CN101030845A - Transmitter, receiver and its method for FDMA - Google Patents
Transmitter, receiver and its method for FDMA Download PDFInfo
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Abstract
The invention is based on biorthogonal multi-subband filterbanks. The transmitting device converts the sending sequence symbols to be transmitted into multi serial sequence symbols by using series/parallel conversion; the biorthogonal multi-subband filterbanks modulates each serial sequence symbol to the subcarrier corresponding to different subband; partitioning the multicarrier signals outputted from the biorthogonal multi-subband filterbanks; adding the 'cycle prefix' into each data block that is transmitted to the RF; the receiving device receives the signal block and removes 'cycle prefix', and then makes frequency-domain equalization for each data block; the biorthogonal multi-subband filterbanks restores the transmitting signal from the data block.
Description
Technical field
The present invention relates to a kind of emission, receiving system and method thereof of fdma system, belong to the wide-band mobile communication technical field.
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.
The OFDM modulation is divided into many mutually orthogonal subchannels with whole broad-band channel, and each subchannel is distributed to each user with exclusive mode, forms OFDMA.Owing to connect in the road in the descending of wireless communication system, for each user, the orthogonality ratio between each subchannel is easier to obtain, and therefore adopts OFDMA, and the multiple access that can solve preferably between the multi-user disturbs (MAI).Yet in the up link of wireless communication system, if adopt OFDMA, receiving terminal (such as the base station) must be to the multiple user signals joint demodulation that inserts simultaneously.Because transmitting of each user be relatively independent, thus OFDMA cannot say for sure to demonstrate,prove between the necessary subscriber signal of joint demodulation synchronously.When having bigger carrier wave and timing slip between each subscriber signal, certainly will cause interference among multiple users.Many band filters group can be divided into whole broad-band channel many quasiorthogonal subchannels mutually, and each subchannel is relatively independent, and has certain frequency domain protection between the subchannel at interval.The FDMA system that employing constitutes based on the multi-carrier filter group, receiving terminal (such as the base station) can be distinguished independent demodulation to the multiple user signals that inserts simultaneously, and is therefore very strong to the carrier wave and the timing slip robustness of each subscriber signal.
In the frequency division multiple access technology based on many Methods of Subband Filter Banks of prior art, add CP (Cyclic Prefix) usually after each subband carries out filtering, the signal in each subband carries out the subband molding filtration usually after adding CP (Cyclic Prefix).Because signal is a narrow band signal in the subband, the time domain of formed filter roll-off rising edge and trailing edge will near in addition surpass the length of CP.Therefore reduce the effective length of CP greatly.Like this, under given channel delay expansion condition, need longer CP (Cyclic Prefix).
Existing frequency division multiple access technology based on many Methods of Subband Filter Banks is that to utilize the information that obtains after the subband demodulation to finish received signal synchronous.Because subband internal symbol speed is lower, be that sample frequency is lower, and the sample rate of received signal (that is input data symbol of many subbands demodulation) is higher (usually greater than subband internal symbol sample frequency N doubly, N is a sub-band sum), therefore utilize the low sampling rate information that obtains after the subband demodulation finish the demodulation of many subbands high sampling rate input data symbol synchronously, its implementation complexity and synchronization accuracy all be cannot say for sure card.
In the existing frequency division multiple access technology based on the orthogonal multi-subband bank of filters, many subbands formed filter group of transmitting terminal and many subbands matched filter banks of receiving terminal are symmetrical structure, be that the corresponding prototype filter of prototype filter and the many subbands formed filter group of transmitting terminal of many subbands matched filter banks correspondence of receiving terminal is identical, as all being root raised cosine filter, and the filter coefficient number is identical.In fdma system, for avoiding interference among multiple users, should try one's best suddenly in the frequency spectrum edge of each subband, and this just needs the coefficient of prototype filter more, thereby cause many Methods of Subband Filter Banks implementation complexity to increase.In the up link of wireless communication transmissions, the implementation complexity of travelling carriage transmitter and power consumption are vital factors.At this moment, adopt traditional frequency division multiple access The Application of Technology to be very restricted based on the orthogonal multi-subband bank of filters.
Summary of the invention
The objective of the invention is to, a kind of emission, receiving system and method thereof of fdma system is provided, with the complexity of the existing multicarrier one fdma system transmitter of effective reduction; When emission, the receiving system of this fdma system are used for the mobile communication up link, can effectively reduce the implementation complexity and the power consumption of portable terminal.
For reaching above-mentioned purpose, the present invention adopts and sends out technical scheme following:
A kind of emitter of fdma system, comprise many sub-filters, being used for that every way band parallel symbol sequence of blocks of data is carried out the subband multiphase filtering respectively handles, and described a plurality of parallel symbol sequence of blocks of data through subband multiphase filterings synthesize processing, with generation serial output symbol data sequence; It is characterized in that: the filter in described many sub-filters is the heterogeneous formed filter of biorthogonal, be used for the sequence through up-sampling is carried out the sub-band filter forming operation, the coefficient of wherein said multiphase filtering apparatus is obtained by the displacement sampling by same biorthogonal moulding prototype filter coefficient.
A kind of receiving system of fdma system, comprise many subbands matched filter, be used for described each data block of serial incoming symbol sequence of blocks of data and carry out the waveform operation splitting, to generate the short symbol data piece of a plurality of length, and described a plurality of short symbol data pieces are carried out respectively and the corresponding subband matched filtering operation of the sub-band filter of emitter end, to generate a plurality of symbol sebolic addressings through subband matched filtering operation, it is characterized in that: the filter of described many subbands matched filter is the heterogeneous matched filter device of a biorthogonal, be used for carry out subband matched filtering operation through the sequence of serial/parallel conversion, the heterogeneous matched filter coefficient of described biorthogonal obtains by same biorthogonal coupling prototype filter displacement sampling.
A kind of launching technique of fdma system, comprise many sub-band filters step, every way band parallel symbol sequence of blocks of data is carried out the subband multiphase filtering respectively to be handled, and described a plurality of parallel symbol sequence of blocks of data through subband multiphase filterings synthesize processing, with generation serial output symbol data sequence; It is characterized in that: be filtered into the heterogeneous molding filtration of biorthogonal in described many sub-band filters step, sequence through up-sampling is carried out the sub-band filter forming operation, and the coefficient of wherein said multiphase filtering is obtained by the displacement sampling by same biorthogonal moulding prototype filter factor.
A kind of method of reseptance of fdma system, comprise many subbands matched filtering step, each data block is carried out the waveform operation splitting in the described serial incoming symbol sequence of blocks of data, to generate the short symbol data piece of a plurality of length, and described a plurality of short symbol data pieces are carried out respectively and the corresponding subband matched filtering operation of the sub-band filter of emitter end, to generate a plurality of symbol sebolic addressings through subband matched filtering operation, it is characterized in that: described many subbands matched filtering step be filtered into the heterogeneous matched filtering of a biorthogonal, to carry out subband matched filtering operation through the sequence of serial/parallel conversion, the heterogeneous matched filtering coefficient of described biorthogonal obtains by same biorthogonal coupling prototype filtering displacement sampling.
The present invention both can be applicable to multicarrier, also can be applicable to single carrier.With traditional comparing with the solution of OFDMA multicarrier-fdma system based on OFDM, based on the multicarrier-fdma system of many Methods of Subband Filter Banks to the time/robustness of frequency synchronous error improves a lot.
In the present invention, many subbands matched filter banks of many subbands of transmitting terminal formed filter group and receiving terminal is the bi-orthogonal filter group, is unsymmetric structure.The prototype filter of many subbands formed filter group correspondence of transmitting terminal can be for satisfying the linear phase FIR filter of subband spectrum characteristic arbitrarily, and satisfy the biorthogonal condition between the prototype filter of many subbands of the receiving terminal matched filter correspondence prototype filter corresponding with many subbands formed filter group of transmitting terminal.And the number of coefficients of the prototype filter of many subbands of transmitting terminal formed filter group correspondence can be less than the prototype filter number of coefficients of many subbands matched filter correspondence of receiving terminal.Therefore, adopt the frequency division multiple access technology of the many Methods of Subband Filter Banks of biorthogonal to be applied in the up link of wireless communication transmissions, can reduce the implementation complexity and the power consumption of travelling carriage transmitter.
Description of drawings
Fig. 1 is the block diagram of the transmitter of embodiment of the invention fdma system.
Fig. 2 is that waveform cutting device shown in Figure 1 carries out buffer memory and the schematic diagram that blocks the branch block operations.
Fig. 3 is the block diagram of the receiver of embodiment of the invention fdma system.
Fig. 4 is a data block cyclic extensions schematic diagram of the present invention.
Embodiment
Fig. 1 illustrate a kind of according to the present invention the block diagram of the transmitter of the fdma system of realizing based on many Methods of Subband Filter Banks of an embodiment.Comprising one that is connected successively serial/parallel conversion equipment 12, subband mapping device 13, IFFT converting means 14 that M is ordered, a M up-sampling device (for simplicity's sake, only illustrate three 150 among Fig. 1,151 and 152), M multiphase filtering apparatus (for simplicity's sake, only illustrate three 160 among Fig. 1,161 and 162), parallel/serial conversion equipment 17,18, one data blocks of a waveform synthesizer form device 19 and a Cyclic Prefix adding set 20.Need to prove, as the channel coding device of digital communication system transmitter necessary component, digital modulation device, a RF converter plant and a transmitting antenna and purpose of the present invention there is no direct relation, are not described at this.If be single-carrier system, then between serial/parallel conversion equipment 12 and subband mapping device 13, also be provided with a DFT converting means, be used for each parallel symbol sequence of blocks of data is carried out the FFT conversion, promptly realize spread spectrum operation, to generate the parallel symbol sequence of blocks of data based on the DFT conversion.
Suppose { a
k, k=0,1,2....} is the serial modulated symbols sequence that is input to the string and the conversion equipment 12 of transmitter;
String and conversion equipment 12 are used for symbol modulated string character data sequence { a
k, k=0,1,2....} goes here and there and conversion operations, to form corresponding a plurality of parallel symbol data block { b
k, k=0,1,2....}, here, b
kRepresent a column vector, the size of this vector equals the number of sub-bands K that the user is assigned with;
IFFT converting means 14 is used for each the parallel symbol sequence of blocks of data { d to input
k, k=0,1,2....} carries out M point IFFT conversion.The IFFT conversion M that counts equals sub-band sum.Through the IFFT conversion module, the sequence of blocks of data { d that input is parallel
k, k=0,1,2....} is transformed into corresponding data block sequence { g
k, k=0,1,2....}, relation is each other obeyed g
k=IFFT (e
k), here, g
kAlso represent a number of elements and the same column vector of IFFT transform size M.
Up-sampling device 150,151,152 is respectively applied for the data block g through the IFFT conversion
kIn each element carry out the operation of R times of up-sampling, promptly add R-1 zero in each element back.Wherein, R=L/M, L are multiphase filter 160,161, the length of the prototype filter of 162 correspondences, and M is a sub-band sum.Through up-sampling, k the sequence of blocks of data output sequence constantly of m up-sampling device is { h
k m(n), n=0,1,2..., R-1; M=0,1 ..., M-1; K=0,1,2 ....
The heterogeneous formed filter 160,161 of biorthogonal and 162 is respectively applied for the sequence { h through up-sampling
k m(n) } carry out the sub-band filter forming operation.Wherein the coefficient of each biorthogonal multiphase filter is got by the displacement sampling by same biorthogonal moulding prototype filter coefficient.Particularly, suppose that biorthogonal moulding prototype filter coefficient (that is impulse response) is { f
p(n), n=0,1,2..., L-1}, wherein L is a filter length, its frequency response is the list low-pass filter.This filter can be for satisfying the linear phase FIR filter of subband spectrum characteristic arbitrarily, and its sample frequency is all subband bandwidth sums.Then m (m=0,1 ..., M-1) individual heterogeneous formed filter coefficient be above-mentioned biorthogonal moulding prototype filter coefficient initial value displacement m point afterwards M times of down-sampling get i.e. { f
0m(n)=f
p(nM+m), n=0,1,2..., L/M-1}, (wherein M is a sub-band sum, and L is the integral multiple of M.After the two F of process handed over heterogeneous molding filtration apparatus, k the sequence of blocks of data output sequence constantly of m multiphase filter was { i
k m(n), n=0,1,2..., L/M-1; K=0,1,2 ....
Parallel/serial conversion equipment 17 is used for the data from M multiphase filter group of parallel input being carried out and going here and there conversion.Process and string conversion equipment, the serial data block sequence of output is { l
k(n), n=0,1,2..., L; K=0,1,2 ..., { l here
k(n) } be expressed as the serial data block that block length is L.
Data block forms device 19, is used for the data sequence after synthetic through waveform is carried out buffer memory, and operation that data block intercepts and circulation adds up, it is operated as shown in Figure 2.Wherein data cached length is the sequence length E of the data block of F subband mapping output through waveform synthetic back output.In fact, E=(F-1) * N+L, wherein L is a biorthogonal moulding prototype filter length, N is the shift-orthogonal interval of receiving terminal biorthogonal coupling prototype filter and transmitting terminal biorthogonal moulding prototype filter.Be that the data sequence of E is divided into length and is respectively F1 then with the length of buffer memory, the three segment data pieces of Q and F2 make E=F1+Q+F2.Preferably, Q=F * N.Select F and N, make Q 〉=F1+F2, and F1 and F2 should equate as far as possible.The three segment data pieces that will be divided into the at last stack that circulates from beginning to end, the last F1 point data stack of the Q point data piece of the preceding F1 point data of intercepting and intercepting soon, simultaneously, with the preceding F2 point data stack of the Q point data piece of back F2 point data and the intercepting of intercepting, formation length is the cycling wave form sequence { l of Q
k, k=0,1 ..., Q-1}.Because Q is the prototype filter shift-orthogonal integral multiple of N at interval, sequence { l
k, k=0,1 ..., Q-1} is the continuous cyclic sequences of head and the tail;
Cyclic Prefix adding set 20, the protection that is used for adding a length-specific in the head or tail portion through the data block after string and the conversion are used to reduce interchannel interference (length at this protection interval should greater than channel maximum delay extension length) at interval.Preferably, protection adding set at interval can be adopted Cyclic Prefix (CP) adding set, and a part that is about to described data block afterbody copies to its front end, forms the data block symbols of final band CP.Through Cyclic Prefix adding set, input block sequence { l
k, k=0,1,2....} is transformed into complete data block symbols sequence { m
k, k=0,1,2....}, here, m
kRepresent that a number of elements is the row vector of P, and P=Q+C, C is a circulating prefix-length.
Fig. 3 illustrate a kind of according to the present invention the block diagram of the receiver of the fdma system of realizing based on many Methods of Subband Filter Banks of an embodiment.Comprising a Cyclic Prefix removal device 30,32, one serial/parallel conversion equipments 33 of 31, one waveform decomposers of a data block expanding unit, M heterogeneous matched filter (for simplicity's sake, only illustrate three 340,341 and 342 among Fig. 1), M downsampling device is (for simplicity's sake, only illustrate three 350 among Fig. 1,351 and 352), 36, one subband solutions mapping devices 37 of FFT converting means and parallel/serial conversion equipment 38 that M is ordered.When being single carrier-frequency division multiple access system, also need an IFFT converting means between subband solutions mapping device 37 and the parallel/serial conversion equipment 38, owing to de-spreading operation based on DFT.Need to prove, as the synchronizer of digital communication system receiver necessary component, channel estimating apparatus, balancer, channel decoding device and digital demodulating apparatus and purpose of the present invention there is no direct relation, are not described at this.
Suppose { n
k, k=0,1,2....} is the string character sequence that is input to the Cyclic Prefix removal device 30 of emitter/receiver; And supposition receiver ideal synchronisation.
Cyclic Prefix removal device 30 is used for according to the structure that transmits the symbol sebolic addressing of importing being divided into the serial data block sequence that length is P, and preceding C sampled value in each data block cast out, and forming length is the serial data block sequence { o of Q
k, k=0,1,2....}.Here, o
kRepresent that a number of elements is the row vector of Q;
Data block expanding unit 31, be used at first finishing the transmitting terminal data block and form device 19 corresponding inverse operations, promptly the length to input is the data block head and the tail two ends cyclic extensions of Q, and each adds that (L '-L)/2 zero, constituting length is the data block of E ' at expanded data piece two ends then.Its operation is as Fig. 4.The length of hypothesis input herein is that the data block of Q has been passed through channel equalization.The data block cyclic extensions is exactly stem F2 sampled value of Q point data piece to be added to the afterbody of Q point data piece, with F1 the stem that sampled value is added Q point data piece to of Q point data piece afterbody, forming a length is the symbol data piece of E (E=F1+Q+F2=(F-1) N+L) again.Then, length be E the data block two ends each add that (L '-L)/2 zero, constituting length is the data block of E '.In fact, E '=(F-1) * N+L ', wherein L ' is a biorthogonal coupling prototype filter length, and N is that data block forms data in buffer piece number in the device 19 for the shift-orthogonal interval of receiving terminal biorthogonal coupling prototype filter and transmitting terminal biorthogonal moulding prototype filter, F.Two ends form string character sequence of blocks of data { p through the data block expanding unit
k, k=0,1,2....}.Here, p
kRepresent that a number of elements is the row vector of E ';
Serial/parallel conversion equipment 33 is used for the sequence of blocks of data { q with the serial input
k, k=0,1,2....} is converted to parallel data block sequence { r
k, k=0,1,2....}.Here, r
kRepresent the column vector that number of elements is M;
The heterogeneous matched filter 340,341 of biorthogonal and 342 is respectively applied for the sequence { r through serial/parallel conversion
k, k=0,1,2....} carries out subband matched filtering operation.Wherein the heterogeneous matched filter coefficient of each biorthogonal is that same biorthogonal coupling prototype filter displacement sampling gets.The prototype filter coefficient (that is impulse response) of supposing the heterogeneous matched filter correspondence of biorthogonal is { f
p %(n), n=0,1,2..., L '-1}, wherein L ' is a filter length, and L ' can be not equal to transmitting terminal biorthogonal moulding prototype filter length L.When the present invention is used for the mobile communication up link, preferably, L '＞L.Satisfy the biorthogonal condition between this biorthogonal coupling prototype filter and the transmitting terminal biorthogonal moulding prototype filter:
N is the shift-orthogonal interval, is constant.Then m (m=0,1 ..., M-1) the heterogeneous matched filter coefficient of individual biorthogonal be biorthogonal coupling prototype prototype filter coefficient initial value displacement m point afterwards M times of down-sampling get, promptly
(wherein M is a sub-band sum, and L ' is the integral multiple of M.Through the heterogeneous matched filtering of biorthogonal, the output sequence of m multiphase filter is { t
m(n), n=0,1,2 ... L '/M-1; M=0 ..., M-1}.
Downsampling device 350,351 and 352 is used for carry out R times of down-sampling operation through the data sequence of heterogeneous matched filtering.Particularly, downsampling device is pressed the sequence of blocks of data { d of transmitting terminal subband mapping output
k, k=0,1, the time interval of 2....}, take out L '/M-1 value in each heterogeneous matched filtering dateout sequence, and with the shift register zero setting in the heterogeneous matched filter.Through downsampling device, the output sequence of m downsampling device is { u
k m, m=0 ..., M-1; K=0,1,2 ....
FFT converting means 36 is used for the symbol sebolic addressing { u to each downsampling device output of input
k m, m=0 ..., M-1; K=0,1,2 ... carry out M point FFT conversion.Through the FFT conversion, the parallel data sequence of input is transformed into corresponding data block sequence { v
k, k=0,1,2....}, relation is each other obeyed v
k=FFT (u
k), here,
v
kRepresent a number of elements and the same column vector of FFT transform size M.
Subband solutions mapping device 37 is used to finish the opposite inverse operation of transmitting terminal subband mapping device 12.Promptly according to the mode of transmitting terminal subband mapping, from data block v through phase shift
kThe corresponding K point data of middle taking-up.Through the subband solutions mapping device, be output as sequence of blocks of data { x
k, k=0,1,2....}, here, x
kRepresent that also a number of elements is the column vector of K.
Parallel/serial conversion equipment 38 is used for the sequence of blocks of data { x to input
k, k=0,1,2....} carries out parallel/serial conversion operations.Through parallel/serial conversion equipment, be output as serial data symbol sebolic addressing { y
k, k=0,1,2....} is used for the symbol demodulation and the decoding of receiving terminal, to recover the information bit of emission.
A kind of launching technique of fdma system may further comprise the steps successively:
Wherein said step of transmitting also comprises to be located at before the phase shift step:
Serial/parallel switch process is gone here and there symbol modulated string character data sequence and conversion operations, to form corresponding a plurality of parallel symbol data block; If be single carrier, then after this step, also be provided with the FFT shift step, each parallel symbol sequence of blocks of data is carried out the FFT conversion, promptly realize spread spectrum operation, to generate the parallel symbol sequence of blocks of data based on the DFT conversion;
The subband mapping step will be mapped to respectively on the corresponding subband through each element in string and the data converted piece and transmit, for the subband transmission 0 that does not have data map.
Many sub-band filters step is carried out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data and is handled, and described a plurality of parallel symbol sequence of blocks of data through the subband multiphase filtering are synthesized processing, to generate serial output symbol data sequence; Be filtered into the heterogeneous molding filtration of biorthogonal in described many sub-band filters step, the sequence through up-sampling is carried out the sub-band filter forming operation, the coefficient of wherein said multiphase filtering is obtained by the displacement sampling by same biorthogonal moulding prototype filter factor.The linear phase FIR filter that satisfies the subband spectrum characteristic is arbitrarily adopted in described biorthogonal prototype filtering.Described biorthogonal prototype filter factor is { f
p(n), n=0,1,2..., L-1}, wherein L is a filter length, the frequency response of this biorthogonal prototype filtering is a list band low pass frequency response.Described heterogeneous molding filtration coefficient is that the M times of down-sampling in described biorthogonal moulding prototype filter factor initial value displacement m point back gets, and wherein L is the integral multiple of M.
Data block forms step, the serial output symbol data sequence of the synthetic output of described waveform is carried out buffer memory, data block intercepting and the circulation operation that adds up, to generate the serial output symbol sequence of blocks of data that circulates through head and the tail.
Described protection is added step at interval: the part of described string character data block afterbody is copied to its front end, to generate the string character sequence of blocks of data of band Cyclic Prefix.In this specific embodiment be: with described each be divided into the head of string character data block of predetermined length or protection that afterbody adds a length-specific at interval, have protection string character sequence of blocks of data at interval with generation.
Wherein, described many sub-band filters steps in sequence may further comprise the steps:
The IFFT shift step is carried out M point IFFT conversion to each parallel symbol sequence of blocks of data, and element number is the parallel symbol sequence of blocks of data of M in the data block to generate;
M up-sampling step carried out R times of up-sampling operation to M element in each data block in the described parallel symbol sequence of blocks of data respectively, to generate M string character sequence through up-sampling;
M the heterogeneous molding filtration step of biorthogonal is used for the sequence through up-sampling is carried out the sub-band filter forming operation;
Parallel/serial switch process carries out the data from M the heterogeneous formed filter of biorthogonal of parallel input and goes here and there conversion, with generation serial output symbol sequence;
The waveform synthesis step, above-mentioned serial output symbol sequence is by the shift-orthogonal interval N of receiving terminal biorthogonal coupling prototype filter and the transmitting terminal biorthogonal moulding prototype filter stack that is shifted.
A kind of method of reseptance of fdma system may further comprise the steps successively:
Step is removed in protection at interval; be used for a serial incoming symbol data sequence is divided into the serial data sequence of predetermined length; and the protection interval of removing a length-specific of each serial data block head or afterbody, remove protection serial incoming symbol sequence of blocks of data at interval to generate.It can be that Cyclic Prefix is removed step that step is removed in this protection at interval; be used for the symbol sebolic addressing of importing being divided into the serial data block sequence that length is P according to the structure that transmits; and preceding C sampled value in each data block cast out, and forming length is the serial data block sequence of Q.
The data block spread step, being used at first the length of input is the data block head and the tail two ends cyclic extensions of Q, each adds that (L '-L)/2 zero, constituting length is the data block of E ', to form the string character sequence of blocks of data at expanded data piece two ends then.
Many subbands matched filtering step, each data block is carried out the waveform operation splitting in the described serial incoming symbol sequence of blocks of data, to generate the short symbol data piece of a plurality of length, and described a plurality of short symbol data pieces are carried out respectively and the corresponding subband matched filtering operation of the sub-band filter of emitter end, to generate a plurality of symbol sebolic addressings through subband matched filtering operation, described many subbands matched filtering step be filtered into the heterogeneous matched filtering of a biorthogonal, to carry out subband matched filtering operation through the sequence of serial/parallel conversion, the heterogeneous matched filtering coefficient of described biorthogonal obtains by same biorthogonal coupling prototype filtering displacement sampling.Described biorthogonal coupling prototype filter factor is { f
p %(n), n=0,1,2..., L '-1}, wherein L ' is a filter length, and L ' is not equal to transmitting terminal biorthogonal moulding prototype filter length L.Preferably, described L '＞L.Satisfy the biorthogonal condition between described biorthogonal coupling prototype filter and the filtering of transmitting terminal biorthogonal moulding prototype:
N is the shift-orthogonal interval, is constant.Described m the heterogeneous matched filter coefficient of biorthogonal is that the M times of down-sampling in biorthogonal coupling prototype filter coefficient initial value displacement m point back gets, and wherein M is a sub-band sum, and L ' is the integral multiple of M.
The subband solutions mapping step is used for the mode according to the mapping of transmitting terminal subband, takes out corresponding K point data from the process data block of phase shift;
Parallel/serial switch process is used for the sequence of blocks of data of input is carried out parallel/serial conversion operations.
Wherein, described many subbands matched filtering steps in sequence may further comprise the steps:
The waveform decomposition step, being used for from each length of input is the sequence of blocks of data of E ', presses the time interval of the sequence of blocks of data of transmitting terminal subband mapping output, the data serial output of L ' point is taken out in displacement.
Serial/parallel switch process is used for the sequence of blocks of data of serial input is converted to the parallel data block sequence;
M the heterogeneous matched filtering step of biorthogonal is used for carry out subband matched filtering operation through the sequence of serial/parallel conversion;
M down-sampling step is used for carry out the down-sampling operation through the data sequence of heterogeneous matched filtering;
The FFT shift step is used for the symbol sebolic addressing that M down-sampling step of input exported is carried out M point FFT conversion.
Claims (20)
1, a kind of emitter of fdma system, comprise that many sub-filters, data block form device, protection adding set at interval, it is characterized in that, described many sub-filters are used for that every way band parallel symbol sequence of blocks of data is carried out the subband multiphase filtering respectively to be handled, and described a plurality of parallel symbol sequence of blocks of data through subband multiphase filterings synthesize processing, with generation serial output symbol data sequence; It is characterized in that: the multiphase filter in described many sub-filters is the heterogeneous formed filter of biorthogonal, be used for the sequence through up-sampling is carried out the sub-band filter forming operation, the coefficient of wherein said multiphase filter is obtained by the displacement sampling by same biorthogonal moulding prototype filter coefficient.
2, the emitter of fdma system according to claim 1 is characterized in that, described biorthogonal prototype filter is for satisfying the linear phase FIR filter of subband spectrum characteristic arbitrarily.
3, the emitter of fdma system according to claim 1 is characterized in that, described biorthogonal prototype filter coefficient is { f
p(n), n=0,1,2..., L-1}, wherein L is a filter length, the frequency response of this biorthogonal prototype filter is a list band low pass frequency response.
4, the emitter of fdma system according to claim 3, it is characterized in that, the coefficient of described m heterogeneous formed filter is described biorthogonal moulding prototype filter coefficient initial value displacement m (m=0, M-1) back M times of down-sampling and getting, wherein L is the integral multiple of M, and M is a bank of filters sub-band sum order.
5, the emitter of fdma system according to claim 1 is characterized in that: described many sub-filters comprise successively and to connect:
The IFFT converting means is used for each parallel symbol sequence of blocks of data is carried out M point IFFT conversion, and element number is the parallel symbol sequence of blocks of data of M in the data block to generate;
M up-sampling device is respectively applied for M element in each data block in the described parallel symbol sequence of blocks of data carried out R times of up-sampling operation, to generate M string character sequence through up-sampling;
M the heterogeneous formed filter of biorthogonal is used for the sequence through up-sampling is carried out the sub-band filter forming operation;
Parallel/serial conversion equipment is used for the data from M the heterogeneous formed filter of biorthogonal of parallel input being carried out and going here and there conversion, with generation serial output symbol sequence;
The waveform synthesizer is used for above-mentioned serial output symbol sequence by the stack that is shifted of time interval of the sequence of blocks of data of subband mapping output.
6; a kind of receiving system of fdma system; comprise protection removal device at interval; the data block expanding unit; many subbands matched filter; described many subbands matched filter is used for described each data block of serial incoming symbol sequence of blocks of data and carries out the waveform operation splitting; to generate the short symbol data piece of a plurality of length; and described a plurality of short symbol data pieces are carried out respectively and the corresponding subband matched filtering operation of the sub-band filter of emitter end; to generate a plurality of symbol sebolic addressings through subband matched filtering operation; it is characterized in that: the filter of described many subbands matched filter is the heterogeneous matched filter of a biorthogonal; be used for carry out subband matched filtering operation through the sequence of serial/parallel conversion, the heterogeneous matched filter coefficient of described biorthogonal obtains by same biorthogonal coupling prototype filter displacement sampling.
According to the receiving system of the described fdma system of claim 6, it is characterized in that 7, the coefficient of described biorthogonal coupling prototype filter is
Wherein L ' is a filter length, and L ' can be not equal to transmitting terminal biorthogonal moulding prototype filter length L.
8, the receiving system of fdma system according to claim 7 is characterized in that, described L '＞L.
9, the receiving system of fdma system according to claim 6 is characterized in that, satisfies the biorthogonal condition between described biorthogonal coupling prototype filter and the transmitting terminal biorthogonal moulding prototype filter:
N is the shift-orthogonal interval, is constant.
10, the receiving system of fdma system according to claim 8, it is characterized in that, described m the heterogeneous matched filter coefficient of biorthogonal is that the M times of down-sampling in biorthogonal coupling prototype filter coefficient initial value displacement m point back gets, and wherein M is a sub-band sum, and L ' is the integral multiple of M.
11, the receiving system of multicarrier system according to claim 6 is characterized in that: described many subbands matched filter comprises successively and to connect:
The data block extraction element, being used for from each length of input is the sequence of blocks of data of E, by shift-orthogonal interval N, L ' data serial output is taken out in displacement.
Serial/parallel conversion equipment is used for the sequence of blocks of data of serial input is converted to the parallel data block sequence;
M the heterogeneous matched filter device of biorthogonal is used for carry out subband matched filtering operation through the sequence of serial/parallel conversion;
M downsampling device is used for carry out the down-sampling operation through the data sequence of heterogeneous matched filtering;
The FFT converting means is used for the symbol sebolic addressing that M downsampling device of input exported is carried out M point FFT conversion.
12, a kind of launching technique of fdma system, comprise many sub-band filters step, every way band parallel symbol sequence of blocks of data is carried out the subband multiphase filtering respectively to be handled, and described a plurality of parallel symbol sequence of blocks of data through subband multiphase filterings synthesize processing, with generation serial output symbol data sequence; It is characterized in that: be filtered into the heterogeneous molding filtration of biorthogonal in described many sub-band filters step, sequence through up-sampling is carried out the sub-band filter forming operation, and the coefficient of wherein said multiphase filtering is obtained by the displacement sampling by same biorthogonal moulding prototype filter factor.
13, the launching technique of fdma system according to claim 12 is characterized in that, described biorthogonal prototype filtering is adopted and satisfied the linear phase FIR filter that the subband spectrum characteristic requires arbitrarily.
14, the launching technique of fdma system according to claim 12 is characterized in that, described biorthogonal prototype filter factor is { f
p(n), n=0,1,2..., L-1}, wherein L is a filter length, the frequency response of this biorthogonal prototype filtering is a list band low pass frequency response.
15, the launching technique of fdma system according to claim 14 is characterized in that, described heterogeneous molding filtration coefficient is that the M times of down-sampling in described biorthogonal moulding prototype filter factor initial value displacement m point back gets, and wherein L is the integral multiple of M.
16, a kind of method of reseptance of fdma system, comprise many subbands matched filtering step, each data block is carried out the waveform operation splitting in the described serial incoming symbol sequence of blocks of data, to generate the short symbol data piece of a plurality of length, and described a plurality of short symbol data pieces are carried out respectively and the corresponding subband matched filtering operation of the sub-band filter of emitter end, to generate a plurality of symbol sebolic addressings through subband matched filtering operation, it is characterized in that: described many subbands matched filtering step be filtered into the heterogeneous matched filtering of a biorthogonal, to carry out subband matched filtering operation through the sequence of serial/parallel conversion, the heterogeneous matched filter coefficient of described biorthogonal obtains by same biorthogonal coupling prototype filter coefficient displacement sampling.
According to the method for reseptance of the described fdma system of claim 16, it is characterized in that 17, described biorthogonal coupling prototype filter factor is
Wherein L ' is a filter length, and L ' is not equal to transmitting terminal biorthogonal moulding prototype filter length L.
18, the method for reseptance of fdma system according to claim 17 is characterized in that, described L '＞L.
19, the method for reseptance of fdma system according to claim 16, satisfy the biorthogonal condition between described biorthogonal coupling prototype filter and the transmitting terminal biorthogonal moulding prototype filter:
N is the shift-orthogonal interval, is constant.
20, the method for reseptance of fdma system according to claim 16, it is characterized in that, described m the heterogeneous matched filter coefficient of biorthogonal is biorthogonal coupling prototype filter coefficient initial value displacement m (m=0, M-1) back M times of down-sampling and getting, wherein M is a sub-band sum, and L ' is the integral multiple of M.
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