CN101981843A - OFDM transmission device and OFDM transmission method - Google Patents
OFDM transmission device and OFDM transmission method Download PDFInfo
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- CN101981843A CN101981843A CN2009801107516A CN200980110751A CN101981843A CN 101981843 A CN101981843 A CN 101981843A CN 2009801107516 A CN2009801107516 A CN 2009801107516A CN 200980110751 A CN200980110751 A CN 200980110751A CN 101981843 A CN101981843 A CN 101981843A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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Abstract
Provided is an OFDM transmission device (10) including: a subcarrier selection unit (90), a modulation unit (30), a signal generation unit (50), a D/A converter (60), and an amplitude control unit (70). The subcarrier selection unit (90) selects a plurality of subcarriers used for transmitting digital data from subcarriers having an orthogonal relation to each other. The modulation unit (30) divides the digital data in accordance with the number of subcarriers selected by the subcarrier selection unit (90). Moreover, the modulation unit (30) modulates the subcarriers in accordance with the divided digital data to generate a plurality of modulated subcarriers. The signal generation unit (50) multiplexes a plurality of modulation subcarriers to generate a digital OFDM signal. The D/A converter (60) converts the digital OFDM signal into an analog OFDM signal for output to a transmission path. The amplitude control unit (70) adjusts the amplitude of the modulated subcarrier in accordance with the number of the subcarriers selected by the subcarrier selection unit (90) so that the power of the analog OFDM signal is a predetermined value.
Description
Technical field
The present invention relates to OFDM dispensing device and OFDM sending method.
Background technology
As seeing from WO2005/55479, OFDM (Orthogonal FrequencyDivision Multip1exing) dispensing device utilization has used the multi-carrier signal (ofdm signal) that has a plurality of subcarriers of orthogonality relation mutually to send numerical data.The OFDM dispensing device is multiplexing to utilizing a plurality of subcarriers after the modulates digital data to carry out, and generates the digital multi-carrier signal.The digital multi-carrier signal is transformed into the simulation multi-carrier signal by the D/A converter and exports to transmission channel.
In the disclosed OFDM dispensing device of above-mentioned WO2005/55479, thus do not consider the peak swing that makes ofdm signal with can be to the situation of the ability of the consistent D/A of the maximally utilising converter of peak swing of D/A converter input.
Summary of the invention
The present invention finishes in view of the foregoing, the purpose of this invention is to provide OFDM dispensing device and OFDM sending method that a kind of ability that can maximally utilise the D/A converter sends numerical data.
The OFDM dispensing device that the present invention relates to possesses subcarrier selection portion, modulation portion, ofdm signal generating unit, D/A converter and amplitude control part.Above-mentioned subcarrier selection portion selects to be used to send a plurality of subcarriers of numerical data from the subcarrier group that has orthogonality relation mutually.Above-mentioned modulation portion is cut apart above-mentioned numerical data according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion.In addition, thus above-mentioned modulation portion based on being generated a plurality of modulated sub-carriers by the above-mentioned a plurality of subcarriers of above-mentioned modulates digital data after cutting apart.Above-mentioned ofdm signal generating unit is carried out the multiplexed digital ofdm signal that generates to above-mentioned a plurality of modulated sub-carriers.Above-mentioned D/A converter is transformed into the simulation ofdm signal with above-mentioned digital ofdm signal and exports to transmission channel.Above-mentioned amplitude control part is adjusted the amplitude of above-mentioned modulated sub-carriers according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion, so that the power of above-mentioned simulation ofdm signal becomes setting.
According to this invention, the quantity that promptly is used in the above-mentioned subcarrier that sends above-mentioned numerical data changes, and it is constant that the power of above-mentioned simulation ofdm signal also remains on setting.Therefore, the ability that can maximally utilise above-mentioned D/A converter sends above-mentioned numerical data.
Preferably, the power detection portion that has the power that is used to detect above-mentioned simulation ofdm signal.Above-mentioned amplitude control part is adjusted the amplitude of above-mentioned modulated sub-carriers according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion, so that detected power becomes the afore mentioned rules value in the above-mentioned power detection portion.
By doing like this, the power precision of above-mentioned simulation ofdm signal can be set at the afore mentioned rules value well.
Preferably, the transmission channel state obtaining section that possesses the transmission channel state that is used to obtain above-mentioned each subcarrier.Above-mentioned amplitude control part is according to the quality of the transmission channel state of the above-mentioned subcarrier of transmission channel condition judgement of the obtained above-mentioned subcarrier of above-mentioned transmission channel state obtaining section.In addition, above-mentioned amplitude control part will reduce with the amplitude of the corresponding above-mentioned modulated sub-carriers of the above-mentioned preferably subcarrier of transmission channel state, will increase with the amplitude of the relatively poor corresponding above-mentioned modulated sub-carriers of above-mentioned subcarrier of transmission channel state.
By doing like this, improved communication speed thereby improved the communication precision.
Preferably, the afore mentioned rules value is that the amplitude at above-mentioned digital ofdm signal is the power of above-mentioned simulation ofdm signal that can be when the maximum of above-mentioned D/A converter input.
By doing like this, can maximally utilise the ability of D/A converter.
Preferably, the transmission channel state obtaining section that possesses the transmission channel state that is used to obtain above-mentioned each subcarrier.Above-mentioned subcarrier selection portion selects to be used to send above-mentioned a plurality of subcarriers of above-mentioned numerical data from above-mentioned subcarrier group according to the transmission channel state of the obtained above-mentioned subcarrier of above-mentioned transmission channel condition estimating portion.
By doing like this, improved communication speed thereby improved the communication precision.
The OFDM sending method that the present invention relates to has 5 steps.In the 1st step, from the subcarrier group that has orthogonality relation mutually, select to be used to send a plurality of subcarriers of numerical data.In the 2nd step, cut apart above-mentioned numerical data according to the quantity of the above-mentioned subcarrier of selecting in above-mentioned the 1st step, according to being generated a plurality of modulated sub-carriers by the above-mentioned a plurality of subcarriers of above-mentioned modulates digital data after cutting apart.In the 3rd step, above-mentioned a plurality of modulated sub-carriers are carried out the multiplexed digital ofdm signal that generates.In the 4th step, utilize the D/A converter that above-mentioned digital ofdm signal is transformed into the simulation ofdm signal and export to transmission channel.Between above-mentioned the 2nd step and above-mentioned the 3rd step, carry out the 5th step.In above-mentioned the 5th step, adjust the amplitude of above-mentioned modulated sub-carriers according to the quantity of the above-mentioned subcarrier of selecting in above-mentioned the 1st step, so that the power of above-mentioned simulation ofdm signal becomes setting.
According to this invention, the quantity that promptly is used in the above-mentioned subcarrier that sends above-mentioned numerical data changes, and it is constant that the power of above-mentioned simulation ofdm signal also remains on setting.Therefore, the ability that can maximally utilise above-mentioned D/A converter sends above-mentioned numerical data.
Description of drawings
Fig. 1 is the figure that the framework of the OFDM dispensing device of expression one embodiment of the present invention constitutes.
Fig. 2 is the key diagram of the action of the same OFDM dispensing device.
Embodiment
The OFDM dispensing device of one embodiment of the present invention (back is called " dispensing device ") 10 sends numerical data by having utilized the different and multi-carrier signal (ofdm signal) that have a plurality of subcarriers of orthogonality relation of phase crossing over frequency to not shown OFDM receiving system (back is called " receiving system ").The ofdm communication device that dispensing device 10 and receiving system constitute is used to carry out the packet communication based on the signal (ofdm signal) after the OFDM modulation.In addition, the transmission channel between dispensing device 10 and the OFDM receiving system can be wired also can be wireless.
Obtaining section 80 obtains the transmission channel state of subcarrier.For example, obtaining section 80 is accepted the transmission channel state (accepting state) of each subcarrier of ofdm signal from receiving system.The transmission channel state for example is the S/N ratio.In addition, the transmission channel state also can be BER (the Bit Error Rate error rate).
Here, the S/N of subcarrier is lower more than the high more then error rate.That is to say that S/N then can carry out high-precision communication more than high more.So, if the S/N of subcarrier than below the 1st threshold value, it is relatively poor that then selection portion 90 is estimated as the transmission channel state of subcarrier.In addition, if the S/N of subcarrier ratio has surpassed the 1st threshold value, it is better that then selection portion 90 is estimated as the transmission channel state of subcarrier.As the result that infers of transmission channel state, selection portion 90 is not selected the relatively poor subcarrier of transmission channel state but is selected transmission channel state subcarrier preferably.The selection result of the subcarrier in the selection portion 90 is notified to modulation portion 30.Obtain in obtaining section 80 under the initial condition before the transmission channel state of subcarrier, selection portion 90 is selected whole subcarriers.In addition, selection portion 90 also can be carried out the inferring of transmission channel state of subcarrier at regular intervals.In addition, also can constitute, under the situation that the transmission channel state does not almost have to change, selection portion 90 is used the result who infers when carrying out being provided with of dispensing device 10 afterwards.
Error correcting code portion 20 exports to modulation portion 30 after the additional error correcting code of the numerical data that mails to receiving system (serial bit string).By additional error correcting code, even under the relatively poor situation of transmission channel condition, also can improve the reliability of communication system.
Serial-parallel converter 31 is cut apart the numerical data of having added error correcting code according to the quantity (back is called " selection number ") of the subcarrier of selecting in the selection portion 90 and is generated parallel data.The quantity of parallel data and selection number equate.In addition, be that unit carries out cutting apart of numerical data with the signal.The quantity of the position of 1 symbology is determined by modulation system.For example, under the situation that is QPSK (QuadraturePhase Shift Keying), corresponding 2 of 1 symbol.Serial-parallel converter 31 is to symbol mapper 32 output parallel datas.
Symbol mapper 32 is transformed into the complex symbol string (IQ signal) that is used for modulated sub-carriers with each parallel data that generates in the serial-parallel converter 31.The coefficient b of the coefficient a of the in-phase component of use subcarrier and the quadrature component of subcarrier represents to constitute the complex symbol of complex symbol string with the form of a+jb (j is an imaginary unit).For example, QPSK uses the position to differ from 4 sine waves (symbol) of 90 degree mutually respectively.Define each symbol with complex symbol.Complex symbol and symbol are corresponding one by one.Table 1 has been represented the bit string among the QPSK and the corresponding relation of complex symbol.Symbol mapper 32 typically is transformed into the complex symbol string with reference to the tables of data of the corresponding relation of representing bit string and complex symbol with partition data.Symbol mapper 32 with each complex symbol string export to selection portion 90 in the corresponding subcarrier modulator 33 of subcarrier selected.
[table 1]
The subcarrier that comprises in subcarrier modulator 33 and the above-mentioned subcarrier group is corresponding one by one.The complex symbol string that subcarrier modulator 33 utilizations are accepted from symbol mapper is modulated subcarrier and is generated modulated sub-carriers.Subcarrier modulator 33 is to interleaver 40 output modulated sub-carriers.
As described above, modulation portion 30 is according to selecting number to cut apart numerical data.In addition, modulation portion 30 is modulated a plurality of subcarriers (subcarrier of selecting in the selection portion 90) according to divided numerical data, generates a plurality of modulated sub-carriers.
Interleaver 40 is changed the order (symbol order) of the modulated sub-carriers that generates in the subcarrier modulator 33 and is exported signal generating unit 50 to.By utilizing interleaver 40 can reduce the influence of burst error.
Inverse discrete Fourier transform device 51 carries out inverse discrete Fourier transform with a plurality of modulated sub-carriers that interleaver 40 obtains by each symbol unification, generates the sampled value of symbol.Inverse discrete Fourier transform device 51 is to the sampled value of serializer 52 output symbols.
Serializer 52 generates serial data (back is called " complex baseband ofdm signal ") with the sampled value serial arrangement of the symbol that inverse discrete Fourier transform device 51 obtains.
Protection interval appendix 53 to complex baseband ofdm signal supplementary protection at interval.Can prevent at interval because the intersymbol interference that the multidiameter ripple produces by supplementary protection.
Real part extraction unit 54 is extracted real part from the complex baseband ofdm signal.
The conversion that frequency changer 55 carries out the frequency of complex baseband ofdm signal generates carrier wave frequency range ofdm signal (digital ofdm signal).Frequency changer 55 is by the frequency f with local oscillator 56 outputs
CCarrier wave [cos (2 π f
CT)] multiply each other and carry out the conversion of frequency with the complex baseband ofdm signal.Frequency changer 55 is by the ofdm signal of band pass filter 57 to D/A converter 60 output numerals.
As described above, 50 pairs of a plurality of modulated sub-carriers of signal generating unit are carried out the multiplexed ofdm signal that generates numeral.
D/A converter 60 is transformed into digital ofdm signal the simulation ofdm signal and exports transmission channel to.In addition, D/A converter 60 detects the power of simulation ofdm signal.D/A converter 60 is to the testing result of the power of amplitude control part 70 output simulation ofdm signals.That is to say that D/A converter 60 plays a role as the power detection portion of the power that detects the simulation ofdm signal.
Here, ofdm signal be with selection portion 90 in all stacks and generating of the corresponding modulated sub-carriers of a plurality of subcarriers selected.Therefore, the amplitude of ofdm signal depends on the amplitude of modulated sub-carriers.The power of modulated sub-carriers depends on the amplitude of modulated sub-carriers.
(a) of Fig. 2 represented to use the state (initial condition) of whole subcarriers.In this case, so that the aggregate power of whole modulated sub-carriers becomes the target amplitude value that the mode of target power is set each modulated sub-carriers.Here, establish the S/N of the subcarrier in the frequency band W than below the 1st threshold value.In this case, like that, selection portion 90 is not selected the subcarrier in the frequency band W shown in Fig. 2 (b).So, select number to compare minimizing with initial condition.Therefore, the corresponding target amplitude value of each modulated sub-carriers that makes with the minimizing of selecting number of amplitude determination section 71 increases, so that the aggregate power of modulated sub-carriers becomes target power.
So, select the power of each modulated sub-carriers after number reduces shown in Fig. 2 (c), to increase Δ P than initial condition like that.Therefore, the aggregate power of the whole modulated sub-carriers under the initial condition and select the aggregate power of the whole modulated sub-carriers under the number minimizing situation become equal (that is, the power of simulation ofdm signal is always certain with the variation of selecting number is irrelevant).That is to say that the amplitude that inputs to the digital ofdm signal of D/A converter 60 also is always certain with the variation (increase and decrease) of selecting number is irrelevant.
And amplitude determination section 71 is by the transmission channel state correction target amplitude value of each subcarrier.Specifically, amplitude determination section 71 is according to the quality of the state of the transmission channel of the transmission channel condition judgement selection portion 90 selected subcarriers of the obtained subcarrier of obtaining section 80.If the S/N of subcarrier is than below the 2nd threshold value, it is relatively poor that then amplitude determination section 71 is judged to be the transmission channel state of subcarrier, if surpassed the 2nd threshold value, the transmission channel state that then is judged to be subcarrier is better.With the 2nd threshold setting is value greater than the 1st threshold value.That is to say that amplitude determination section 71 is judged the quality of the transmission channel state of selection portion 90 selected subcarriers.
In addition, also can make the 2nd threshold ratio the 1st threshold value little.If less than the 1st threshold value, then comparing greater than the situation of the 1st threshold value with the 2nd threshold value, the 2nd threshold value can increase the subcarrier that will use.
And, amplitude determination section 71 is with reference to above-mentioned result of determination, will with the transmission channel state preferably the target amplitude value of the corresponding modulated sub-carriers of subcarrier reduce, will increase with the target amplitude value of the relatively poor corresponding modulated sub-carriers of subcarrier of transmission channel state.But even in this case, amplitude determination section 71 is also so that the aggregate power of the modulated sub-carriers mode consistent with target power determines each target amplitude value.In addition, making the target amplitude value change how many degree suitably sets according to the transmission channel state and gets final product.In addition, can change the amplitude of variation of target amplitude value according to the quality of transmission channel state.
As described above the amplitude control part 70 of dispensing device 10 is according to the amplitude of selecting number adjustment subcarrier like that, so that the power of simulation ofdm signal becomes target power.
Therefore, promptly be used in the quantity increase and decrease of the subcarrier that sends numerical data, also consistent to the power of the simulation ofdm signal of transmission channel output with target power.
Here, the amplitude of simulation ofdm signal is by restrictions such as the specifications of the specification of communication system, D/A converter 60, law regulations the power relative restrictions of wireless signal (for example, with).On the other hand, determine the amplitude of each subcarrier by the transmission channel state of the quantity of the subcarrier that will use and subcarrier.Even identical OFDM mode, because the communication system difference, the specification of the quantity of the subcarrier that use etc. also can be different.In addition, also can there be the subcarrier that can't be used to communicate by letter in the influence because of noise and decay sometimes.
In the dispensing device 10 of present embodiment, for the amplitude that makes subcarrier is fit to the quantity of the actual subcarrier that uses, the benchmark with the quantity of the subcarrier that uses during as the amplitude of determinant carrier wave uses.So, can suppress the waste of consumed power according to dispensing device 10.And the quantity by reducing the subcarrier that will use is supplied with unnecessary power to other the subcarrier that can use.Therefore, according to dispensing device 10, can improve communication speed.In addition, dispensing device 10 can be used in the different communication system of the quantity of the subcarrier that will use jointly.
Here, preferably, the afore mentioned rules value is that the amplitude at digital ofdm signal is the power of simulation ofdm signal that can be when the maximum of D/A converter 60 inputs.By doing like this,, also can maximally utilise the ability (for example resolution) of D/A converter 60 even select the state increase and decrease of several reportedly transmission paths.In addition, preferably, D/A converter 60 constitutes, and makes the afore mentioned rules value become the maximum of the power of the simulation ofdm signal that legal provisions admit.By doing like this, can make the communication speed maximum.
But the power of simulation ofdm signal changes according to the state of the transmission channel of subcarrier sometimes.In above-mentioned example, amplitude control part 70 is adjusted the amplitude of modulated sub-carriers according to the power of detected simulation ofdm signal in the D/A converter 60.Therefore, can suppress variable power based on the simulation ofdm signal of transmission channel state.So, the power of simulation ofdm signal can be remained on setting.
In addition, in D/A converter 60, to the digital signal of D/A converter 60 input be decided by the specification of D/A converter 60 from the relation between the analog signal of D/A converter 60 outputs.So the power that can obtain the simulation ofdm signal theoretically becomes the amplitude of the modulated sub-carriers of setting.So, the power of not necessarily necessary actual detected simulation ofdm signal.But the power of simulating ofdm signal as described above changes according to the transmission channel state sometimes.So, preferably, the power of simulating ofdm signal is carried out actual detected.
In addition, amplitude control part 70 will with the transmission channel state preferably the amplitude of the corresponding modulated sub-carriers of subcarrier reduce, will increase with the amplitude of the relatively poor corresponding modulated sub-carriers of subcarrier of transmission channel state.
That is to say, amplitude control part 70 with the transmission channel state preferably the part of the power of subcarrier distribute to the relatively poor subcarrier of transmission channel state.Therefore, can improve the communication conditions of the relatively poor subcarrier of transmission channel state.Thus, improved the communication precision, its result has improved communication speed.
In addition, amplitude control part 70 not necessarily must change the amplitude of modulated sub-carriers according to the quality of transmission channel state.That is to say that amplitude control part 70 also can constitute the amplitude that makes modulated sub-carriers and all equate.
In addition, selection portion 90 selects to be used to send a plurality of subcarriers of numerical data from subcarrier group according to the transmission channel state of the obtained subcarrier of obtaining section 80.Therefore, can not use the subcarrier that can't carry out the transmission of numerical data.So dispensing device 10 can prevent the waste of power.In addition, improved the communication precision, its result has improved communication speed.
Yet in above-mentioned example, selection portion 90 automatically selects to be used to send a plurality of subcarriers of numerical data from subcarrier group according to the transmission channel state of subcarrier.But selection portion 90 also can constitute, according to the input chooser carrier wave from the outside.As the method for importing from the outside, can consider the method for manually input and the method for importing automatically.In the method for manually input, the set point that the external input device of use button, keyboard etc. will use external device (ED) to be predetermined inputs to selection portion 90.In the method for input automatically, the arithmetic unit of the outside of decision set point directly inputs to set point selection portion 90.
In addition, from the action of above-mentioned dispensing device 10 as can be seen, the OFDM sending method of one embodiment of the present invention has 5 following steps.In the 1st step, from the subcarrier group that has orthogonality relation mutually, select to be used to send a plurality of subcarriers of numerical data.In the 2nd step, cut apart numerical data according to the quantity of the subcarrier of in the 1st step, selecting.And, in the 2nd step, generate a plurality of modulated sub-carriers according to a plurality of subcarriers being modulated by the numerical data after cutting apart.In the 3rd step, a plurality of modulated sub-carriers are carried out the multiplexed digital ofdm signal that generates.In the 4th step, digital ofdm signal is transformed into the simulation ofdm signal and exports to transmission channel by the D/A converter.Here, between the 2nd step and the 3rd step, carry out the 5th step.In the 5th step, adjust the amplitude of modulated sub-carriers according to the quantity of the subcarrier of selecting in the 1st step, become setting so that simulate the power of ofdm signal.
In above-mentioned ofdm signal sending method, the quantity that promptly is used in the subcarrier that sends numerical data increases and decreases, and the power of the simulation ofdm signal of exporting to transmission channel also is controlled as setting.Therefore, according to above-mentioned ofdm signal sending method, the ability that can maximally utilise D/A converter 60 sends numerical data.
Claims (6)
1. an OFDM dispensing device is characterized in that,
Possess: the subcarrier selection portion, selection is used to send a plurality of subcarriers of numerical data from the subcarrier group that has orthogonality relation mutually; Modulation portion is cut apart above-mentioned numerical data and based on being generated a plurality of modulated sub-carriers by the above-mentioned a plurality of subcarriers of above-mentioned modulates digital data after cutting apart according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion; The ofdm signal generating unit is carried out the multiplexed digital ofdm signal that generates to above-mentioned a plurality of modulated sub-carriers; With the D/A converter, above-mentioned digital ofdm signal is transformed into the simulation ofdm signal and to transmission channel output,
The amplitude control part that possesses the amplitude of the above-mentioned a plurality of modulated sub-carriers of control;
Above-mentioned amplitude control part constitutes, and adjusts the amplitude of above-mentioned modulated sub-carriers according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion, so that the power of above-mentioned simulation ofdm signal becomes setting.
2. OFDM dispensing device according to claim 1 is characterized in that,
Power detection portion with the power that is used to detect above-mentioned simulation ofdm signal;
Above-mentioned amplitude control part constitutes, and adjusts the amplitude of above-mentioned modulated sub-carriers according to the quantity of the selected above-mentioned subcarrier of above-mentioned subcarrier selection portion, so that detected power becomes the afore mentioned rules value in the above-mentioned power detection portion.
3. OFDM dispensing device according to claim 1 is characterized in that,
The transmission channel state obtaining section that possesses the transmission channel state that is used to obtain above-mentioned each subcarrier;
Above-mentioned amplitude control part constitutes, quality according to the transmission channel state of the above-mentioned subcarrier of transmission channel condition judgement of the obtained above-mentioned subcarrier of above-mentioned transmission channel state obtaining section, to reduce with the amplitude of the corresponding above-mentioned modulated sub-carriers of the above-mentioned preferably subcarrier of transmission channel state, will increase with the amplitude of the relatively poor corresponding above-mentioned modulated sub-carriers of above-mentioned subcarrier of transmission channel state.
4. OFDM dispensing device according to claim 1 is characterized in that,
The afore mentioned rules value is that the amplitude at above-mentioned digital ofdm signal is the power of above-mentioned simulation ofdm signal that can be when the maximum of above-mentioned D/A converter input.
5. OFDM dispensing device according to claim 1 is characterized in that,
The transmission channel state obtaining section that possesses the transmission channel state that is used to obtain above-mentioned each subcarrier;
Above-mentioned subcarrier selection portion constitutes, and selects to be used to send above-mentioned a plurality of subcarriers of above-mentioned numerical data from above-mentioned subcarrier group according to the transmission channel state of the obtained above-mentioned subcarrier of above-mentioned transmission channel condition estimating portion.
6. an OFDM sending method is characterized in that,
Have: the 1st step of from the subcarrier group that has orthogonality relation mutually, selecting to be used to send a plurality of subcarriers of numerical data; Cut apart above-mentioned numerical data and according to the 2nd step that is generated a plurality of modulated sub-carriers by the above-mentioned a plurality of subcarriers of above-mentioned modulates digital data after cutting apart according to the quantity of the above-mentioned subcarrier of selecting in above-mentioned the 1st step; Above-mentioned a plurality of modulated sub-carriers are carried out multiplexed the 3rd step that generates digital ofdm signal; With the 4th step of utilizing the D/A converter that above-mentioned digital ofdm signal is transformed into the simulation ofdm signal and exports to transmission channel,
Between above-mentioned the 2nd step and above-mentioned the 3rd step, has the 5th step;
In above-mentioned the 5th step, adjust the amplitude of above-mentioned modulated sub-carriers according to the quantity of the above-mentioned subcarrier of selecting in above-mentioned the 1st step, so that the power of above-mentioned simulation ofdm signal becomes setting.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-082164 | 2008-03-26 | ||
| JP2008082164A JP5108582B2 (en) | 2008-03-26 | 2008-03-26 | OFDM transmitter and OFDM transmission method |
| PCT/JP2009/055997 WO2009119685A1 (en) | 2008-03-26 | 2009-03-25 | Ofdm transmission device and ofdm transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101981843A true CN101981843A (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801107516A Pending CN101981843A (en) | 2008-03-26 | 2009-03-25 | OFDM transmission device and OFDM transmission method |
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| Country | Link |
|---|---|
| JP (1) | JP5108582B2 (en) |
| KR (2) | KR20120113793A (en) |
| CN (1) | CN101981843A (en) |
| TW (1) | TWI388167B (en) |
| WO (1) | WO2009119685A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018094650A1 (en) * | 2016-11-24 | 2018-05-31 | 华为技术有限公司 | Modulation method and apparatus |
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| JP5407562B2 (en) | 2009-06-03 | 2014-02-05 | 富士通セミコンダクター株式会社 | Transmitter |
| JP2011259031A (en) * | 2010-06-04 | 2011-12-22 | Kyocera Corp | Radio communication device |
| WO2022011589A1 (en) * | 2020-07-15 | 2022-01-20 | Zte Corporation | Channel coding and modulation |
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| JPWO2005055479A1 (en) * | 2003-12-02 | 2007-07-05 | 松下電器産業株式会社 | Wireless transmission apparatus and peak power suppression method in multicarrier transmission |
| JP4123225B2 (en) * | 2004-11-29 | 2008-07-23 | 三菱電機株式会社 | Distortion compensation amplifier |
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2008
- 2008-03-26 JP JP2008082164A patent/JP5108582B2/en not_active Expired - Fee Related
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2009
- 2009-03-25 CN CN2009801107516A patent/CN101981843A/en active Pending
- 2009-03-25 KR KR1020127022189A patent/KR20120113793A/en not_active Application Discontinuation
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- 2009-03-25 WO PCT/JP2009/055997 patent/WO2009119685A1/en active Application Filing
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0930752A2 (en) * | 1998-01-14 | 1999-07-21 | Motorola, Inc. | Method for allocating data and power in a discrete multitone communication system |
| JPH11289312A (en) * | 1998-04-01 | 1999-10-19 | Toshiba Tec Corp | Multicarrier radio communication device |
| CN1659816A (en) * | 2002-04-08 | 2005-08-24 | 夏普株式会社 | Radio communication system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018094650A1 (en) * | 2016-11-24 | 2018-05-31 | 华为技术有限公司 | Modulation method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI388167B (en) | 2013-03-01 |
| KR101317746B1 (en) | 2013-10-15 |
| JP5108582B2 (en) | 2012-12-26 |
| TW200943857A (en) | 2009-10-16 |
| KR20100139091A (en) | 2010-12-31 |
| JP2009239549A (en) | 2009-10-15 |
| WO2009119685A1 (en) | 2009-10-01 |
| KR20120113793A (en) | 2012-10-15 |
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