CN100568863C - Emission, receiving system and method thereof based on many Methods of Subband Filter Banks - Google Patents

Emission, receiving system and method thereof based on many Methods of Subband Filter Banks Download PDF

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CN100568863C
CN100568863C CNB2005100302765A CN200510030276A CN100568863C CN 100568863 C CN100568863 C CN 100568863C CN B2005100302765 A CNB2005100302765 A CN B2005100302765A CN 200510030276 A CN200510030276 A CN 200510030276A CN 100568863 C CN100568863 C CN 100568863C
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data
sequence
subband
waveform
data block
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CN1941755A (en
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张小东
李明齐
周斌
卜智勇
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Shanghai Research Center for Wireless Communications
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Shanghai Institute of Microsystem and Information Technology of CAS
Shanghai Research Center for Wireless Communications
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Priority to PCT/CN2006/002347 priority patent/WO2007036134A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

The invention provides a kind of emission, receiving system and method thereof based on many Methods of Subband Filter Banks, transmitting terminal is by carrying out buffer memory to the waveform signal after too much Methods of Subband Filter Banks is synthesized processing, clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal, again truncated signal is carried out head and the tail circulation stack, obtain the transmission signals that time domain circulates from beginning to end.Can improve the efficiency of transmission of system by the hangover signal of clipping buffer memory waveform stem and afterbody, constitute the transmission signals that time domain circulates from beginning to end, can reduce the band that transmits and disturb outward, guarantee the orthogonality of many subband signals by stack that truncated signal is circulated.Correspondingly to input block head and the tail two ends cyclic extensions, the orthogonality that can recover to transmit reduces the distortion of signal to receiving terminal.

Description

Emission, receiving system and method thereof based on many Methods of Subband Filter Banks
Technical field
The present invention relates to a kind of emission, receiving system and method thereof, relate in particular to a kind of emission, receiving system based on the many Methods of Subband Filter Banks of time domain loop structure.
Background technology
In recent years, wireless communication system develops rapidly towards the broadband direction; Be accompanied by this development trend, the bandwidth that wireless communication system occupies is more and more higher, and transmission rate is more and more higher, and spectrum efficiency also requires more and more higher.In wideband wireless mobile communication system and broadband radio access network, require a plurality of users to insert simultaneously, need to adopt multiple access technology.Usually the multiple access technology that adopts mainly contains three kinds: frequency division multiple access, time division multiple access and code division multiple access.The frequency division multiple access technology is that user's information distribution is transmitted to the carrier channel of different frequency.Tdma is that different information distribution is transmitted to different time slots, and a carrier wave can transmit a plurality of users' information by time slot, and the number of users of transmission depends on the number of time slot.CDMA (Code Division Multiple Access) adopts spread spectrum communication mode, a plurality of users' of the pseudo noise code modulation that it can be different with transmission on the same carrier wave at one time signal.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.
At present, fdma system commonly used has two kinds, and a kind of is multi-carrier frequency division multiple access (MC-FDMA) system, and another kind is single-carrier frequency division multiple access (SC-FDMA) system.Based on the fdma system of multi-carrier modulation technology, it is low to have an implementation complexity, advantage such as the time-frequency granularity is little, and the frequency domain equalization complexity is little.Its major defect is a transmit signal power peak-to-average force ratio height, and Time and Frequency Synchronization required precision height is easily because the synchronous bad inter-user interference that causes influences the overall performance of communicating by letter.Therefore, multi-carrier frequency division multiple access (MC-FDMA) technology generally is used for the down link of wideband wireless mobile communication.Single-carrier frequency division multiple access is that put forward in the world in recent years a kind of both possessed single carrier communication low-power peak-to-average force ratio characteristic, possesses the novel fdma communication systems that multi-carrier communication is realized simple and scheduling of resource flexible nature again.Generally speaking, because each carrier wave is relatively independent in the single carrier-frequency division multiple access system, simultaneously the bandwidth of each carrier wave is much larger than the bandwidth of multi-carrier frequency division multiple access systems sub-carriers, make single carrier-frequency division multiple access system to the requirement of Time and Frequency Synchronization also far below multi-carrier frequency division multiple access systems.Therefore, the single-carrier frequency division multiple access technology is more suitable for the up link solution in wide-band mobile communication.
In communication system, be the distortion of the received signal that causes of compensation fading channel, utilize the estimated channel response at receiving terminal usually, the balanced signal that receives.In multi-address communication system, generally adopt the piece transmission means based on packet switching.Can adopt simple single-point frequency domain equalization to reduce the receiver complexity based on the piece transmission of Cyclic Prefix, can effectively support simultaneously many antennas to receive/send out transmission means, as single carrier-fdma system (SC-FDMA) that adopts frequency domain equalization and the multicarrier-fdma system (OFDMA) that adopts the orthogonal frequency division multiplexing multiple access technology.
In the existing frequency division multiple access technology based on many Methods of Subband Filter Banks, channel equalization can realize in subband, promptly the received signal of each subband after too much subband matched filtering is carried out equilibrium respectively; Also can outside subband, realize, promptly carry out equilibrium earlier to received signal after, recover the transmission signal of each subband through too much subband matched filtering then.For frequency domain equalization system in the subband, the data block transmitted in each subband is carried 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, thereby reduce the availability of frequency spectrum of system.For the system of the outer frequency domain equalization of subband, the signal of each subband transmission adds CP again after too much Methods of Subband Filter Banks moulding, so the subband formed filter can not reduce the effective length of CP, thereby can improve the spectrum efficiency of system.Yet for reducing the interference of intersubband, the transition band of the frequency response of subband should be precipitous as far as possible.At this moment, the prototype filter coefficient of many Methods of Subband Filter Banks correspondence will be very long, thereby cause the signal of many Methods of Subband Filter Banks outputs that very long hangover is arranged.If this signal is directly sent, the availability of frequency spectrum of system will be reduced greatly.For improving spectrum efficiency, after too much the signal of sub-band filter can pass through the waveform brachymemma earlier, send again.If directly will then can cause distorted signals on the one hand through the hangover in the signal of too much sub-band filter intercepting, cause the spectrum leakage that transmits on the other hand, cause the band of signal to disturb outward.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of emission based on many Methods of Subband Filter Banks, receiving system and method thereof, by to transmitting terminal through the stack that circulates of the too much truncated signal of sub-band filter, the availability of frequency spectrum of system can be improved on the one hand, distorted signals can be reduced on the other hand.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of emitter based on many Methods of Subband Filter Banks comprises:
Many Methods of Subband Filter Banks, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data and handles, and described a plurality of parallel symbol sequence of blocks of data through the subband multiphase filtering are carried out waveform synthesize processing, to generate serial output symbol data sequence; It is characterized in that, also comprise:
Waveform caching brachymemma device is used for the data sequence after synthetic through waveform is carried out buffer memory, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings;
Cycling wave form forms device, and truncated signal is carried out head and the tail circulation stack, makes that picked up signal is the continuous cycle signals of head and the tail.Wherein, described circulation stack is meant that the data header hangover signal that Waveform caching brachymemma device is clipped superposes after afterbody aligns with the tail data of truncated signal, and the data trailer hangover signal of simultaneously Waveform caching brachymemma device being clipped superposes after stem is alignd with the header data of truncated signal.
Further, should also comprise the protection interval adding set that is connected in after cycling wave form forms device, be used for adding the protection interval of a length-specific in the head or tail portion of cycling wave form sequence based on the emitter of many Methods of Subband Filter Banks.This protection adding set at interval can reduce interchannel interference.Like this, the present invention adopts the outer frequency domain equalization of subband, the signal of each subband transmission because of a little band formed filter can not reduce the effective length of Cyclic Prefix, thereby can improve the spectrum efficiency of system through too much adding Cyclic Prefix again after the Methods of Subband Filter Banks moulding.
Correspondingly, the present invention also provides a kind of receiving system based on many Methods of Subband Filter Banks, comprising:
Many subbands matched filter banks, each data block in the described serial incoming symbol sequence of blocks of data is carried 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, generating a plurality of symbol sebolic addressings, and before these many Methods of Subband Filter Banks, also be connected with through subband matched filtering operation:
The waveform cycle expanding unit is used for input block head and the tail two ends cyclic extensions is recovered the orthogonality that transmits.Can reduce the distortion of signal.
Accordingly, the present invention also provides a kind of launching technique based on many Methods of Subband Filter Banks, comprises the steps:
Many sub-band filters step, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data handles, 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;
Waveform caching brachymemma step is carried out buffer memory to the data sequence after synthetic through waveform, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings;
Cycling wave form forms step, and truncated signal is carried out head and the tail circulation stack, makes that picked up signal is the continuous cycle signals of head and the tail.
And a kind of method of reseptance based on many Methods of Subband Filter Banks comprises the steps:
The waveform cycle spread step is used for input block head and the tail two ends cyclic extensions is recovered the orthogonality that transmits;
Many subbands matched filtering step, each data block in the described serial incoming symbol sequence of blocks of data is carried 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.
Further, the present invention also provides a kind of emitter based on many Methods of Subband Filter Banks, comprising:
Many Methods of Subband Filter Banks, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data handles, 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; And
Be located at many Methods of Subband Filter Banks data block cyclic extensions device before, be used for D parallel symbol data block { c input k, k=0,1, ..., D-1} carries out the operation of data block cyclic extensions, and back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, to form D+C parallel symbol data block; C1=C2=C/2 wherein, C is less than D.
Be located at many Methods of Subband Filter Banks Waveform caching brachymemma device afterwards, described Waveform caching brachymemma device carries out buffer memory to data, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal, the length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.
Correspondingly, the present invention also provides a kind of launching technique based on many Methods of Subband Filter Banks, comprises the steps:
The cyclic extensions step, D parallel symbol data block of input carried out the operation of data block cyclic extensions, back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, to form D+C parallel symbol data block;
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;
Waveform caching brachymemma step, data are carried out buffer memory, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal, the length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.
From the analogous diagram of Fig. 9 as can be seen: adopt the fdma system of many Methods of Subband Filter Banks of the present invention can obtain errored bit performance preferably.From the spectrogram of the list band signal of Figure 10 as can be seen: adopt the attenuation outside a channel of the frequency spectrum attenuation outside a channel of time domain cycle signal of the present invention significantly better than the acyclic signal of time domain of direct brachymemma.
Description of drawings
Fig. 1 is the structural representation of the emitter based on many Methods of Subband Filter Banks of the present invention.
Fig. 2 is that the waveform of cycling wave form formation step of the present invention blocks and cycling wave form forms schematic diagram.
Fig. 3 is the structural representation of the receiving system based on many Methods of Subband Filter Banks of the present invention.
Fig. 4 is the schematic diagram of waveform cycle spread step of the present invention.Fig. 5 the present invention is based on the emission of many Methods of Subband Filter Banks, the simulation block diagram of method of reseptance.
Fig. 6 is the structural representation of the emitter of another embodiment of the present invention.
Fig. 7 is an another embodiment of the present invention cyclic extensions schematic diagram
Fig. 8 is that the waveform of another embodiment of the present invention blocks schematic diagram.
Fig. 9 is a systematic bits error performance simulation result schematic diagram of the present invention.
Figure 10 is a system of the present invention list band frequency spectrum simulation result schematic diagram.
Embodiment
Fig. 1 illustrate a kind of according to the present invention the block diagram based on the transmitter of the fdma system of the many Methods of Subband Filter Banks of time domain loop structure of an embodiment.Comprising a data block segmenting device 10, go here and there and conversion equipment 11 for one, the FFT converting means 12 that K is ordered, a subband mapping device 13, the IFFT converting means 14 that M is ordered, 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), a parallel/serial conversion equipment 17, a waveform synthesizer 18,19, one cycling wave forms of a Waveform caching brachymemma device form device 20 and a Cyclic Prefix adding set 21.Wherein, the IFFT converting means 14 that M is ordered, 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), a parallel/serial conversion equipment 17 and the many Methods of Subband Filter Banks of waveform synthesizer 18 common formations, it carries out the processing of subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data these many Methods of Subband Filter Banks, 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.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.
Suppose { a n, n=0,1,2....} is the serial modulated symbols sequence that is input to the data block segmenting device 10 of transmitter;
Data block segmenting device 10 is used for symbol modulated string character data sequence { a n, n=0,1,2....} is divided into string character sequence of blocks of data { b m, m=0,1,2....}, here, b mRepresent that a number of elements equals the row vector of D * K, wherein D be the waveform number of stack in the waveform synthesizer 18 thereafter, and K is the counting of FFT conversion in the FFT converting means 12 thereafter.Because emitter is identical and is independently the operation of each string character data block of input, therefore only describes the operation to a serial data block of emission and receiving system in scheme is thereafter described.
String and conversion equipment 11 are used for string character sequence of blocks of data { b m, m=0,1, each data block is gone here and there and conversion operations among the 2....}, to form D parallel symbol data block { c k, k=0,1 ..., D-1}, here, c kRepresent a number of elements and the same column vector of FFT transform size K;
FFT converting means 12 is used for each the parallel symbol data block { c to input k, k=0,1 ..., D-1} carries out K point FFT conversion, generates corresponding a plurality of symbol data piece.Through the FFT conversion module, the sequence of blocks of data { c that input is parallel k, k=0,1 ..., D-1} is transformed into corresponding data block sequence { d k, k=0,1 ..., D-1}, relation is each other obeyed d k=FFT (c k), here, d kAlso represent a column vector that number of elements is the same with the FFT transform size.FFT transform size K equals to transmit required number of sub-bands, and can carry out the self adaptation adjustment according to the required transmission rate of communication system.
Subband mapping device 13 is used for the data block d through FFT conversion output kIn each element be mapped to respectively on the corresponding subband and transmit, for the subband transmission 0 that does not have data map.The mode of mapping can be the Continuous Mappings mode, soon each element map in the data block is to the continuously arranged a plurality of subbands of frequency spectrum upper frequency, also can be the Discrete Mapping mode, soon each element map in the data block be to the spaced a plurality of subbands of frequency spectrum upper frequency.Through the subband mapping device, the sequence of blocks of data { d that input is parallel k, k=0,1 ..., D-1} is transformed into corresponding data block sequence { e k, k=0,1 ..., D-1}, e kRepresent that also a number of elements is the column vector of M, wherein M is the size of IFFT conversion in the IFFT converting means 14, that is the total number of sub-bands of many Methods of Subband Filter Banks.
The IFFT converting means 14 that M is ordered is used for each the parallel symbol sequence of blocks of data { e to input k, k=0,1 ..., D-1} carries out the IFFT conversion that M is ordered.The IFFT conversion M that counts equals sub-band sum, and M is more than or equal to the K that counts of FFT conversion in the FFT converting means 11, and preferably, M is the integral multiple of K.Through the IFFT conversion module, the parallel sequence of blocks of data of input is transformed into corresponding data block sequence { g k, k=0,1 ..., D-1}, 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.
M up-sampling device 150,151,152 ..., be respectively applied for 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 parallel data block 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 ..., D-1}.
M multiphase filtering apparatus 160,161 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 multiphase filtering apparatus is got by the displacement sampling by same prototype filter coefficient.Particularly, suppose that 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 frequency response of list low-pass filter.This filter satisfies the shift-orthogonal condition: Σ n = 0 L - 1 f p ( n ) f p * ( n - kN ) = δ ( k ) , Wherein L is a filter length, and N is filter shift-orthogonal interval, that is the up-sampling rate of many Methods of Subband Filter Banks.Then m (m=0,1 ..., M-1) individual multiphase filter coefficient for this 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.Behind the multiphase filtering apparatus, k output sequence constantly of m multiphase filter is { i k m(n), n=0,1,2..., L/M-1; K=0,1 ..., D-1}.
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 { j k(n), n=0,1,2..., L-1; K=0,1 ..., D-1}, { j here k(n) } be expressed as the serial data block that block length is L.
Waveform synthesizer 18, be used for and the sequence of blocks of data of string conversion output by the N stack that is shifted at interval of the shift-orthogonal of the prototype filter of multiphase filter correspondence.Particularly, at k constantly, with k-1 constantly the length that generates of waveform synthesizer be that the preceding N point data of the data sequence of L sends, get remaining L-N point data again, after afterbody adds N zero, with k constantly and the L point data piece { j of string conversion output k(n), n=0,1,2..., the L-1} addition constitutes new L point data sequence; And k+1 constantly will this newly-generated L point sequence preceding N point data send, get remaining L-N point data again, after afterbody adds N zero, with k+1 constantly and the L point data piece { j that exports of string conversion K+1(n), n=0,1,2..., the L-1} addition constitutes the data updated sequence.So go round and begin again.Through the waveform synthesizer, output sequence is { k (n), n=0,1,2..., E-1}.Wherein, k ( n ) = Σ k = 0 D - 1 Σ m = 0 M - 1 e k ( m ) f p ( n - kN ) exp ( j 2 πm ( n - kN ) / M ) , { f p(n), n=0,1,2..., L-1} are the prototype filter of multiphase filter correspondence, e kSequence of blocks of data for 13 outputs of subband mapping device.Obviously, the length of sequence k (n) is E=(D-1) * N+L, and wherein L is a prototype filter length, and N is prototype filter shift-orthogonal interval;
Waveform caching brachymemma device 19 is used for the data sequence after synthetic through waveform is carried out buffer memory, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings.
Cycling wave form forms device 20, and truncated signal is carried out head and the tail circulation stack, makes that picked up signal is the signal of the continuous circulation of head and the tail, and the operation of described Waveform caching brachymemma device 19 and cycling wave form formation device 20 as shown in Figure 2.At first, buffer storage length is the synthetic back of the waveform output sequence of E.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=D * N.Select D 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 n, n=0,1 ..., Q-1}.Because Q is the prototype filter shift-orthogonal integral multiple of N at interval, sequence { l n, n=0,1 ..., Q-1} is the continuous cyclic sequences of head and the tail;
Protection is adding set at interval, and the protection that the head or tail portion in the cycling wave form sequence of being used for adds a length-specific is used to reduce interchannel interference (preferably, this protection length at 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 21, and a part that also 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 data sequence { l n, n=0,1 ..., Q-1} is transformed into complete data block symbols sequence { m n, n=0,1 ..., P-1}, wherein, P=Q+C, C are circulating prefix-length.
Fig. 3 illustrate a kind of according to the present invention the block diagram based on the receiving system of the fdma system of the many Methods of Subband Filter Banks of time domain loop structure of an embodiment.Comprising a Cyclic Prefix removal device 30, a waveform cycle expanding unit 31, a waveform decomposer 32, a serial/parallel conversion equipment 33, M heterogeneous matched filter device (for simplicity's sake, only illustrate three 340 among Fig. 1,341 and 342), M downsampling device (for simplicity's sake, only illustrate three 350,351 and 352 among Fig. 1), the FFT converting means 36 that M is ordered, the IFFT converting means 38 that 37, one K of a subband solutions mapping device are ordered and a parallel/serial conversion equipment 39.Wherein, a waveform decomposer 32, a serial/parallel conversion equipment 33, M heterogeneous matched filter device (for simplicity's sake, only illustrate three 340 among Fig. 1,341 and 342), M downsampling device (for simplicity's sake, only illustrate three 350 among Fig. 1,351 and 352) and M FFT converting means of ordering 36 is common constitutes many subbands matched filter banks, this many subbands matched filter banks is carried out the waveform operation splitting with each data block 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.
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 the receiver ideal synchronisation, and supposition s (n), and n=0,1 ..., P-1} is the string character sequence that is input to the Cyclic Prefix removal device 30 of receiver;
Cyclic Prefix removal device 30 is used for adding rule according to the transmitting terminal Cyclic Prefix, C sampled value before in the data block cast out, formation length be Q serial data sequence o (k), k=0,1,2 ..., Q-1};
Waveform cycle expanding unit 31 is used to finish the transmitting terminal cycling wave form and forms device 19 corresponding inverse operations, and promptly the length to defeated people is the data block head and the tail two ends cyclic extensions of Q, and it is operated as Fig. 4.Suppose that herein length 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, again with F1 the stem that sampled value is added Q point data piece to of Q point data piece afterbody, string character data sequence { the p (n) that to form a length be E (E=F1+Q+F2), n=0,1,2 ..., E-1};
Waveform decomposer 32, be used to finish transmitting terminal waveform synthesizer 18 corresponding inverse operations, promptly the length from input is the sequence of blocks of data of E, presses the shift-orthogonal interval N of the prototype filter of transmitting terminal multiphase filter correspondence, and the serial data that L is ordered is taken out in displacement.Particularly, suppose,, take out data block { p (n) since the 0th the 0th moment, n=0,1,2 ..., L point data in foremost among the E-1} then the 1st moment, since the N point, is taken out data block { p (n), n=0,1,2, ..., L point data among the E-1}, and the like, n constantly, since the n * N point, takes out L point data in the data block.D-1 constantly, since (D-1) * N point, takes out last L point data in the data block.Through the waveform decomposer, form string character sequence of blocks of data { q k, k=0,1 ..., D-1}.Here, q kRepresent that a number of elements is the row vector of L;
Serial/parallel conversion equipment 33 is used for the sequence of blocks of data { q with the serial input k, k=0,1 ..., each length among the D-1} is that the capable vector of L is converted to L/M parallel data block, and each data block has M element.Through string and conversion, be output as parallel data block sequence { r K, n(m), n=0,1 ..., M-1; N=0,1 ..., L/M-1; K=0,1 ..., D-1}; Heterogeneous matched filter device 340,341 and 342 is respectively applied for the sequence { r through serial/parallel conversion K, nCarry out subband matched filtering operation.Each heterogeneous matched filter { f wherein 0, m %(n), n=0,1,2..., L/M-1, m=0,1 ..., M-1} is each multiphase filter of transmitting terminal { f 0m(n), n=0,1,2..., L/M-1, m=0,1 ..., the corresponding matched filter of M-1}.Through heterogeneous matched filtering, the output sequence of m heterogeneous matched filter is { t K, m(n), n=0,1 ..., L/M-1; M=0 ..., M-1; K=0,1 ..., D-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.Wherein, R=L/M.Particularly, downsampling device takes out R-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 ..., D-1}.
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 ..., D-1} carries 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 ..., D-1}, relation is each other obeyed v k=FFT (u k), here, u k=[u K, 0u K, 1... u K, M-1] T, subscript " T " expression transposition, 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 13.Promptly according to the mode of transmitting terminal subband mapping, from data block v through the FFT conversion 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 ..., D-1}, here, x kRepresent that also a number of elements is the column vector of K.
IFFT converting means 38 is used for the sequence of blocks of data { x to input k, k=0,1 ..., D-1} carries out the IFFT conversion that K is ordered.Through the IFFT converting means, the sequence of blocks of data { x that input is parallel k, k=0,1 ..., D-1} is transformed into corresponding data block sequence { y k, k=0,1 ..., D-1}, relation is each other obeyed y k=IFFT (x k), here, y kAlso represent a number of elements and the same column vector of IFFT transform size K.
Parallel/serial conversion equipment 39 is used for the sequence of blocks of data { y to input k, k=0,1 ..., D-1} carries out parallel/serial conversion operations.Through parallel/serial conversion equipment, be output as serial data symbol sebolic addressing { z m, m=0,1 ..., D * K-1} is used for the symbol demodulation and the decoding of receiving terminal, to recover the information bit of emission.
In conjunction with shown in Figure 5, emission and the method for reseptance based on many Methods of Subband Filter Banks of the present invention comprises the steps:
A kind of launching technique based on many Methods of Subband Filter Banks comprises the steps:
Many sub-band filters step, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data handles, 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;
Waveform caching brachymemma step is carried out buffer memory to the data sequence after synthetic through waveform, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings;
Cycling wave form forms step, and truncated signal is carried out head and the tail circulation stack, makes that picked up signal is the continuous cycle signals of head and the tail.
Described many sub-band filters step comprises:
The IFFT shift step that M is ordered is carried out the IFFT conversion that M is ordered to each parallel symbol sequence of blocks of data of input;
M up-sampling step to carry out R times of up-sampling operation through each element in the data block of IFFT conversion, promptly added R-1 individual zero respectively in each element back;
M multiphase filtering step carried out the sub-band filter forming operation to the sequence through up-sampling respectively, and the coefficient of its multiphase filtering is got by the displacement sampling by same prototype filter coefficient;
Parallel/serial switch process carries out the data from M multiphase filter group of parallel input and goes here and there conversion;
The waveform synthesis step, with and the sequence of blocks of data of string conversion output by the stack that is shifted at interval of the shift-orthogonal of prototype filter, formation L point data sequence.
Described Waveform caching brachymemma step and cycling wave form form step and specifically comprise: at first, buffer storage length is the output sequence after the waveform of E synthesizes, 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; 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 of Q.
Described Q=D * N selects D and N, makes Q 〉=L-N, and F1 and F2 should equate as far as possible that wherein D is the waveform number that superposes in the waveform synthesis step, N be the prototype filter shift-orthogonal at interval.
A kind of method of reseptance based on many Methods of Subband Filter Banks comprises the steps:
The waveform cycle spread step is used for input block head and the tail two ends cyclic extensions is recovered the orthogonality that transmits;
Many subbands matched filtering step, each data block in the described serial incoming symbol sequence of blocks of data is carried 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.
Described many subbands matched filtering step comprises the steps:
The waveform decomposition step is finished the corresponding inverse operation of transmitting terminal waveform synthesizer, promptly from the sequence of blocks of data of input, is shifted at interval by the shift-orthogonal of the prototype filter of transmitting terminal multiphase filter correspondence and takes out the serial data that L is ordered;
Serial/parallel switch process be used for the capable vector of each L of the sequence of blocks of data of serial input is converted to by L/M parallel data block, and each data block has M element;
M heterogeneous matched filtering step is respectively to carrying out subband matched filtering operation through the sequence of serial/parallel conversion;
M down-sampling step is used for carry out R times of down-sampling operation through the data sequence of heterogeneous matched filtering;
M point FFT converting means is used for the symbol sebolic addressing that each downsampling device of input is exported is carried out M point FFT conversion.
Described waveform cycle spread step is specially the afterbody that stem F2 sampled value of Q point data piece is added to Q point data piece, again with F1 the stem that sampled value is added Q point data piece to of Q point data piece afterbody;
Shown in Fig. 6,7,8 is another embodiment of the present invention, and only the scheme that forms of cycling wave form is different with embodiment 1 in the present embodiment, and other structures and method are all identical with embodiment 1, has just repeated no more in this part identical with embodiment 1:
In the present embodiment, between string and conversion equipment 11 and FFT converting means 12, be provided with data block cyclic extensions device 22, be used for D parallel symbol data block { c input k, k=0,1, ..., D-1} carries out the operation of data block cyclic extensions, and back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, with form D+C parallel symbol data block c ' k, k=0,1 ..., D+C-1}.Concrete operating process as shown in Figure 7.C1=C2=C/2 wherein, C is less than D; Here, c ' kRepresent a number of elements and the same column vector of FFT transform size K;
Correspondingly, being provided with Waveform caching brachymemma device 19 between waveform synthesizer 18 and Cyclic Prefix adding set 21 (compares with embodiment 1, lacked cycling wave form herein and formed device 20), described Waveform caching brachymemma device carries out buffer memory to data, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal.The length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.Its operating process as shown in Figure 8.
At first, buffer storage length is the synthetic back of the waveform output sequence of E '.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 '.Obviously, owing to be D+C parallel symbol data block with D parallel symbol data block cyclic extensions of transmission in the data block cyclic extensions device 22, therefore, the length of the sequence k (n) that waveform synthesizer 18 is exported is E '=(D+C-1) * N+L.Select Q=D * N, like this F1 '+F2 '=(C-1) * N+L.Select D and N, make that Q 〉=L-N and selection F1 '=F2 ' or F1 ' and F2 ' value are approaching as far as possible.Because Q is the at interval integral multiple of N of prototype filter shift-orthogonal, and the signal of many Methods of Subband Filter Banks input is the signal of cyclic extensions, thereby makes that the length of intercepting is the data sequence { l of Q n, n=0,1 ..., Q-1} is the continuous cyclic sequences of head and the tail;
Accordingly, be provided with data block cyclic extensions step between string and switch process and the FFT shift step in the present embodiment, to D parallel symbol data block { c of input k, k=0,1, ..., D-1} carries out the operation of data block cyclic extensions, and back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, with form D+C parallel symbol data block c ' k, k=0,1 ..., D+C-1}.
Accordingly, being provided with Waveform caching brachymemma step between waveform synthesizer step and Cyclic Prefix interpolation step (compares with embodiment 1, lacked cycling wave form herein and formed step), described Waveform caching brachymemma step is carried out buffer memory to data, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal.The length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.
The data and the embodiment 1 that launch owing to transmitting terminal in the present embodiment are identical, so also identical with embodiment 1 with method of reseptance in its structure of receiving terminal.

Claims (18)

1, a kind of emitter based on many Methods of Subband Filter Banks comprises:
Many Methods of Subband Filter Banks, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data and handles, and described a plurality of parallel symbol sequence of blocks of data through the subband multiphase filtering are carried out waveform synthesize processing, to generate serial output symbol data sequence; It is characterized in that, also comprise:
Waveform caching brachymemma device is used for the data sequence after synthetic through waveform is carried out buffer memory, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings;
Cycling wave form forms device, truncated signal is carried out head and the tail circulation stack, make that picked up signal is the continuous cycle signals of head and the tail, wherein, described circulation stack is meant that the data header hangover signal that Waveform caching brachymemma device is clipped superposes after afterbody aligns with the tail data of truncated signal, and the data trailer hangover signal of simultaneously Waveform caching brachymemma device being clipped superposes after stem is alignd with the header data of truncated signal.
2, the emitter based on many Methods of Subband Filter Banks according to claim 1; it is characterized in that; also comprise the protection interval adding set that is connected in after cycling wave form forms device, it is used for adding in the head or tail portion of cycling wave form sequence the protection interval of a length-specific.
3, the emitter based on many Methods of Subband Filter Banks according to claim 2; it is characterized in that; described protection adding set at interval is the Cyclic Prefix adding set, and it is used for the part of described data block afterbody is copied to its front end, forms the data block symbols of band Cyclic Prefix.
4, according to claim 1 or 2 or 3 described emitters, it is characterized in that described many Methods of Subband Filter Banks comprise based on many Methods of Subband Filter Banks:
The IFFT converting means that M is ordered is used for each parallel symbol sequence of blocks of data of input is carried out the IFFT conversion that M is ordered;
M up-sampling device is respectively applied for carry out R times of up-sampling operation through each element in the data block of IFFT conversion, promptly adds R-1 zero in each element back, R=L/M wherein, and L is the length of the prototype filter of multiphase filter correspondence;
M multiphase filtering apparatus is respectively applied for the sequence through up-sampling carried out the sub-band filter forming operation, and wherein the coefficient of each multiphase filtering apparatus is got by the displacement sampling by same prototype filter coefficient;
Parallel/serial conversion equipment is used for the data from M multiphase filter group of parallel input being carried out and going here and there conversion;
The waveform synthesizer, be used for and the sequence of blocks of data of string conversion output by the stack that is shifted at interval of the shift-orthogonal of the prototype filter of multiphase filter correspondence, formation E point data sequence.
5, according to claim 1 or 2 or 3 described emitters, it is characterized in that, also comprise before described many Methods of Subband Filter Banks based on many Methods of Subband Filter Banks:
The data block segmenting device is used for symbol modulated string character data sequence is divided into the string character sequence of blocks of data;
String and conversion equipment are used for each data block of string character sequence of blocks of data is gone here and there and conversion operations, to form the parallel symbol sequence of blocks of data;
The FFT converting means is used for each parallel symbol data block of input is carried out K point FFT conversion, generates corresponding a plurality of symbol data piece;
The subband mapping device is used for being mapped to respectively on the corresponding subband through each element of the data block of FFT conversion output and transmits, for the subband transmission 0 that does not have data map.
6, a kind of receiving system based on many Methods of Subband Filter Banks comprises:
Many subbands matched filter banks, each data block in the serial incoming symbol sequence of blocks of data is carried 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, before this many subbands matched filter banks, also be connected with:
The waveform cycle expanding unit is used for input block head and the tail two ends cyclic extensions, the orthogonality that recovery transmits, described waveform cycle spread step is specially: add stem F2 sampled value of Q point data piece the afterbody of Q point data piece to, again with F1 the stem that sampled value is added Q point data piece to of Q point data piece afterbody.
7, the receiving system based on many Methods of Subband Filter Banks according to claim 6, it is characterized in that, comprise that also one is connected in the preceding Cyclic Prefix removal device of waveform cycle expanding unit, be used for adding rule according to the transmitting terminal Cyclic Prefix, preceding certain-length sampled value in the data block is cast out, formed serial data sequence.
According to claim 6 or 7 described receiving systems, it is characterized in that 8, described many subbands matched filter banks comprises successively and to connect based on many Methods of Subband Filter Banks:
The waveform decomposer is used to finish the corresponding inverse operation of transmitting terminal waveform synthesizer, promptly from the sequence of blocks of data of input, is shifted at interval by the shift-orthogonal of the prototype filter of transmitting terminal multiphase filter correspondence and takes out the serial data that L is ordered;
Serial/parallel conversion equipment, the capable vector that is used for each length with the sequence of blocks of data of serial input and is L is converted to L/M parallel data block, and each data block has M element;
M heterogeneous matched filter device is respectively applied for carry out subband matched filtering operation through the sequence of serial/parallel conversion;
M downsampling device is used for carry out R times of down-sampling operation through the data sequence of heterogeneous matched filtering;
M point FFT converting means is used for the symbol sebolic addressing that each downsampling device of input is exported is carried out M point FFT conversion.
9, the receiving system based on many Methods of Subband Filter Banks according to claim 8 is characterized in that, also is connected with in turn behind the described M point FFT converting means:
The subband solutions mapping device is used to finish the opposite inverse operation of transmitting terminal subband mapping device, takes out corresponding K point data from the data block of process FFT conversion;
The IFFT converting means is used for the sequence of blocks of data of input is carried out the IFFT conversion that K is ordered;
Parallel/serial conversion equipment is used for the sequence of blocks of data of input is carried out parallel/serial conversion operations.
10, a kind of emitter based on many Methods of Subband Filter Banks comprises:
Many Methods of Subband Filter Banks, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data handles, 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; It is characterized in that, also comprise:
Be located at many Methods of Subband Filter Banks data block cyclic extensions device before, be used for D parallel symbol data block of input carried out the operation of data block cyclic extensions, back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, to form D+C parallel symbol data block, C1=C2=C/2 wherein, C is less than D;
And, be located at many Methods of Subband Filter Banks Waveform caching brachymemma device afterwards, described Waveform caching brachymemma device carries out buffer memory to data, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal, the length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.
11, a kind of launching technique based on many Methods of Subband Filter Banks comprises the steps:
Many sub-band filters step, it carries out the subband multiphase filtering respectively with every way band parallel symbol sequence of blocks of data handles, 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;
Waveform caching brachymemma step is carried out buffer memory to the data sequence after synthetic through waveform, clips the hangover signal of data header and afterbody, obtains truncated signal; The length of truncated signal is the shift-orthogonal integral multiple at interval of the prototype filter of many Methods of Subband Filter Banks employings;
Cycling wave form forms step, truncated signal is carried out head and the tail circulation stack, make that picked up signal is the continuous cycle signals of head and the tail, described circulation stack is meant that the data header hangover signal that Waveform caching brachymemma device is clipped superposes after afterbody aligns with the tail data of truncated signal, and the data trailer hangover signal of simultaneously Waveform caching brachymemma device being clipped superposes after stem is alignd with the header data of truncated signal.
12, the launching technique based on many Methods of Subband Filter Banks according to claim 11 is characterized in that, described many sub-band filters step comprises:
The IFFT shift step that M is ordered is carried out the IFFT conversion that M is ordered to each parallel symbol sequence of blocks of data of input;
M up-sampling step to carry out R times of up-sampling operation through each element in the data block of IFFT conversion, promptly added R-1 individual zero respectively in each element back;
M multiphase filtering step carried out the sub-band filter forming operation to the sequence through up-sampling respectively, and the coefficient of its multiphase filtering is got by the displacement sampling by same prototype filter coefficient;
Parallel/serial switch process carries out the data from M multiphase filter of parallel input and goes here and there conversion;
The waveform synthesis step, with and the sequence of blocks of data of string conversion output by the stack that is shifted at interval of the shift-orthogonal of the prototype filter of multiphase filter correspondence, formation L point data sequence.
13, according to claim 11 or 12 described launching techniques based on many Methods of Subband Filter Banks, it is characterized in that, described Waveform caching brachymemma step and cycling wave form form step and specifically comprise: at first, buffer storage length is the output sequence after the waveform of E synthesizes, 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; 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 continuous cycling wave form sequence of head and the tail of Q.
14, the launching technique based on many Methods of Subband Filter Banks according to claim 13, it is characterized in that, described Q=D * N, select D and N, make Q 〉=F1+F2, and F1 and F2 should equate as far as possible that wherein D is the waveform number that superposes in the waveform synthesis step, and N is prototype filter shift-orthogonal interval.
15, a kind of method of reseptance based on many Methods of Subband Filter Banks comprises the steps:
The waveform cycle spread step is used for input block head and the tail two ends cyclic extensions, the orthogonality that recovery transmits, described waveform cycle spread step is specially: add stem F2 sampled value of Q point data piece the afterbody of Q point data piece to, again with F1 the stem that sampled value is added Q point data piece to of Q point data piece afterbody;
Many subbands matched filtering step, each data block in the serial incoming symbol sequence of blocks of data is carried 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.
16, the method for reseptance based on many Methods of Subband Filter Banks according to claim 15 is characterized in that, described many subbands matched filtering step comprises the steps:
The waveform decomposition step is finished the corresponding inverse operation of transmitting terminal waveform synthesizer, promptly from the sequence of blocks of data of input, is shifted at interval by the shift-orthogonal of the prototype filter of transmitting terminal multiphase filter correspondence and takes out the serial data that L is ordered;
Serial/parallel switch process, the capable vector that is used for each length with the sequence of blocks of data of serial input and is L is converted to L/M parallel data block, and each data block has M element;
M heterogeneous matched filtering step is respectively to carrying out subband matched filtering operation through the sequence of serial/parallel conversion;
M down-sampling step is used for carry out R times of down-sampling operation through the data sequence of heterogeneous matched filtering;
M point FFT converting means is used for the symbol sebolic addressing that each downsampling device of input is exported is carried out M point FFT conversion.
17, a kind of launching technique based on many Methods of Subband Filter Banks comprises the steps:
Data block cyclic extensions step, D parallel symbol data block of input carried out the cyclic extensions operation, back C1 the symbol data piece that is about in D data block adds to before D the data block, and preceding C2 symbol data piece of D data block added to after D the data block, to form D+C parallel symbol data block, C1=C2=C/2 wherein, C is less than D;
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;
Waveform caching brachymemma step, data are carried out buffer memory, and clip the hangover signal of buffer memory waveform stem and afterbody, obtain truncated signal, the length of truncated signal is the prototype filter shift-orthogonal integral multiple of N at interval, thereby makes truncated signal become the continuous cycle signal of head and the tail.
18, the launching technique based on many Methods of Subband Filter Banks according to claim 17, it is characterized in that, described Waveform caching brachymemma step, with the length of buffer memory is that the data sequence of E ' is divided into length and is respectively F1 ', the three segment data pieces of Q and F2 ', make E '=F1 '+Q+F2 ', E '=(D+C-1) * N+L wherein, L is the length of the prototype filter of multiphase filter correspondence, select Q=D * N, F1 '+F2 '=(C-1) * N+L like this, selection D and N, make and select F1 '=F2 ' or F1 ' and F2 ' value approaching as far as possible by Q 〉=L-N.
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