CN105743835B - A method of reducing OFDMA system signal peak-to-average power power ratio - Google Patents
A method of reducing OFDMA system signal peak-to-average power power ratio Download PDFInfo
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- CN105743835B CN105743835B CN201610239942.4A CN201610239942A CN105743835B CN 105743835 B CN105743835 B CN 105743835B CN 201610239942 A CN201610239942 A CN 201610239942A CN 105743835 B CN105743835 B CN 105743835B
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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
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
- H04L27/2617—Reduction thereof using coding using block codes
Abstract
The invention discloses a kind of method for reducing OFDMA system signal peak-to-average power power ratio, specifically: in transmitting terminal, the data of user's input are encoded by LDPC encoder, generation possesses multiple coding codewords for inverting subset, then is modulated；Modulated data are mapped on the subcarrier that user is assigned to, construction is multiple to invert frequency domain symbol set；Independent reversion is carried out by the frequency domain symbol set that inverts to construction to reduce the peak-to-average power ratio of OFDMA system signal；In receiving end, subcarrier demapping and demodulation are carried out after the signal received is fourier transformed again, the corresponding reception information of each user is obtained, and is decoded using ldpc decoder, extracts phasing back information from obtained code word to restore raw information；The present invention can be effectively reduced the peak-to-average power ratio of OFDMA system signal, and no need to send side informations, improve the availability of frequency spectrum of system, reduce the complexity of system, while having good error-correcting performance.
Description
Technical field
The invention belongs to signal processing technology fields, more particularly, to a kind of reduction OFDMA system signal peak-to-average power power
The method of ratio.
Background technique
A kind of extension of orthogonal frequency division multiple access (OFDMA) technology as orthogonal frequency division multiplexing (OFDM) technology, is answered extensively
For in system of broadband wireless communication.But its signal of communication peak value with higher and average power ratio, i.e. peak-to-average power ratio
(PAPR).Higher PAPR requires the radio-frequency front-end in communication system, such as power amplifier, digital analog converter with wider
Linear dynamic range.The cost that will lead to base station and terminal if using the radio-frequency front-end of broad linear dynamic range is increased
Add；It will lead to inband signaling distortion and out of band spectrum leakage if using the radio-frequency front-end of relatively narrow linear dynamic range, cause
Communication system performance declines to a great extent.
There are the technical solution of many PAPR for reducing ofdm signal, such as selective mapping (SLM), portion in the prior art
Divide transmission serial method (PTS) and the scheme based on coding；Although wherein SLM and PTS method can be significant reduce OFDM letter
Number PAPR, but need to be sent to receiving end using phase rotation coefficient used by transmitting terminal as side information, this can lead
It causes system data transmission rate to decline and increases system complexity.
Notification number, which proposes one kind for the Chinese patent of CN102624665B, reduces ofdm signal based on NS-LDPC code
The method of PAPR, this method use a kind of LDPC code of special construction, can effectively reduce ofdm signal PAPR, and hardly to being
System bit error rate performance and system data transmission rate impact；But this method more lays particular emphasis on NS-LDPC code book body, and
The application that only considered single user scene decline low signal PAPR does not have not for the multi-user scene in OFDMA system yet
Its codeword structure, specific modulation system are adapted to the subcarrier maps in OFDMA system.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of reduction OFDMA system signal peaks
The method of equal power ratio, the function of reducing peak-to-average power ratio is realized using IS-LDPC code, transmission side information is not needed, aobvious
Writing has good error-correcting performance while reducing OFDMA system signal PAPR.
To achieve the above object, according to one aspect of the present invention, it is equal to provide a kind of reduction OFDMA system signal peak
The method of power ratio, the processing of processing and receiving end including transmitting terminal；
The processing of its transmitting terminal includes the following steps:
(A1) it is encoded according to information data of the check matrix H of IS-LDPC code to user, generation possesses U can be anti-
The IS-LDPC code word A=[A of rotor collection0,A1,…,AU]；
Wherein Au(u=1,2 ..., U) indicates to invert subset u-th, each can inverted rotor to be concentrated with a bit be phase
Position bit, phase bits are fixed as 0, A in coding0The U remaining bits that can invert subset are not belonging in presentation code bit
Set；
(A2) running time-frequency resource in each resource block duration in OFDMA system is divided, and will divided
Resource block distribute to multiple users；
(A3) PSK/QAM modulation is carried out to the coding codeword of each user, and modulated symbol is mapped to user's money
On the subcarrier of source block, construction can invert frequency domain symbol set, obtain OFDMA time-domain symbol；
(A4) reversion processing is carried out to each frequency domain symbol set that inverts in each OFDMA time-domain symbol, obtains multiple times
OFDMA time-domain symbol is selected, the smallest OFDMA time-domain symbol of PAPR is therefrom selected, inverse fast Fourier transform is carried out to it, is obtained
Send out the OFDMA signal sent；
The processing of its receiving end includes the following steps:
(B1) Fast Fourier Transform (FFT), subcarrier demapping and demodulation are carried out to the signal received, and according to transmission
The resource block distribution condition at end obtains reception information corresponding to each user, is then decoded, is obtained using ldpc decoder
Obtain code word
(B2) position of phase bits when being encoded according to transmitting terminal, the code word obtained from decodingMiddle extraction U can invert
The inversion information of subset obtains phase bits vector b=[b1,b2,…,bU],
Wherein bu∈ { 0,1 } (u=1,2 ..., U)；
(B3) by the U phase bits and code word in vector bIn U can invert subset and carry out xor operation respectively,
And then restore original code word A:
Wherein NuIndicate each can inverted rotor concentrate bit number；For binary coding, reverse turn operation is equivalent
In by can bit corresponding with the subset phase bits progress exclusive or concentrated of inverted rotor.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, step (A2) are specific as follows:
(A2.1) running time-frequency resource in each resource block duration in OFDMA system is divided into multiple mutually disjoint
Resource block, each resource block occupies NRBA subcarrier in frequency domain and KRBA time-domain symbol length；
(A2.2) according to proportional fair scheduling, ready-portioned resource block is distributed into multiple users；It is each in guarantee
While the transmission rate fair relatively of user, total system transfer rate is improved；
When the data of different user are transmitted by mutually independent frequency-selective channel, all users are in some frequency
The all very poor probability of channel response on rate point can very little, at this time if the subcarrier is distributed to the preferable user of channel condition
It is transmitted, other subcarriers are also to improve the transmission rate of system, therefore need in this way, multi-user diversity gain can be generated
Certain resource allocation policy is followed, ready-portioned resource block is distributed into multiple users；
Proportional fair scheduling (P.Viswanath, D.N.C.Tse, and R.Laroia, " can be used
Opportunistic beamforming using dumb antennas,"IEEE Transactions on
Information Theory, vol.48, no.6, pp.1277-1294, Jun 2002), in the transmission speed for guaranteeing each user
While rate fair relatively, system transfer rate is improved.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio in step (A3), can each invert
On the frequency domain symbol of the same time-domain symbol of all bit maps of subset into the same resource block；Each OFDMA time domain
Symbol, which contains, multiple inverts frequency domain symbol set.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio in step (A3), modulates mapping
Key is: construction can invert frequency domain symbol set in modulation mapping process；
The sign bit that all symbols in frequency domain symbol set can be inverted, which both is from one or more IS-LDPC, to be inverted
Subset, and the one or more IS-LDPC can all bits for concentrating of inverted rotor be mapped to the symbol of the frequency domain symbol set
Bit.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, step (A4) are specific as follows:
(A4.1) for that can invert frequency domain symbol set, entirety is multiplied by reversion factor p；
The value collection of the reversion factor is combined into { 1, -1 }, and p indicates nonreversible when being 1, and reversion is indicated when p is -1；For QAM tune
Mode processed only has partial bit in bit set corresponding to the QAM symbol when some qam symbol is multiplied by the reversion factor -1
It can invert, and other bits then remain unchanged, and the bit inverted is known as " sign bit ", the bit not inverted
Referred to as " amplitude bit ", the reversion refer to that bit 0 becomes bit 1 or bit 1 and becomes bit 0；
(A4.2) its each reversion for inverting frequency domain symbol set that is included of each OFDMA time-domain symbol independent control with
It is no；Multiple candidate's OFDMA time-domain symbols are obtained, the smallest OFDMA time-domain symbol of PAPR is therefrom selected, it is inverse by fast Fourier
The OFDMA signal sent is sent out in transformation, acquisition.
Preferably, the method for above-mentioned reduction OFDMA system signal peak-to-average power power ratio, the decoding process in step (B1)
It is specific as follows:
The phase bits for inverting subset corresponding to amplitude bit are assigned a value of 0, keep its confidence level infinitely great；And it will
The phase bits that subset is inverted corresponding to amplitude bit participate in the iterative decoding of other bits as known results, are translated
Code code word
Since the known phase bits that can each invert subset are fixed as 0 when coding, and to frequency domain symbol
During set carries out reverse turn operation, the amplitude bit of each frequency domain symbol is remained unchanged, i.e., can corresponding to amplitude bit
It is 0 that the phase bits of reversion subset, which still maintain, therefore during receiving end uses LDPC iterative decoding, can be directly by width
The phase bits that subset is inverted corresponding to degree bit are assigned a value of 0, and the iteration of other bits is participated in as known results
Decoding.
The method provided by the invention for reducing OFDMA system signal peak-to-average power power ratio passes through user data in transmitting terminal
IS-LDPC encoder coding, generating has multiple coding codewords for inverting subset；PSK/QAM modulation is carried out again, then will be adjusted
Symbol processed maps on the subcarrier that user is assigned to, and construction is multiple to invert frequency domain symbol set；By to construction can be anti-
Turn the independent reversion of frequency domain symbol set progress in the process, to be not required to reduce the peak-to-average power ratio of OFDMA system signal
Send phasing back information；
Carry out subcarrier demapping and PSK/QAM demodulation again in receiving end, after the signal received is fourier transformed
System, is obtained the corresponding reception information of each user, is then decoded using ldpc decoder, mentioned from obtained code word
Raw information can correctly be restored after taking out phasing back information.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) method provided by the invention for reducing OFDMA system signal PAPR is significantly reducing the same of system signal PAPR
When, transmission side information is not needed, the availability of frequency spectrum of system is improved, reduces the complexity of system, and possess and mark
Quasi- LDPC encodes essentially identical error-correcting performance；
(2) method provided by the invention for reducing OFDMA system signal PAPR, for the multi-user in OFDMA system
Scape, i.e., the scene that multiple users are communicated simultaneously on different subcarriers can invert frequency domain symbol collection using independent reversion
The method of conjunction reduces signal PAPR, and provides the make that can invert frequency domain symbol set；
The running time-frequency resource of OFDMA system is divided into mutually disjoint resource block first, each resource block occupies NRBA frequency
Domain subcarrier and KRBA time-domain symbol length；Then the distribution of resource block is carried out to multi-user according to resource allocation policy；It ties again
Specific modulation, such as QPSK modulation or 16QAM modulation are closed, using suitable subcarrier maps mode, by multi-user's
It inverts subset corresponding to IS-LDPC code to be mapped on corresponding resource block, frequency domain symbol set can be inverted by constructing with this, be made
The sign bit of all symbols, which both is from one or more IS-LDPC, in must gathering can invert subset, and the one or more IS-
LDPC can inverted rotor concentrate all bits be mapped on the sign bit of the frequency domain symbol set, and then keep multi-user
Data transmit independence；
In comparison, the prior art that Publication No. CN102624665B Chinese patent provides lays particular emphasis on NS-LDPC code
Itself only consider the application of single user scene decline low signal PAPR, i.e., at any one time, the data on all subcarriers are come
From in the scene of the same user, not providing under multi-user scene by the solution for inverting subset and being mapped on subcarrier in code word
Certainly scheme.
Detailed description of the invention
Fig. 1 is that the resource block of OFDMA system in the embodiment of the present invention divides；
Fig. 2 is " OFDMA time-domain symbol " in the embodiment of the present invention, " time-domain symbol of resource block " and " frequency domain symbol "
Schematic diagram；
Fig. 3 is subcarrier maps, reverse turn operation and the inverse Fourier transform that the embodiment of the present invention is carried out in transmitting terminal
(IFFT) structural block diagram；
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
In embodiment, the running time-frequency resource of OFDMA system is divided into multiple resource blocks, as shown in Figure 1, each resource block accounts for
There are a certain number of subcarrier in frequency domain and certain time-domain symbol length, wherein the duration of each resource block is denoted as
time-slot；For user i, it is assigned to a resource block in each time-slot, and each resource block occupies NRB
A subcarrier in frequency domain and KRBA 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, and 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 knot
Structure:
(1) there are IS-LDPC code U can invert subset, and not have intersection between these subsets；By some of LDPC code
The set composition of coded-bit can invert subset, wherein U >=1；
(2) can each invert has a bit in the coded-bit set of subset be phase bits, and phase bits are encoding
When be fixed as 0, if subset can be inverted by having inverted some, corresponding phase bits become 1；
(3) can each invert subset can independently be inverted, and at the same time reversion it is one or more can inverted rotor concentrate
The new code word obtained after coded-bit is still effective code word；Wherein, reversion, which refers to, becomes bit 1 for bit 0, or by bit
1 becomes bit 0；
Due to respectively can inverted rotor to be concentrated with a bit be phase bits, and be fixed as 0 in coding；If to IS-LDPC
Some in code can invert subset and carry out reverse turn operation, then its corresponding phase bits becomes 1；If not to IS-LDPC
Some in code can invert subset progress reverse turn operation, then its corresponding phase bits is still 0；Therefore the phase bits are used for
It is corresponding in instruction IS-LDPC code to invert whether subset is inverted, in the phase bits that receiving end is obtained using decoding
Know each inversion information for inverting subset, thus judge its it is corresponding invert whether subset is inverted, Jin Erzheng
Really restore raw information.
OFDMA time-domain symbol, the time-domain symbol of resource block and frequency domain symbol in embodiment is as shown in Fig. 2, frequency domain
Symbol indicates the PSK/QAM modulation symbol on each subcarrier；The time-domain symbol of resource block is indicated in an OFDMA time-domain symbol
Duration in, the frequency domain symbol set on the subcarrier of each resource block.
In embodiment, subcarrier maps, the structural frames of reverse turn operation and inverse Fourier transform (IFFT) are carried out in transmitting terminal
Figure is as shown in figure 3, include the processing of frequency domain and time domain.
The method for the reduction OFDMA system signal PAPR that embodiment provides, specific as follows:
(1) coding step: encoding according to information data of the check matrix H of IS-LDPC code to user, generation is gathered around
There are the U IS-LDPC code word A=[A that can invert subset0,A1,…,AU], wherein Au(u=1,2 ..., U) is indicated can inverted rotor
Collection, each can inverted rotor to be concentrated with a bit be phase bits, phase bits are fixed as 0, A in coding0Presentation code ratio
U are not belonging in spy can invert the set of remaining bits of subset.
(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, each resource block occupy NRBA subcarrier in frequency domain and KRBA time-domain symbol length；
(2.2) according to Proportional Fair principle, the resource block of division is distributed into multiple users and is carried out data transmission,
While guaranteeing each user's transmission rate fair relatively, total system transfer rate is improved.
(3) modulation, subcarrier maps step:
PSK/QAM modulation is carried out to the coding codeword of each user；And modulated symbol is mapped to user resources block
Subcarrier on, construction can invert frequency domain symbol set；
Wherein, all bits that can each invert subset will be mapped to the same time-domain symbol in the same resource block
On frequency domain symbol；
By the step, each OFDMA time-domain symbol X is obtained, wherein X is each OFDMA time-domain symbol duration
Frequency domain symbol set that is interior, being transmitted on subcarrier.
(4) reversion, sending step:
It is whole multiplied by reversion factor p that frequency domain symbol set can be inverted, obtain multiple candidate's OFDMA time-domain symbols, therefrom
The smallest OFDMA time-domain symbol of PAPR is selected, inverse fast Fourier transform is carried out to it, the OFDMA signal sent is sent out in acquisition；
In embodiment, the value collection for inverting the factor is combined into { 1, -1 }, and p indicates nonreversible when being 1, indicates anti-when p is -1
Turn；
Specific step is as follows to reduce signal PAPR for independent reversion frequency domain symbol set:
(4.1) number that frequency domain symbol set can be inverted in each OFDMA time-domain symbol is M, is denoted as X(1),X(2),…,
X(M)；Frequency domain symbol set X is inverted to each(m)Multiplied by phasing back factor pm, obtain treated OFDMA time domain symbol
Number
By traversing the M all possible value of the phasing back factor, raw 2 are generatedMThe different OFDMA time-domain symbol of kind, i.e.,
Candidate OFDMA time-domain symbol；
Wherein, pmValue collection is combined into { 1, -1 }；
(4.2) from above-mentioned 2MThe smallest OFDMA time-domain symbol of PAPR is selected in kind candidate's OFDMA time-domain symbol, through too fast
The OFDMA signal sent is sent out in fast inverse Fourier transform, acquisition.
(5) reception, subcarrier demapping, demodulation, decoding procedure:
Receiving end carries out Fast Fourier Transform (FFT), subcarrier demapping and PSK/QAM to the signal received and demodulates,
And according to the resource allocation result of transmitting terminal, reception information corresponding to each user is obtained；
Docking is collected mail to cease and be decoded using ldpc decoder, during iterative decoding, directly by amplitude bit institute
The corresponding phase bits for inverting subset are assigned a value of 0, keep its confidence level infinitely great, participate in other bits as known results
Iterative decoding, obtain code word
(6) phasing back information is extracted:
According to the position of the phase bits when transmitting terminal encodes, from code wordMiddle extraction U can invert the anti-of subset
Transfering the letter breath, obtains phase bits vector b=[b1,b2,…,bU], wherein
bu∈ { 0,1 } (u=1,2 ..., U)；
(7) restore raw information:
By the U phase bits and code word in vector bIn U can invert subset and carry out xor operation respectively,
Recover original code word A:
Wherein NuIndicate each can inverted rotor concentrate bit number.
In embodiment, it is specific as follows to be related to parameter:
Consider that downlink OFDMA system, data subcarrier number are NDL=720, each resource block occupies 24 frequency domain and carries
Wave and 2 time-domain symbol length have 720/24=30 resource block in each time-slot, and in each resource block when
Frequency domain symbol set corresponding to the symbol of domain is that can invert frequency domain symbol set, i.e. M=30；
Using two kinds of modulation systems of gray mappings QPSK and 16QAM；The code rate of IS-LDPC code is 0.5, code length N=
1056, subset can be inverted comprising 22, can each invert subset has 48 coded-bits, i.e. Nu=48, last in subset
For a bit as phase bits, when coding, is fixed as 0；Ldpc code decoder iterative decoding number is 500 times；For the side PTS
Method, packet count W=30, phase rotation coefficient value collection are combined into { -1,1 }.
Simulation result is shown: on the basis of not transmitted sideband information, the present invention reduces OFDMA system with using PTS method
The effect of signal PAPR is just the same, can reach the identical effect for reducing OFDMA signal peak-to-average power power ratio.
It is provided by the invention to reduce OFDMA system signal PAPR's for awgn channel and frequency selective fading channels
Method, on the basis of not transmitted sideband information, obtained frame error rate result and use PTS method and LDPC is encoded, and false
If it is essentially identical that recipient is properly received the frame error rate result obtained when side information completely.
Under the conditions of frequency selective fading channels (ITU-R M.1225 in vehicular channel A), as packet count W=30,
It is 10 in frame error rate when using QPSK modulation system-2Place, the present invention not transmitted sideband information when need Signal to Noise Ratio (SNR)=
6.3dB, recipient are properly received the Signal to Noise Ratio (SNR)=6.25dB needed when side information completely；As it can be seen that the present invention can receive
Side information is restored at end well, i.e., each inversion information for inverting subset will not so as to avoid the transmission of side information
System data transmission rate is caused to decline because of transmitted sideband information；The complexity of system is greatly reduced, and is possessed good
Error-correcting performance.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of method for reducing OFDMA system signal peak-to-average power power ratio, the processing of processing and receiving end including transmitting terminal,
It is characterized in that,
The processing of the transmitting terminal includes the following steps:
(A1) it is encoded according to information data of the check matrix H of IS-LDPC code to user, generating has U is a can inverted rotor
The IS-LDPC code word A of collection；Each phase bits inverted in subset are set to 0；
(A2) running time-frequency resource in each resource block duration in OFDMA system is divided, and acquisition will be divided
Resource block distributes to user；
(A3) coding codeword of each user is modulated, modulated symbol is mapped on the subcarrier of user resources block；
And frequency domain symbol set can be inverted by construction, obtain OFDMA time-domain symbol；
Each frequency domain symbol that can invert same time-domain symbol of all bit maps of subset into the same resource block
On number；Each OFDMA time-domain symbol inverts frequency domain symbol set comprising multiple；
Construction can invert frequency domain symbol set in modulation and mapping process；It is described to invert all symbols in frequency domain symbol set
Sign bit both be from one or more IS-LDPC and can invert subset, and one or more of IS-LDPC can invert subset
In all bits be mapped to the sign bit that can invert frequency domain symbol set；
The running time-frequency resource of OFDMA system is divided into mutually disjoint resource block first, each resource block occupies NRBA frequency domain
Carrier wave and KRBA time-domain symbol length；Then the distribution of resource block is carried out to multi-user according to resource allocation policy；In conjunction with tool
The modulation of body, such as QPSK modulation or 16QAM modulation, using suitable subcarrier maps mode, by the IS-LDPC of multi-user
The subset that inverts corresponding to code is mapped on corresponding resource block, and frequency domain symbol set can be inverted by being constructed with this, so that set
In the sign bits of all symbols both be from one or more IS-LDPC and can invert subset, and the one or more IS-LDPC can
All bits that inverted rotor is concentrated are mapped on the sign bit of the frequency domain symbol set, and then keep the data of multi-user
Transmit independence；
(A4) reversion processing is carried out to the frequency domain symbol set that inverts in each OFDMA time-domain symbol, obtains multiple candidate OFDMA
Time-domain symbol；The smallest OFDMA time-domain symbol of PAPR is selected from candidate's OFDMA time-domain symbol, and it is carried out quickly
The OFDMA signal sent is sent out in inverse Fourier transform, acquisition；
The processing of the receiving end includes the following steps:
(B1) Fast Fourier Transform (FFT), subcarrier demapping and demodulation are carried out to the signal received, and according to transmitting terminal
Resource block distribution condition obtains reception information corresponding to each user；And decoded using ldpc decoder, it is decoded
Code word
(B2) according to the position where phase bits, from the code wordIt is middle to extract the U inversion informations that invert subset,
Obtain phase bits vector b；
(B3) by the U phase bits and code word in the phase bits vector bIn U can invert subset respectively into
Row xor operation recovers original code word A.
2. reducing the method for OFDMA system signal peak-to-average power power ratio as described in claim 1, which is characterized in that the step
(A4) specific as follows:
(A4.1) it is whole multiplied by reversion factor p that frequency domain symbol set can be inverted；
(A4.2) under the control of each OFDMA time-domain symbol, each frequency domain is inverted for what each OFDMA time-domain symbol was included
Assemble of symbol carries out reversion or nonreversible, obtains multiple candidate's OFDMA time-domain symbols；
And the smallest OFDMA time-domain symbol of PAPR is chosen from candidate's OFDMA time-domain symbol；It is the smallest to the PAPR
OFDMA time-domain symbol carries out inverse fast Fourier transform processing, and the OFDMA signal sent is sent out in acquisition.
3. reducing the method for OFDMA system signal peak-to-average power power ratio as described in claim 1, which is characterized in that the step
(B1) the decoding process in is specific as follows:
The phase bits for inverting subset corresponding to amplitude bit are assigned a value of 0, keep its confidence level infinitely great；And it will be described
The phase bits that subset is inverted corresponding to amplitude bit participate in the iterative decoding of other bits as known parameters, are translated
Code code word
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| CN108123742B (en) * | 2016-11-26 | 2021-10-26 | 华为技术有限公司 | Data processing method, data transmitting device and data receiving device |
| CN108282245B (en) * | 2017-01-05 | 2020-06-16 | 华为技术有限公司 | LDPC coding and decoding method and device |
| CN109995692A (en) * | 2017-12-30 | 2019-07-09 | 华为技术有限公司 | Send the method and device of data |
| CN112165378B (en) * | 2020-09-01 | 2023-01-17 | 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 |
| CN115913854A (en) * | 2021-08-27 | 2023-04-04 | 华为技术有限公司 | Method for reducing peak-to-average power ratio (PAPR) and communication device |
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| CN101778071A (en) * | 2010-01-29 | 2010-07-14 | 华中科技大学 | Method for reducing peak-to-average power ratio of OFDM signal |
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| CN102916923A (en) * | 2012-10-11 | 2013-02-06 | 华中科技大学 | Information transmission method capable of reducing PAPR of multicarrier system |
| CN103595681A (en) * | 2013-11-01 | 2014-02-19 | 华中科技大学 | Method for lowering PAPR of multi-carrier communication signal |
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| CN101778071A (en) * | 2010-01-29 | 2010-07-14 | 华中科技大学 | Method for reducing peak-to-average power ratio of OFDM signal |
| CN102624665A (en) * | 2012-03-02 | 2012-08-01 | 华中科技大学 | Method for reducing peak to average power ratio (PAPR) of multi-carrier communication signals |
| CN102916923A (en) * | 2012-10-11 | 2013-02-06 | 华中科技大学 | Information transmission method capable of reducing PAPR of multicarrier system |
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