binary Phase Shift Keying, two-phase PSK) constellation mapping only; In the practical application; Can adopt QPSK (Quadrature Phase Shift Keying, QPSK) or 16-QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) constellation mapping.
202: generate first spreading code, and obtain second spreading code;
Wherein, this step and above-mentioned 201 does not have sequencing, and first spreading code is the harbour part of each time slot of TC-OFDM signal, through utilizing first spreading code of short time, like the CDMA signal, as the guiding of TC-OFDM signal.After generating the TC-OFDM signal, transmitting terminal sends to receiver when positioning with this TC-OFDM signal, smart frequently the catching when receiver can carry out pseudo-random code ranging according to this first spreading code.
The embodiment of the invention does not limit the mode that generates first spreading code and the form of first spreading code; This first spreading code can be the GOLD sign indicating number; The embodiment of the invention is that the GOLD sign indicating number in 511 of cycles is that example describes with first spreading code, and in the practical application, first spreading code also can be the GOLD sign indicating number of other figure places; Like 1023bit CDMA (Code Division Multiple Access, code division multiple access) spreading code, 127bit spreading code etc.Particularly, it is 511 GOLD sign indicating numbers more than or equal to the 1M chips/sec that first spreading code adopts code check, can be applicable to the broadband range of 8M.It is 511 GOLD sign indicating numbers of 4M chips/sec that first spreading code in the present embodiment adopts code check, and harbour is 136us partly, has comprised 544 chips, and wherein, preceding 511 chips are 511-GOLD sign indicating numbers; Back 33 chips are 511 yards the 1st chip to the 33 chips, and when sending the TC-OFDM signal, this first spreading code is a full power transmissions.
Particularly; Second spreading code in the present embodiment adopts code length more than or equal to 511 long code; This long code can be 511,1024 or 2047 etc.; Present embodiment is that example describes with 2047 GOLD sign indicating number, and each GOLD sign indicating number cycle of 2047 is 511.75us, and code check is the 4M chips/sec.
203: first spreading code and second spreading code are carried out the frequency division operation, obtain the spread-spectrum code signals of the harbour and the frequency division of frequency division respectively;
Wherein, Frequency division in this step is operating as preferred operations, and is as shown in Figure 4, and present embodiment proposes a kind of spread-spectrum code signals based on frequency division; Can effectively suppress cross-correlation interference; Promptly first spreading code and second spreading code are all carried out the frequency division operation, obtain the spread-spectrum code signals of the harbour and the frequency division of frequency division respectively, and the spread-spectrum code signals of this frequency division and ofdm signal superposeed obtain superposeing the spreading code of OFDM.
Wherein, first spreading code is carried out the harbour that frequency division operation obtains frequency division be specially, first spreading code is done the phase multiplication with different frequencies, obtain the harbour behind the frequency division, in order to the differentiation different base stations.Second spreading code is carried out the spread-spectrum code signals that the frequency division operation obtains frequency division; And the spread-spectrum code signals of frequency division and ofdm signal carried out overlap-add operation obtain the superposeing spreading code of OFDM; Be specially, earlier second spreading code done the phase multiplication with different frequencies, obtain the spread-spectrum code signals of frequency division; In order to distinguish different base stations; Then the spread-spectrum code signals of frequency division is mixed stack with ofdm signal and obtaining the spreading code of OFDM that superposes, and the spreading code of the OFDM that will superpose is modulated on certain carrier frequency, thereby the signal after will modulating is launched with exciter.Wherein, the different frequency of doing the frequency division computing with first spreading code is with to make the different frequency of frequency division computing identical with second spreading code.
In the practical application, be Tc the time of integration among Fig. 4, and N gets 1 to n and is used for distinguishing different spread-spectrum code signals.According to f in non-coherent integration value formula
formula is different frequency deviations; Tc is the time of integration; Power spectrum for TC-OFDM; The power spectrum of the composite signal that the spread-spectrum code signals of different base station is corresponding is apart from one another by being 1/Tc; Spread-spectrum code signals when a certain base station obtains this moment of maximum non-coherent integration value; The non-coherent integration value of other spread-spectrum code signals is 0, thereby can effectively suppress cross-correlation interference.
If first spreading code and second spreading code are not carried out the frequency division operation; According to non-coherent integration value formula
when frequency deviation is 0; The non-coherent integration value just might obtain maximum; Only depend on this factor of correlation function R (t); Promptly when R (t) showed as good autocorrelation and cross correlation, cross correlation value was smaller; When autocorrelation that shows and cross correlation difference, cross correlation value is bigger.The inhibition of the cross-correlation interference in the present embodiment is determined by correlation function and two factors of sinc function jointly, thereby the inhibition of cross-correlation interference can access better improvement.
204: the spread-spectrum code signals of ofdm signal and a plurality of frequency divisions superposeed obtains superposeing the spreading code of OFDM;
Wherein, The overlap-add operation of the spread-spectrum code signals of ofdm signal and a plurality of frequency divisions; Specifically comprise: the GOLD sign indicating number of choosing code length and be N (N>511) i.e. second spreading code; Here be that 2047 GOLD sign indicating number is an example with code length, the cycle of the spreading code of stack OFDM is 24.864ms, and it is partially filled by following three: the 545th to the 2047th of (1) 2047 long code; (2) 2047 long codes that circulate 47 complete cycles; The 1st to 1744 of (3) 2047 long codes.Its gain is lower than harbour 20dB, and the spreading code of the 24.864ms of this filling is carried out the frequency division operation, subsequently with the direct stack of ofdm signal can obtain the superposeing spreading code of OFDM.
In the practical application; The quantity of second spreading code that superposes with ofdm signal is relevant with the GOLD sign indicating number of choosing; The quantity of interior second spreading code of time slot is specially (a time slot duration-harbour length)/GOLD sign indicating number cycle; As for 2047 that choose GOLD sign indicating number, the quantity of second spreading code that superposes with ofdm signal is specially (25ms-136us)/511.75us=48.6, that is to say; In a time slot; Ofdm signal and 49 2047 s' GOLD sign indicating number superposes and obtains superposeing the spreading code of OFDM, and the GOLD sign indicating number of 48 2047 complete cycles and the part chip of a GOLD sign indicating number are promptly arranged, and the part chip of this GOLD sign indicating number of present embodiment is specially preceding 1744 chips of 2047 GOLD sign indicating number.Wherein first 2047 yards is only to have chosen 545-2047, and back 48 2047 long codes are pure 2047 GOLD sign indicating numbers.
Wherein, present embodiment has adopted long second spreading code in overlap-add operation, mix with OFDM like the CDMA sign indicating number, has improved the cross-correlation suppression characteristic of the TC-OFDM signal that generates.
205: the spreading code according to harbour behind the frequency division and stack OFDM generates the TC-OFDM signal;
Particularly, the overlap-add operation in the present embodiment can directly be superposeed by ofdm signal and a plurality of second spreading code and obtain superposeing the spreading code of OFDM, and the spreading code of first spreading code and this stack OFDM is generated the TC-OFDM signal; Also can all do the frequency division operation for first spreading code and second spreading code; Second spreading code of overlap-add operation after by ofdm signal and a plurality of frequency division superposes and obtains superposeing the spreading code of OFDM; Thereby the spreading code to first spreading code behind the frequency division and stack OFDM carries out modulation operations, generates the TC-OFDM signal.
As shown in Figure 5; First spreading code and the spreading code of a stack OFDM of each time slot of the TC-OFDM signal that present embodiment generates after by a frequency division constitutes; That is to say that the TC-OFDM signal is formed by the different two parts GOLD sign indicating number fusion in sign indicating number position, wherein first spreading code behind the frequency division is 511 a GOLD sign indicating number; Superimposed code is the GOLD sign indicating number more than or equal to 511, and the interior spreading code by first spreading code behind the frequency division and a stack OFDM of time slot constitutes.
Particularly; Present embodiment has the gold sign indicating number of 48 2047 complete cycles at a time slot 25ms; Constitute with preceding 1744 chips in the 49th cycle, wherein first 2047 yards is only to have adopted 2047 yards the 545th to 2047, and back 48 2047 long codes are pure 2047 GOLD sign indicating numbers.This second spreading code will be used for the tracking of the receiver terminal of pseudo-random code ranging full-time and ofdm signal same frequency sending.Preferably, disturb for guaranteeing that this spreading code does not produce ofdm signal, the gain that this spread-spectrum code signals is sent will be lower than ofdm signal 20dB.
In the practical application; With 511 GOLD sign indicating number decorrelation integration 25ms time slots (high power harbour+superimposed code); Correlation intergal result is: 20*log10 (511/33)=23.7981dB, this correlation intergal result are the low numerical value of maximum side peakedness ratio main peak value of auto-correlation function; And employing is more than or equal to 511 GOLD sign indicating number; Like the 2047gold sign indicating number; The correlation intergal result that decorrelation integration 25ms time slot (high power harbour+superimposed code) obtains, higher than 511 numerical value that obtain, the correlation intergal result who obtains like the 2047gold sign indicating number is 20*log10 (2047/65)=30dB; It has improved about 6.2db than 511, and the cross-correlation suppression characteristic has obtained tangible improvement.
In the practical application, there are relational expression in signal bandwidth and spreading rate, BW=2Rc; BW is a signal bandwidth, and Rc is a spreading rate, when the signal that receives is the 8M bandwidth; And the code check of spreading code is when being the 5M chips/sec, the power spectrum of spread-spectrum signal head and shoulders above the broadband range of 8M, can cause certain decline; Influence the performance of receiver locating terminal, present embodiment is chosen the spreading code of suitable code check, has improved the performance of receiver locating terminal greatly.
The method that present embodiment provides through utilizing more than or equal to 511 GOLD sign indicating number decorrelation integration 25ms time slots, has increased the correlation intergal result, has improved the cross-correlation suppression characteristic of TC-OFDM signal.And the characteristic that present embodiment suppresses cross-correlation interference determines jointly that by correlation function and two factors of sinc function the inhibition of cross-correlation interference can access better improvement; In addition, it is the spreading code of 4M chips/sec that present embodiment has adopted code check, and the signal that can satisfy reception is the situation of 8M bandwidth, and the performance of receiver locating terminal improves.
Embodiment 3
Referring to Fig. 6, present embodiment provides a kind of generating apparatus of TC-OFDM signal, and said device comprises code modulation module 301, laminating module 302 and generation module 303,
Wherein, referring to Fig. 7, said device also comprises frequency division module 304; This frequency division module 304 is used for first spreading code is done the phase multiplication with different frequencies; Obtain the harbour of frequency division, and second spreading code is done the phase multiplication with different frequencies, obtain the spread-spectrum code signals of frequency division;
Correspondingly, laminating module 302 specifically be used for the spread-spectrum code signals of ofdm signal and a plurality of frequency divisions with superpose the spreading code of the OFDM that obtains superposeing.
Wherein, generation module 303 specifically comprises modulating unit and generation unit;
Said modulating unit, the harbour of the frequency division that is used for frequency division module 304 is obtained and the spreading code of the stack OFDM that laminating module 302 obtains are modulated to and obtain modulation code on the carrier frequency;
Said generation unit is used for that modulation code is carried out the interval and connects, and generates the TC-OFDM signal.
Particularly, to be specially code check be 511 GOLD sign indicating number more than or equal to the code length of 1M chips/sec to first spreading code; It is the GOLD sign indicating number of N (N >=511) more than or equal to the code length of 1M chips/sec that second spreading code is specially code check.First spreading code that adopts like, present embodiment is that code check is that the code length of 4M chips/sec is 511 a GOLD sign indicating number, and second spreading code of employing is that code check is that the code length of 4M chips/sec is the GOLD sign indicating number of N (N >=511).
Need to prove: the generating apparatus of the TC-OFDM signal that the foregoing description provides is when generating the TC-OFDM signal; Only the division with above-mentioned each functional module is illustrated; In the practical application; Can as required above-mentioned functions be distributed by the different functional completion, the internal structure that is about to device is divided into different functional, to accomplish all or part of function of above description.In addition, the generation method embodiment of the generating apparatus of the TC-OFDM signal that the foregoing description provides and TC-OFDM signal belongs to same design, and its concrete implementation procedure sees method embodiment for details, repeats no more here.
The device that present embodiment provides through utilizing the GOLD sign indicating number decorrelation integration 25ms time slot of code length for N (N>511), has increased the correlation intergal result, has improved the cross-correlation suppression characteristic of TC-OFDM signal, has improved positioning accuracy.And through the frequency division operation, the characteristic of the inhibition cross-correlation interference of the framing signal of generation determines jointly that by two factors the inhibition of cross-correlation interference can access better improvement; In addition, it is the spreading code of 4M chips/sec that present embodiment has adopted code check, and the signal that can satisfy reception is the situation of 8M bandwidth, and the performance of receiver locating terminal improves.
Embodiment 4
Referring to Fig. 8, present embodiment provides a kind of localization method of using the generation method of the TC-OFDM signal described in the foregoing description 1 or 2, states localization method and comprises:
Step 401: transmitting terminal generates the TC-OFDM signal, and broadcasts;
Step 402: receiving terminal is according to the TC-OFDM signal of at least three different transmitting terminals that receive, and the coordinate of three different transmitting terminals positions receiving terminal.
Wherein, The embodiment of the invention does not limit according to receiving the mode that the TC-OFDM signal obtains the coordinate of transmitting terminal receiving terminal; Its concrete steps can be disclosed technology contents among the CN 101616482A with reference to the one Chinese patent application publication number; The embodiment of the invention is through the three-point fix principle, according to the coordinate of three different transmitting terminals receiving terminal positioned.
The localization method that the embodiment of the invention provides receives the TC-OFDM signal that transmitting terminal sends through receiving terminal, can obtain the distance of transmitting terminal to receiving terminal according to this TC-OFDM signal, thereby according to the three-point fix principle, orient the position of receiving terminal.
Embodiment 5
Referring to Fig. 9, the embodiment of the invention provides a kind of navigation system of using the generation method of the TC-OFDM signal described in above-mentioned embodiment 1 or 2, and said navigation system comprises at least three different transmitting terminals 501 and receiving terminal 502,
Transmitting terminal 501 is used to generate the TC-OFDM signal, and broadcasts;
Receiving terminal 502 be used for the TC-OFDM signal according at least three different transmitting terminals that receive, and the coordinate of three different transmitting terminals positions to receiving terminal.
Wherein, The embodiment of the invention does not limit according to receiving the mode that the TC-OFDM signal obtains the coordinate of transmitting terminal receiving terminal; Its concrete steps can be disclosed technology contents among the CN 101616482A with reference to the one Chinese patent application publication number; The embodiment of the invention is through the three-point fix principle, according to the coordinate of three different transmitting terminals receiving terminal positioned.
The localization method that the embodiment of the invention provides receives the TC-OFDM signal that transmitting terminal sends through receiving terminal, can obtain the distance of transmitting terminal to receiving terminal according to this TC-OFDM signal, thereby according to the three-point fix principle, orient the position of receiving terminal.
Need to prove: the device of the generation TC-OFDM method that the foregoing description provides is based on the location of mobile media broadcasting network the time; Only the division with above-mentioned each functional module is illustrated; In the practical application; Can as required above-mentioned functions be distributed by the different functional completion, the internal structure that is about to device is divided into different functional, to accomplish all or part of function of above description.In addition, what the foregoing description provided belongs to same design based on the positioner of mobile media broadcasting network with localization method embodiment based on mobile media broadcasting network, and its concrete implementation procedure sees method embodiment for details, repeats no more here.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the generation method that demal divides orthogonal frequency-division multiplex singal one kind the time is characterized in that said method comprises:
Receiving data stream carries out forward error correction coding and modulating in OFDM to said data flow, generates ofdm signal, and generates first spreading code;
Obtain second spreading code, and said ofdm signal and a plurality of said second spreading code superposeed obtain superposeing the spreading code of OFDM, said second spreading code is a N position GOLD sign indicating number, and said N is more than or equal to 511;
Demal divides OFDM TC-OFDM signal when generating according to the spreading code of said first spreading code and said stack OFDM.
2. the method for claim 1 is characterized in that, said obtaining after second spreading code, and said method also comprises:
Said first spreading code is done the phase multiplication with different frequencies, obtain the harbour of frequency division, and said second spreading code is done the phase multiplication with different frequencies, obtain the spread-spectrum code signals of frequency division;
Correspondingly, said said ofdm signal and a plurality of said second spreading code are superposeed obtains superposeing the spreading code of OFDM, specifically comprises:
The spread-spectrum code signals of said ofdm signal and a plurality of said frequency divisions is superposeed the spreading code of the OFDM that obtains superposeing.
3. method as claimed in claim 2 is characterized in that, said spreading code according to said first spreading code and said stack OFDM generates the TC-OFDM signal, specifically comprises:
The spreading code of the harbour of said frequency division and said stack OFDM is modulated to obtains modulation code on the carrier frequency;
Said modulation code is carried out the interval connect, generate the TC-OFDM signal.
4. the method for claim 1 is characterized in that, said first spreading code is specially 511 the GOLD sign indicating numbers of code check more than or equal to the 1M chips/sec, and said second spreading code is specially the GOLD sign indicating number of code check more than or equal to the 1M chips/sec.
5. demal divides the generating apparatus of orthogonal frequency-division multiplex singal one kind the time, it is characterized in that said device comprises:
Code modulation module is used for receiving data stream, and said data flow is carried out forward error correction coding and modulating in OFDM, generates ofdm signal, and generates first spreading code;
Laminating module is used to obtain second spreading code, and said ofdm signal and a plurality of said second spreading code superposeed obtains superposeing the spreading code of OFDM, and said second spreading code is a N position GOLD sign indicating number, and said N is more than or equal to 511;
Generation module, the spreading code of the said stack OFDM that said first spreading code that is used for generating according to said code modulation module and said laminating module obtain, demal divides OFDM TC-OFDM signal during generation.
6. device as claimed in claim 5 is characterized in that said device also comprises the frequency division module; Be used for said first spreading code is done the phase multiplication with different frequencies; Obtain the harbour of frequency division, and said second spreading code is done the phase multiplication with different frequencies, obtain the spread-spectrum code signals of frequency division;
Correspondingly, said laminating module specifically is used for the spread-spectrum code signals of said ofdm signal and a plurality of said frequency divisions is superposeed, the spreading code of the OFDM that obtains superposeing.
7. device as claimed in claim 6 is characterized in that said generation module specifically comprises modulating unit and generation unit;
Said modulating unit, the spreading code of the said stack OFDM that the harbour of the said frequency division that is used for said frequency division module is obtained and said laminating module obtain is modulated to and obtains modulation code on the carrier frequency;
Said generation unit is used for that said modulation code is carried out the interval and connects, and generates the TC-OFDM signal.
8. device as claimed in claim 5 is characterized in that, said first spreading code is specially 511 the GOLD sign indicating numbers of code check more than or equal to the 1M chips/sec, and said second spreading code is specially the GOLD sign indicating number of code check more than or equal to the 1M chips/sec.
9. the localization method of the generation method of an application such as each described TC-OFDM signal of claim 1-4 is characterized in that said localization method comprises:
Demal divided OFDM TC-OFDM signal when transmitting terminal generated, and broadcasted;
Receiving terminal is according to the said TC-OFDM signal of at least three different transmitting terminals that receive, and the coordinate of said three different transmitting terminals positions receiving terminal.
10. the navigation system of the generation method of an application such as each described TC-OFDM signal of claim 1-4 is characterized in that said navigation system comprises at least three different transmitting terminals and receiving terminal,
Said transmitting terminal, demal divides OFDM TC-OFDM signal when being used to generate, and broadcasts;
Said receiving terminal be used for the said TC-OFDM signal according at least three different said transmitting terminals that receive, and the coordinate of said three said transmitting terminals of difference positions to receiving terminal.
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