CN102624665A - Method for reducing peak to average power ratio (PAPR) of multi-carrier communication signals - Google Patents

Method for reducing peak to average power ratio (PAPR) of multi-carrier communication signals Download PDF

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CN102624665A
CN102624665A CN2012100535888A CN201210053588A CN102624665A CN 102624665 A CN102624665 A CN 102624665A CN 2012100535888 A CN2012100535888 A CN 2012100535888A CN 201210053588 A CN201210053588 A CN 201210053588A CN 102624665 A CN102624665 A CN 102624665A
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papr
phase
reversing
code word
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CN102624665B (en
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屈代明
李立
江涛
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Huazhong University of Science and Technology
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Abstract

A method for reducing a peak to average power ratio (PAPR) of multi-carrier communication signals belongs to the technical field of communication utilizing the multi-carrier communication signals and particularly relates to wireless multi-carrier communication which is combined with a low density parity check (LDPC) code to reduce the PAPR of the multi-carrier communication signals. The method includes firstly, proposing an LDPC code of a special structure and a reversible subset LDPC (NS-LDPC) code; then proposing a method to subject a reversible subset of the NS-LDPC code to reverse operating so that the PAPR of the multi-carrier communication signals can be effectively reduced. According to the method for reducing the PAPR of the multi-carrier communication signals, the PAPR of the multi-carrier communication signals can be effectively reduced, and bit error ratio performance and a data transfer rate of a system can hardly be affected.

Description

A kind of method that reduces multi-carrier communications signals PAPR
Technical field
The invention belongs to communication technical field; Relate in particular to wireless multi-carrier communications; Like wireless OFDM (OFDM) communication, be specifically related to a kind of method that reduces multi-carrier communications signals PAPR, this method is through using the subclass LDPC that can reverse; Be the NS-LDPC sign indicating number, realize that it reduces the function of multi-carrier communications signals PAPR.
Background technology
The multi-carrier communication technology, especially OFDM (OFDM) communication technology is widely used in the radio communication.A remarkable shortcoming of multi-carrier communication is that multi-carrier communications signals has higher peak value and average power ratio, is called for short peak-to-average power ratio (PAPR).Higher PAPR requires modules such as communication system intermediate power amplifier, digital to analog converter to have bigger linear dynamic range, otherwise can cause inband signaling distortion and out of band spectrum to be revealed, and causes the ofdm system performance to decline to a great extent.At present, the method for reduction multi-carrier communications signals PAPR mainly comprises:
(1) cuts ripple method (Clipping and Filtering), sees L.Wang and C.Tellambura, " A simplified clipping and filtering technique for PAR reduction in OFDM systems; " IEEE Signal Processing Letters, vol.12, no.6; Pp.453-456; Jun.2005 cuts the ripple method and at first amplitude in the ofdm signal is sheared above the peak signal of predetermined threshold value, again through filter filtering out-of-band radiation.This method can directly effectively reduce the PAPR of ofdm signal, can't eliminate yet cut the inband distortion that the ripple method causes, this can cause error rate of system to increase.
(2) partial transmission sequence (Partial Transmit Sequence) is seen L.J.Cimini, Jr.and N.R.Sollenberger; " Peak-to-average power ratio reduction of an OFDM signal using partial transmit sequences; " IEEE Communications Letters, vol.4, no.3; Pp.86-88; Mar.2000, the basic thought of partial transmission sequence method are with being divided into several disjoint sub-blocks through the data block after coding, the mapping according to certain rule, then each sub-block being multiply by suitable phase rotation coefficient and reduce PAPR.It is remarkable that this method reduces the PAPR effect; And signal is not produced distortion; Yet receiving terminal is correct restore data when known phase information only, can access correct phase information in order to guarantee receiving terminal, needs that phase information is increased additional bits and protect; And then sending to receiving terminal as side information, this can cause the system data transfer rate to reduce.
(3) coding method (Coding scheme) is seen M.Sabbaghian, Y.Kwak; B.Smida, and V.Tarokh, " Near Shannon limit and low peak to average power ratio turbo block coded OFDM; " IEEE Trans, Commun., vol.59; No.8, pp.2042-2045, Aug.2011; This method is to adopting Turbo block code (TBC) coded OFDM system, and the frequency domain components sign indicating number that concrete implementation is the Turbo block code adopts the Reed-Muller sign indicating number with excellent PAPR performance, and the time domain component code then adopts the low-density parity check code (LDPC) with excellent error-correcting performance; This method can obtain good error-correcting performance when reducing PAPR; Yet along with the increase of code length, PAPR reduces deleterious, and bit error rate performance and similarity condition adopt the LDPC sign indicating number to carry out error correction down separately to compare still and lose more than the 1dB.
In sum, the shortcoming of the method for current reduction multi-carrier communications signals PAPR comprises: error rate of system increases or the system data transfer rate descends, and the present invention proposes for overcoming the above problems exactly.
Summary of the invention
To multi-carrier communications signals because high PAPR; Thereby cause communication system intermediate power amplifier linear dynamic range to be had relatively high expectations or send distorted signals; And the method for existing reduction multi-carrier communications signals PAPR exists degradation shortcoming under error rate of system increase or the system data transfer rate; The present invention proposes a kind of method that reduces multi-carrier communications signals PAPR; This method can significantly reduce multi-carrier signal PAPR under the situation of loss system performance (comprising error rate of system and system data transfer rate) hardly.
A kind of method that reduces multi-carrier communications signals PAPR provided by the invention; It is characterized in that; This method utilizes the NS-LDPC sign indicating number to reduce multi-carrier communications signals PAPR, and the NS-LDPC sign indicating number is a kind of LDPC sign indicating number with at least one subclass of can reversing, and these can reverse between the subclass less than occuring simultaneously;
The said subclass of reversing is defined as the set of some coded-bits of LDPC sign indicating number, and this gathers the set of variables corresponding node on the corresponding Tanner figure, and satisfying each check-node all has even number of edges to be connected with each subclass of can reversing, and comprises that 0 limit connects; And in the coded-bit set of each subclass of can reversing a bit being arranged is phase bits, and phase bits is fixed as 0 when coding.
The NS-LDPC sign indicating number that the present invention proposes is a kind of LDPC sign indicating number with special construction; It has the individual subclass of reversing of M (M >=1); And to any NS-LDPC code word; But all bits that one or more inverted rotor set pairs that reverse are simultaneously answered, the new code word of formation remains a legal-code of this NS-LDPC sign indicating number.Thereby for the multi-carrier communications systems that adopts the NS-LDPC sign indicating number, transmitting terminal can change the code word of selecting in the code word to have minimum PAPR in the 2M kind and send through the subclass of can reversing is carried out reverse turn operation independently, can effectively reduce multi-carrier signal PAPR like this.On the one hand, NS-LDPC belongs to a kind of of LDPC sign indicating number, and it has and the general consistent error-correcting performance of LDPC sign indicating number; On the other hand; But inverted rotor is concentrated and to be remained with 1 bit and indicate corresponding reversed subclass whether counter-rotating has taken place as phase bits; Can recover this phase bits through decoding; And then the recovering information bit, thereby do not need transmitted sideband information, can not cause that the system data transfer rate descends because of transmitted sideband information.The method that the employing NS-LDPC sign indicating number that the present invention proposes reduces multi-carrier communications signals PAPR can significantly reduce multi-carrier signal PAPR under the situation of loss system performance hardly, can be applicable to adopt the various communication systems of multi-transceiver technology.
Description of drawings
Fig. 1 is the Tanner figure of LDPC sign indicating number;
Fig. 2 uses the transmitter block diagram that the NS-LDPC sign indicating number reduces multi-carrier signal PAPR;
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, the LDPC sign indicating number can scheme to represent that the node of top is a variable node among the figure with Tanner, and corresponding coded-bit comprises information bit and check bit, and the node of below is a check-node, and the connection between variable node and the check-node is called the limit.
The NS-LDPC sign indicating number is a kind of LDPC sign indicating number, but has following particular structure:
(1) NS-LDPC has at least one subclass of can reversing, and these can reverse between the subclass less than occuring simultaneously.The said subclass of reversing is defined as the set (set of relevant variable node among the corresponding Tanner figure) of some coded-bits of LDPC sign indicating number, and satisfying each check-node all has even number of edges to be connected (comprising that 0 limit connects) with each subclass of can reversing.
(2) in the set of the coded-bit of each subclass of can reversing a bit being arranged is phase bits, and phase bits is fixed as 0 when coding.
Because each check-node had even number of edges to be connected with each subclass of can reversing during the Tanner that the NS-LDPC sign indicating number is corresponding schemed; The NS-LDPC sign indicating number has the character of following uniqueness: to any code word; But all bits that one or more inverted rotor set pairs that reverse are simultaneously answered; The new code word that forms remains a legal-code of this NS-LDPC sign indicating number.Said counter-rotating is meant bit 0 is become bit 1, perhaps bit 1 become bit 0.
A bit is arranged is phase bits because but each inverted rotor is concentrated, and when coding, is fixed as 0, so phase bits can be used for indicating corresponding the reversed subclass of NS-LDPC sign indicating number whether counter-rotating has taken place.If certain the reversed subclass in the NS-LDPC sign indicating number has been carried out reverse turn operation, then its corresponding phase bits becomes 1; If certain the reversed subclass in the NS-LDPC sign indicating number is not carried out reverse turn operation, then corresponding phase bits still is 0.Phase bits in that receiving terminal can utilize decoding to obtain judges whether its corresponding reversed subclass counter-rotating has taken place, thus correct recovering information bit.
As shown in Figure 2, the method that the present invention proposes NS-LDPC is used to reduce multi-carrier communications systems PAPR comprises following process:
(1) NS-LDPC coding step:
According to predefined M value; Structure has the corresponding Tanner figure of NS-LDPC sign indicating number of M the subclass of can reversing; Satisfying each check-node has even number of edges to be connected with each subclass of can reversing; The Tanner that obtains according to structure schemes, and input information bits is encoded obtains coded-bit set V, and wherein coded-bit set V comprises M the subclass { V that can reverse 1, V 2..., V MAnd 1 subclass V that can not reverse 0, and but the phase bits that each inverted rotor is concentrated all is fixed as 0 when coding, claim that the code word of this moment is an original code word.Said M is more than or equal to 1, and smaller or equal to the positive integer of code length, the effect of the big more reduction of M value PAPR is good more, but implementation complexity also can correspondingly increase, and can set suitable M value according to actual demand.
(2) phase place initialization step:
Whether each subclass of can reversing is reversed and is referred to as phase place, and phase place is that 0 expression is nonreversible, and phase place is 1 expression counter-rotating.Owing to comprise M the subclass of can reversing in the NS-LDPC sign indicating number, so need M phase place.
When the phase place initialization, produce earlier M phase place and be 0 phase combination, with this as current phase combination;
Through changing the one or more phase values in the phase combination, can produce 2 altogether MPlant the different phase combination.
(3) reverse turn operation step:
Respectively each subclass of can reversing in the NS-LDPC sign indicating number is carried out reverse turn operation independently according to current phase combination, claim to be the variation code word through the code word of reverse turn operation.Obviously, to binary system LDPC sign indicating number,, reverse turn operation carries out XOR but being equivalent to the bit phase place corresponding with this subclass that inverted rotor is concentrated.The subclass of can not reversing V 0In bit then do not participate in reverse turn operation.
(4) multi-carrier modulation step:
Successively to the current variation code word that obtains interweave, sign map, multi-carrier modulation, obtained a multi-carrier signal like this;
(5) the PAPR value and the record of the current phase combination multi-carrier signal of calculating.
Whether the sum of (6) judging the phase combination produced equals 2 M, if, get into step (7), otherwise, change the one or more phase values in the current phase combination arbitrarily, with form one with all phase combination phase combination all inequality that has produced, as new current phase combination, go to step (3) then;
(7) relatively write down 2 MPlant the PAPR value of phase combination multi-carrier signal, select to make the minimum phase combination of multi-carrier signal PAPR to make up, and claim that variation code word corresponding under the optimum angle combination is for sending code word as optimum angle.Send code word through interweaving, finally after the sign map, multi-carrier modulation going out through antenna transmission.
Instance:
Embodiment is the multicarrier system that 1024 number of sub-carrier are arranged, and wherein the sign map mode adopts the BPSK mapping mode, is about to bit 0 and is mapped as symbol+1, and bit 1 is mapped as symbol-1.Each multicarrier symbol of this system can transmit 1024 coded-bits.The time-domain signal of each multicarrier symbol is obtained by the stack of the bpsk signal on this 1024 number of sub-carrier, has very high PAPR.
Code length of transmitting terminal employing is 1024 NS-LDPC sign indicating number among the embodiment, and obviously sending this yard code word needs 1024 BPSK symbols.This sign indicating number comprises M=3 subclass: the V that can reverse 1, V 2And V 3, their corresponding phase bits nodes are designated as b 1, b 2And b 3Each subclass of can reversing comprises 256 coded-bits.Also have 256 bits outside the subclass of can reversing, the subclass of promptly can not reversing, these bits are not participate in reverse turn operation.
(1) structure has the corresponding Tanner figure of NS-LDPC sign indicating number of 3 subclass of can reversing, and according to constructing the Tanner figure that obtains, input information bits is encoded obtains coded-bit set V, and code length is 1024, and it comprises 3 subclass: V that can reverse 1, V 2, V 3And 1 subclass V that can not reverse 0The phase place initialization step:
(2) whether each subclass of can reversing is reversed and is referred to as phase place, and phase place is that 0 expression is nonreversible, and phase place is 1 expression counter-rotating.Owing to comprise 3 subclass of can reversing in the NS-LDPC sign indicating number among the embodiment, need 3 phase places.
When the phase place initialization, produce earlier 3 phase places and be 0 phase combination, with this as current phase combination;
Through changing the one or more phase values in the phase combination, can produce 2 altogether 3=8 kinds of different phase combinations.
(3) the current phase combination of foundation is respectively to the subclass V that can reverse in the NS-LDPC sign indicating number 1, V 2And V 3Carry out reverse turn operation independently, claim to be the variation code word through the code word of reverse turn operation.Obviously, to binary system LDPC sign indicating number,, reverse turn operation carries out XOR but being equivalent to the bit phase place corresponding with this subclass that inverted rotor is concentrated.The subclass of can not reversing V 0In bit then do not participate in reverse turn operation.
(4) successively to the current variation code word that obtains interweave, sign map, multi-carrier modulation, obtained a multi-carrier signal like this;
(5) the PAPR value and the record of the current phase combination multi-carrier signal of calculating.
Whether the sum of (6) judging the phase combination produced equals 8; If, get into step (7), otherwise; Change the one or more phase values in the current phase combination arbitrarily; With form one with all phase combination phase combination all inequality that has produced, as new current phase combination, go to step (3) then;
The PAPR value of 8 kinds of phase combination multi-carrier signals that (7) relatively write down selects to make the minimum phase combination of multi-carrier signal PAPR to make up as optimum angle, and claims that the corresponding down variation code word of optimum angle combination is for sending code word.Send code word through interweaving, finally after the sign map, multi-carrier modulation going out through antenna transmission.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (2)

1. method that reduces multi-carrier communications signals PAPR; It is characterized in that; This method utilizes the NS-LDPC sign indicating number to reduce multi-carrier communications signals PAPR, and the NS-LDPC sign indicating number is a kind of LDPC sign indicating number with at least one subclass of can reversing, and these can reverse between the subclass less than occuring simultaneously;
The said subclass of reversing is defined as the set of some coded-bits of LDPC sign indicating number, and this gathers the set of variables corresponding node on the corresponding Tanner figure, and satisfying each check-node all has even number of edges to be connected with each subclass of can reversing, and comprises that 0 limit connects; And in the coded-bit set of each subclass of can reversing a bit being arranged is phase bits, and phase bits is fixed as 0 when coding.
2. the method for reduction multi-carrier communications signals PAPR according to claim 1 is characterized in that this method specifically comprises the steps:
(1) NS-LDPC coding step:
According to predefined M value; Structure has the corresponding Tanner figure of NS-LDPC sign indicating number of M the subclass of can reversing; Satisfying each check-node has even number of edges to be connected with each subclass of can reversing; The Tanner that obtains according to structure schemes, and input information bits is encoded obtains coded-bit set V, and wherein coded-bit set V comprises M the subclass { V that can reverse 1, V 2..., V MAnd 1 subclass V that can not reverse 0, and but the phase bits that each inverted rotor is concentrated all is fixed as 0 when coding, claim that the code word of this moment is an original code word; Said M is more than or equal to 1, and smaller or equal to the positive integer of code length;
(2) phase place initialization step:
Whether each subclass of can reversing is reversed and is referred to as phase place, and phase place is that 0 expression is nonreversible, and phase place is 1 expression counter-rotating; When the phase place initialization, produce earlier M phase place and be 0 phase combination, with this as current phase combination;
(3) reverse turn operation step:
Respectively each subclass of can reversing in the NS-LDPC sign indicating number is carried out reverse turn operation independently according to current phase combination, claim to be the variation code word through the code word of reverse turn operation;
(4) multi-carrier modulation step:
Successively to the current variation code word that obtains interweave, sign map, multi-carrier modulation, obtain a multi-carrier signal;
(5) the PAPR value and the record of the current phase combination multi-carrier signal of calculating;
Whether the sum of (6) judging the phase combination produced equals 2 M, if, get into step (7), otherwise, change the one or more phase values in the current phase combination arbitrarily, with form one with all phase combination phase combination all inequality that has produced, as new current phase combination, go to step (3) then;
(7) relatively write down 2 MPlant the PAPR value of phase combination multi-carrier signal, select to make the minimum phase combination of multi-carrier signal PAPR to make up, and claim that variation code word corresponding under the optimum angle combination is for sending code word as optimum angle; Send code word through interweaving, finally after the sign map, multi-carrier modulation going out through antenna transmission.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102916923A (en) * 2012-10-11 2013-02-06 华中科技大学 Information transmission method capable of reducing PAPR of multicarrier system
CN103595681A (en) * 2013-11-01 2014-02-19 华中科技大学 Method for lowering PAPR of multi-carrier communication signal
CN105743835A (en) * 2016-04-18 2016-07-06 华中科技大学 Method for reducing peak-to-average power ratio of OFDMA system signal
CN105991506A (en) * 2015-03-06 2016-10-05 富士通株式会社 Information transmission device, information detection device, and transmitter

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WO2007090472A1 (en) * 2006-02-06 2007-08-16 Nokia Siemens Networks Gmbh & Co. Kg A method for reducing peak-to-average power ratio in an ofdm transmission system
CN101958873A (en) * 2010-10-11 2011-01-26 华中科技大学 Information transmission method for reducing peak to average power ratio of orthogonal frequency division multiplexing signal
CN102238129A (en) * 2011-08-02 2011-11-09 韩山师范学院 Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal

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WO2007090472A1 (en) * 2006-02-06 2007-08-16 Nokia Siemens Networks Gmbh & Co. Kg A method for reducing peak-to-average power ratio in an ofdm transmission system
CN101958873A (en) * 2010-10-11 2011-01-26 华中科技大学 Information transmission method for reducing peak to average power ratio of orthogonal frequency division multiplexing signal
CN102238129A (en) * 2011-08-02 2011-11-09 韩山师范学院 Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102916923A (en) * 2012-10-11 2013-02-06 华中科技大学 Information transmission method capable of reducing PAPR of multicarrier system
CN102916923B (en) * 2012-10-11 2015-07-22 华中科技大学 Information transmission method capable of reducing PAPR of multicarrier system
CN103595681A (en) * 2013-11-01 2014-02-19 华中科技大学 Method for lowering PAPR of multi-carrier communication signal
CN105991506A (en) * 2015-03-06 2016-10-05 富士通株式会社 Information transmission device, information detection device, and transmitter
CN105991506B (en) * 2015-03-06 2019-02-22 富士通株式会社 Information carrying means, information detector and transmitter
CN105743835A (en) * 2016-04-18 2016-07-06 华中科技大学 Method for reducing peak-to-average power ratio of OFDMA system signal
CN105743835B (en) * 2016-04-18 2018-12-07 华中科技大学 A method of reducing OFDMA system signal peak-to-average power power ratio

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