CN107896206B - The method and system for reducing ofdm system peak-to-average power ratio are inserted into based on four dimensional signals - Google Patents
The method and system for reducing ofdm system peak-to-average power ratio are inserted into based on four dimensional signals Download PDFInfo
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- CN107896206B CN107896206B CN201711106287.6A CN201711106287A CN107896206B CN 107896206 B CN107896206 B CN 107896206B CN 201711106287 A CN201711106287 A CN 201711106287A CN 107896206 B CN107896206 B CN 107896206B
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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
Abstract
The invention discloses a kind of method and system that reduction ofdm system peak-to-average power ratio is inserted into based on four dimensional signals.On the basis of traditional DSI method, proposes and be inserted into ofdm signal subcarrier with the virtual sequence that four dimensional signals replace tradition not carry information, each four dimensional signal occupies two subcarriers, and data transmission efficiency does not reduce compared with traditional DSI method.Since four-dimensional signal constellation (in digital modulation) figure can provide bigger search freedom degree, so can more effectively improve the peak-to-average power ratio of ofdm system under same search complexity and system data transmission efficiency term, and no need to send side informations.In addition, under the premise of not changing the ofdm signal mean power of transmission, four-dimensional signal constellation (in digital modulation) figure has bigger minimum euclid distance, therefore the also available certain raising of the error performance of system compared with being inserted into 2D signal.
Description
Technical field
The present invention relates to wireless communication technology fields, and in particular to one kind reduces orthogonal frequency division multiplexing based on the insertion of four dimensional signals
With the method for (OFDM) system peak-to-average power ratio.
Background technique
The advantages that due to availability of frequency spectrum height, effective mitigating frequency-selective fading and being easily achieved, orthogonal frequency division multiplexing
(OFDM) technology has been widely used in various wireless communication systems, as WLAN (WLAN), wireless MAN
(WMAN) and worldwide interoperability for microwave accesses (WiMAX) etc..The major defect of ofdm system first is that peak-to-average power ratio (PAPR) mistake
It is high.High PAPR requires the power amplifier of system transmitting terminal to have the very big range of linearity, otherwise when signal is beyond amplifier
When the range of linearity, distorted signals, system performance decline will result in.And the range of linearity cost for increasing power amplifier is excessively high.
In order to reduce the PAPR of ofdm system, many methods have been suggested and have applied, as chopping techniques, Choose for user
(SLM), partial transmission sequence (PTS) and virtual sequence insertion (DSI) etc..SLM and PTS technology can effectively improve PAPR, but
Both technologies need to send additional side information to receiving end, and the error of transmission of side information will lead to the mistake of system
It can decline.DSI method is not necessarily to transmitted sideband information while being effectively reduced ofdm system PAPR, and keeps system performance
It does not reduce.Although the virtual sequence of insertion reduces to a certain extent instead of original data subcarrier in DSI technology
The data transmission efficiency of system, but system realizes simple, and the complexity that can be effectively improved PAPR performance, not will increase receiving end
Degree.DSI technology has been proved to suitable for WiMAX system.
Selection to insertion virtual sequence is the core content of DSI technology.In current research, for the virtual of insertion
Sequence is generally complementary series and correlated series, then searching algorithm is recycled to find the sequence group for keeping ofdm signal PAPR minimum
It closes.It is some other insertion virtual sequences methods be also suggested, but due to the virtual sequence of insertion be based on 2D signal and
Any information is not carried, it is caused not have improvement result to the performance of system.Four dimensional signals have been proved to can be applied to count
Word communication system, under conditions of transmission average power signal is equal, the more traditional two dimension of identical size four-dimension signal constellation (in digital modulation) figure
Signal constellation (in digital modulation) figure has bigger minimum euclid distance, so it is logical to can effectively improve number using four-dimensional signal constellation (in digital modulation) figure
The error performance of letter system.
Summary of the invention
The technical problem to be solved in the present invention is that the technological deficiency excessively high for above-mentioned ofdm system PAPR, provides
It is a kind of to be inserted into the method and system for reducing ofdm system peak-to-average power ratio based on four dimensional signals.
Wherein one side according to the present invention, the present invention are to solve its technical problem, are provided a kind of based on four dimensional signals
The method that insertion reduces ofdm system peak-to-average power ratio, comprises the following steps:
(1) the binary digital signal input serioparallel exchange module that information source generates is handled, serial bit stream
Parallel data is converted to, wherein every b=log2One group of M-bit is used as index signal to input mapper, and M is is used 2D signal
The size of planisphere；
(2) output signal of step (1) is mapped to each subcarrier of frequency domain ofdm signal, every height by planisphere
Carrier wave is expressed as a plural number or real number form, and the mapping is mapped two parts and formed by 2D signal mapping and four dimensional signals,
Preceding N -2L subcarriers of ofdm signal are mapped using 2D signal planisphere, and rear 2L subcarrier uses four dimensional signal stars
Seat figure is mapped, and wherein N is the sub-carrier number of ofdm signal, and L is four dimensional signal numbers of insertion；
(3) it is operated by IFFT and the frequency domain ofdm signal obtained after step (2) mapping is modulated to time domain；
(4) time domain OFDM signal for obtaining step (3) inputs peak-to-average power ratio comparator, is found most by searching algorithm
Good insertion four-dimension signal sequence combination, minimizes the PAPR of ofdm signal；
(5) PAPR that step (4) the obtains ofdm signal minimized is input to parallel serial conversion module, parallel data is turned
It is changed to serial data, then is transmitted by channel；
(6) receiving end will receive signal input serioparallel exchange module and handle, and serial data is converted to parallel data；
(7) step (6) treated signal is subjected to FFT operation, time domain OFDM signal is transformed into frequency domain；
(8) demapping processing is carried out to the output signal of step (7), preceding N -2L subcarriers carry out 2D signal demapping
Processing, rear 2L subcarrier carry out the processing of four dimensional signal demappings.
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, step
Suddenly the output signal of serioparallel exchange module is mapped with the specific steps of four dimensional signals mapping such as by 2D signal respectively in (2)
Under:
(21) the preceding N -2L of ofdm signal subcarriers are mapped using 2D signal planisphere, each subcarrier maps
For a complex data, the baseband signal after mapping is indicated are as follows:
X2D=[Xm,0Xm,1...Xm,N-2L-1]
In formula: XmIt indicates complex data, represents a signaling point in two dimensional constellation figure, 0≤m≤M-1；
(22) the rear 2L subcarrier of ofdm signal is mapped using four-dimensional signal constellation (in digital modulation) figure, and each four dimensional signal occupies
Two subcarriers are mapped as two complex datas, and the baseband signal after mapping indicates are as follows:
X4D=[Sm',0Sm',1...Sm',L-1]
=[xm',0+jym',0zm',0+jkm',0xm',1+jym',1zm',1+jkm',1…xm',L-1+jym',L-1zm',L-1+jkm',L-1]
In formula:A signaling point in the four-dimensional planisphere of expression, 0
≤ m '≤M ' -1, x, y, z and k indicate coordinate of the be inserted into signal in four-dimensional planisphere, and four can be made up of any combination
Two plural numbers, M ' four-dimensional signal constellation (in digital modulation) figure size, M ' > M used by indicating map four dimensional signals, every two subcarrier
Corresponding two or more four dimensional signals, they represent same bit information, and when mapping is randomly selected；After mapping
Frequency domain base band OFDM signal indicate are as follows:
X=[X2DX4D]=[Xm,0Xm,1…Xm,N-2L-1Sm',0Sm',1…Sm',L-1]。
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, institute
It states in step (21) and 2D signal mapping is realized using M-ary orthogonal amplitude modulation (MQAM) planisphere.
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, step
Suddenly (4) include the following steps: in combination with step (2) and step (3)
(41) index signal inputted carries out IFFT tune after 2D signal mapper and four-dimensional signal mapper mapping
System, modulated time domain OFDM signal are input to peak-to-average power ratio comparator and calculate PAPR as initial fiducial value；
(42) setting maps four-dimensional channel distortion experienced X4DIndex variables i=1；
(43) indicate that four dimensional signals of same bits information replace original signal with others respectively, selecting one believes OFDM
Number the smallest four dimensional signal of PAPR；
(44) as new i after i being added 1, step (43) are back to, until i=L+1 search process terminates.
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, step
Suddenly demapping processing includes the processing of 2D signal demapping and the processing of four dimensional signal demappings in (8), in which:
The processing of 2D signal demapping refers to: by calculating all letters received in signal and used two dimensional constellation figure
Number point distance is original transmission signal apart from the smallest judgement.
The processing of four dimensional signal demappings refers to: receiving signal and all expression phases in used four-dimensional constellation by calculating
With the signaling point distance of bit information, adjudicate with one of them apart from the smallest as original transmission signal.
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, step
Suddenly de-mapping process is handled using maximum- likelihood estimation in (8).
Further, it is inserted into the method for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, step
Suddenly after (8) further include:
(9) signal for obtaining step (8) carries out parallel-serial conversion, and parallel data are converted to serial data, restores
Original binary digital signal out.
According to another aspect of the present invention, the present invention is to solve its technical problem, is additionally provided a kind of based on four dimensional signals
The system that insertion reduces ofdm system peak-to-average power ratio includes following module:
Transmitting terminal serioparallel exchange module circulates serial bit for handling the binary digital signal of information source generation
It is changed to parallel data, wherein every b=log2One group of M-bit is used as index signal to input mapper, and M is is used 2D signal star
The size of seat figure；
Processing module is mapped, for the output signal of transmitting terminal serioparallel exchange module to be mapped to frequency domain by planisphere
Each subcarrier of ofdm signal, each subcarrier are expressed as a plural number or real number form, and the mapping is reflected by 2D signal
It penetrates and maps two parts composition with four dimensional signals, preceding N -2L subcarriers of ofdm signal are reflected using 2D signal planisphere
It penetrates, rear 2L subcarrier is mapped using four-dimensional signal constellation (in digital modulation) figure, and wherein N is the sub-carrier number of ofdm signal, and L is insertion
Four dimensional signal numbers；
IFFT processing module, for mapping the frequency domain ofdm signal tune obtained after processing module mapping by IFFT operation handlebar
Make time domain；
Peak-to-average power ratio comparator module, for calculating the peak-to-average power ratio of ofdm signal and being found most by searching algorithm
Good insertion four-dimension signal sequence combination, minimizes the PAPR of ofdm signal；
Transmitting terminal parallel serial conversion module, the ofdm signal for minimizing obtained PAPR carries out parallel-serial conversion, simultaneously
Row data are converted to serial data, then are transmitted by channel；
The signal received is carried out serioparallel exchange processing for receiving end, serial number by receiving end serioparallel exchange module
According to being converted to parallel data；
FFT processing module, for serioparallel exchange module treated signal in receiving end to be carried out FFT operation, time domain
Ofdm signal is transformed into frequency domain；
Demapping processing module carries out demapping processing for the output signal to FFT processing module, and preceding N -2L sons carry
Wave carries out the processing of 2D signal demapping, and rear 2L subcarrier carries out the processing of four dimensional signal demappings.
Further, it is inserted into the system for reducing ofdm system peak-to-average power ratio of the invention based on four dimensional signals, also
Include:
Receiving end parallel serial conversion module restores original binary system for the signal after demapping to be carried out parallel-serial conversion
Digital signal.
The present invention proposes on the basis of traditional DSI method and replaces tradition not carry the virtual of information with four dimensional signals
Sequence is inserted into ofdm signal subcarrier, and each four dimensional signal occupies two subcarriers, and data are transmitted compared with traditional DSI method
Efficiency does not reduce.Since four-dimensional signal constellation (in digital modulation) figure can provide bigger search freedom degree, so complicated in same search
The PAPR of ofdm system can more effectively be improved under degree and system data transmission efficiency term, and no need to send sideband letters
Breath.In addition, compared with being inserted into 2D signal, under the premise of not changing the ofdm signal mean power of transmission, four-dimensional signal constellation (in digital modulation)
Figure has bigger minimum euclid distance, therefore the also available certain raising of the error performance of system.
Detailed description of the invention
Fig. 1 is system block diagram of the invention；
Fig. 2 is four dimensional signals insertion method schematic diagram proposed by the present invention.
Specific embodiment
In order to which technical characteristic and purpose of the invention are more clearly understood, now compareing attached drawing, the present invention will be described in detail
Specific embodiment.
Referring to FIG. 1, it is the system block diagram proposed by the present invention that reduction ofdm system PAPR is inserted into based on four dimensional signals,
Including transmitting terminal, channel and the part of receiving end three.Transmitting terminal includes serioparallel exchange module, 2D signal mapper, four-dimensional letter
Number mapper, IFFT, peak-to-average power ratio comparator and parallel serial conversion module；Receiving end includes serioparallel exchange module, FFT, two dimension
Signal demapper, four-dimensional signal demapper and parallel serial conversion module.The sub-carrier number of ofdm signal is set as N, insertion
Four dimensional signal numbers are L, since each four letters signal need to occupy two subcarriers, so L is necessarily less than or is equal to N/2.
The method for reducing ofdm system peak-to-average power ratio is inserted into based on four dimensional signals, comprising the following steps:
(1) binary digital signal that information source generates inputs serioparallel exchange module first and is handled, serial bit
Circulation is changed to parallel data, wherein every b=log2One group of M-bit is used as index signal to input mapper, and M is is used two dimension to believe
The size of number planisphere.
(2) mapping is handled.Mapping processing is that step (1) treated signal is mapped to frequency-domain OFDM by planisphere to believe
Number each subcarrier, each subcarrier is expressed as a plural number or real number form.Demapping section of the invention is by 2D signal
Mapping and four dimensional signals map two parts composition.Specific mapping process and subcarrier distribution principle are as shown in Figure 2.
1) the preceding N -2L of ofdm signal subcarriers are mapped using traditional 2D signal planisphere, each subcarrier
It is mapped as a complex data, generally uses M-ary orthogonal amplitude modulation (MQAM), the baseband signal after mapping may be expressed as:
X2D=[Xm,0Xm,1…Xm,N-2L-1]
In formula: XmIt indicates complex data, represents a signaling point in MQAM planisphere, 0≤m≤M-1.
2) the rear 2L subcarrier of ofdm signal is mapped using four-dimensional signal constellation (in digital modulation) figure, and each four dimensional signal occupies two
A subcarrier, is mapped as two complex datas, and the baseband signal after mapping may be expressed as:
X4D=[Sm',0Sm',1...Sm',L-1]
=[xm',0+jym',0zm',0+jkm',0xm',1+jym',1zm',1+jkm',1...xm',L-1+jym',L-1zm',L-1+jkm',L-1]
In formula:A signaling point in the four-dimensional planisphere of expression, 0
≤ m '≤M ' -1, x, y, z and k indicate coordinate of the be inserted into signal in four-dimensional planisphere, and four can be made up of any combination
Two plural numbers, M ' four-dimensional signal constellation (in digital modulation) figure size, usual M ' > M used by indicating.Four dimensional signals are mapped, every two
Carrier wave corresponds to two or more four dimensional signals, they represent same bit information, provides for reduction PAPR bigger
Freedom degree is searched for, when mapping is randomly selected.Frequency domain base band OFDM signal after mapping indicates are as follows:
X=[X2DX4D]=[Xm,0Xm,1...Xm,N-2L-1Sm',0Sm',1...Sm',L-1]
Since each four dimensional signal occupies two ofdm signal subcarriers, so average in the ofdm signal for not changing transmission
Under power condition, identical size four-dimension signal constellation (in digital modulation) figure mean power is two times of conventional two-dimensional signal constellation (in digital modulation) figure mean power,
It can still provide the minimum euclid distance bigger compared with 2D signal planisphere, have to the error performance of system certain
PAPR performance and the bit error rate performance improvement of improvement result, and increasing with four dimensional signal numbers of insertion, system become apparent.
(3) time domain is modulated to by the frequency domain ofdm signal X that IFFT operation handlebar step (2) obtains.
(4) time domain OFDM signal for obtaining step (3) inputs peak-to-average power ratio comparator, is found most by searching algorithm
Good insertion four-dimension signal sequence combination, minimizes the PAPR of ofdm signal.Wherein search process includes the following steps:
1) output signal of serioparallel exchange module carries out after 2D signal mapper and four-dimensional signal mapper mapping
IFFT modulation, modulated time domain OFDM signal are input to peak-to-average power ratio comparator and calculate PAPR as initial fiducial value；
2) setting maps four-dimensional channel distortion experienced X4DIndex variables i=1；
3) indicate that four dimensional signals of same bits information replace original signal with others respectively, selecting one makes ofdm signal
The smallest four dimensional signal of PAPR；
4) as new i after i being added 1, it is back to step 3), until i=L+1 search process terminates.
(5) ofdm signal that step (4) obtains is input to parallel serial conversion module, then is transmitted by channel.
(6) receiving end will receive signal input serioparallel exchange module and handle, and serial data is converted to parallel data.
(7) step (6) treated signal is subjected to FFT operation, the time domain OFDM signal received is transformed into frequency domain.
(8) demapping is handled.2D signals are carried out to -2L subcarriers of N before step (7) treated frequency domain ofdm signal
Demapping processing, rear 2L subcarrier carry out the processing of four dimensional signal demappings.De-mapping process uses maximum- likelihood estimation.
1) 2D signal demapping.Signal (treated for step (7)) and used two dimensional constellation are received by calculating
All signaling point distances in figure are original transmission signal apart from the smallest judgement.
2) four dimensional signal demapping.Signal (treated for step (7)) and used four-dimensional constellation are received by calculating
In it is all indicate same bits information signaling point distances, with one of them apart from it is the smallest judgement be original transmission signal.
(9) signal that step (8) obtains is subjected to parallel-serial conversion and restores original binary digital signal.
Compared with prior art, the present invention has the following effects that gain: the present invention mentions on the basis of traditional DSI method
Go out and be inserted into ofdm signal subcarrier with the virtual sequence that four dimensional signals replace tradition not carry information, each four dimensional signal accounts for
With two subcarriers, data transmission efficiency is not reduced compared with traditional DSI method.Since four-dimensional signal constellation (in digital modulation) figure can provide
Bigger search freedom degree, so can more effectively improve under same search complexity and system data transmission efficiency term
The PAPR of ofdm system, and no need to send side informations.In addition, not changing transmission compared with being inserted into 2D signal
Under the premise of ofdm signal mean power, four-dimensional signal constellation (in digital modulation) figure has bigger minimum euclid distance, therefore the difference of system
The also available certain raising of wrong performance.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (7)
1. a kind of be inserted into the method for reducing ofdm system peak-to-average power ratio based on four dimensional signals, which is characterized in that include following step
It is rapid:
(1) the binary digital signal input serioparallel exchange module that information source generates is handled, serial bit stream is converted
For parallel data, wherein every b=log2One group of M-bit is used as index signal to input mapper, and M is is used 2D signal constellation
The size of figure；
(2) output signal of step (1) is mapped to each subcarrier of frequency domain ofdm signal, each subcarrier by planisphere
It is expressed as a plural number or real number form, the mapping is mapped two parts and formed by 2D signal mapping and four dimensional signals, OFDM
Preceding N -2L subcarriers of signal are mapped using 2D signal planisphere, and rear 2L subcarrier is using four-dimensional signal constellation (in digital modulation) figure
It is mapped, wherein N is the sub-carrier number of ofdm signal, and L is four dimensional signal numbers of insertion；
(3) it is operated by IFFT and the frequency domain ofdm signal obtained after step (2) mapping is modulated to time domain；
(4) time domain OFDM signal for obtaining step (3) inputs peak-to-average power ratio comparator, is found by searching algorithm optimal
It is inserted into four-dimensional signal sequence combination, minimizes the peak-to-average power ratio of ofdm signal；
(5) ofdm signal that the peak-to-average power ratio that step (4) obtains minimizes is input to parallel serial conversion module, parallel data
Serial data is converted to, then is transmitted by channel；
(6) receiving end will receive signal input serioparallel exchange module and handle, and serial data is converted to parallel data；
(7) step (6) treated signal is subjected to FFT operation, time domain OFDM signal is transformed into frequency domain；
(8) demapping processing is carried out to the output signal of step (7), preceding N -2L subcarriers carry out at 2D signal demapping
Reason, rear 2L subcarrier carry out the processing of four dimensional signal demappings；
Step (2)~(4) include the following steps:
(41) index signal inputted carries out IFFT modulation after 2D signal mapper and four-dimensional signal mapper mapping,
Modulated time domain OFDM signal is input to peak-to-average power ratio comparator and calculates peak-to-average power ratio as initial fiducial value；
(42) setting maps four-dimensional channel distortion experienced X4DIndex variables i=1；
(43) indicate that four dimensional signals of same bits information replace original signal with others respectively, selecting one makes ofdm signal peak
The smallest four dimensional signal of equal power ratio；
(44) as new i after i being added 1, step (43) are back to, until i=L+1 search process terminates.
2. according to claim 1 be inserted into the method for reducing ofdm system peak-to-average power ratio, feature based on four dimensional signals
It is, the output signal of serioparallel exchange module is passed through into the tool of 2D signal mapping and the mapping of four dimensional signals respectively in step (2)
Steps are as follows for body:
(21) the preceding N -2L of ofdm signal subcarriers are mapped using 2D signal planisphere, and each subcarrier maps are one
A complex data, the baseband signal after mapping indicate are as follows:
X2D=[Xm,0 Xm,1...Xm,N-2L-1]；
In formula: XmIt indicates complex data, represents a signaling point in two dimensional constellation figure, 0≤m≤M-1；
(22) the rear 2L subcarrier of ofdm signal is mapped using four-dimensional signal constellation (in digital modulation) figure, and each four dimensional signal occupies two
Subcarrier is mapped as two complex datas, and the baseband signal after mapping indicates are as follows:
In formula:Sm’=(xm’+jym’zm’+jkm’) indicate a signaling point in four-dimensional planisphere, 0≤m '≤M '-
1, x, y, z and k indicate coordinate of the be inserted into signal in four-dimensional planisphere, and four can form two plural numbers by any combination,
M ' four-dimensional signal constellation (in digital modulation) figure size, M ' > M used by indicating map four dimensional signals, every two subcarrier it is corresponding two or
More than two four dimensional signals, they represent same bit information, and when mapping is randomly selected；Frequency domain base band after mapping
Ofdm signal indicates are as follows:
X=[X2D X4D]=[Xm,0 Xm,1...Xm,N-2L-1 Sm',0 Sm',1...Sm',L-1]。
3. according to claim 2 be inserted into the method for reducing ofdm system peak-to-average power ratio, feature based on four dimensional signals
It is, 2D signal mapping is realized using M-ary orthogonal amplitude modulation planisphere in the step (21).
4. according to claim 1 be inserted into the method for reducing ofdm system peak-to-average power ratio, feature based on four dimensional signals
It is, demapping processing includes that the processing of 2D signal demapping and four dimensional signal demappings are handled in the step (8),
In:
The processing of 2D signal demapping refers to: by calculating all signaling points received in signal and used two dimensional constellation figure
Distance is original transmission signal apart from the smallest judgement；
The processing of four dimensional signal demappings refers to: mutually year-on-year by calculating all expressions in reception signal and used four-dimensional constellation
The signaling point distance of special information is adjudicated with one of them apart from the smallest as original transmission signal.
5. according to claim 1 be inserted into the method for reducing ofdm system peak-to-average power ratio, feature based on four dimensional signals
It is, de-mapping process is handled using maximum- likelihood estimation in step (8).
6. according to claim 1 be inserted into the method for reducing ofdm system peak-to-average power ratio, feature based on four dimensional signals
It is, after step (8) further include:
(9) signal for obtaining step (8) carries out parallel-serial conversion, and parallel data are converted to serial data, recover original
The binary digital signal of beginning.
7. a kind of be inserted into the system for reducing ofdm system peak-to-average power ratio based on four dimensional signals, which is characterized in that comprising such as lower die
Block:
Transmitting terminal serioparallel exchange module is converted to serial bit stream for handling the binary digital signal of information source generation
Parallel data, wherein every b=log2One group of M-bit is used as index signal to input mapper, and M is is used 2D signal planisphere
Size；
Processing module is mapped, for the output signal of transmitting terminal serioparallel exchange module to be mapped to frequency-domain OFDM letter by planisphere
Number each subcarrier, each subcarrier is expressed as a plural number or real number form, and the mapping is by 2D signal mapping and four
Dimensional signal maps two parts composition, and preceding N -2L subcarriers of ofdm signal are mapped using 2D signal planisphere, rear 2L
A subcarrier is mapped using four-dimensional signal constellation (in digital modulation) figure, and wherein N is the sub-carrier number of ofdm signal, and L is the four-dimensional letter of insertion
Number number；
IFFT processing module is modulated to for mapping the frequency domain ofdm signal obtained after processing module mapping by IFFT operation handlebar
Time domain；
Peak-to-average power ratio comparator module, for calculating the peak-to-average power ratio of ofdm signal and being found by searching algorithm optimal
It is inserted into four-dimensional signal sequence combination, minimizes the peak-to-average power ratio of ofdm signal；
Transmitting terminal parallel serial conversion module, the ofdm signal for minimizing obtained peak-to-average power ratio carry out parallel-serial conversion,
Parallel data is converted to serial data, then is transmitted by channel；
The signal received is carried out serioparallel exchange processing for receiving end, serial data is turned by receiving end serioparallel exchange module
It is changed to parallel data；
FFT processing module believes time domain OFDM for serioparallel exchange module treated signal in receiving end to be carried out FFT operation
Number it is transformed into frequency domain；
Demapping processing module carries out demapping processing for the output signal to FFT processing module, preceding N -2L subcarriers into
The processing of row 2D signal demapping, rear 2L subcarrier carry out the processing of four dimensional signal demappings；
Receiving end parallel serial conversion module restores original binary digit for the signal after demapping to be carried out parallel-serial conversion
Signal；
The mapping processing module, IFFT processing module and peak-to-average power ratio comparator module are specifically used for:
(41) index signal inputted carries out IFFT modulation after 2D signal mapper and four-dimensional signal mapper mapping,
Modulated time domain OFDM signal is input to peak-to-average power ratio comparator and calculates peak-to-average power ratio as initial fiducial value；
(42) setting maps four-dimensional channel distortion experienced X4DIndex variables i=1；
(43) indicate that four dimensional signals of same bits information replace original signal with others respectively, selecting one makes ofdm signal peak
The smallest four dimensional signal of equal power ratio；
(44) as new i after i being added 1, step (43) are back to, until i=L+1 search process terminates.
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| CN105308867A (en) * | 2013-06-19 | 2016-02-03 | 三菱电机株式会社 | Method and system for modulating data for optical communication |
| CN106878228A (en) * | 2017-03-28 | 2017-06-20 | 中国地质大学（武汉） | A kind of digital communication method based on the mapping of four-dimensional signal constellation (in digital modulation) figure with demapping |
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| CN105308867A (en) * | 2013-06-19 | 2016-02-03 | 三菱电机株式会社 | Method and system for modulating data for optical communication |
| CN106878228A (en) * | 2017-03-28 | 2017-06-20 | 中国地质大学（武汉） | A kind of digital communication method based on the mapping of four-dimensional signal constellation (in digital modulation) figure with demapping |
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