CN105743835A - Method for reducing peak-to-average power ratio of OFDMA system signal - Google Patents
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Abstract
The invention discloses a method for reducing the peak-to-average power ratio of an OFDMA system signal. The method specifically comprises the following steps of: at a transmitting end, coding data input by a user through a LDPC coder, generating a coding codeword including a plurality of reversible subsets, and modulating; mapping the modulated data to a subcarrier distributed to the user, and constructing a plurality of reversible frequency-domain symbol sets; performing independent reversal of the constructed reversible frequency-domain symbol sets to reduce the peak-to-average power ratio of the OFDMA system signal; at a receiving end, demapping and demodulating the subcarrier after performing Fourier transform of the received signal to obtain received information corresponding to each user, decoding by adopting a LDPC decoder, and extracting phase reversal information from the obtained decoding codeword so as to recover original information. By means of the invention, the peak-to-average power ratio of the OFDMA system signal can be effectively reduced; sideband information is unnecessary to send; the spectrum utilization rate of the system is increased; the complexity of the system is reduced; and simultaneously, the system has good error correction performance.
Description
Technical field
The invention belongs to signal processing technology field, more particularly, to a kind of method reducing OFDMA system signal peak-to-average power power ratio.
Background technology
OFDM (OFDMA) technology, as a kind of extension of OFDM (OFDM) technology, is widely used in system of broadband wireless communication.But its signal of communication has higher peak value and average power ratio, i.e. peak-to-average power ratio (PAPR).Higher PAPR requires the radio-frequency front-end in communication system, as power amplifier, digital to analog converter etc. have wider linear dynamic range.If using the radio-frequency front-end of broad linear dynamic range, can cause that the cost of base station and terminal is greatly increased；If using the radio-frequency front-end of narrower linear dynamic range, can cause that inband signaling distortion and out of band spectrum are revealed, causing communication system performance to decline to a great extent.
Prior art has the technical scheme of a lot of PAPR reducing ofdm signal, such as selective mapping (SLM), partial transmission sequence method (PTS) and the scheme based on coding；Although wherein SLM and PTS method can significantly decrease the PAPR of ofdm signal, however it is necessary that the phase rotation coefficient adopted by transmitting terminal is sent to receiving terminal as side information, this can cause that system data transfer rate declines and adds system complexity.
The Chinese patent that notification number is CN102624665B proposes a kind of method reducing ofdm signal PAPR based on NS-LDPC code, the method adopts the LDPC code of a kind of special construction, can effectively reduce ofdm signal PAPR, and hardly error rate of system performance and system data transfer rate be impacted；But, the method lays particular emphasis on NS-LDPC code book body more, and only considered the application of single user scene decline low signal PAPR, not for the multi-user scene in OFDMA system, carry out adaptation also without its codeword structure, concrete modulation system being mapped with the subcarrier in OFDMA system.
Summary of the invention
Disadvantages described above or Improvement requirement for prior art, the invention provides a kind of method reducing OFDMA system signal peak-to-average power power ratio, IS-LDPC code is utilized to realize reducing the function of peak-to-average power ratio, side information need not be transmitted, while significantly reducing OFDMA system signal PAPR, there is good error-correcting performance.
For achieving the above object, according to one aspect of the present invention, it is provided that a kind of method reducing OFDMA system signal peak-to-average power power ratio, including the process of the process of transmitting terminal and receiving terminal；
The process of its transmitting terminal comprises the steps:
(A1) according to the check matrix H of IS-LDPC code, the information data of user is encoded, generates the IS-LDPC code word A=[A having U subset of can reversing0,A1,…,AU]；
Wherein Au(u=1,2 ..., U) represent that u can reverse subset, each can inverted rotor to be concentrated with a bit be phase bits, phase bits is fixed as 0, A when coding0Presentation code bit is not belonging to the set of the remaining bits of U subset of can reversing；
(A2) running time-frequency resource in each Resource Block persistent period in OFDMA system is divided, and give multiple users by ready-portioned resource block assignments；
(A3) coding codeword of each user carrying out PSK/QAM modulation, and be mapped on the subcarrier of user resources block by the symbol after modulation, structure can reverse frequency domain symbol set, it is thus achieved that OFDMA time-domain symbol；
(A4) the frequency domain symbol set of respectively can reversing in each OFDMA time-domain symbol is carried out reversion process, obtain multiple candidate's OFDMA time-domain symbol, therefrom select OFDMA time-domain symbol minimum for PAPR, it is carried out inverse fast Fourier transform, it is thus achieved that send out the OFDMA signal sent；
The process of its receiving terminal comprises the steps:
(B1) fast Fourier transform, subcarrier demapping and demodulation are carried out to the received signal, and the resource block assignments situation according to transmitting terminal, obtain the reception information corresponding to each user, then adopt ldpc decoder to decode, it is thus achieved that code word
(B2) position of phase bits when encoding according to transmitting terminal, from the code word that decoding obtainsThe middle inversion information extracting U subset of can reversing, it is thus achieved that phase bits vector b=[b1,b2,…,bU],
Wherein bu∈ 0,1} (u=1,2 ..., U)；
(B3) by U phase bits in vector b and code wordIn U subset of can reversing carry out xor operation respectively, and then recover original code word A:
Wherein NuRepresent each can inverted rotor concentrate bit number；For binary coding, reverse turn operation is equivalent to and the bit phase bits corresponding with this subset concentrated of inverted rotor will can carry out XOR.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, its step (A2) is specific as follows:
(A2.1) running time-frequency resource in each Resource Block persistent period in OFDMA system being divided into multiple mutually disjoint Resource Block, each Resource Block occupies NRBIndividual subcarrier in frequency domain and KRBIndividual time-domain symbol length；
(A2.2) according to proportional fair scheduling, multiple users are given by ready-portioned resource block assignments；While ensureing the transfer rate fair relatively of each user, improve total system transfer rate；
The data of different user are when separate frequency-selective channel is transmitted, the all very poor probability of all users channel response on certain Frequency point can be only small, if this subcarrier now being distributed to the good user of channel condition be transmitted, other subcarriers are also such, just can produce multi-user diversity gain, the transfer rate of raising system, it is therefore desirable to follow certain resource allocation policy, gives multiple users by ready-portioned resource block assignments；
Can adoption rate fair scheduling algorithm (P.Viswanath, D.N.C.Tse, andR.Laroia, " Opportunisticbeamformingusingdumbantennas, " IEEETransactionsonInformationTheory, vol.48, no.6, pp.1277-1294, Jun2002), while ensureing the transfer rate fair relatively of each user, improve system transfer rate.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, in its step (A3), all bits of each subset of reversing are mapped on the frequency domain symbol of the same time-domain symbol in same Resource Block；Each OFDMA time-domain symbol contains multiple frequency domain symbol set of reversing.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, in its step (A3), that modulation maps it is crucial that: in modulation mapping process, structure can reverse frequency domain symbol set；
The sign bit of all symbols in frequency domain symbol set that can reverse both is from one or more IS-LDPC and can reverse subset, and the one or more IS-LDPC can be mapped to the sign bit of this frequency domain symbol set by all bits of concentrating of inverted rotor.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, its step (A4) is specific as follows:
(A4.1) for frequency domain symbol set of can reversing, entirety is multiplied by reversion factor p；
The value set of the reversion factor is that { 1 ,-1}, p represents nonreversible when being 1, represents reversion when p is for-1；For qam mode, when certain qam symbol is multiplied by the reversion factor-1, in bit set corresponding to this qam symbol, only partial bit can be reversed, other bits then remain unchanged, the bit that reversion occurs is called " sign bit ", the bit not having reversion is called " amplitude bit ", and described reversion refers to that bit 0 becomes bit 1, or bit 1 becomes bit 0；
(A4.2) whether each OFDMA time-domain symbol independently controls the reversion of its frequency domain symbol set of respectively can reversing comprised；Obtain multiple candidate's OFDMA time-domain symbol, therefrom select OFDMA time-domain symbol minimum for PAPR, through inverse fast Fourier transform, it is thus achieved that send out the OFDMA signal sent.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, the decoding process in its step (B1) is specific as follows:
It is 0 by the phase bits assignment of the reversed subset corresponding to amplitude bit so that it is confidence level is infinitely great；And the phase bits of the reversed subset corresponding to amplitude bit is participated in as known results the iterative decoding of other bits, it is thus achieved that code word
Owing to the phase bits of known each subset of reversing is fixed as 0 when coding, and in the process that frequency domain symbol set is carried out reverse turn operation, the amplitude bit of each frequency domain symbol remains unchanged, namely the phase bits of the reversed subset corresponding to amplitude bit remains in that to be 0, therefore adopt in the process of LDPC iterative decoding at receiving terminal, can be directly 0 by the phase bits assignment of the reversed subset corresponding to amplitude bit, it can be used as known results to participate in the iterative decoding of other bits.
The method of reduction OFDMA system signal peak-to-average power power ratio provided by the invention, at transmitting terminal, encodes user data through IS-LDPC encoder, generates the coding codeword with multiple subset of reversing；Carry out PSK/QAM modulation again, then modulation symbol is mapped on the subcarrier that user is assigned to, construct multiple frequency domain symbol set of reversing；By the reversed frequency domain symbol set of structure is carried out independent reversion, to reduce the peak-to-average power ratio of OFDMA system signal, in the process, do not need to send phasing back information；
At receiving terminal, subcarrier demapping and PSK/QAM demodulation is carried out again after being fourier transformed by the signal received, obtain the reception information that each user is corresponding, then utilize ldpc decoder to decode, after extracting phasing back information from the code word obtained, can correctly recover raw information.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to obtain following beneficial effect:
(1) method of reduction OFDMA system signal PAPR provided by the invention, while significantly reducing system signal PAPR, side information need not be transmitted, improve the availability of frequency spectrum of system, reduce the complexity of system, and have the error-correcting performance that the LDPC coding with standard is essentially identical；
(2) method of reduction OFDMA system signal PAPR provided by the invention, for the multi-user scene in OFDMA system, namely the scene that multiple users communicate on different subcarriers simultaneously, adopt can the reverse method of frequency domain symbol set of independent reversion to reduce signal PAPR, and provide the make of frequency domain symbol set of can reversing；
First the running time-frequency resource of OFDMA system being divided into mutually disjoint Resource Block, each Resource Block occupies NRBIndividual subcarrier in frequency domain and KRBIndividual time-domain symbol length；Then according to resource allocation policy, multi-user is carried out the distribution of Resource Block；In conjunction with concrete modulation, such as QPSK modulation or 16QAM modulation, adopt suitable subcarrier mapping mode, reversed subset corresponding to the IS-LDPC code of multi-user is mapped on corresponding Resource Block, frequency domain symbol set of can reversing is constructed with this, make the sign bit of all symbols in set both be from one or more IS-LDPC can reverse subset, and the one or more IS-LDPC can be mapped on the sign bit of described frequency domain symbol set by all bits of concentrating of inverted rotor, and then keep the data transmission independence of multi-user；
Comparatively speaking, publication number lays particular emphasis on NS-LDPC code book body for the prior art that CN102624665B Chinese patent provides, only consider the application of single user scene decline low signal PAPR, namely at any one time, data on all subcarriers, both from the scene of same user, do not provide the solution being mapped on subcarrier by the reversed subset in code word under multi-user scene.
Accompanying drawing explanation
The Resource Block that Fig. 1 is OFDMA system in the embodiment of the present invention divides；
Fig. 2 is the schematic diagram of " OFDMA time-domain symbol " in the embodiment of the present invention, " time-domain symbol of Resource Block " and " frequency domain symbol "；
Fig. 3 is the structured flowchart of subcarrier mapping, reverse turn operation and inverse Fourier transform (IFFT) that the embodiment of the present invention carries out at transmitting terminal；
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitute conflict each other.
In embodiment, the running time-frequency resource of OFDMA system is divided into multiple Resource Block, as it is shown in figure 1, each Resource Block occupies a number of subcarrier in frequency domain and certain time-domain symbol length, wherein the persistent period of each Resource Block is designated as time-slot；For user i, it is assigned to a Resource Block in each time-slot, and each Resource Block occupies NRBIndividual subcarrier in frequency domain and KRBIndividual time-domain symbol length；Wherein, the number of sub carrier wave of OFDMA system is NDL, NDLFor positive integer, the Resource Block quantity of each time-slot is W, W is positive integer；W=NDL/NRB。
IS-LDPC code of the present invention is a kind of special low density parity check code, has following unique structure:
(1) IS-LDPC code has U subset of can reversing, and does not occur simultaneously between these subsets；Subset of can reversing is constituted, wherein U >=1 by the set of some coded-bits of LDPC code；
(2) having a bit in the coded-bit set of each subset of reversing is phase bits, and phase bits is fixed as 0 when coding, if having reversed certain subset of can reversing, then the phase bits of its correspondence becomes 1；
(3) each subset of reversing all can independently be reversed, and reverse simultaneously and one or more the new code word that obtains can remain effective code word after the coded-bit concentrated of inverted rotor；Wherein, reversion refers to and bit 0 becomes bit 1, or bit 1 is become bit 0；
Due to respectively can inverted rotor to be concentrated with a bit be phase bits, and be fixed as 0 when coding；If certain the reversed subset in IS-LDPC code has been carried out reverse turn operation, then the phase bits of its correspondence becomes 1；Carry out reverse turn operation without to certain the reversed subset in IS-LDPC code, then the phase bits of its correspondence is still 0；Therefore it is used for this phase bits indicating whether reversed subset corresponding in IS-LDPC code there occurs reversion, the phase bits that decoding obtains is utilized to know the inversion information of each subset of reversing at receiving terminal, thus judging whether the reversed subset of its correspondence there occurs reversion, and then correctly recover raw information.
As shown in Figure 2, frequency domain symbol represents the PSK/QAM modulation symbol on each subcarrier for OFDMA time-domain symbol in embodiment, the time-domain symbol of Resource Block and frequency domain symbol；The time-domain symbol of Resource Block represents within the persistent period of an OFDMA time-domain symbol, the frequency domain symbol set on the subcarrier of each Resource Block.
In embodiment, carry out the structured flowchart of subcarrier mapping, reverse turn operation and inverse Fourier transform (IFFT) as it is shown on figure 3, include the process of frequency domain and time domain at transmitting terminal.
The method of the reduction OFDMA system signal PAPR that embodiment provides, specific as follows:
(1) coding step: the information data of user is encoded according to the check matrix H of IS-LDPC code, generate the IS-LDPC code word A=[A having U subset of can reversing0,A1,…,AU], wherein Au(u=1,2 ..., U) represent and can reverse subset, each can inverted rotor to be concentrated with a bit be phase bits, phase bits is fixed as 0, A when coding0Presentation code bit is not belonging to the set of the remaining bits of U subset of can reversing.
(2) division of Resource Block, allocation step:
(2.1) in OFDMA system as shown in Figure 1, the running time-frequency resource in each time-slot is divided into M mutually disjoint Resource Block, and each Resource Block occupies NRBIndividual subcarrier in frequency domain and KRBIndividual time-domain symbol length；
(2.2) according to Proportional Fair principle, carry out data transmission the resource block assignments of division to multiple users, while ensureing each user's transfer rate fair relatively, improve total system transfer rate.
(3) modulation, subcarrier mapping step:
The coding codeword of each user is carried out PSK/QAM modulation；And the symbol after modulation is mapped on the subcarrier of user resources block, structure can reverse frequency domain symbol set；
Wherein, all bits of each subset of reversing to be mapped on the frequency domain symbol of the same time-domain symbol in same Resource Block；
By this step, it is thus achieved that each OFDMA time-domain symbol X, wherein X is in each OFDMA time-domain symbol persistent period, the frequency domain symbol set of transmission on subcarrier.
(4) reversion, forwarding step:
Frequency domain symbol set entirety of can reversing is multiplied by reversion factor p, it is thus achieved that multiple candidate's OFDMA time-domain symbol, therefrom selects OFDMA time-domain symbol minimum for PAPR, it is carried out fast Fourier transforma, it is thus achieved that send out the OFDMA signal sent；
In embodiment, the value set of the reversion factor is that { 1 ,-1}, p represents nonreversible when being 1, represents reversion when p is for-1；
Independent reversion frequency domain symbol set is to reduce specifically comprising the following steps that of signal PAPR
(4.1) number of frequency domain symbol set of can reversing in each OFDMA time-domain symbol is M, is designated as X(1),X(2),…,X(M)；To each frequency domain symbol set X that reverses(m)It is multiplied by phasing back factor pm, it is thus achieved that treated OFDMA time-domain symbol
By traveling through M all possible value of the phasing back factor, generate raw 2MPlant different OFDMA time-domain symbol, i.e. candidate OFDMA time-domain symbol；
Wherein, pmValue set be 1 ,-1}；
(4.2) from above-mentioned 2MPlant and candidate's OFDMA time-domain symbol selects OFDMA time-domain symbol minimum for PAPR, through inverse fast Fourier transform, it is thus achieved that send out the OFDMA signal sent.
(5) reception, subcarrier demapping, demodulation, decoding procedure:
Receiving terminal carries out fast Fourier transform, subcarrier demapping and PSK/QAM demodulation the resource allocation result according to transmitting terminal to the received signal, obtains the reception information corresponding to each user；
Docking is collected mail to cease and is adopted ldpc decoder to decode, in the process of iterative decoding, it is directly 0 by the phase bits assignment of the reversed subset corresponding to amplitude bit so that it is confidence level is infinitely great, the iterative decoding of other bits is participated in, it is thus achieved that code word as known results
(6) phasing back information is extracted:
According to the position of phase bits when transmitting terminal encodes, from code wordThe middle inversion information extracting U subset of can reversing, obtains phase bits vector b=[b1,b2,…,bU], wherein
bu∈ 0,1} (u=1,2 ..., U)；
(7) raw information is recovered:
By U phase bits in vector b and code wordIn U subset of can reversing carry out xor operation respectively, recover original code word A:
Wherein NuRepresent each can inverted rotor concentrate bit number.
In embodiment, relate to parameter specific as follows:
Considering downlink OFDMA system, data subcarrier number is NDL=720, each Resource Block occupies 24 subcarrier in frequency domain and 2 time-domain symbol length, there is 720/24=30 Resource Block in each time-slot, and the frequency domain symbol set corresponding to the time-domain symbol in each Resource Block is frequency domain symbol set of can reversing, i.e. M=30；
Adopt two kinds of modulation systems of gray mappings QPSK and 16QAM；The code check of IS-LDPC code is 0.5, and code length is N=1056, comprises 22 subsets of can reversing, and each subset of reversing has 48 coded-bits, i.e. Nu=48, last bit in subset, as phase bits, is fixed as 0 during coding；Ldpc code decoder iterative decoding number of times is 500 times；For PTS method, packet count W=30, phase rotation coefficient value set be-1,1}.
Simulation result shows: on the basis of not transmitted sideband information, and the present invention is just the same with the effect adopting PTS method reduction OFDMA system signal PAPR, can reach the identical effect reducing OFDMA signal peak-to-average power power ratio.
For awgn channel and frequency selective fading channels, the method of reduction OFDMA system signal PAPR provided by the invention, on the basis of not transmitted sideband information, the FER result obtained and employing PTS method and LDPC encode, and assume that the FER result that recipient obtains when being properly received side information completely is all essentially identical.
Under frequency selective fading channels (the vehicular channel A in ITU-RM.1225) condition, as packet count W=30, when adopting QPSK modulation system, it is 10 at FER-2Place, the signal to noise ratio snr=6.3dB needed during the present invention not transmitted sideband information, signal to noise ratio snr=6.25dB that recipient needs when being properly received side information completely；Visible, the present invention can well recover side information at receiving terminal, i.e. each inversion information of subset that can reverse, thus avoiding the transmission of side information, system data transfer rate will be caused to decline because of transmitted sideband information；Greatly reduce the complexity of system, and have good error-correcting performance.
Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (5)
1. the method reducing OFDMA system signal peak-to-average power power ratio, including the process of the process of transmitting terminal and receiving terminal, it is characterised in that
The process of described transmitting terminal comprises the steps:
(A1) according to the check matrix H of IS-LDPC code, the information data of user is encoded, generates the IS-LDPC code word A with U subset of can reversing；Each described phase bits can reversed in subset is set to 0；
(A2) running time-frequency resource in each Resource Block persistent period in OFDMA system is divided, and the resource block assignments obtained will be divided to user；
(A3) coding codeword of each user is modulated, the symbol after modulation is mapped on the subcarrier of user resources block；And can be reversed frequency domain symbol set by structure, it is thus achieved that OFDMA time-domain symbol；
(A4) the reversed frequency domain symbol set in each OFDMA time-domain symbol is carried out reversion process, it is thus achieved that multiple candidate's OFDMA time-domain symbol；From described candidate's OFDMA time-domain symbol, select OFDMA time-domain symbol minimum for PAPR, and it is carried out inverse fast Fourier transform, it is thus achieved that send out the OFDMA signal sent；
The process of described receiving terminal comprises the steps:
(B1) fast Fourier transform, subcarrier demapping and demodulation are carried out to the received signal, and the resource block assignments situation according to transmitting terminal, it is thus achieved that the reception information corresponding to each user；And adopt ldpc decoder to decode, it is thus achieved that code word
(B2) position according to phase bits place, from described code wordThe middle inversion information extracting U subset of can reversing, obtains phase bits vector b；
(B3) by U phase bits in described phase bits vector b and code wordIn U subset of can reversing carry out xor operation respectively, recover original code word A.
2. the method reducing OFDMA system signal peak-to-average power power ratio as claimed in claim 1, it is characterized in that, in described step (A3), all bits of each described subset of can reversing are mapped on the frequency domain symbol of the same time-domain symbol in same Resource Block；Each described OFDMA time-domain symbol comprises multiple frequency domain symbol set of reversing.
3. the method reducing OFDMA system signal peak-to-average power power ratio as claimed in claim 1 or 2, it is characterised in that in described step (A3), constructs frequency domain symbol set of can reversing in modulation and mapping process；
In described frequency domain symbol set of reversing, the sign bit of all symbols both is from one or more IS-LDPC and can reverse subset, and the one or more IS-LDPC can be mapped to the sign bit of described frequency domain symbol set of can reversing by all bits of concentrating of inverted rotor.
4. the method reducing OFDMA system signal peak-to-average power power ratio as claimed in claim 1 or 2, it is characterised in that described step (A4) is specific as follows:
(A4.1) frequency domain symbol set entirety of can reversing is multiplied by reversion factor p；
(A4.2) under each OFDMA time-domain symbol controls, undertaken reversing or nonreversible by the frequency domain symbol set of respectively can reversing that each described OFDMA time-domain symbol comprises, it is thus achieved that multiple candidate's OFDMA time-domain symbol；
And choose OFDMA time-domain symbol minimum for PAPR from described candidate's OFDMA time-domain symbol；OFDMA time-domain symbol minimum for described PAPR is carried out inverse fast Fourier transform process, it is thus achieved that send out the OFDMA signal sent.
5. the method reducing OFDMA system signal peak-to-average power power ratio as claimed in claim 1, it is characterised in that the decoding process in described step (B1) is specific as follows:
It is 0 by the phase bits assignment of the reversed subset corresponding to amplitude bit so that it is confidence level is infinitely great；And the phase bits of the reversed subset corresponding to described amplitude bit is participated in as known parameters the iterative decoding of other bits, it is thus achieved that code word
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| CN112165378A (en) * | 2020-09-01 | 2021-01-01 | 南京信息工程大学 | Low-PAPR high-safety optical access method with high resource utilization rate |
| CN112565152A (en) * | 2020-12-25 | 2021-03-26 | 重庆理工大学 | Peak-to-average power ratio reduction method and device for visible light communication OFDM system |
| WO2023024731A1 (en) * | 2021-08-27 | 2023-03-02 | 华为技术有限公司 | Method for reducing peak-to-average power ratio (papr), and communication apparatus |
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| CN108123742A (en) * | 2016-11-26 | 2018-06-05 | 华为技术有限公司 | A kind of data processing method, data sending device and data sink |
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| CN112565152A (en) * | 2020-12-25 | 2021-03-26 | 重庆理工大学 | Peak-to-average power ratio reduction method and device for visible light communication OFDM system |
| WO2023024731A1 (en) * | 2021-08-27 | 2023-03-02 | 华为技术有限公司 | Method for reducing peak-to-average power ratio (papr), and communication apparatus |
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