CN105450571A - Method and device for reducing peak to average power ratio - Google Patents
Method and device for reducing peak to average power ratio Download PDFInfo
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- CN105450571A CN105450571A CN201410423247.4A CN201410423247A CN105450571A CN 105450571 A CN105450571 A CN 105450571A CN 201410423247 A CN201410423247 A CN 201410423247A CN 105450571 A CN105450571 A CN 105450571A
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Abstract
A method for reducing the peak to average power ratio comprises the following steps: carrying out vector decomposition of a communication signal to obtain a homonymous component Xu and a quadrature component Yu; setting parameters K1 and K2 for compressing the communication signal; calculating a homonymous component Xu' and a quadrature component Yu' after compressing according to the homonymous component Xu, the quadrature component Yu, the parameter K1, the parameter K2 and a compression conversion function; and synthesizing the compressed communication signal according to the homonymous component Xu' and the quadrature component Yu' obtained through calculation. The invention further provides a device for reducing the peak to average power ratio. According to the invention, the peak to average power ratio of the communication signal of a multicarrier communication system can be effectively reduced.
Description
Technical field
The present invention relates to a kind of communication signal treatment technology, especially relate to a kind of method and the device that reduce the papr of communication signal.
Background technology
In existing multicarrier communication system framework, the signal being used for transmitting data sends after a series of process such as mapping, Zhan Pin, parallel-serial conversion, inverse discrete Fourier transform (DFT), analog-to-digital conversion and power amplifier at transmitting terminal, after receiving terminal receives the signal of transmission, restoring data after digital-to-analogue conversion, discrete Fourier transform (DFT), serioparallel exchange, Xie Zhanpin, demapping process.
But, signal in multicarrier communication system is obtained by multiple sub-carrier channels Signal averaging, the maximum instantaneous power of signal may differ greatly with average power, namely can produce very high papr (PeaktoAveragePowerRatio, PAPR).Papr is too high just requires that the power amplifier of transmitting terminal has larger linear dynamic range, to avoid distorted signals, the difficulty that the system which adds realizes and cost, so the papr reducing signal is very important for the transmitting of signal.
Summary of the invention
In view of above content, be necessary to provide a kind of method reducing papr, effectively can reduce the papr of the communication signal of multicarrier communication system.
In view of above content, there is a need to provide a kind of device reducing papr, effectively can reduce the papr of the communication signal of multicarrier communication system.
The method of described reduction papr comprises step: communication signal is carried out resolution of vectors, obtains component X in the same way
uwith quadrature component Y
u; The parameter K of this communication signal of compression is set
1and K
2, wherein parameter K
1for allowing component X in the same way
uwith quadrature component Y
uthe absolute value of maximum occurrences upon compression, parameter K
2for the constant that the amplitude compressed as required is arranged; According to component X in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '; And according to the X of component in the same way calculated
u 'and quadrature component Y
u ', the communication signal after synthesis compression.
The device of described reduction papr comprises: the first acquisition module, for communication signal is carried out resolution of vectors, obtains component X in the same way
uwith quadrature component Y
u; First arranges module, for arranging the parameter K of this communication signal of compression
1and K
2, wherein parameter K
1for allowing component X in the same way
uwith quadrature component Y
uthe absolute value of maximum occurrences upon compression, parameter K
2for the constant that the amplitude compressed as required is arranged; First computing module, for basis component X in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '; And first synthesis module, for according to the X of component in the same way calculated
u 'and quadrature component Y
u ', the communication signal after synthesis compression.
Compared to prior art, the method of described reduction papr and device, compressor reducer can be increased by the transmitting terminal at multicarrier communication system, thus the amplitude of communication signal is compressed at transmitting terminal, to reduce papr, reduce distorted signals, then increase expander to reduce communication signal at receiving terminal.
Accompanying drawing explanation
Fig. 1 is the running environment figure that the present invention reduces the device preferred embodiment of papr.
Fig. 2 is the overall process schematic diagram that in multicarrier communication system of the present invention, communication signal sends and receives.
Fig. 3 is the functional block diagram of the preferred embodiment of compressor reducer in the present invention.
Fig. 4 is the schematic diagram of the relation curve under different parameters condition before and after signal component compression.
Fig. 5 is the functional block diagram of the preferred embodiment of expander in the present invention.
Fig. 6 is the flow chart that the present invention reduces the compression process of the method preferred embodiment of papr.
Fig. 7 is the flow chart that the present invention reduces the process of expansion of the method preferred embodiment of papr.
Fig. 8-9 is complementary Cumulative Distribution Function performance schematic diagrames of communication signal under simulation different condition.
Main element symbol description
| Multicarrier communication system | 10 |
| Transmitting terminal | 2 |
| Receiving terminal | 4 |
| Channel | 6 |
| Reduce the device of papr | 12 |
| Compressor reducer | 20 |
| Expander | 40 |
| First acquisition module | 22 |
| First arranges module | 24 |
| First computing module | 26 |
| First synthesis module | 28 |
| Second acquisition module | 42 |
| Second arranges module | 44 |
| Second computing module | 46 |
| Second synthesis module | 48 |
| Multiplier | 602 |
| Integrator | 604 |
| Divider | 606 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Consulting shown in Fig. 1, is the running environment figure that the present invention reduces the device preferred embodiment of papr.The device 12 of described reduction papr applies in multicarrier communication system 10, comprises compressor reducer 20 and expander 40.Wherein compressor reducer 20 applies to the transmitting terminal 2 of multicarrier communication system 10, and expander 40 applies to the receiving terminal 4 of multicarrier communication system 10.In the present embodiment, multicarrier communication system 10 in conjunction with CDMA(CodeDivisionMultipleAccess, code division multiple access) and OFDM(OrthogonalFrequencyDivisionMultiplexing, OFDM) communication system of technology.Compressor reducer 20 is for compressing the component in the same way of communication signal and quadrature component, thus the amplitude of compression communication signal, to reduce papr.Expander 40 is for expanding the component in the same way of communication signal and quadrature component, thus the amplitude of expansion communication signal, to reduce communication signal.
Consulting shown in Fig. 2, is the overall process schematic diagram that in multicarrier communication system of the present invention, communication signal sends and receives.In the present embodiment, the communication signal of transmission data, after the transmitting terminal 2 of multicarrier communication system 10 passes through mapping, Zhan Pin, parallel-serial conversion, inverse discrete Fourier transform (DFT), compression, analog-to-digital conversion and power amplifier process, is sent to receiving terminal 4 via channel 6.After receiving terminal 4 receives this communication signal, restoring data after digital-to-analogue conversion, expansion, discrete Fourier transform (DFT), serioparallel exchange, Xie Zhanpin, demapping process.
It should be noted that, in multicarrier communication system 10, the role of transmitting terminal 2 and receiving terminal 4 may exchange, communication signal is sent by receiving terminal 4, transmitting terminal 2 receives communication signal, and therefore generally transmitting terminal 2 and receiving terminal 4 also comprise the functional module or the device that receive communication signal and send communication signal respectively.Such as, also comprise expander 40 in transmitting terminal 2, and also comprise compressor reducer 20 in receiving terminal 4.
Consulting shown in Fig. 3, is the functional block diagram of the preferred embodiment of compressor reducer in the present invention.Compressor reducer 20 comprises the first acquisition module 22, first and arranges module 24, first computing module 26 and the first synthesis module 28.Wherein also comprise multiplier 602 and integrator 604 in the first computing module 26.
First acquisition module 22, for communication signal is carried out resolution of vectors, obtains component X in the same way
uwith quadrature component Y
u.In the present embodiment, this communication signal is the communication signal obtained after mapping, Zhan Pin, parallel-serial conversion, inverse discrete Fourier transform (DFT) process at the transmitting terminal 2 of multicarrier communication system 10.Described resolution of vectors communication signal is decomposed into frequency is identical, peak amplitude is identical but two signal components of phase 90, usually adopts a sinusoidal signal to describe component X in the same way
u, adopt a cosine signal to describe quadrature component Y
u.The amplitude ρ of this communication signal
u=
.
First arranges module 24 for arranging the parameter K of this communication signal of compression
1and K
2.Wherein, parameter K
1for allowing signal component (component X in the same way
uwith quadrature component Y
u) absolute value of maximum occurrences upon compression, parameter K
2for the constant that the amplitude compressed as required is arranged, and parameter K
1and K
2be arithmetic number.Consulting shown in Fig. 4, is the schematic diagram of the relation curve under different parameters condition before and after signal component compression.Wherein, transverse axis represents the value of the signal component before compression, and the longitudinal axis represents the value of the signal component after compression.
Visible, parameter K
1determine the scope of the signal component after compression, such as, work as K
1when=1, the scope of the signal component after compression is [-1,1]; Work as K
1when=2, the scope of the signal component after compression is [-2,2].And parameter K
2determine the form of described relation curve, such as, work as K
2when≤2, the similar reduction curve of described relation curve, because suppressed range is larger, now the papr range of decrease of this communication signal is comparatively large, but error rate is also larger; Work as K
2when≤0.5, described relation curve levels off to linearity curve, and now the papr range of decrease of this communication signal is less, but error rate is also less.Therefore, can parameters K according to actual needs
1and K
2value, to reach desirable effect.
First computing module 26 is for basis component X in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '.In the present embodiment, described compressing and converting function is X
u '=K
1* erf (K
2* X
u), Y
u '=K
1* erf (K
2* Y
u).Wherein, erf represents error function, also referred to as Gauss error function.Specifically, the first computing module 26 first controls multiplier 602 calculating K respectively
2* X
uwith K
2* Y
u, then control integrator 604 and calculate erf (K
2* X
u) and erf (K
2* Y
u), finally control multiplier 602 by K
1respectively with erf (K
2* X
u), erf (K
2* Y
u) be multiplied, obtain X
u 'with Y
u 'value.
The X of component in the same way that first synthesis module 28 calculates for basis
u 'and quadrature component Y
u ', the communication signal after synthesis compression.The amplitude β of the communication signal after this compression
u=
, by compressing component X in the same way
uwith quadrature component Y
u, thus have compressed the amplitude of this communication signal, therefore can reduce the papr of this communication signal.In the present embodiment, the communication signal after this compression is sending to receiving terminal 4 after analog-to-digital conversion and power amplifier.
Consulting shown in Fig. 5, is the functional block diagram of the preferred embodiment of expander in the present invention.Expander 40 comprises the second acquisition module 42, second and arranges module 44, second computing module 46 and the second synthesis module 48.Wherein also comprise integrator 604 and divider 606 in the second computing module 46.
Second acquisition module 42 carries out resolution of vectors for the communication signal that will receive, and obtains component X in the same way
u "and quadrature component Y
u ".In the present embodiment, this communication signal received is receive and the communication signal obtained after digital-to-analogue conversion at the receiving terminal 4 of multicarrier communication system 10.
Second arranges module 44 for reading set parameter K
1and K
2.To in the transmission of same communication signal and receiving course, second arranges the parameter K that module 44 reads
1and K
2be the parameter K that first arranges module 24 setting
1and K
2.
Second computing module 46 is for basis component X in the same way
u ", quadrature component Y
u ", parameter K
1, parameter K
2and the inverse function of compressing and converting function calculates the X of component in the same way after expanding
uand quadrature component Y
u.In the present embodiment, the inverse function of described compressing and converting function is X
u=1/K
2* erfinv (X
u "/ K
1), Y
u=1/K
2* erfinv (Y
u "/ K
1).Wherein, erfinv represents anti-error function, i.e. the inverse function of error function.Specifically, the second computing module 46 first controls divider 606 and calculates X respectively
u "/ K
1with Y
u "/ K
1, then control integrator 604 and calculate erfinv (X
u "/ K
1) and erfinv (Y
u "/ K
1), finally control divider 606 by erfinv (X
u "/ K
1) and erfinv (Y
u "/ K
1) respectively divided by K
2, obtain X
uwith Y
uvalue.
The X of component in the same way that second synthesis module 48 calculates for basis
uand quadrature component Y
u, the communication signal after synthesis expansion.In the present embodiment, the communication signal after this expansion is at restoring data after discrete Fourier transform (DFT), serioparallel exchange, Xie Zhanpin, demapping process.
Consulting shown in Fig. 6, is the flow chart that the present invention reduces the compression process of the method preferred embodiment of papr.
Step S12, communication signal is carried out resolution of vectors by the first acquisition module 22, obtains component X in the same way
uwith quadrature component Y
u.Described resolution of vectors communication signal is decomposed into frequency is identical, peak amplitude is identical but two signal components of phase 90, usually adopts a sinusoidal signal to describe component X in the same way
u, adopt a cosine signal to describe quadrature component Y
u.The amplitude ρ of this communication signal
u=
.
Step S14, first arranges the parameter K that module 24 arranges this communication signal of compression
1and K
2.Wherein, parameter K
1for allowing the absolute value of signal component maximum occurrences upon compression, parameter K
2for the constant that the amplitude compressed according to actual needs is arranged, and parameter K
1and K
2be arithmetic number.
Step S16, the first computing module 26 is according to component X in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '.In the present embodiment, described compressing and converting function is X
u '=K
1* erf (K
2* X
u), Y
u '=K
1* erf (K
2* Y
u).Specifically, the first computing module 26 first controls multiplier 602 calculating K respectively
2* X
uwith K
2* Y
u, then control integrator 604 and calculate erf (K
2* X
u) and erf (K
2* Y
u), finally control multiplier 602 by K
1respectively with erf (K
2* X
u), erf (K
2* Y
u) be multiplied, obtain X
u 'with Y
u 'value.
Step S18, the first synthesis module 28 is according to the X of component in the same way calculated
u 'and quadrature component Y
u ', the communication signal after synthesis compression.The amplitude β of the communication signal after this compression
u=
, by compressing component X in the same way
uwith quadrature component Y
u, thus have compressed the amplitude of this communication signal, therefore can reduce the papr of this communication signal.
Consulting shown in Fig. 7, is the flow chart that the present invention reduces the process of expansion of the method preferred embodiment of papr.
Step S22, the communication signal received is carried out resolution of vectors by the second acquisition module 42, obtains component X in the same way
u "and quadrature component Y
u ".
Step S24, second arranges module 44 reads set parameter K
1and K
2.To in the transmission of same communication signal and receiving course, second arranges the parameter K that module 44 reads
1and K
2be the parameter K that first arranges module 24 setting
1and K
2.
Step S26, the second computing module 46 is for basis component X in the same way
u ", quadrature component Y
u ", parameter K
1, parameter K
2and the inverse function of compressing and converting function calculates the X of component in the same way after expanding
uand quadrature component Y
u.In the present embodiment, the inverse function of described compressing and converting function is X
u=1/K
2* erfinv (X
u "/ K
1), Y
u=1/K
2* erfinv (Y
u "/ K
1).Specifically, the second computing module 46 first controls divider 606 and calculates X respectively
u "/ K
1with Y
u "/ K
1, then control integrator 604 and calculate erfinv (X
u "/ K
1) and erfinv (Y
u "/ K
1), finally control divider 606 by erfinv (X
u "/ K
1) and erfinv (Y
u "/ K
1) respectively divided by K
2, obtain X
uwith Y
uvalue.
Step S28, the second synthesis module 48 is according to the X of component in the same way calculated
uand quadrature component Y
u, the communication signal after synthesis expansion.
Consulting shown in Fig. 8-9, is complementary Cumulative Distribution Function (ComplementaryCumulativeDistributionFunction, CCDF) the performance schematic diagram of communication signal under simulation different condition.Described CCDF represents that papr PAPR exceedes threshold value PAPR
0probability.
Wherein, the simulated conditions in Fig. 8 are: bit transfer rate (R
b) be 100kbps, exhibition gain frequently (SF) is 8, and sub-carrier number (U) is 128, parameter K
1be 24, parameter K
2be 0.04, the peak swing (A of each communication signal sent
ρ max) be 50, the mean value (A of each communication signal amplitude sent
ρ av) be 14, power amplifier inoperation patient maximum input amplitude value (A between inelastic region
pA max) be 34.Simulated conditions in Fig. 9 are: bit transfer rate is 100kbps, and exhibition gain is frequently 16, and sub-carrier number is 256, parameter K
1be 39, parameter K
2be 0.025, the peak swing of each communication signal sent is 70, and the mean value of each communication signal amplitude sent is 20, and power amplifier inoperation patient maximum input amplitude value between inelastic region is 52.
Visible, the present invention reduces the method (this method) of papr relative to the method (former method) originally not adopting compressor reducer 20 and expander 40 pairs of communication signals to compress and expand, and papr PAPR exceedes threshold value PAPR
0probability low, namely this method effectively can reduce the reduction papr of communication signal, reduce distorted signals.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.
Claims (8)
1. reduce a method for papr, it is characterized in that, the method comprising the steps of:
Communication signal is carried out resolution of vectors, obtains component X in the same way
uwith quadrature component Y
u;
The parameter K compressing described communication signal is set
1and K
2, wherein said parameter K
1for component X in the same way described in allowing
uwith quadrature component Y
uthe absolute value of maximum occurrences upon compression, described parameter K
2for the constant that the amplitude compressed as required is arranged;
According to the described X of component in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '; And
According to the X of component in the same way calculated
u 'and quadrature component Y
u ', the communication signal after synthesis compression.
2. the method reducing papr as claimed in claim 1, it is characterized in that, described compressing and converting function is X
u '=K
1* erf (K
2* X
u), Y
u '=K
1* erf (K
2* Y
u).
3. the method reducing papr as claimed in claim 1, it is characterized in that, the method also comprises step:
The communication signal received is carried out resolution of vectors, obtains component X in the same way
u "and quadrature component Y
u ";
Parameter K set by reading
1and K
2;
According to the described X of component in the same way
u ", quadrature component Y
u ", parameter K
1, parameter K
2and the inverse function of compressing and converting function calculates the X of component in the same way after expanding
uand quadrature component Y
u; And
According to the X of component in the same way calculated
uand quadrature component Y
u, the communication signal after synthesis expansion.
4. the method reducing papr as claimed in claim 3, it is characterized in that, the inverse function of described compressing and converting function is X
u=1/K
2* erfinv (X
u "/ K
1), Y
u=1/K
2* erfinv (Y
u "/ K
1).
5. reduce a device for papr, it is characterized in that, this device comprises:
First acquisition module, for communication signal is carried out resolution of vectors, obtains component X in the same way
uwith quadrature component Y
u;
First arranges module, for arranging the parameter K compressing described communication signal
1and K
2, wherein said parameter K
1for component X in the same way described in allowing
uwith quadrature component Y
uthe absolute value of maximum occurrences upon compression, described parameter K
2for the constant that the amplitude compressed as required is arranged;
First computing module, for according to the described X of component in the same way
u, quadrature component Y
u, parameter K
1, parameter K
2and compressing and converting function calculates the X of component in the same way after compressing
u 'and quadrature component Y
u '; And
First synthesis module, for the X of component in the same way that basis calculates
u 'and quadrature component Y
u ', the communication signal after synthesis compression.
6. the device reducing papr as claimed in claim 5, it is characterized in that, described compressing and converting function is X
u '=K
1* erf (K
2* X
u), Y
u '=K
1* erf (K
2* Y
u).
7. the device reducing papr as claimed in claim 5, it is characterized in that, this device also comprises:
Second acquisition module, carries out resolution of vectors for the communication signal that will receive, and obtains component X in the same way
u "and quadrature component Y
u ";
Second arranges module, for reading set parameter K
1and K
2;
Second computing module, for according to the described X of component in the same way
u ", quadrature component Y
u ", parameter K
1, parameter K
2and the inverse function of compressing and converting function calculates the X of component in the same way after expanding
uand quadrature component Y
u; And
Second synthesis module, for the X of component in the same way that basis calculates
uand quadrature component Y
u, the communication signal after synthesis expansion.
8. the device reducing papr as claimed in claim 7, it is characterized in that, the inverse function of described compressing and converting function is X
u=1/K
2* erfinv (X
u "/ K
1), Y
u=1/K
2* erfinv (Y
u "/ K
1).
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|---|---|---|---|
| CN201410423247.4A CN105450571A (en) | 2014-08-26 | 2014-08-26 | Method and device for reducing peak to average power ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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ID=55560360
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6314146B1 (en) * | 1998-06-05 | 2001-11-06 | The Board Of Trustees Of The Leland Stanford Junior University | Peak to average power ratio reduction |
| CN1392690A (en) * | 2002-08-01 | 2003-01-22 | 上海交通大学 | Amplitude compressino and expansion control method for peak-to-average ratio of orthogonal frequency division multi-plexing communication system |
| CN101789924A (en) * | 2009-12-31 | 2010-07-28 | 北京北方烽火科技有限公司 | Peak to average power ratio restraint method and system |
-
2014
- 2014-08-26 CN CN201410423247.4A patent/CN105450571A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6314146B1 (en) * | 1998-06-05 | 2001-11-06 | The Board Of Trustees Of The Leland Stanford Junior University | Peak to average power ratio reduction |
| CN1392690A (en) * | 2002-08-01 | 2003-01-22 | 上海交通大学 | Amplitude compressino and expansion control method for peak-to-average ratio of orthogonal frequency division multi-plexing communication system |
| CN101789924A (en) * | 2009-12-31 | 2010-07-28 | 北京北方烽火科技有限公司 | Peak to average power ratio restraint method and system |
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Application publication date: 20160330 |