CN114978845B - Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation - Google Patents
Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation Download PDFInfo
- Publication number
- CN114978845B CN114978845B CN202210617715.6A CN202210617715A CN114978845B CN 114978845 B CN114978845 B CN 114978845B CN 202210617715 A CN202210617715 A CN 202210617715A CN 114978845 B CN114978845 B CN 114978845B
- Authority
- CN
- China
- Prior art keywords
- peak
- signal
- modulation
- average ratio
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- H04L27/2627—Modulators
-
- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Error Detection And Correction (AREA)
Abstract
The invention relates to the field of communication, in particular to a peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation. The invention carries out interleaving modulation by segmenting and phase splitting by the data signal, suppresses peak-to-average ratio by multiphase interleaving modulation, generates a phase factor sequence by utilizing the variable length orthogonal factor, and effectively reduces the receiving complexity at the receiving end. Meanwhile, by utilizing the rotatable characteristic of quadrature amplitude modulation, the data information and the auxiliary information can be transmitted together under the condition that no auxiliary information occupies extra bandwidth. Therefore, OFDM peak-to-average ratio inhibition can be well carried out, and a new method is provided for peak-to-average ratio inhibition without additional auxiliary information transmission and with low complexity.
Description
Technical Field
The invention relates to the field of communication, in particular to a peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation.
Background
Today in the field of communications. The coding is now usually performed using an interleaved modulation method, the key idea of which is to scramble the modulated data generation with an interleaver, which functions to reset the order of bits in the information sequence. When the weight of the code word output by the information sequence after being encoded by the first component encoder is lower, the interleaver enables the interleaved information sequence to be encoded by the second component encoder and then output high-repetition code words, so that the free distance of the code word is increased, and meanwhile, the good interleaver can effectively reduce the correlation between check sequences.
And the power between satellite and ground communication is limited by the problem of too high peak-to-average power ratio (PAPR) of OFDM, so that the method cannot be widely applied. Classified according to the technical approach of OFDM peak-to-average ratio suppression, three categories can be broadly distinguished: signal predistortion algorithms, coding class algorithms, and probability class algorithms. This probabilistic class of algorithms will be briefly described below.
The basic principle of the probability algorithm is to introduce a certain correlation among subcarriers, so that the probability of occurrence of a high peak of the superimposed signal is reduced to a certain extent. Typical probability class algorithms include SLM selection mapping, partial transmission sequence, subcarrier injection, subcarrier reservation, etc., but still require the addition of additional signals during transmission, increasing transmission bandwidth occupation.
Therefore, the invention provides a novel peak-to-average ratio suppression method and equipment on the premise that:
(1) The power peak-to-average ratio PAPR is defined as:
(2) The range of the values of the known phase factors of the receiving end and the transmitting side;
(3) In the detection process, the receiving end knows the length of the transmitted signal and the length of the interleaving sequence and the adopted sequence;
(4) The problem that the constellation diagram rotates due to frequency deviation and time delay caused by the channel is not considered in the invention, and the signal has completed the correction of the frequency deviation and the time delay at the receiving end.
Disclosure of Invention
The invention aims to solve the problem of over-high peak-to-average ratio of a satellite-to-ground communication scheme in the prior art and provides a peak-to-average ratio inhibition method and equipment based on multiphase interleaving modulation.
In order to achieve the above object, the present invention provides the following technical solutions:
a peak-to-average ratio suppression method based on multiphase interleaved modulation comprises the following steps:
transmitting end:
s1: modulating the transmission data to obtain a plurality of modulation symbols; the modulation processing comprises segmentation, error correction, interleaving and constellation mapping;
s2: multiplying the modulation symbol with the corresponding phase factor, and outputting a transmission symbol;
s3: sequentially superposing the transmission symbols, outputting a transmission signal and transmitting the transmission signal;
the receiving end:
s4: receiving the transmitting signal, and demodulating the transmitting signal to a time domain to obtain a demodulated signal;
s5: initializing an estimated value of a decoder, sending the function and the demodulation signal into a basic signal estimator for iteration, and outputting an expected value of the decoder after iteration;
s6: and carrying out soft decision on the expected value of the decoder according to a modulation mode, wherein a soft decision result is the expected value of the decoder, and outputting the soft decision result. The invention carries out interleaving modulation by segmenting and phase splitting by the data signal, suppresses peak-to-average ratio by multiphase interleaving modulation, generates a phase factor sequence by utilizing the variable length orthogonal factor, and effectively reduces the receiving complexity at the receiving end. Meanwhile, by utilizing the rotatable characteristic of quadrature amplitude modulation, the data information and the auxiliary information can be transmitted together under the condition that no auxiliary information occupies extra bandwidth. Therefore, OFDM peak-to-average ratio inhibition can be well carried out, and a new method is provided for peak-to-average ratio inhibition without additional auxiliary information transmission and with low complexity.
As a preferred embodiment of the present invention, the step S1 includes:
s11: dividing the transmission data frame by frame, and dividing the transmission data of each frame into U data segments equally in sequence; wherein U is a preset natural number;
s12: sequentially performing error correction coding on the data segments and outputting error correction data segments;
s13: interleaving the error correction data segments with corresponding interleavers in sequence, and outputting interleaved data segments; the interleaver is a preset sequence of cyclic shift;
s14: and performing constellation mapping processing on the interleaved data segment and outputting a modulation symbol.
As a preferred embodiment of the present invention, the phase factor has the following formula:
wherein ρ is k,l For the phase factor, p, of the kth data segment of the first frame k,l Is the transmission power, θ, of the data segment k,l As the phase offset, θ k,l ＝(k-1)π/2U。
As a preferred embodiment of the present invention, the error correction coding rate r=n/M in step S12, where N is the number of bits of each data segment, and M is the number of bits of each data segment after coding.
As a preferred embodiment of the present invention, the displacement of the adjacent interleavers in the step S13 is M/(UL).
As a preferred embodiment of the present invention, the constellation mapping process in the step S14 is BPSK constellation mapping.
As a preferred embodiment of the present invention, the step S5 includes the steps of:
s51: initializing decoder estimation functionsThe number of iterations t=0; wherein l is a frame number, k is a data segment number, and n is a transmission symbol number;
s52: calculation ofLog-likelihood ratio>And the log likelihood ratio +.>Input to a deinterleaver;
s53: transmitting the output result of the de-interleaver to an error correction coder decoder to obtain a decoding result
S54: the result of the coding is processedIs sent to an interleaver, and the estimated value of the decoder is output +.>The iteration number t=t+1;
s55: judging whether the iteration times t are equal to a preset maximum iteration times or not, if so, entering step S52; if the number of iterations is equal to the preset maximum number of iterations, outputting Is the expected value of the decoder.
As a preferable embodiment of the present invention, the log likelihood ratio in the step S52The calculation formula of (2) is as follows:
wherein r is n For the demodulated signal, wherein E (& gt) and Var (& gt) represent a desired value function and a variance function, respectively,representing the interference experienced by the kth data segment of the first frame.
A peak-to-average ratio suppression device comprising at least one processor, a signal transmitter, a signal receiver, and a memory communicatively coupled to the at least one processor; the signal transmitter is capable of transmitting a data signal and the signal receiver is capable of receiving the data signal; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of the preceding claims.
Compared with the prior art, the invention has the beneficial effects that:
the invention carries out interleaving modulation by segmenting and phase splitting by the data signal, suppresses peak-to-average ratio by multiphase interleaving modulation, generates a phase factor sequence by utilizing the variable length orthogonal factor, and effectively reduces the receiving complexity at the receiving end. Meanwhile, by utilizing the rotatable characteristic of quadrature amplitude modulation, the data information and the auxiliary information can be transmitted together under the condition that no auxiliary information occupies extra bandwidth. Therefore, OFDM peak-to-average ratio inhibition can be well carried out, and a new method is provided for peak-to-average ratio inhibition without additional auxiliary information transmission and with low complexity.
Drawings
Fig. 1 is a flow chart of a peak-to-average ratio suppression method based on multiphase interleaved modulation according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram showing the performance comparison of different frame numbers and data segment numbers in a peak-to-average ratio suppression method based on multiphase interleaved modulation according to embodiment 3 of the present invention;
fig. 3 is a schematic diagram of a peak-to-average ratio suppressing apparatus according to embodiment 4 of the present invention using a peak-to-average ratio suppressing method based on multiphase interleaved modulation according to any one of embodiment 1 or embodiment 2.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
A peak-to-average ratio suppression method based on multiphase interleaved modulation comprises the following steps:
transmitting end:
s1: modulating the transmission data to obtain a plurality of modulation symbols; the modulation process includes segmentation, error correction, interleaving, and constellation mapping.
S2: and multiplying the modulation symbols by the corresponding phase factors, and outputting transmission symbols.
S3: and sequentially superposing the transmission symbols, outputting a transmission signal and transmitting.
The receiving end:
s4: and receiving the transmitting signal, and demodulating the transmitting signal to a time domain to obtain a demodulated signal.
S5: initializing the estimated value of the decoder, sending the function and the demodulation signal into a basic signal estimator for iteration, and outputting the estimated value of the decoder after iteration.
S6: and carrying out soft decision on the expected value of the decoder according to a modulation mode, wherein a soft decision result is the expected value of the decoder, and outputting the soft decision result.
Example 2
This embodiment is further described in embodiment 1, where the number of frames of the transmission data is L, the data segment of each frame is U, the number of bits of each data segment is N, and the information bit of the kth data segment of the first frame is The processing steps of the transmission data are specifically as follows:
transmitting end:
s1: modulating the transmission data to obtain a plurality of modulation symbols;
s11: dividing the transmission data frame by frame, and dividing the transmission data of each frame into U data segments equally in sequence; wherein U is a preset natural number;
s12: sequentially performing error correction coding on the data segments and outputting error correction data segments;
the code rate R=N/M of the error correction coding, and the error correction data segment after coding
Where N is the number of bits per data segment and M is the number of bits per data segment after encoding.
S13: interleaving the error correction data segments with corresponding interleavers in turn to output interleaved data segments
The interleaver is a preset sequence of cyclic shift; the displacement of adjacent interleavers is M/(UL). I.e. the interleaver is preset to pi k,l The latter interleaver pi k+1,l Is an interleaver pi k,l And (3) a sequence obtained after the M/(UL) bit is circularly shifted.
S14: and performing constellation mapping processing on the interleaved data segment and outputting a modulation symbol.
Wherein, the invention adopts BPSK constellation mapping at this time, and outputs modulation symbols as follows
S2: associating the modulation symbols with their counterpartsIs multiplied by the phase factor of (a) to output a transmission symbol x k,l ·ρ k,l ；
The calculation formula of the phase factor is as follows:
wherein ρ is k,l For the phase factor, p, of the kth data segment of the first frame k,l Is the transmission power, θ, of the data segment k,l As the phase offset, θ k,l ＝(k-1)π/2U。
S3: sequentially superposing the transmission symbols to obtain a plurality of data segment transmission symbolsAlso a plurality of frames are superimposed to get +.>Outputting the superimposed transmission symbols as transmission signals and transmitting the transmission signals;
the receiving end:
s4: and receiving the transmitting signal, and demodulating the transmitting signal to a time domain to obtain a demodulated signal. In which the signal r is demodulated n The expression of (2) is:
h is the channel coefficient, ω n Is the variance sigma ω Is a complex gaussian white noise signal after DFT, n=0, 1,...
S5: initializing an estimated value of a decoder, sending the function and the demodulation signal into a basic signal estimator for iteration, and outputting the estimated value of the decoder after iteration;
s51: initializing decoder estimation functionsThe number of iterations t=0; wherein l is a frame number, k is a data segment number, and n is a transmission symbol number;
s52: calculation ofLog-likelihood ratio>And the log likelihood ratio +.>Input to a deinterleaver; said log-likelihood ratio->The calculation formula of (2) is as follows:
wherein r is n For the demodulated signal.
S53: transmitting the output result of the de-interleaver to an error correction coder decoder to obtain a decoding result
S54: the result of the coding is processedIs sent to an interleaver, and the estimated value of the decoder is output +.>The iteration number t=t+1;
s55: judging whether the iteration times t are equal to a preset maximum iteration times or not, if so, entering step S52; if the number of iterations is equal to the preset maximum number of iterations, outputting Is the expected value of the decoder.
S6: and carrying out soft decision on the expected value of the decoder according to a modulation mode, wherein a soft decision result is the expected value of the decoder, and outputting the soft decision result.
Example 3
This example is a practical application of the method described in example 2. This embodiment uses a burst of 1024 bits long transmission data,
s1: the transmission data is subjected to division processing with the number of frames l=2 and the number of data segments u=2. The phase value theta=0, pi/4 after error correction coding, pairLDPC encoding of R=1/5 code rate is carried out on data to obtain error correction data segment c k,l A total of 5120 modulation symbols. Each segment randomly generates an interleaving sequence of length 1280 according to the length of the transmission symbol, and the interleaving sequence is cyclically shifted so as to generate l×u=4 different interleaving sequences.
For the error correction data segment c k,l Sequence interleaving is carried out with each group of interleaving sequences to obtain 4 groups of interleaving data segments d with phase change k,l Codeword d k,l Mapping to BPSK constellation, obtaining modulation symbol x k,l 。
S2: the phase factor of each data segment of the modulation symbol isFinally, multiplying each data segment phase factor by the modulation symbol to obtain a transmission symbol x k,l ·ρ k,l 。
S3: superposition of multiple transmission symbols to obtainAlso a plurality of frames are superimposed to get +.>And performing M-point IFFT on the signal to obtain a transmitting signal, and transmitting the time domain transmission symbol.
S4: the transmission channel is an additive Gaussian white noise channel, the signal-to-noise ratio is 10dB, and the receiving end receives the symbols and then carries out M-point FFT on the signals to obtain a transmission sequence.
S5: the basic signal estimator is initialized and the decoding iteration is started. First iterationFeeding the signal into a basic signal estimator to obtain +.>Log-likelihood ratio>The receiving end knows the interleaving sequence group used by the sending end, and de-interleaves each phase factor, interleaving sequence and transmission sequence to obtain de-interleaving sequence. Decoding iteration is carried out on the de-interleaving sequence to obtain a decoding result +.>Decoding result->Re-feeding the corresponding interleaver to obtain +.>As input to the next basic signal estimator, the next iteration is started. After reaching the maximum iteration, outputting the expected value of the decoder after the iteration>
S6: and carrying out soft decision on the expected value of the decoder according to a modulation mode, wherein a soft decision result is the expected value of the decoder, and outputting the soft decision result.
After modifying the number of frames and the number of data segments, the obtained performance is better than that shown in fig. 2, wherein the abscissa is the threshold of the PAPR and the ordinate is the probability of exceeding the threshold of the PAPR.
Example 4
As shown in fig. 3, a peak-to-average ratio suppression device includes at least one processor, a signal transmitter, a signal receiver, and a memory communicatively coupled to the at least one processor; the signal transmitter is capable of transmitting a data signal and the signal receiver is capable of receiving the data signal; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a peak-to-average ratio suppression method based on polyphase interleaved modulation as described in the previous embodiments. The input/output interface can comprise a display, a keyboard, a mouse and a USB interface, and is used for inputting and outputting data; the power supply is used to provide power to the device.
Those skilled in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.
The above-described integrated units of the invention, when implemented in the form of software functional units and sold or used as stand-alone products, may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The peak-to-average ratio suppression method based on multiphase interleaving modulation is characterized by comprising the following steps of:
transmitting end:
s1: modulating the transmission data to obtain a plurality of modulation symbols; the modulation processing comprises segmentation, error correction, interleaving and constellation mapping;
s2: multiplying the modulation symbol with the corresponding phase factor, and outputting a transmission symbol;
s3: sequentially superposing the transmission symbols, outputting a transmission signal and transmitting the transmission signal;
the receiving end:
s4: receiving the transmitting signal and obtaining a demodulation signal from the transmitting signal;
s5: initializing a decoder estimated value function, sending the function and the demodulation signal into a basic signal estimator for iteration, and outputting an iterated decoder expected value;
s6: performing soft decision on the expected value of the decoder according to a modulation mode, wherein a soft decision result is the expected value of the decoder, and outputting the soft decision result;
the step S1 includes:
s11: dividing the transmission data frame by frame, and dividing the transmission data of each frame into U data segments equally in sequence; wherein U is a preset natural number;
s12: sequentially performing error correction coding on the data segments and outputting error correction data segments;
s13: interleaving the error correction data segments with corresponding interleavers in sequence, and outputting interleaved data segments; the interleaver is a preset sequence of cyclic shift;
s14: performing constellation mapping processing on the interleaved data segment, and outputting a modulation symbol;
the calculation formula of the phase factor is as follows:
wherein ρ is k,l For the phase factor, p, of the kth data segment of the first frame k,l Is the transmission power, θ, of the data segment k,l As the phase offset, θ k,l ＝(k-1)π/2U。
2. The peak-to-average ratio suppression method according to claim 1, wherein the error correction coding rate in the step S12 is r=n/M, where N is the number of bits of each data segment, and M is the number of bits of each data segment after coding.
3. The peak-to-average ratio suppressing method based on multiphase interleaved modulation according to claim 2 wherein the displacement of adjacent interleavers in step S13 is M/(UL).
4. The peak-to-average power ratio suppression method based on multi-phase interleaving modulation according to claim 1, wherein the constellation mapping process in the step S14 is BPSK constellation mapping.
5. The peak-to-average ratio suppressing method based on multiphase interleaved modulation according to claim 1 wherein said step S5 comprises the steps of:
s51: initializing decoder estimation functionsThe number of iterations t=0; wherein l is a frame number, k is a data segment number, and n is a transmission symbol number;
s52: calculation ofLog-likelihood ratio>And the log likelihood ratio +.>Input to a deinterleaver;
s53: transmitting the output result of the de-interleaver to an error correction coder decoder to obtain a decoding result
S54: the result of the coding is processedIs sent to an interleaver, and the estimated value of the decoder is output +.>The iteration number t=t+1;
s55: judging whether the iteration times t are equal to a preset maximum iteration times or not, if so, entering step S52; if the number of iterations is equal to the preset maximum number of iterations, outputting Is the expected value of the decoder.
6. The peak-to-average ratio suppressing method based on multiphase interleaved modulation according to claim 5 wherein the log likelihood ratio in step S52The calculation formula of (2) is as follows:
wherein r is n For the demodulated signal, wherein E (& gt) and Var (& gt) represent a desired value function and a variance function, respectively,representing the interference experienced by the kth data segment of the first frame.
7. A peak-to-average ratio suppression device comprising at least one processor, a signal transmitter, a signal receiver, and a memory communicatively coupled to the at least one processor; the signal transmitter is capable of transmitting a data signal and the signal receiver is capable of receiving the data signal; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210617715.6A CN114978845B (en) | 2022-06-01 | 2022-06-01 | Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210617715.6A CN114978845B (en) | 2022-06-01 | 2022-06-01 | Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114978845A CN114978845A (en) | 2022-08-30 |
| CN114978845B true CN114978845B (en) | 2023-08-22 |
Family
ID=82960272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210617715.6A Active CN114978845B (en) | 2022-06-01 | 2022-06-01 | Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114978845B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753848A (en) * | 2015-04-17 | 2015-07-01 | 临沂大学 | Low-complexity peak-to-average ratio restraining method for optical communication DCO-OFDM (direct current-biased optical-orthogonal frequency division multiplexing) system |
| CN106941470A (en) * | 2017-02-21 | 2017-07-11 | 东南大学 | A kind of method of signal peak-to-average ratio in reduction FBMC systems |
| CN110324065A (en) * | 2019-06-06 | 2019-10-11 | 大连理工大学 | A kind of multi-user's underwater acoustic communication method based on cyclic shift keying band spectrum modulation |
| CN110351216A (en) * | 2019-07-10 | 2019-10-18 | 哈尔滨工程大学 | A kind of partial transmission sequence method for suppressing peak to average ratio based on precoding |
| CN112039814A (en) * | 2020-07-28 | 2020-12-04 | 上海工程技术大学 | Peak-to-average power ratio (PAPR) suppression method for Orthogonal Frequency Division Multiplexing (OFDM)/orthogonal frequency division multiplexing (OQAM) system and application thereof |
| CN113242190A (en) * | 2021-04-13 | 2021-08-10 | 华南理工大学 | Multichannel communication minimum bit error rate Turbo equalization method based on posterior soft symbol |
| CN113347131A (en) * | 2021-05-19 | 2021-09-03 | 大连海事大学 | Improved SLM-PTS peak-to-average power ratio restraining method |
| CN113746597A (en) * | 2021-08-03 | 2021-12-03 | 北京理工大学 | Bit-interleaved Turbo coding LoRa modulation method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7095812B2 (en) * | 2002-06-24 | 2006-08-22 | Agere Systems Inc. | Reduced complexity receiver for space-time- bit-interleaved coded modulation |
| US9036992B2 (en) * | 2012-10-09 | 2015-05-19 | Nec Laboratories America, Inc. | LDPC-coded modulation for ultra-high-speed optical transport in the presence of phase noise |
| US11621799B2 (en) * | 2020-05-08 | 2023-04-04 | Qualcomm Incorporated | Peak-to-average power ratio reduction |
-
2022
- 2022-06-01 CN CN202210617715.6A patent/CN114978845B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753848A (en) * | 2015-04-17 | 2015-07-01 | 临沂大学 | Low-complexity peak-to-average ratio restraining method for optical communication DCO-OFDM (direct current-biased optical-orthogonal frequency division multiplexing) system |
| CN106941470A (en) * | 2017-02-21 | 2017-07-11 | 东南大学 | A kind of method of signal peak-to-average ratio in reduction FBMC systems |
| CN110324065A (en) * | 2019-06-06 | 2019-10-11 | 大连理工大学 | A kind of multi-user's underwater acoustic communication method based on cyclic shift keying band spectrum modulation |
| CN110351216A (en) * | 2019-07-10 | 2019-10-18 | 哈尔滨工程大学 | A kind of partial transmission sequence method for suppressing peak to average ratio based on precoding |
| CN112039814A (en) * | 2020-07-28 | 2020-12-04 | 上海工程技术大学 | Peak-to-average power ratio (PAPR) suppression method for Orthogonal Frequency Division Multiplexing (OFDM)/orthogonal frequency division multiplexing (OQAM) system and application thereof |
| CN113242190A (en) * | 2021-04-13 | 2021-08-10 | 华南理工大学 | Multichannel communication minimum bit error rate Turbo equalization method based on posterior soft symbol |
| CN113347131A (en) * | 2021-05-19 | 2021-09-03 | 大连海事大学 | Improved SLM-PTS peak-to-average power ratio restraining method |
| CN113746597A (en) * | 2021-08-03 | 2021-12-03 | 北京理工大学 | Bit-interleaved Turbo coding LoRa modulation method |
Non-Patent Citations (1)
| Title |
|---|
| OFDM系统中PTS技术的改进;高燕;孙辉;;中国无线电(第12期);1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114978845A (en) | 2022-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6862552B2 (en) | Methods, apparatus, and systems employing soft decision decoding | |
| US8467477B2 (en) | Decoding system for LDPC code concatenated with 4QAM-NR code | |
| US20070297496A1 (en) | Apparatus and method for iterative detection and decoding in multiple antenna system | |
| US20040013084A1 (en) | Training prefix modulation method and receiver | |
| EP4138305A1 (en) | Low-complexity selected mapping method using cyclical redundancy check | |
| US7974358B2 (en) | Orthogonal frequency division multiplexing (OFDM) encoding and decoding methods and systems | |
| Al-Rawi et al. | Exploiting error-control coding and cyclic-prefix in channel estimation for coded OFDM systems | |
| US6731595B2 (en) | Multi-carrier modulation and demodulation system using a half-symbolized symbol | |
| KR20010108266A (en) | Communication device and communication method | |
| CN114978845B (en) | Peak-to-average ratio suppression method and equipment based on multiphase interleaving modulation | |
| US20080069273A1 (en) | System for Compensating Turbodecoder Phase Shift | |
| US20160065329A1 (en) | Single carrier communications harnessing nonlinearity | |
| Lakshmi et al. | Performance comparison of channel coding techniques for OFDM system | |
| EP2852079B1 (en) | Receiving device and receiving method | |
| CN115276912A (en) | Decoding cascade iterative underwater acoustic communication system based on Gauss approximate improved polarization code | |
| KR101040605B1 (en) | Spatial modulation method and apparatus in multiple antenna system, and demodulation method and apparatus of spatial-modulated signal | |
| Al-Rawi et al. | An iterative receiver for coded OFDM systems over time-varying wireless channels | |
| Ogundile et al. | Improved reliability information for OFDM systems on time-varying frequency-selective fading channels | |
| CN101394188B (en) | Low density parity check code and decoding system in cascade connection with 4QAM-NR | |
| CN112332948B (en) | Multi-service transmission sending and receiving method, system, medium and device | |
| Rohling et al. | OFDM systems with differential modulation schemes and turbo decoding techniques | |
| Ureten et al. | Decision directed iterative equalization of OFDM symbols using non-uniform interpolation | |
| Khan et al. | A joint error correction and ICI cancellation algorithm for OFDM systems | |
| Ogundile et al. | Iterative channel estimation and symbol level reed-solomon decoding receivers for ofdm systems | |
| Kumar | Improving the Bit Error Rate of OFDM using Convolutional codes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |