CN1885843A - Apparatus and method for reducing peak-to-average ratio of multi-carrier system based on multiband filter bank - Google Patents
Apparatus and method for reducing peak-to-average ratio of multi-carrier system based on multiband filter bank Download PDFInfo
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- CN1885843A CN1885843A CN 200510026963 CN200510026963A CN1885843A CN 1885843 A CN1885843 A CN 1885843A CN 200510026963 CN200510026963 CN 200510026963 CN 200510026963 A CN200510026963 A CN 200510026963A CN 1885843 A CN1885843 A CN 1885843A
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Abstract
The presented method comprises: on transmitter end, taking linear transformation, such as DFT or IDFT, to the serial-to-parallel data, and then letting the modulated signal on sub-carrier of multi-carrier transmission signal have some correlation, then reduces the peak-mean rate of multi-carrier transmitter based on MBFB.
Description
Technical field
The present invention relates to the multicarrier lift-off technology, more specifically, relate to the apparatus and method that in based on the multicarrier transmitter of many band filters group, reduce peak-to-average force ratio.
Background technology
In recent years, wireless communication system develops rapidly towards the broadband direction; Be accompanied by this development trend, the bandwidth that the wireless communication system single channel occupies is more and more higher, the also sustainable growth of the complexity of wireless receiver, and implementation complexity is more and more higher.Simultaneously, according to discovering in recent years, for the throughput of effective elevator system, the combination multiple access technology of frequency division multiple access technology (FDMA) and tdma (TDMA) will become the main multiple access technology of future mobile.Based on such technical need, multi-carrier modulation technology is subjected to academia and industrial quarters is more and more paid close attention to, and on the one hand, based on multi-carrier modulation technology, the complexity of receiver can be simplified greatly; On the other hand,, the mixing multiple access technology of FDMA and TDMA be can realize at an easy rate, the optimization and the enhancing of power system capacity are convenient to very much based on multi-transceiver technology.
Under present condition, realize that the means of multi-carrier modulation technology mainly contain two kinds: a kind of is that the basis is expanded accordingly with orthogonal frequency division multiplexi (OFDM), to form the multiple access scheme; Another is that the basis is expanded accordingly with many band filters group (MBFB), thereby forms the multiple access scheme.Content described in the invention mainly is power peak-to-average force ratio (PAPR) problem at the latter, proposes a kind of comparatively effectively control mode.
Multi-carrier modulation technology based on many band filters group will inevitably run into the PAPR problem in application process, when especially the number of sub-bands that adopts simultaneously in same terminal was big, the PAPR problem was even more serious, has seriously influenced power amplification efficiency.Especially when the modulation technique of many band filters group is applied in the portable terminal transmitter, will directly cause the reduction of useful signal covering level, and the shortening of power source life, performance index descend greatly.For this reason, must carry out effective PAPR control, just can make this specific multi-carrier modulation technology move towards practical.
In order to reduce the peak-to-average force ratio of multi-carrier modulation technology, solution commonly used has slicing method, compiling method and probabilistic method three class methods.The slicing method is the simplest, but when the peak-to-average force ratio of the relative original signal of slicing thresholding hangs down, the performance of system will obviously worsen.The signal code collection that compiling method can be used for transmitting by restriction promptly only transmits the code word of amplitude peak less than a certain given threshold value, thereby has reduced the peak value of transmission signals.Because the volume/decoding complexity of these class methods is quite high, thereby generally only be applicable to the multicarrier system that number of sub carrier wave is less.Probabilistic method mainly contains partial transmission sequence (PTS) and selectivity mapping (SLM) two kinds, and these class methods are by the symbol sebolic addressing before the multi-carrier modulation is carried out linear transformation, thereby make the peak value that has low probability through the symbol sebolic addressing after the multi-carrier modulation.The shortcoming of these class methods also is that computation complexity is very high.
The present invention proposes in order to solve the above-mentioned problems in the prior art just.
Summary of the invention
The present invention proposes a kind of by linear transformation, as Fourier transform (DFT) or inverse Fourier transform (IDFT) etc., make in the multi-carrier transmission signal on each subcarrier certain correlation that has between the modulation signal, thereby reduce devices and methods therefor based on the multicarrier transmitter peak-to-average force ratio of many band filters group.
According to a first aspect of the invention, provide a kind of method that is used to reduce peak-to-average force ratio in the multi carrier transmitting apparatus based on many band filters group, it comprises the steps: the string character data sequence string of input and is converted to the parallel symbol sequence of blocks of data; Described parallel symbol sequence of blocks of data is carried out linear transformation by genesis sequence, generate symbol data piece sequence through linear transformation; Be mapped on the corresponding subchannel through the symbol of element in each symbol data piece of linear transformation described respectively, its sub-channels is arranged by its pairing frequency order.
According to a second aspect of the invention, a kind of device that is used to reduce peak-to-average force ratio in the multicarrier transmitter based on many band filters group is provided, it comprises: go here and there and conversion equipment for one, be used for the string character data sequence string that will import and change the parallel symbol sequence of blocks of data; A linear transformation device is used for described parallel data block sequence is carried out linear transformation by genesis sequence, generates the symbol data piece sequence through linear transformation; The forming filter of band more than group device, it comprises a plurality of subfilters, the respectively corresponding subchannel of described each subfilter, its sub-channels is arranged by its pairing frequency order, wherein, described each subfilter is respectively applied for the respective element sign map in the described process symbol data piece of linear transformation to corresponding subchannel.
According to a third aspect of the invention we, a kind of method that is used to receive the signal that peak-to-average force ratio reduced in the multicarrier receiver based on many band filters group is provided, it comprises the steps: to the subchannel map operation corresponding inverse operation of incoming symbol signal execution with transmitter terminal, to isolate the multipath symbols data sequence; To the linear transformation corresponding linear inverse transformation of described multipath symbols data sequence execution, to generate symbol data piece sequence through linear inversion with transmitter terminal; Described symbol data piece sequence through linear inversion undertaken by genesis sequence and go here and there conversion, with generation string character data sequence.
According to a forth aspect of the invention, the multicarrier receiver based on many band filters group that is used to receive the signal that peak-to-average force ratio reduced is provided, it comprises: a matched filter banks device, be used for to the subchannel map operation corresponding inverse operation of incoming symbol signal execution, to isolate the multipath symbols data sequence with transmitter terminal; A linear inversion device is used for to the linear transformation corresponding linear inverse transformation of described multipath symbols data sequence execution with transmitter terminal, to generate the symbol data piece sequence through linear inversion; One and go here and there conversion equipment, be used for described symbol data piece sequence through linear inversion being undertaken by genesis sequence and go here and there conversion, with generation string character data sequence.
Compared with prior art, utilize apparatus and method of the present invention, can obviously reduce multicarrier transmitter peak-to-average force ratio based on many band filters group.
By the content below in conjunction with the description of the drawings and claims, and along with understanding more comprehensively of the present invention, other purposes of the present invention and effect will become and know more and easy to understand.
Description of drawings
Describe the present invention the identical parts of wherein same or analogous Reference numeral representative with reference to the accompanying drawings.
Fig. 1 is the block diagram based on the multi-carrier radio transmitter of many band filters group that can reduce peak-to-average force ratio in mobile communications network of the embodiment according to the present invention;
Fig. 2 is the column vector symbol of element of FFT conversion output and the schematic diagram of two kinds of mapping modes between the subchannel;
Fig. 3 is the flow chart that is used to reduce the method for peak-to-average force ratio in the multi-carrier radio transmitter based on many band filters of mobile communications network according to the present invention;
Fig. 4 is the block diagram based on the multi-carrier-wave wireless receiver of many band filters that is used to receive the signal launched by transmitting set shown in Figure 1 in mobile communications network of the embodiment according to the present invention;
Fig. 5 for the embodiment according to the present invention mobile communications network based on the multi-carrier-wave wireless receiver of many band filters group in receive according to of the present invention and carry out the flow chart that peak-to-average force ratio reduces the method for the transmission signals of handling at transmitter terminal;
Fig. 6 and Fig. 7 are the chart of the peak-to-average force ratio CCDF (CCDF) that adopts the multicarrier system based on many band filters group of the present invention.
Embodiment
Below with reference to accompanying drawing, and in conjunction with specific embodiments the present invention is described in detail.Should be appreciated that the present invention is not limited to specific embodiment.
Fig. 1 is the block diagram of the multi-carrier radio transmitter of many band filters that can reduce peak-to-average force ratio in mobile communications network of an embodiment according to the present invention.Comprising a channel coding device 11, digital modulation device 12, string and conversion equipment 13, Fourier (DFT) converting means 14, forming filter group device 15, a RF converter plant 16 and a transmitting antenna 17.
Need to prove that the channel coding device shown in Fig. 1, digital modulation device, RF converter plant and transmitting antenna and this nothing of purpose direct relation of the present invention only as a preferred implementation, are described at this in the lump.
Suppose { a
k, k=0,1,2....} is the transmission message digit sequence of input transmitting set, comes transmitting set of the present invention is elaborated below with reference to Fig. 1:
Channel coding device 11 is used to adopt predetermined chnnel coding rule to come input data sequence { a
k, k=0,1, the 2....} chnnel coding is transformed into dateout sequence { b with it
k, k=0,1,2....}, the cascaded code that wherein said chnnel coding rule can adopt for example RS sign indicating number and convolution code to form, Turbo code, perhaps LDPC sign indicating number, the also adaptive coding scheme that can form for multiple technologies is as adaptive coding and modulating scheme (AMC);
Digital modulation device 12 is used for, for example according to the Gray coding criterion, the dot chart that will be mapped to modulation symbol through the data sequence of chnnel coding gets on, generate string character sequence through the digital modulation mapping, selected modulation system is determined by system design, can be defined as a kind of in BPSK, QPSK, the qam mode, also can be for according to the error rate with carry and disturb than adaptively selected multiple dynamic modulation mode.Through digital modulation device 12, input data sequence { b
k, k=0,1,2....} is transformed into output symbol sequence { d
k, k=0,1,2....};
Serial/parallel conversion equipment 13 is used for string character sequence that digital modulation mapping is obtained and is divided into a plurality of string character data blocks according to the size of thereafter FFT transformation matrix, and described a plurality of string character data blocks are gone here and there and conversion operations, to form corresponding a plurality of parallel symbol data block.Through serial/parallel conversion equipment 13, the string character sequence { d of input
k, k=0,1,2....} is transformed into a plurality of parallel symbol data piece { e
k, k=0,1,2....}, here, e
kRepresent a column vector that number of elements is the same with the FFT transform size;
Linear transformation device 14 is used for each the parallel symbol data block { e to input
k, k=0,1,2....} carries out linear transformation, to generate the parallel symbol data block { f through linear transformation
k, k=0,1,2, L}, described linear transformation is preferably orthogonal linear transformation, for example Fourier (DFT) or contrary Fourier (IDFT) conversion (preferably, can be realized by FFT conversion module or IFFT conversion module).。The size of the column vector of the wherein size of linear transformation, that is transformation matrix, it depends on subband (subchannel) number that transmits and take.
Many band forming filter group devices 15 are used for whole channel width is divided into the subchannel (or subband) of several mutually orthogonal (quasiorthogonal), corresponding subchannel of each subfilter in the bank of filters.Like this, the parallel symbol data block { f of process linear transformation gained
k, k=0,1,2, each symbol of element in the column vector of L} is mapped to respectively on the corresponding subchannel.Usually, the subfilter number can be much larger than the signal way of bank of filters input.Preferably, the subfilter number of bank of filters is that 2 integer power power (promptly get 2,4,8,16...) is individual; And the size of selection linear transformation makes that the subfilter number is the integral multiple of FFT transform size; Assurance simultaneously equally spaced is mapped on the subchannel of bank of filters by the subchannel sequence number respectively through each symbol of element in the column vector of the parallel symbol data block of linear transformation output.Fig. 2 shows through the column vector symbol of element of linear transformation output and two kinds of mapping modes between the bank of filters subfilter, wherein the subfilter number is 16, linear (for example FFT) transform size is 4 o'clock, as shown in Figure 2, as long as guarantee uniformly-spaced mapping, the column vector symbol of element and the mapping method between the bank of filters subfilter of FFT conversion output can be not unique.Behind signal shaping bank of filters shaping filter, the linear addition of the output signal of all subfilters forms one tunnel output signal.Through signal shaping filter apparatus 15, the symbol sebolic addressing { f of input
k, k=0,1,2, L} is transformed into output waveform sequence { i
k, k=0,1,2, L};
RF converting means 16 is used for the wave sequence { i through subchannel filtering mapping as the baseband signalling sequence
k, k=0,1,2, L} is transformed into radiofrequency signal, and is transmitted in the wireless channel via transmitting antenna module 17 and goes.
Preferably, transmitting set also comprises a control device 17 (for simplicity's sake, not shown in the drawings), is used to carry out following function:
1) adjusts the bandwidth of described subchannel according to the channel coherence bandwidth; With the number of adjusting described subchannel according to channel width.；
2) adjust the size of described linear transformation according to signal transmission rate, that is take the number of subchannel;
3) adjust according to channel quality described through the symbol of element in the symbol data piece of linear transformation and the mapping mode between the described subchannel.
Though with reference to Fig. 1 the multi-carrier radio transmitter based on many band filters group is described above, this only is clear for what describe.Should be appreciated that the present invention is claimed to be the device that is used to reduce peak-to-average force ratio a kind of in the multicarrier transmitter based on many band filters group, wherein said multicarrier transmitter can comprise wireless launcher or wired emitter.The described device that is used to reduce peak-to-average force ratio mainly comprises above-mentioned string and conversion equipment 13, linear transformation device 14 and is with forming filter group device 15 more.Preferably, also can comprise above-mentioned control device 17.
Fig. 3 show according to of the present invention mobile communications network based on the multi-carrier radio transmitter of many band filters group in can reduce the flow chart of the signal transmitting method of peak-to-average force ratio.
Need to prove, chnnel coding step shown in Fig. 3, digital modulation step, RF frequency conversion step and come step and this nothing of purpose direct relation of the present invention of emitting radio frequency signal via transmitting antenna, only, be described in the lump at this as a preferred implementation.
In step S101, adopt predetermined chnnel coding rule to come to input data sequence { a
k, k=0,1,2....} carries out chnnel coding, and it is transformed into the data sequence { b of process chnnel coding
k, k=0,1,2....}, the cascaded code that wherein said chnnel coding rule can adopt for example RS sign indicating number and convolution code to form, Turbo code, perhaps the LDPC sign indicating number also can be the adaptive coding scheme that multiple technologies are formed, as adaptive coding and modulating scheme (AMC), subsequently, enter step S102;
In step S102, for example according to the Gray coding criterion, will be through the data sequence { b of chnnel coding
k, k=0,1, the dot chart that 2....} is mapped to modulation symbol gets on, and generates the string character sequence { d through the digital modulation mapping
k, k=0,1,2....}, selected modulation system determines by system design, can be defined as a kind of in BPSK, QPSK, the qam mode, also can be for according to the error rate with carry and disturb than adaptively selected multiple dynamic modulation mode;
In step S103, digital modulation is shone upon the string character sequence { d that obtains
k, k=0,1,2....} goes here and there and conversion operations according to the size of thereafter FFT transformation matrix, to generate corresponding a plurality of parallel symbol data block { e
k, k=0,1,2....}, here, e
kRepresent a column vector that number of elements is the same with the FFT transform size, subsequently, enter step S104;
In step S104, be used for each parallel symbol data block { e to input
k, k=0,1,2....} carries out linear transformation, to generate the parallel symbol data block { f through linear transformation
k, k=0,1,2, L}, here, f
kAlso represent a number of elements and the equirotal column vector of linear transformation, described linear transformation is preferably orthogonal linear transformation, for example Fourier (DFT) conversion or contrary Fourier (IDFT) conversion (preferably, can realize) by FFT conversion module or IFFT conversion module.Wherein, the size of linear transformation, that is the size of the column vector of transformation matrix, it depends on subband (subchannel) number that transmits and take, and subsequently, enters step S105;
In step S105, will be through the parallel symbol data block { f of linear transformation gained
k, k=0,1,2, each symbol of element in the column vector of L} is mapped to respectively on the subchannel of a plurality of mutually orthogonal (quasiorthogonal).Usually, the number of subchannel can be much larger than the signal way of input.Preferably, the number of subchannel is that 2 integer power power (promptly get 2,4,8,16...) is individual; And, select the size of described linear transformation, make that the number of subchannel is the integral multiple of linear transformation size; Guarantee that simultaneously each symbol of element in the column vector of linear transformation output equally spaced is mapped on the subchannel of bank of filters according to the subchannel sequence number respectively.Fig. 2 example subchannel number be 16, linear transformation (for example FFT conversion) size is 4 o'clock, through the symbol of element in the column vector of the parallel symbol data block of linear transformation output and two kinds of mapping methods between the subchannel.As shown in the figure, as long as guarantee uniformly-spaced mapping, the column vector symbol of element and the mapping method between the subcarrier of FFT conversion output can be not unique.After subchannel filtering mapping, the linear addition of the output signal of all subchannels forms one tunnel output signal, thereby, the symbol sebolic addressing { f of input
k, k=0,1,2, L} is transformed into output waveform sequence { i
k, k=0,1,2, L};
In step S106, will be as the wave sequence { i through subchannel filtering mapping of baseband signalling sequence
k, k=0,1,2, the L} upward frequency conversion becomes radiofrequency signal;
Subsequently, at step S107, via the transmitting antenna module with emission of radio frequency signals in wireless channel.
Preferably, described method also comprises following controlled step:
1) adjusts the bandwidth of described subchannel according to the channel coherence bandwidth; With the number of adjusting described subchannel according to channel width.；
2) adjust the size of described linear transformation according to signal transmission rate, that is take the number of subchannel;
3) adjust according to channel quality described through the symbol of element in the symbol data piece of linear transformation and the mapping mode between the described subchannel.
Though above with reference to Fig. 3 in mobile communications network, being described based on the signal transmitting method in the multi-carrier radio transmitter of many band filters group, this only is clear for what describe.Should be appreciated that the present invention is claimed to be the method that is used to reduce peak-to-average force ratio a kind of in the multicarrier transmitter based on many band filters group, wherein, described multicarrier transmitter can comprise wireless launcher or wired emitter.The described method that is used to reduce peak-to-average force ratio mainly comprises above-mentioned steps S103, S104 and S105.Preferably, also can comprise above-mentioned controlled step 1)-3).
Fig. 4 is the block diagram based on the multi-carrier-wave wireless receiver 2 of many band filters that is used to receive the signal launched by transmitting set shown in Figure 1 in mobile communications network of the embodiment according to the present invention.
Wherein, wireless receiver 2 comprises that a matched filter banks device 20, one or more channel estimating apparatus are (among Fig. 4 for simplicity's sake, two channel estimating apparatus 21 and 23 only are shown, correspond respectively to one tunnel output of matched filter banks device), one or more balancer is (among Fig. 4 for for simplicity's sake, two balancers 22 and 24 only are shown, correspond respectively to one tunnel output of matched filter banks device), the parallel/serial converting means of linear inversion device 25,26, a symbol demodulation device 27 and a channel code translator 28.
Wherein, for simplicity's sake, do not have the part of direct relation in the wireless receiver 2 with the present invention, digital demodulating apparatus, channel code translator, channel estimating apparatus and balancer only are shown.And be used to receive the reception antenna of wireless signal, be used for wireless signal is down-converted to the radio frequency converter plant of base band and is used for the synchronous synchronizer of received signal not shown in the drawings.
Suppose the receiver ideal synchronisation, through reception antenna and RF radio-frequency module, wireless receiver 1 can obtain a baseband signal { y
k, k=0,1,2, L};
Matched filter banks device 20 is finished the inverse operation with transmitting terminal signal shaping bank of filters device coupling, is used for from described baseband signal { y
k, k=0,1,2, isolate each road modulation symbol sequence among the L}.Because the processing procedure of each road modulation symbol sequence is identical, to simplify the analysis, channel estimating apparatus 21 below and balancer 22 are only at the road modulation symbol sequence { l that exports
k, k=0,1,2, the processing procedure of L} is described, and the processing procedure of the modulation symbol sequence of other each roads output is identical with it and be parallel processing;
Channel estimating apparatus 21 is used for estimating at time domain antithetical phrase channel response, to obtain the estimated value { w of subchannel response
k, k=0,1,2, L L-1}, here, L is the maximum delay of time domain subchannel response;
Channel estimation value { the w that provided based on channel estimating apparatus 21 is provided balancer 22
k, k=0,1,2, L L-1} is to one road output symbol sequence { l of matched filter banks
k, k=0,1,2, L} carries out equalization operation.Balanced dateout sequence is { p
k, k=0,1,2, L}.
Linear inversion device 25 is used for each road through balanced symbol data sequence { p
k, k=0,1,2, L} carries out and the corresponding inverse operation of transmitting terminal linear transformation (linear inversion), with the parallel symbol sequence of blocks of data { q of output through linear transformation
k, k=0,1,2, L}, here, q
kExpression number of elements and the identical column vector of linear transformation size;
And string conversion equipment 26 is used for the parallel symbol sequence of blocks of data { q after the linear inversion
k, k=0,1,2, L} carries out parallel serial conversion, to generate the symbol data sequence { t of a serial
k, k=0,1,2, L};
Digital demodulating apparatus 27 is used for according to the symbol data sequence { t of the corresponding decoding rule of the Gray coding rule of transmitter terminal to described serial
k, k=0,1,2, L} carries out demodulation, to generate corresponding digital sequence { u
k, k=0,1,2, L}.If the channel decoding algorithm of be about to carrying out will be based on the hard decision input information, then Shu Chu hard information Serial No. be 0} and the random alignment of 1}, otherwise, will output accordingly based on the soft message digit sequence of counting bit quantization;
Channel code translator 28 is used for coming described Serial No. { u according to the corresponding decoding rule of chnnel coding rule with transmitter terminal
k, k=0,1,2, L} carries out channel decoding, to generate the Serial No. { v through channel decoding
k, k=0,1,2, L}.
Though with reference to Fig. 4 the multi-carrier radio transmitter 2 based on bank of filters in mobile communications network is described above, this only is clear for what describe.Should be appreciated that; the present invention is claimed to be to be used to reception according to the device that carries out the transmission signals of peak-to-average force ratio reduction operation at transmitter terminal of the present invention in the multi-carrier receiver based on many band filters group a kind of; wherein, described multicarrier transmitter and receiver can comprise wireless or wired device that transmits and receives.Describedly be used to be received in transmitter terminal and carry out device that peak-to-average force ratio reduces the transmission signals of operation and mainly comprise above-mentioned matched filter banks device 20, linear inversion device 25 and and go here and there conversion equipment 26.
Fig. 5 for the embodiment according to the present invention mobile communications network based on the multi-carrier-wave wireless receiver of many band filters group in receive according to of the present invention and carry out the flow chart that peak-to-average force ratio reduces the method for the transmission signals of handling at transmitter terminal.
Wherein, for simplicity's sake, do not have the part of direct relation in the described method of reseptance with the present invention, symbol demodulation step, channel decoding step, channel estimation steps and equalization step only are shown.And be used for receiving the step of wireless signal by antenna, be used for wireless signal is down-converted to the step of base band and is used for the synchronous synchronizing step of received signal not shown in the drawings.
Suppose described receiver 2 ideal synchronisation, through reception antenna and RF radio-frequency module, wireless receiver 2 can obtain a baseband signal { y
k, k=0,1,2, L};
In step S201, to described baseband signal { y
k, k=0,1,2, L} carries out the inverse operation that is complementary with transmitting terminal subchannel filtering mapping, is used for from described baseband signal { y
k, k=0,1,2, isolate each road modulation symbol sequence among the L}.Because the processing procedure of each road modulation symbol sequence is identical, to simplify the analysis, among step S202 below and the S203 only at one road modulation symbol sequence { l wherein
k, k=0,1,2, the processing procedure of L} is described, and the processing procedure of the modulation symbol sequence that export on other each roads is identical with it and be parallel processing, enters step S202 subsequently;
In step S202, estimate at time domain antithetical phrase channel response, thereby obtain the estimated value { w that subchannel responds
k, k=0,1,2, L L-1}, here, L is the maximum delay of time domain subchannel response;
In step S203, the estimated value { w of the channel response that is provided based on above-mentioned steps S202
k, k=0,1,2, L L-1} is to above-mentioned this road modulation symbol sequence { l via step S201 output
k, k=0,1,2, L} carries out equalization operation, with the symbol data sequence { p of output through equilibrium
k, k=0,1,2, L} enters step S204 subsequently;
In step S204, to the symbol data sequence { p of each road through equilibrium
k, k=0,1,2, L} carries out and the corresponding inverse operation of transmitting terminal linear transformation (linear inversion), with the parallel symbol sequence of blocks of data { q of output through linear inversion
k, k=0,1,2, L}, here, q
kExpression number of elements and the identical column vector of linear inversion size enter step S205 subsequently;
In step S205, will be through the parallel symbol sequence of blocks of data { q after the linear inversion
k, k=0,1,2, L} carries out and goes here and there conversion, to generate the symbol data sequence { t of a serial
k, k=0,1,2, L} enters step S206 subsequently;
In step S206, according to the symbol data sequence { t of the corresponding decoding rule of the Gray coding rule of transmitter terminal to described serial
k, k=0,1,2, L} carries out demodulation, to generate corresponding digital sequence { u
k, k=0,1,2, L}.If the channel decoding algorithm of be about to carrying out will be based on the hard decision input information, then Shu Chu hard information Serial No. be 0} and the random alignment of 1}, otherwise, output accordingly based on the soft message digit sequence of counting bit quantization, is entered step S207 subsequently;
In step S207, come described Serial No. { u according to the corresponding decoding rule of chnnel coding rule with transmitter terminal
k, k=0,1,2, L} carries out channel decoding, to generate the Serial No. { v through channel decoding
k, k=0,1,2, L}.
Though above with reference to Fig. 5 described mobile communications network based on the multi-carrier-wave wireless receiver of many band filters group in receive according to of the present invention and carry out the method that peak-to-average force ratio reduces the transmission signals of handling at transmitter terminal, this only is clear for what describe.Should be appreciated that; the present invention is claimed be a kind of in multi-carrier receiver, be used to receive according to of the present invention based on many band filters group carry out the method that peak-to-average force ratio reduces the transmission signals of operation at transmitter terminal; wherein, described multicarrier transmitter and receiver can comprise wireless or wired device that transmits and receives.Describedly be used to be received in transmitter terminal and carry out the device that peak-to-average force ratio reduces the transmission signals of operation and mainly comprise above-mentioned steps S201, S204 and S205.
Fig. 6 and 7 shows the chart that adopts the multicarrier system peak-to-average force ratio CCDF (CCDF) based on many band filters group of the present invention.As seen from Figure 4, when adopting the QPSK modulation,, there is the peak-to-average force ratio of 1% transmission symbol to surpass 8.3dB for the multicarrier system of direct mapping; And under the equal probabilities condition, adopting the peak-to-average force ratio of unequal interval of the present invention mapping is 5dB, and adopts that peak-to-average force ratio has only 2.5dB when uniformly-spaced shining upon, and peak-to-average force ratio with single-carrier system (adopting the transmission system of a subfilter) is identical basically for this.As seen from Figure 5, when adopting the 16QAM modulation, under above-mentioned equal probabilities condition, adopt the multicarrier system low about 3dB of the peak-to-average force ratio of unequal interval mapping of the present invention than directly mapping, and adopt the peak-to-average force ratio low about 1.5dB of the peak-to-average force ratio of uniformly-spaced mapping, and only than the high about 1dB of single-carrier system than unequal interval.
The initialization system simulation parameter:
Bank of filters base filter: root rises the surplus filter that revolves
The total number of bank of filters subband: 16
FFT size (the subband number of use): 8
Modulation system: QPSK/16QAM
More than specific embodiments of the invention are described.Need to understand being, the present invention is not limited to above-mentioned specific for execution mode, and those skilled in the art can make various distortion or modification within the scope of the appended claims.
Claims (22)
1. method that is used to reduce peak-to-average force ratio in the multi carrier transmitting apparatus based on many band filters group, it comprises the steps:
With the input string character data sequence string and be converted to the parallel symbol sequence of blocks of data;
Described parallel symbol sequence of blocks of data is carried out linear transformation by genesis sequence, generate symbol data piece sequence through linear transformation;
Be mapped on the corresponding subchannel through the symbol of element in each symbol data piece of linear transformation described respectively, its sub-channels is arranged by its pairing frequency order.
2. method according to claim 1 is characterized in that,
Described linear transformation is orthogonal linear transformation.
3. method according to claim 2 is characterized in that,
Described orthogonal linear transformation is discrete Fourier transform (DFT) or contrary discrete Fourier transform (DFT).
4. according to each described method among the claim 1-3, it is characterized in that,
The described step that respectively symbol of element in described process each symbol data piece of linear transformation is mapped to corresponding subchannel is: the sequential scheduling compartment of terrain by subchannel is mapped to the described symbol of element on the corresponding subchannel.
5. according to each described method among the claim 1-4, it is characterized in that, also comprise the steps:
Adjust the bandwidth of described subchannel according to the channel coherence bandwidth,
Adjust the number of described subchannel according to channel width.
6. method according to claim 5 is characterized in that, also comprises the steps:
Adjust the size of described linear transformation according to signal transmission rate.
7. according to claim 5 or 6 described methods, it is characterized in that, also comprise the steps:
Adjust described through the symbol of element in the symbol data piece of linear transformation and the mapping mode between the described subchannel according to channel quality.
8. device that in multicarrier transmitter, is used to reduce peak-to-average force ratio based on many band filters group, it comprises:
Go here and there and conversion equipment for one, be used for the string character data sequence string that to import and change the parallel symbol sequence of blocks of data;
A linear transformation device is used for described parallel data block sequence is carried out linear transformation by genesis sequence, generates the symbol data piece sequence through linear transformation;
The forming filter of band more than group device, it comprises a plurality of subfilters, the respectively corresponding subchannel of described each subfilter, its sub-channels is arranged by its pairing frequency order,
Wherein, described each subfilter is respectively applied for the respective element sign map in the described process symbol data piece of linear transformation to corresponding subchannel.
9. device according to claim 8 is characterized in that,
Described linear transformation is orthogonal linear transformation.
10. emitter according to claim 9 is characterized in that,
Described orthogonal linear transformation is discrete Fourier transform (DFT) or contrary discrete Fourier transform (DFT).
11. each described device is characterized in that according to Claim 8-10,
Described forming filter group device also is used for by the sequential scheduling compartment of terrain of subchannel the described symbol of element being mapped to corresponding subchannel.
12. each described device is characterized in that according to Claim 8-11, also comprises
A control device is used for adjusting according to the channel coherence bandwidth bandwidth of described subchannel; With the number of adjusting described subchannel according to channel width.
13. device according to claim 12 is characterized in that,
Described control device also is used for adjusting according to signal transmission rate the transform size of described linear transformation device.
14. according to claim 12 or 13 described devices, it is characterized in that,
Described control device also is used for adjusting the symbol of element of described symbol data piece through linear transformation and the mapping mode between the described subchannel according to channel quality.
15. a method that is used to receive the signal that peak-to-average force ratio reduces in the multicarrier receiver based on many band filters group, it comprises the steps:
To the subchannel filtering map operation corresponding inverse operation of incoming symbol signal execution, to isolate the multipath symbols data sequence with transmitter terminal;
To the linear transformation corresponding linear inverse transformation of described multipath symbols data sequence execution, to generate symbol data piece sequence through linear inversion with transmitter terminal;
Described symbol data piece sequence through linear inversion undertaken by genesis sequence and go here and there conversion, with generation string character data sequence.
16. method according to claim 15 is characterized in that, and is further comprising the steps of:
In time domain the response of each subchannel is estimated, to obtain the estimated value of subchannel response.
Channel response estimated value based on described each subchannel is carried out equalization operation to corresponding one road symbol data sequence, passes through balanced symbol data sequence to generate one the tunnel, and is provided for described linear inversion step.
17. according to claim 15 or 16 described methods, it is characterized in that,
Described linear transformation is orthogonal linear transformation.
18. method according to claim 17 is characterized in that,
Described orthogonal linear transformation is discrete Fourier transform (DFT) or contrary discrete Fourier transform (DFT).
19. the multicarrier receiver based on many band filters group that is used to receive the signal that peak-to-average force ratio reduces, it comprises:
A matched filter banks device is used for to the subchannel filtering map operation corresponding inverse operation of incoming symbol signal execution with transmitter terminal, to isolate the multipath symbols data sequence;
A linear inversion device is used for to the linear transformation corresponding linear inverse transformation of described multipath symbols data sequence execution with transmitter terminal, to generate the symbol data piece sequence through linear inversion;
One and go here and there conversion equipment, be used for described symbol data piece sequence through linear inversion being undertaken by genesis sequence and go here and there conversion, with generation string character data sequence.
20. device according to claim 17 is characterized in that,
Channel estimating apparatus is used in time domain the response of each subchannel being estimated, to obtain the estimated value of subchannel response;
Balancer is used for based on the channel response estimated value of described each subchannel corresponding one road symbol data sequence being carried out equalization operation, passes through balanced symbol data sequence to generate one the tunnel, and is provided for described linear inversion device.
21. according to claim 19 or 20 described devices, it is characterized in that,
Described linear transformation is orthogonal linear transformation.
22. device according to claim 21 is characterized in that,
Described orthogonal linear transformation is discrete Fourier transform (DFT) or contrary discrete Fourier transform (DFT).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867547A (en) * | 2010-05-24 | 2010-10-20 | 北京科技大学 | Method for reducing peak-to-average power ratio of filter bank multi-carrier system |
| CN102904854A (en) * | 2011-07-29 | 2013-01-30 | 上海贝尔股份有限公司 | Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system |
| CN103326987A (en) * | 2013-07-15 | 2013-09-25 | 西安电子科技大学 | Peak-to-average power ratio suppression method based on cyclic constellation shift |
-
2005
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867547A (en) * | 2010-05-24 | 2010-10-20 | 北京科技大学 | Method for reducing peak-to-average power ratio of filter bank multi-carrier system |
| CN101867547B (en) * | 2010-05-24 | 2013-04-24 | 北京科技大学 | Method for reducing peak-to-average power ratio of filter bank multi-carrier system |
| CN102904854A (en) * | 2011-07-29 | 2013-01-30 | 上海贝尔股份有限公司 | Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system |
| CN103326987A (en) * | 2013-07-15 | 2013-09-25 | 西安电子科技大学 | Peak-to-average power ratio suppression method based on cyclic constellation shift |
| CN103326987B (en) * | 2013-07-15 | 2016-04-06 | 西安电子科技大学 | Based on the method for inhibiting peak-to-average ratio of circulation constellation displacement |
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