CN1735079A - Space channel coding and decoding method and device for realizing multipath parallel transmission - Google Patents
Space channel coding and decoding method and device for realizing multipath parallel transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
- H04L1/006—Trellis-coded modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
Abstract
The code method for space channel comprises steps: inputting a set of serial data for code by predetermined communication speed; coding the data with opposite criterion to output multiplex parallel code data; wherein, there is correlated redundant information among coding signal; sending the said signal by a plurality of emission antenna. Thereby, it needs just a receiving antenna to decode for multiplex signal and increases data transmission speed for the system.
Description
Invention field
The present invention relates to a kind of method and device of in wireless communication system, realizing the multidiameter delay transfer of data, relate in particular to a kind of method and apparatus that adopts space channel coding and decoding method to realize the multidiameter delay transmission.
Technical background
Universal day by day along with mobile communication, simple moving speech communication can not satisfy the needs that people obtain information, and the mobile data communication business with its can provide office, amusement, etc. more convenient and amount of information abundant content and show huge development prospect more.Thereby the high-speed packet data service (HPDS) of the data high-speed that provides support transmission particularly provides the high-speed data service on the down link from the base station to the user terminal to become one of main target of future broadband wireless communication systems.
Traditional single-antenna wireless communication system adopts the multiplexing transmission rate that improves data service to frequency band, time slot and spreading code usually.For example, in multicarrier system, system distributes a plurality of frequency ranges for each user, and then the signal multiplexing of different frequency range is together sent together.And in time-division multiple address system, system also can be with the together transmission in different time slots of different user information distribution.In addition, system can also adopt the code division multiplexing mode.Fig. 1 shows the transmitter and receiver structure of traditional 3GPP UMTS FDD a single aerial system.As shown in Figure 1, in transmitter, data to be sent through convolution/Turbo (convolution or Turbo) codings (that is chnnel coding), interweave and sign map after, priority multiplies each other with OVSF (Orthogonal Variable Spreading Factor OVSF) sign indicating number and scrambler, thereby obtains the subscriber signal through spread spectrum and scrambling processing.Like this, a plurality of code channel signals behind the spread spectrum just can be multiplexing in identical frequency band by sign indicating number branch mode, and by pulse shaping and RF modulation, form radiofrequency signal.In receiver, after radiofrequency signal process RF, RRC filtering (root-raised cosine filtering) and the over-sampling processing via the antenna reception, send into the characteristic of channel that estimates a plurality of parallel transmission channels in the channel estimating unit.Then, despreading and detecting unit are finished under the condition of despreading, utilize this channel estimation results to detect received signal again.Then, detected mark signal finally obtains required bit signal through symbol de-maps, deinterleaving and convolution/Turbo process of decoding.In the structure of as shown in Figure 1 transmitter and receiver, by code division multiplexing, the signal of a plurality of data flow is multiplexed in the same frequency range, thereby can reach the purpose that improves message transmission rate equally.
Yet, growing along with radio communication, available frequency band, time slot and spread spectrum code resources are very limited in the legacy communications system, if will further improve the transmission rate of data, a kind of solution is rationally to utilize space resources.The Multiple Input Multiple Output (MIMO) that proposes utilizes a plurality of antennas that transmit and receive just in the recent period, spatially constructs a plurality of parallel wireless channels, thereby by making full use of space resources, improves the message transmission rate of system.In existing MIMO technology, bell lab layered space-time (BLAST:Bell LabLayered Space Time) technology can improve message transmission rate significantly with it, and becomes one of typical MIMO technology.
The BLAST technology has multiple structure, wherein, do not have redundant information, thereby can utilize space channel transmission data substantially owing to send in the signal not with the BLAST structure of any chnnel coding, but regrettably, the signal transmission quality of this BLAST structure is lower.In order to improve signal quality, in the 3GPP UMTS FDD of employing BLAST structure shown in Figure 2 system, added the chnnel coding unit, i.e. convolution/Turbo encoder, its function is identical with convolution/Turbo encoder shown in Figure 1 with effect.Compared to Figure 1, in the BLAST transmitter shown in Fig. 2, one road data to be sent are sent into BLAST unit 310 through after the processing of convolution/Turbo encoder, interleaver and sign map unit; In BLAST unit 310, one road data to be sent are split into a plurality of independently sub data flows; A plurality of then sub data flows carry out spread spectrum and scrambling separately to be handled, and superposes with other code channel signals respectively, obtains multi-path parallel signal; These parallel signals pass through the modulation of pulse shaping and RF more respectively, give receiving terminal via a plurality of transmission antennas transmit at last.At receiving terminal, receiver utilizes the signal of a plurality of reception antennas receptions via the multiple wireless Channel Transmission, and finishes RF, RRC filtering and over-sampling respectively; In channel estimating unit, estimate the characteristic of channel of each channel then; Then, despreading and detecting unit utilize the received signal after this channel estimation results is handled despreading; Subsequently, multiple signals after will handling in BLAST detecting unit 410 carry out V-BLAST and detect to recover the transmission data on each antenna, be converted into one tunnel serial data again, the last processing of passing through the symbol de-mapper identical with Fig. 1, deinterleaver and convolution/Turbo decoder again obtains required Bit data.
Transmitter and receiver shown in Figure 2 combines chnnel coding and BLAST technology, thereby can also guarantee quality of signals to a certain extent when realizing the multidiameter delay transmission.But, this BLAST structure is to utilize the non-correlation of space channel to come the demodulation multiple signals, so receiver must use more than or equal to number of transmit antennas purpose reception antenna, only in this way could each sub data flow be made a distinction based on the characteristic of mimo channel.But for for the user terminal of downlink high speed packet data service receiving terminal, because the restriction of its volume, size and battery power consumption, the number of reception antenna often can not reach the requirement of BLAST technology, and has only a reception antenna usually.So,,, thereby under existence conditions, be not suitable for providing the high-speed packet data service of down link because it requires receiver to have many antennas and multichannel RF processing unit though the BLAST technology can improve the transmission rate of data greatly.
In the recent period except the BLAST technology, also propose other and can be applicable to the MIMO technology of 3GPP UMTSFDD system, divided antenna rate controlled (PARC:Per AntennaRate Control) for example, rate controlled rake (RC MPD:Rate Control MultipathDiversity) and two space-time emission diversity-sub-packet rates control (DSTTD-SGRC:Double Space Time Transmit Diversity-Sub-Group Rate Control) etc.But these MIMO technology need be used a plurality of reception antennas too in the processing procedure of terminal, if from the realization of terminal and become originally, also are not suitable for the high-speed transfer of down link.
Based on above analysis, though the MIMO technology can realize high speed data transfer, it is restricted its range of application to the requirement of user terminal reception antenna number.Thereby, need to seek a kind of multidiameter delay data transmission method, only there is a reception antenna still can realize high speed data transfer even make in this way in the user terminal.
In the prior art, space-time trellis codes (STTC) technology can be applied to single reception antenna, but present existing STTC has only provided the grid chart of the space-time trellis codes of maximum two transmitting antennas, 16 kinds of states, if and needs adopt more transmitting antenna to improve transmission rate or to adopt more state to improve coding gain, then the mode with this drafting trellis code figure designs space-time trellis codes, will be very complicated.Therefore the application of STTC is very limited.Other use the technology of single reception antenna, and for example space-time emission diversity or wave beam forming have all only considered how to improve diversity gain, perhaps how to improve systematic function by reducing to disturb, for improving not contribution of message transmission rate.
For this reason, be necessary to propose a kind of method that is used for the multidiameter delay transfer of data, under the situation of having only a reception antenna, still can realize high speed data transfer even guarantee user terminal.
Summary of the invention
An object of the present invention is to propose a kind of space channel coding and decoding method that is used for the multidiameter delay transmission, even use this method user terminal only to have a reception antenna still can realize the multidiameter delay transfer of data, thus the transmission rate of raising data.
According to a kind of space channel coding method of the present invention, comprise step:, import the data to be encoded of one group of serial according to predetermined traffic rate; According to predetermined communication pattern, adopt the respective coding criterion, these group data are carried out the space channel coding, the code signal with the output multidiameter delay wherein, has relevant redundant information between this each road code signal; This each road code signal is correspondingly sent via a plurality of transmitting antennas.
According to a kind of space channel coding/decoding method of the present invention, comprise step: the code signal that receives multidiameter delay via at least one reception antenna, wherein, the code signal of this multidiameter delay is encoded by space channel at a transmitting terminal after by corresponding a plurality of transmitting antennas transmissions, have relevant redundant information between this each road code signal; According to the pilot signal that receives, a plurality of wireless channels that transmit this code signal are carried out channel estimating; Utilize this channel estimation results,, this received signal is decoded according to this space channel coding.
According to a kind of space channel encoder of the present invention, comprising: a plurality of coding branch roads are used for receiving respectively the data to be encoded of one group of serial; Wherein, each coding branch road is formed of registers, and according to predetermined communication pattern, adopts the respective coding criterion, and each coding branch road carries out chnnel coding to these group data that receive; These a plurality of coding branch roads, the parallel code signal of output has relevant redundant information between this each road code signal respectively; A plurality of transmitting antennas are used for correspondingly this each road code signal being sent.
According to a kind of spatial channel decoder of the present invention, comprise: at least one reception antenna, be used to receive the code signal of multidiameter delay, wherein, the code signal of this multidiameter delay is encoded by space channel at a transmitting terminal after by corresponding a plurality of transmitting antennas transmissions, have relevant redundant information between this each road code signal; At least one channel estimating unit is used for according to the pilot signal that receives a plurality of wireless channels that transmit this code signal being carried out channel estimating; A decoder module is used to utilize this channel estimation results, according to this space channel coding, this received signal is decoded.
By with reference to below in conjunction with the content in the description of the drawings and claims, and along with more complete understanding of the invention, other purposes of the present invention and effect will become clear more and easy to understand.
The accompanying drawing summary
Describe the present invention below with reference to the drawings and specific embodiments, wherein:
Fig. 1 illustrates the structured flowchart of transmitter and receiver of the 3GPP UMTS FDD system of single antenna;
Fig. 2 is illustrated in the structured flowchart that adopts the transmitter and receiver of BLAST technology in the 3GPP UMTS FDD system;
Fig. 3 is that wherein transmitter has a plurality of transmitting antennas according to the structured flowchart of the transmitter and receiver of the employing space channel coding and decoding technology of the preferred embodiments of the present invention, and receiver only has a reception antenna;
The space channel coding structure (architecture) that in transmitter with two transmitting antennas use of Fig. 4 for proposing according to the preferred embodiments of the present invention;
The space channel coding structure that in transmitter with three transmitting antennas use of Fig. 5 for proposing according to the preferred embodiments of the present invention;
Fig. 6 is that wherein transmitter and receiver all can adopt a plurality of antennas according to the structured flowchart of the transmitter and receiver of the employing space channel coding and decoding technology of the preferred embodiments of the present invention;
Fig. 7 is that be all that single antenna construction, the present invention that adopting respectively of QPSK modulation have chnnel coding propose a kind of two send out in the system of antenna space chnnel coding structures and two kinds of BLAST structures the curve chart of the frame error rate performance that tests out; With
Fig. 8 is all single antenna construction that adopting respectively of 8PSK modulation have chnnel coding, adopts in the system of BLAST structures the curve chart of the frame error rate performance that tests out according to a kind of three antenna space chnnel coding structures of the present invention and two kinds.
In institute's drawings attached, identical label is represented similar or corresponding feature or function.
Detailed Description Of The Invention
According to space channel coding method of the present invention, chnnel coding is combined with the multidiameter delay structure, by adding partial redundance information between the multi-path parallel signal so that have spatial coherence between the multi-path parallel signal, and then help to demodulate this multi-path parallel signal at the user terminal of receiving terminal, to realize that user terminal receives large batch of high-speed data service under the condition of limited reception antenna.
Based on above consideration, the present invention proposes a kind of space channel coding method that chnnel coding and space encoding are combined.Particularly, in transmitter (for example base station), at first determine the once input bit number of coding of space channel coding according to the message transmission rate of system requirements, in a plurality of branch roads, simultaneously input bit is carried out the space channel coding respectively then according to predetermined coding rule, and a plurality of coded-bits that obtain after will encoding are by the employed modulation mapping mode of system, be converted to and the corresponding multiplex coding signal of number of transmit antennas, thereby can send to receiving terminal via a plurality of transmitting antennas.In receiving terminal (user terminal), receiver is according to known coding rule, utilizes the characteristic of channel of the multiplex (MUX) that channel estimating draws, and the signal that is received decoded, thereby the code signal of multidiameter delay is converted to one road desired data.Handle through this space channel coding method, multi-path parallel signal behind the coding not only has temporal correlation each other, also has spatial coherence, therefore, when decoding, make full use of this room and time correlation, can reduce requirement greatly user terminal reception antenna number.
Below incite somebody to action 3-5 at first in conjunction with the accompanying drawings, in 3GPP UMTS FDD system, the situation that a reception antenna is only arranged in the user terminal receiver is an example, describes space channel coding (SCC:Spatial Channel Code) method proposed by the invention in detail.
Fig. 3 illustrates the transmitter (for example base station) of employing space channel coding method proposed by the invention and the structured flowchart of receiver (for example, user terminal).As shown in Figure 3, in transmitter 500, data to be sent are at first sent into space channel coding structure 510 and are carried out the space channel coding, and its concrete structure will be described in detail in Fig. 4 and Fig. 5.User data to be sent is through the processing of space channel coding structure 510, be converted to the code signal of multidiameter delay with spatial coherence, the code signal of each parallel branch signal that experiences scrambling processing, 105 pairs of a plurality of code channels of multiplexer of ovsf code spread spectrum, the scrambler 104 of interleaving treatment, the OVSF spectrum-spreading unit 103 of interleaver 102 separately successively superposes then, pulse shaping unit 106 forms the multi-channel rf signal with the modulation that the signal of stack carries out pulse shaping and RF (radio frequency) unit 107, and via a plurality of transmission antennas transmit to wireless space.
The radiofrequency signal of multidiameter delay arrives the receiver 600 of user terminal via the transmission of wireless channel.In the present embodiment, receiver 600 has only a reception antenna.The received signal of this reception antenna is the stack via all multiple signals of a plurality of parallel spatial Channel Transmission.RF unit 208 is a baseband signal with the multi-channel rf conversion of signals that antenna receives, and sends into RRC filter and over-sampling unit 206, so that analog signal conversion is discrete (discrete) signal.Resulting discrete signal is delivered to space channel decode structures 610 after the processing of the despreading processing of passing through despreading and detecting unit 204 and deinterleaver 202.And in channel estimating unit 220, according to the pilot signal that receives, the characteristic of channel of a plurality of parallel spatial channels is estimated.Then, space channel decode structures 610 is utilized the characteristic of channel of the estimated multiplex (MUX) that goes out of channel estimating unit 220, space channel coding structure 510 according to transmitter 500 employings, superposed signal after the deinterleaving is carried out the soft decoding of corresponding Viterbi, thereby the multi-path parallel signal that is superimposed is solved one by one, and in decoding, its multi-path parallel signal is converted to one tunnel serial data, i.e. user requested data.The process that this space channel decode structures 610 utilizes the estimated channel characteristic, carry out the soft decoding of Viterbi will describe in detail hereinafter.
In Fig. 3, space channel coding structure 510 is crucial processing units, and it is undertaking the dual role of chnnel coding and space encoding.Fig. 4 and Fig. 5 illustrate two kinds of concrete structures of space channel coding structure 510 respectively.Fig. 4 illustrate when transmitter 500 be two transmitting antennas, and receiver 600 has only under the situation of a reception antenna, the structure of space channel coding.Fig. 5 illustrate when transmitter 500 be three transmitting antennas, and receiver 600 is under the situation of a reception antenna, the structure of space channel coding.As shown in Figure 4 and Figure 5, in these two embodiment of the present invention, more compact in order to make structure, the space channel coding structure also comprises the function of sign map unit 103.Like this, be input to the data bit of space channel encoder, after treatment, will obtain the symbol of multichannel through phase/amplitude (phase place or amplitude) modulation.Certainly, this sign map unit also can be placed on the outside execution of space channel coding structure.
Below, at first introducing transmitter 500 with reference to Fig. 4 has two transmitting antennas, and receiver 600 has only under the situation of a reception antenna, the structure of space channel coding.
As shown in Figure 4, the space channel coding structure comprises that 4 parallel shift register branch roads are (among the figure, each shift register props up one group of register D of route and represents), with two QPSK (quarternary phase-shift keying (QPSK)) map unit, wherein each shift register branch road all is used for finishing a chnnel coding, thereby, also can be described as the chnnel coding branch road.
In the present embodiment, suppose, the message transmission rate of the system requirements transmitter with two transmitting antennas as shown in Figure 3 is 2b/s/Hz (bit number of b/s/Hz representation unit frequency spectrum, transmission per unit of time), and adopt the QPSK modulation system, then according to thought of the present invention, according to message transmission rate (2b/s/Hz), determine the space channel coding structure once encode the input bit number be 2.Simultaneously, because each transmitting antenna adopts the QPSK modulation system of the corresponding symbol of per two bits, and transmitter has two transmitting antennas, then being equivalent to coding output bit is 4, therefore, the space channel coding structure has 4 chnnel coding branch roads, and the coded-bit of per two branch roads output is with generating a QPSK symbol.Like this, the encoding rate of space channel coding structure is 1/2.
After having determined the chnnel coding number of branches, in order to improve the antijamming capability of signal, can be with in each chnnel coding branch road, the number of registers that is used to carry out chnnel coding is set to 9, and promptly the encoder of each branch road has 9 register D among Fig. 4.Because once coding needs to handle 2 input bit information, so, have only 7 displaced condition after maintenance encoding process last time among 9 register D, that is to say that each chnnel coding branch road always has 2
7=128 states.Here the state that it may be noted that the chnnel coding branch road can be set according to the requirement of the transmission quality of real system, if more register then can be selected to use to having relatively high expectations of signal quality by system.
According to above setting, the message transmission rate that is used under two transmitting antennas, the reception antenna situation that has just constituted as shown in Figure 4 is 2b/s/Hz, has a space channel coding structure of 128 states.
As seen from Figure 4, the data bit b of dual serial
1And b
2, displacement simultaneously enters 4 registers in the parallel coding branch road.Each handle branch road according to pre-designed coding rule (for example, the generated code G0 of first chnnel coding branch road is that the generated code G1 of 101110011, the second chnnel coding branch roads is 010011100, wherein, the corresponding register of each of generated code.) carry out encoding process.The specific coding process is to be that the bit status of storing in 1 the register takes out and finish mould two summations (modulus 2 adds) with the corresponding position of generated code in each branch road, thus the bit information after obtaining encoding.Then, the coded-bit of first, second branch road combined carry out the QPSK mapping, thereby obtain the symbol c that on first transmitting antenna, to send
1In like manner, the coded-bit of the 3rd, the 4th branch road is carried out the QPSK mapping, just obtain the symbol c that on second transmitting antenna, sends
2Like this, just one tunnel serial data coding can be mapped as the parallel signal of two-way according to structure shown in Figure 4, and this two-way parallel signal has the correlation in space each other through chnnel coding.
In space channel coding structure shown in Figure 4,, need to select suitable coding rule, so that the minimum bit-error rate of signal in order to improve the antijamming capability of signal.For this reason, method that space channel coding is carried out system design is proposed here.Because a basis of coded system design is to construct coding generator matrix G, thereby, below with structural extended shown in Figure 4 to ordinary circumstance, the Mathematical Modeling of encoding with the structure space channel.
At first, the data information bits of supposing to be input to space channel coding (SCC) structure is B=[b
1, b
2... .., b
K], wherein, K represents the bit number that this SCC once encodes.According to thought of the present invention, K is by the message transmission rate decision of system requirements, and for example message transmission rate is 2b/s/Hz, then K=2 in structure shown in Figure 4.Like this, the symbol c that draws through space channel coding corresponding to n transmitting antenna (wherein, n=1,2...N, N represent the number of transmitting antenna)
nCan be expressed from the next:
D=[B M wherein], M=[b
K+1, b
K+2... .., b
K+S] information bit of current state, wherein the register number that be used for preservation state information of S for requiring according to systematic function to determine, for example S=7 in structure shown in Figure 4, that is: D=[b in the expression register
1, b
2... .., b
Kb
K+1, b
K+2... .., b
K+S].G is the coding generator matrix, wherein, the superscript T representing matrix transposition of coding generator matrix G, the Qn-Q+1 in the Qn-Q+1:Qn representing matrix in the subscript is capable to be used to calculate c to the capable array element of Qn
nQ represents the employed modulation system of system in the formula (1), and for example system adopts the QPSK modulation, and then Q=2 adopts 16QAM (16 phase quadrature amplitude modulation), then Q=4.Be not difficult to find the symbol c of each transmitting antenna by formula
nPairing one group of chnnel coding number of branches is determined by the pairing Q value of modulation system.For example, in the structure of employing QPSK shown in Figure 4, Q=2 then is used to generate c
1Generation be encoded to the 1st row of coding generator matrix and the 2nd capable, just two chnnel coding branch roads of first, second shown in Fig. 4.The generated code of the corresponding chnnel coding branch road of each row of G, that is: a register D in each array element corresponding displaced register of coding generator matrix G is 1 as if this array element, then the bit among this register D will be removed and carry out mould two computings.The value that will obtain after will encoding with Φ () expression in formula (1) is mapped as the modulation mapping process of phase symbol.For example in structure shown in Figure 4, system adopts the QPSK mapping, and then Φ () is expressed as Φ (x)=exp (π jx/2), x=1,2....4.
From the above mentioned, the space channel cataloged procedure can be by formula (1) expression, and this has just constructed the Mathematical Modeling of space channel coding.Wherein, the modulation system that message transmission rate, number of transmit antennas and system adopted according to system's reality, the line number and the columns of coding generator matrix have been determined, ensuing problem is how to determine to encode the array element of generator matrix G, promptly seeks suitable coding generator matrix G and obtains best coding effect.
Be not more than at the product of the number of number of transmit antennas and reception antenna under 3 the situation, can adopt the foundation of following criterion: in the grid chart that is generated according to coding generator matrix G as search coding generator matrix G, each deciphers the matrix of differences B that constitutes between the output symbol of correspondence in path, makes the minimum value maximization of order/long-pending (order (rank)/long-pending (product) expression: sum of ranks is long-pending) of matrix A=B*B ' (B ' represent the conjugate transpose of this matrix of differences B).In the present embodiment, because transmitting antenna N=2, reception antenna number M=1, thereby can be with the search criteria of this criterion as coding generator matrix G.In search procedure, the pairing grid chart of each coding generator matrix G is judged, thereby searched a forced coding generator matrix G as shown in Equation (2) according to the order/long-pending minimum value maximization criterion of this matrix A
Work as N=2, M=1,
The specific implementation structure of this coding generator matrix G is structure shown in Figure 4.
Coding generator matrix G as shown in Equation (2) is updated in the formula (1), can obtains parallel encoding signal, just the output signal of structure shown in Figure 4 corresponding to two transmitting antennas.According to the structure of transmitter 500 shown in Figure 3, the parallel code signal of this two-way respectively through interweaving, spread spectrum, scrambling, pulse shaping and modulation, give the user terminal receiver via two transmission antennas transmit.In receiver, space channel decode structures 610 as shown in Figure 3, the characteristic of channel that estimates according to channel estimating unit 220, the grid chart that is generated according to as shown in Equation (2) coding generator matrix G carries out the soft decoding of Viterbi to received signal.
The principle of the soft decoding of Viterbi is: the space channel decode structures is according to coding generator matrix G, the every paths of search in the grid chart of determining by the coding structure status number, and find out optimal path with received signal error minimum, then the pairing input data bit of optimal path is the desired data that decodes.In an embodiment of the present invention, because receiver 600 has only a reception antenna, received signal is the parallel stack that transmits of two-way, for example r=h
1* c
1+ h
2* c
2+ n, wherein h is the characteristic of channel, n is a Gaussian noise.Thereby in the route searching process, space channel decode structures 610 is with the characteristic of channel h that estimates
1And h
2Be multiplied by code signal c ' on the searching route as weight
1And c '
2, weighted sum again, thus signal to be judged obtained, i.e. r '=h
1* c '
1+ h
2* c '
2Space channel decode structures 610 waits to judge that with this signal r ' and received signal r compare then, generates a metric.This metric is represented the gap size between r ' and the actual reception signal r.Veterbi decoding only keeps the path of metric minimum in search procedure, final search obtains and the optimal path of actual reception signal difference apart from minimum, thereby solves required user data.
More than have two transmitting antennas with transmitter, the situation that receiver has a reception antenna is that example is described space channel coding method and structure proposed by the invention in detail.Method proposed by the invention can also be applied to transmitter and have three transmitting antennas (N=3), and receiver only has the situation (M=1) of a reception antenna.In this case, it is 3b/s/Hz that supposing the system requires the transmission rate of data, K=3 then, promptly once the bit number of coding input is 3, if system adopts 8PSK (eight phase phase shift keyings) modulation system simultaneously, then Q=3, and 8PSK modulation mode is expressed as Φ (x)=exp (π jx/8), x=1,2....8.Thus, according to the requirement of formula (1), it also is 3 that the chnnel coding of each transmitting antenna correspondence is propped up way.If, adopt this moment the chnnel coding branch road of 128 states (S=7) just can satisfy the requirement of systematic function, N=3 so, M=1, the coding generator matrix of S=7 just are that 9 row, 10 are listed as.Still can adopt this moment and make the order/long-pending minimum value maximization criterion of this matrix A seek suitable coding generator matrix G.Through the search, the N=3 that draws, M=1, the forced coding generator matrix G of S=7 as shown in Equation (3):
Work as N=3, during M=1,
Import data bit b according to the coding generator matrix G shown in the formula (3) to continuous three
1, b
2And b
3Carry out encoding process.So according in the formula (1) to being used to generate c
nThe line number of coding generator matrix be the requirement of Qn-Q+1:Qn, output symbol c then
1Mapping symbols for the coded-bit that first three rows generated among the coding generator matrix G.
Fig. 5 shows and is used for three transmitting antennas, the space channel coding structure of the 3b/s/Hz of a reception antenna, 128 states according to formula (3) structure.Its basic principle is identical with Fig. 4, difference is once to encode and can handles 3 input bits, has 9 parallel chnnel coding branch roads, and the coded-bit of per three coding branch roads output is combined, carry out the mapping of 8PSK, thereby obtain the code signal of three-channel parallel.Utilize space channel coding structure shown in Figure 5, should have accordingly in the transmitter three the tunnel interweave, spread spectrum, scrambling, pulse shaping and RF modulating unit, three road code signals are converted to the radiofrequency signal that can go out from the transmission antennas transmit of correspondence.
At receiving terminal, because the same receiver that adopts single antenna, thereby the structure of receiver and Fig. 3 are identical.Only, received signal comprises the signal via three Channel Transmission, i.e. r=h
1* c
1+ h
2* c
2+ h
3* c
3+ n, thereby the channel estimating unit of receiver need be estimated the characteristic of channel h of 3 channels among Fig. 3
1, h
2And h
3When the space channel decode structures was carried out the soft decoding of Viterbi, signal to be judged was the weighted sum of three code signals, i.e. r '=h
1* c '
1+ h
2* c '
2+ h
3* c '
3R ' and received signal r are compared, generate a metric, and utilize this metric, in grid chart, search out and the optimal path of actual reception signal difference, thereby solve required user data apart from minimum.
More than, in conjunction with the accompanying drawings 4 and accompanying drawing 5 described at transmitter 500 and had two and three transmitting antennas, and receiver 600 has the situation of a reception antenna.Certainly, method proposed by the invention is not confined to both of these case, can also be applied under the situation with more transmitting antenna, can also be applied in receiver simultaneously and have under the situation of a plurality of reception antennas.
Fig. 6 shows a kind of according to the transmitter architecture with a plurality of transmitting antennas of the present invention with have the structure of the receiver of a plurality of reception antennas.Compare with Fig. 3, among Fig. 6, because receiver 700 has a plurality of reception antennas, correspondingly receiver comprises a plurality of receptions processing branch roads, the component units of each reception processing branch road is identical with the reception processing branch road of single reception antenna shown in Figure 3, includes RF unit 208, RRC filtering and over-sampling unit 206, despreading and detecting unit 204, deinterleaver 202 and channel estimating unit 220.Receive to handle the received signal that branch road is handled through each, and the characteristic of channel that estimates of each branch road channel estimating unit, together send in the space channel decode structures 710, decode.Different with single reception antenna situation, space channel decode structures 710 is when carrying out the soft decoding of Viterbi, the multipath reception signal can be weighted summation and obtain best received signal, utilize the characteristic of channel that obtains by channel estimating then, decode to received signal, finally obtain required user data.This shows, in receiver, use the receive diversity gain of many antennas reception can raising signals, thereby reduce the error rate of signal.Therefore, when having a plurality of reception antenna in the receiver, can increase the encoding rate of space channel coding, with the transmission rate of further raising data.
As shown in Figure 6, method proposed by the invention both can be applied in the situation of single reception antenna, also can be applicable to the situation of multiple receive antenna.Here it may be noted that long-pending greater than three time when the number of the number of transmitting antenna and reception antenna, the criterion that is used to seek the forced coding generator matrix recited above will change.Studies show that, when diversity branch more than three the time, the multichannel multidiameter fading channel will change additive white Gaussian noise (AWGN) channel into.Therefore, at this moment, the coding criterion of space channel coding will become employing and traditional identical criterion of TCM (Trellis-coded modulation) criterion, for example: guarantee the minimum euclidean distance maximization.Even under this situation with more antenna, can directly select the TCM coding as the space channel coding structure, thereby, be applied under the situation of many antennas with traditional TCM that only is used for single antenna.
According to the introduction of above 3-6 in conjunction with the accompanying drawings to the embodiment of the invention, being not difficult to find in the application system of reality can be according to the requirement of message transmission rate, and actual transmitting antenna and reception antenna number require design space chnnel coding structure.Table 1 has been listed under different antennae configuration and modulation system, data rate, space encoding rate and order of diversity that the space channel coding can reach.The space channel coding structure that indicates SCC-I and SCC-II in table 1 is respectively the structure shown in Fig. 4 and Fig. 5 in the embodiment of the invention.Space encoding rate in the table 1 is the encoding rate of Spatial Dimension.For example, four transmitting antennas, two reception antennas and use the situation of 16QAM (quadrature amplitude modulation) mapping in the table 1 are abbreviated as 4Tx-2Rx 16QAM situation.It is 4b/s/Hz that supposing the system requires data rate, and then coded data bit of space channel encoder is 4 bits, and through obtaining the coded-bit of 16 bits behind the coding of each chnnel coding branch road, then the space encoding rate is 1/4.After this 16 coded-bit is handled through the mapping of 16QAM then, by 4 symbols of space channel coding structure output corresponding to 4 transmitting antennas.This moment is because reception antenna is 2, thereby order of diversity (diversity order) is 8.By in the table as can be seen, in real system, according to system's transmitting antenna, message transmission rate, and the requirement of modulation system, choose reasonable space channel coding structure can be realized the transfer of data of higher rate under the terminal condition condition of limited.
Because this space channel coding method proposed by the invention is chnnel coding to be combined with space encoding realize the multidiameter delay transmission, thereby compare with single antenna transmitting-receiving structure and existing BLAST technology and to have better system performance, this point has obtained confirmation in emulation experiment.
Table 1
Space channel coded data transfer rate, space encoding rate and order of diversity under different emissions, the reception antenna situation
| (N，M) | The space encoding rate | Modulation system | Spectrum efficiency (bit/s/Hz) | Order of diversity |
| (2，1) (SCC-I) | 1/2 | QPSK | 2 | 2 |
| (3，1)(SCC-II) | 1/3 | 8PSK | 3 | 3 |
| (4，1) | 1/4 | 16QAM | 4 | 4 |
| (2，2) | 1/2 | QPSK | 2 | 4 |
| (3，2) | 1/3 | 8PSK | 3 | 6 |
| (4，2) | 1/4 | 16QAM | 4 | 8 |
Table 2 shows the simulation parameter of different structure under 8 kinds of different dual-mode antenna numbers.It is four groups that these eight kinds of structures are divided into, and is respectively single dual-mode antenna (SISO:Single Input SingleOutput) structure, space channel coding structure (SCC), has the BLAST structure (BLAST) of chnnel coding and BLAST (nBLAST) structure of the coding of not taking a message.Comprise that again two kinds of concrete structures identify with I and II respectively in each group.The structure that is all I in every group is the QPSK modulation, and the structure that is all II is the 8PSK modulation.SISO-I and SISO-II structure are not carried out interleaving treatment in the table 2, and adopt (2,1,9) and (3,1,9) two kinds of coded systems to carry out chnnel coding respectively, encoding rate be respectively 1/2 and 1/3, two kind of encoder 256 kinds of states are all arranged.SCC-I that lists in the table 2 and SCC-II are that the transmitter that the present invention provides adopts two and three transmitting antennas respectively, and receiver is the parameter of two embodiment of single antenna reception.In the BLAST group, the chnnel coding structure of BLAST-I and BLAST-II is identical with SISO-I and SISO-II.
Emulation experiment to above these 8 kinds of structures is to be based upon to suppose that transmission channel is the quasistatic flat fading channel, and the bit number of every frame data is and carries out under 130 the prerequisite during transfer of data, and other parameters of emulation experiment are all according to 3GPP UMTS FDD standard setting.
Adopt above 8 kinds of structures to carry out emulation experiment, the signal to noise ratio of difference test signal and the performance index between the frame error rate, its simulation result is as shown in Figure 7 and Figure 8.
Table 2 simulation parameter
| SISO-I | SISO-II | SCC-I | SCC-II | BLAST- I | BLAST- II | nBALST- I | nBALST- II | |||||
| Number of transmit antennas * reception antenna number | 1*1 | 2*1 | 3*1 | 2*2 | 3*3 | 2*2 | 3*3 | |||||
| Chnnel coding | (2，1，9) | (3，1，9) | SCC-I | SCC-II | (2，1，9) | (3，1，9) | None | None | ||||
| The modulation mapping | QPSK | 8PSk | QPSK | 8PSK | QPSK | 8PSK | QPSK | 8PSK | ||||
| Transmission channel | The quasistatic flat fading channel | |||||||||||
| Every frame bit number | 130 | |||||||||||
| System data transfer rate (b/s/Hz) | 1 | 1 | 2 | 3 | 2 | 3 | 4 | 9 | ||||
Fig. 7 shows the curve chart of the frame error rate of received signal between SISO-I, SCC-I, BLAST-I and four kinds of structures of nBLAST-I with the signal to noise ratio variation.Fig. 8 shows the curve chart that the received signal frame error rate changes with signal to noise ratio between SISO-II, SCC-II, BLAST-II and four kinds of structures of nBLAST-II.In Fig. 7 and Fig. 8, abscissa is the signal to noise ratio snr of received signal, and ordinate is frame error rate FER.Referring to Fig. 7, be not difficult to find out, under the identical situation of FER, for example work as FER=10
-1The time, in four kinds of system schemas, adopting the SCC-I scheme, the signal to noise ratio of the patient received signal of institute of system is minimum, and than the low 4dB of the scheme that adopts SISO-I, hangs down 3dB than BLAST-I.Referring to Fig. 8, same, under the identical situation of FER, for example work as FER=10
-1The time, in four kinds of system schemas, adopting the SCC-II scheme, the signal to noise ratio of the patient received signal of institute of system still is minimum, and than the low 1dB of the scheme that adopts SISO-II, hangs down 3dB than BLAST-II.This shows that SCC has good systematic function.
In emulation experiment, also measured the message transmission rate of system, the system data transmission rate is the performance of system spectral efficiency, and its unit is b/s/Hz, lists in measurement result last column in table 2.By the message transmission rate shown in the table 2 as seen, the message transmission rate of space channel encoding scheme is far above single antenna construction.Though the BLAST structure has the highest message transmission rate, apparent by Fig. 7 and Fig. 8, the frame error rate of BLAST structure is the poorest, but also must use multiple receive antenna, thereby SCC compares with BLAST, is more suitable for providing the high-speed data service of down link.
Beneficial effect
By above in conjunction with the accompanying drawings to the detailed description of the embodiment of the invention, as can be seen, chnnel coding and space encoding are done as a whole space channel coding method of encoding, under can the reception antenna number condition of limited in receiver, even when in receiver, having only a reception antenna, the realization multidiameter delay transmits, thereby improves the message transmission rate of system, thereby is highly suitable for the high-speed packet data service of down link.
And space channel coding proposed by the invention is compared with existing STTC, can have more transmitting antenna, and more chnnel coding state (for example, 128 states) is with further raising diversity gain and coding gain; The method for designing of the space channel coding that the present invention simultaneously proposes can also be determined the space channel coding, thereby be convenient to use practically neatly according to traffic rate, communication quality, modulation system and the number of transmit antennas of transmitter employing.
In addition, the invention allows for long-pending greater than 3 time when transmitting antenna and reception antenna number, the criterion of space channel coding generator matrix is the minimum euclidean distance maximization, and is fit to adopt the TCM coding method, for system extension from now on provides feasible method.
It will be appreciated by those skilled in the art that and on the basis that does not break away from content of the present invention, to make various improvement disclosed space channel coding method of the invention described above and device.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (38)
1, a kind of space channel coding method comprises step:
(a), import the data to be encoded of one group of serial according to predetermined traffic rate;
(b) according to predetermined communication pattern, adopt the respective coding criterion, these group data are carried out chnnel coding, the code signal with the output multidiameter delay wherein, has relevant redundant information between this each road code signal;
(c) this each road code signal is correspondingly sent via a plurality of transmitting antennas.
2, space channel coding method as claimed in claim 1, wherein, step (b) comprising:
(b1), be identified for the corresponding branch road group of chnnel coding according to the number of these a plurality of transmitting antennas;
(b2) according to predetermined modulating mode, determine the branch road that is used for chnnel coding that each branch road group is included;
(b3), these group data that are input in these a plurality of branch roads are encoded according to the respective coding criterion.
3, space channel coding method as claimed in claim 2, wherein, step (b2) also comprises:
According to the requirement of communication quality, determine a plurality of registers that are used for chnnel coding in described branch road;
Wherein, in this step (b3),, these group data that are input to these a plurality of registers in the described branch road are encoded according to the respective coding criterion.
4, space channel coding method as claimed in claim 3, wherein, step (b3) comprising:
According to the respective coding criterion, select the dateout of the corresponding a plurality of registers in these a plurality of branch roads;
According to this dateout, generate the coded data of these a plurality of branch roads.
5, space channel coding method as claimed in claim 4, step (b3) also comprises:
According to described modulating mode, the coded data of a plurality of branch roads of this generation is carried out sign map, to export the code signal of described multidiameter delay.
6, space channel coding method as claimed in claim 5, wherein, described modulating mode is any one among BPSK (two-phase PSK), QPSK (quarternary phase-shift keying (QPSK)), 8PSK (eight phase phase shift keyings) and the QAM (quadrature amplitude modulation) at least.
7, space channel coding method as claimed in claim 3, wherein, if the product of the number of the number of described transmitting antenna and reception antenna is not more than 3, this reception antenna is to be used to receive the code signal that described transmitting antenna sends in a receiving terminal, then described coding criterion adopts: for the coding generator matrix that is made of a plurality of registers in described a plurality of branch roads and each branch road, in according to the coding grid chart that generator matrix generated, each deciphers the matrix of differences that constitutes between the output symbol of correspondence in path, makes this matrix of differences and its associate matrix multiply each other resulting rank of matrix and long-pending minimum value maximization.
8, space channel coding method as claimed in claim 7, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described coding criterion adopts: make the minimum euclidean distance in the grid chart when decoding maximize.
9, space channel coding method as claimed in claim 7, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described coding criterion adopts traditional TCM (Trellis-coded modulation) to encode.
10, space channel coding method as claimed in claim 1, wherein step (c) comprising:
The code signal that uses different spreading code spread spectrums is carried out multiplexing, with via this multiplexing code signal of same antenna transmission;
The spread spectrum coded signal that each road is multiplexing correspondingly sends via described a plurality of transmitting antennas.
11, a kind of space channel coding/decoding method comprises step:
(a) receive the code signal of multidiameter delay via at least one reception antenna, wherein, the code signal of this multidiameter delay is encoded by space channel at a transmitting terminal after by corresponding a plurality of transmitting antennas transmissions, have relevant redundant information between this each road code signal;
(b) according to the pilot signal that receives, a plurality of wireless channels that transmit this code signal are carried out channel estimating;
(c) utilize this channel estimation results,, this received signal is decoded according to this space channel coding.
12, space channel coding/decoding method as claimed in claim 11, wherein, if in step (a), receive this code signal via a plurality of reception antennas, then in step (b), according to the pilot signal that receives, respectively a plurality of wireless channels that transmit this code signal are carried out channel estimating, and step (c) comprising:
Utilize corresponding channel estimation results, the code signal of a plurality of receptions is weighted;
According to this space channel coding, the signal after the weighting is decoded.
13,, wherein, in step (c), use the Viterbi soft decoding method that this received signal is decoded as claim 11 or 12 described space channel coding/decoding methods.
14, space channel coding/decoding method as claimed in claim 13, wherein, the communication pattern that described space channel coding adopts based on this transmitting terminal.
15, space channel coding/decoding method as claimed in claim 14, wherein, described communication pattern comprises: traffic rate, communication quality, modulating mode and number of transmit antennas.
16, space channel coding/decoding method as claimed in claim 15, wherein, if the product of the number of the number of described transmitting antenna and reception antenna is not more than 3, the coding criterion that then described space channel coding adopts is: in according to the coding grid chart that generator matrix generated, each deciphers the matrix of differences that constitutes between the output symbol of correspondence in path, makes this matrix of differences and its associate matrix multiply each other resulting rank of matrix and long-pending minimum value maximization.
17, space channel coding/decoding method as claimed in claim 16, wherein, if the product of the number of the number of described transmitting antenna and described reception antenna is greater than 3, the coding criterion that then described space channel coding adopts is: make that the minimum euclidean distance in the grid chart maximizes when carrying out the soft decoding of Viterbi.
18, space channel coding/decoding method as claimed in claim 16, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described space channel coding is that TCM (Trellis-coded modulation) encodes.
19, a kind of space channel encoder comprises:
A plurality of coding branch roads are used for receiving respectively the data to be encoded of one group of serial;
Wherein, each coding branch road is formed of registers, and according to predetermined communication pattern, adopts the respective coding criterion, and each coding branch road carries out chnnel coding to these group data that receive;
These a plurality of coding branch roads, the parallel code signal of output correspondingly to send via a plurality of transmitting antennas, has relevant redundant information between this each road code signal respectively.
20, space channel encoder as claimed in claim 19, wherein:, determine described coding branch road according to the number and the predetermined modulating mode of these a plurality of transmitting antennas.
21, space channel encoder as claimed in claim 20, wherein, the number of the register that each coding branch road comprises is based on the requirement of communication quality; According to the respective coding criterion, the dateout of the relevant register by this in each coding branch road generates described coded data.
22, space channel encoder as claimed in claim 21, wherein, described modulating mode is any one among BPSK (two-phase PSK), QPSK (quarternary phase-shift keying (QPSK)), 8PSK (eight phase phase shift keyings) and the QAM (quadrature amplitude modulation) at least.
23, space channel encoder as claimed in claim 19, wherein, if the product of the number of the number of described transmitting antenna and reception antenna is not more than 3, this reception antenna is to be used to receive the code signal that described transmitting antenna sends in a receiving terminal, then described coding criterion adopts: for the coding generator matrix that is made of a plurality of registers in described a plurality of coding branch roads and each the coding branch road, in according to the coding grid chart that generator matrix generated, each deciphers the matrix of differences that constitutes between the output symbol of correspondence in path, makes this matrix of differences and its associate matrix multiply each other resulting rank of matrix and long-pending minimum value maximization.
24, space channel encoder as claimed in claim 19, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described coding criterion adopts: make the minimum euclidean distance in the grid chart when decoding maximize.
25, space channel encoder as claimed in claim 19, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described coding criterion adopts traditional TCM (Trellis-coded modulation) to encode.
26, space channel encoder as claimed in claim 19 also comprises:
A plurality of Multiplexing Units, each Multiplexing Unit wherein, it is multiplexing to be used for using the code signal of different spreading code spread spectrums to carry out, with via this multiplexing code signal of same antenna transmission;
Wherein, described a plurality of transmitting antennas, the multiplexing spread spectrum coded signal of Jiang Gelu correspondingly sends.
27, a kind of spatial channel decoder comprises:
A decoder module is used to utilize channel estimation results, according to the space channel coding of received signal, this received signal is decoded; Wherein, this received signal is the code signal via the multidiameter delay of at least one reception antenna reception, the code signal of this multidiameter delay is encoded by space channel at a transmitting terminal after by corresponding a plurality of transmitting antennas transmissions, have relevant redundant information between this each road code signal; This channel estimation results is at least one channel estimating unit, according to the pilot signal that receives, a plurality of wireless channels that transmit this code signal is carried out channel estimating obtains.
28, spatial channel decoder as claimed in claim 27 also comprises:
A weighting block is used to utilize a plurality of channel estimating unit according to the resulting corresponding channel estimation results of pilot signal that a plurality of reception antennas receive, and a plurality of received signals are weighted respectively;
Wherein, this decoder module according to this space channel coding, carries out the soft decoding of Viterbi to the signal after the weighting.
29, spatial channel decoder as claimed in claim 28, wherein, the communication pattern that described space channel coding adopts based on this transmitting terminal, this communication pattern comprises: traffic rate, communication quality, modulating mode and number of transmit antennas.
30, spatial channel decoder as claimed in claim 29, wherein, if the product of the number of the number of described transmitting antenna and reception antenna is not more than 3, the coding criterion that then described space channel coding adopts is: in according to the coding grid chart that generator matrix generated, each deciphers the matrix of differences that constitutes between the output symbol of correspondence in path, makes this matrix of differences and its associate matrix multiply each other resulting rank of matrix or long-pending minimum value maximization.
31, spatial channel decoder as claimed in claim 30, wherein, if the product of the number of the number of described transmitting antenna and described reception antenna is greater than 3, the coding criterion that then described space channel coding adopts is: make that the minimum euclidean distance in the grid chart maximizes when carrying out the soft decoding of Viterbi.
32, spatial channel decoder as claimed in claim 30, wherein, if the product of the number of described transmitting antenna and the number of described reception antenna is greater than 3, then described space channel coding is that TCM (Trellis-coded modulation) encodes.
33, a kind of Radio Network System comprises:
A space channel encoder is used for serial data to be sent is carried out the space channel coding, and the code signal with the output multidiameter delay has relevant redundant information between this each road code signal;
A plurality of transmitting antennas are used for correspondingly this each road code signal being sent.
34, Radio Network System as claimed in claim 33, wherein, this space channel encoder comprises:
A plurality of coding branch roads are used for receiving respectively the data to be encoded of one group of serial;
Wherein, each coding branch road is formed of registers, and according to predetermined communication pattern, adopts the respective coding criterion, and each coding branch road carries out chnnel coding to these group data that receive;
These a plurality of coding branch roads, the parallel code signal of output correspondingly to send via described a plurality of transmitting antennas, has relevant redundant information between this each road code signal respectively.
35, Radio Network System as claimed in claim 34, wherein:
Described coding branch road is decided with predetermined modulating mode based on the number of these a plurality of transmitting antennas, the number of each register of comprising of coding branch road is decided based on the requirement of communication quality, according to the respective coding criterion, the dateout of the relevant register by this in each coding branch road generates described coded data.
36, a kind of wireless terminal comprises:
At least one reception antenna, be used to receive the code signal of multidiameter delay, wherein, the code signal of this multidiameter delay is encoded by space channel at a transmitting terminal after by corresponding a plurality of transmitting antennas transmissions, have relevant redundant information between this each road code signal;
At least one channel estimating unit is used for according to the pilot signal that receives a plurality of wireless channels that transmit this code signal being carried out channel estimating;
A spatial channel decoder is used to utilize this channel estimation results, according to this space channel coding, this received signal is decoded.
37, wireless terminal as claimed in claim 36 also comprises:
A weighting block is used to utilize a plurality of channel estimating unit according to the resulting corresponding channel estimation results of pilot signal that a plurality of reception antennas receive, and a plurality of received signals are weighted respectively;
Wherein, this spatial channel decoder according to this space channel coding, is carried out the soft decoding of Viterbi to the signal after the weighting.
38, wireless terminal as claimed in claim 37, wherein, the communication pattern that described space channel coding adopts based on this transmitting terminal, this communication pattern comprises: traffic rate, communication quality, modulating mode and number of transmit antennas.
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| CNA2004100565520A CN1735079A (en) | 2004-08-09 | 2004-08-09 | Space channel coding and decoding method and device for realizing multipath parallel transmission |
| TW093124196A TW200607273A (en) | 2004-08-09 | 2004-08-11 | Method and apparatus for spatial encoding/decoding in parallel transmission |
| PCT/IB2005/052577 WO2006016320A1 (en) | 2004-08-09 | 2005-08-02 | Method and apparatus for spatial channel coding/decoding in multi-channel parallel transmission |
| CNA2005800268480A CN1993918A (en) | 2004-08-09 | 2005-08-02 | Method and apparatus for spatial channel coding/decoding in multi-channel parallel transmission |
| EP05773101A EP1779573A1 (en) | 2004-08-09 | 2005-08-02 | Method and apparatus for spatial channel coding/decoding in multi-channel parallel transmission |
| KR1020077002936A KR20070050436A (en) | 2004-08-09 | 2005-08-02 | Method and apparatus for spatial channel coding/decoding in multi-channel parallel transmission |
| JP2007525409A JP2008509621A (en) | 2004-08-09 | 2005-08-02 | Method and apparatus for spatial channel coding / decoding in multi-channel parallel transmission |
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| KR100899735B1 (en) * | 2002-07-03 | 2009-05-27 | 삼성전자주식회사 | Apparatus for adaptive transmit antenna diversity in mobile communication system and method thereof |
-
2004
- 2004-08-09 CN CNA2004100565520A patent/CN1735079A/en active Pending
- 2004-08-11 TW TW093124196A patent/TW200607273A/en unknown
-
2005
- 2005-08-02 KR KR1020077002936A patent/KR20070050436A/en not_active Application Discontinuation
- 2005-08-02 JP JP2007525409A patent/JP2008509621A/en active Pending
- 2005-08-02 WO PCT/IB2005/052577 patent/WO2006016320A1/en not_active Application Discontinuation
- 2005-08-02 EP EP05773101A patent/EP1779573A1/en not_active Withdrawn
- 2005-08-02 CN CNA2005800268480A patent/CN1993918A/en active Pending
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| WO2007104231A1 (en) * | 2006-03-10 | 2007-09-20 | Huawei Technologies Co., Ltd. | A multimedia broadcast/multicast service communication method, network and apparatus |
| CN101809918A (en) * | 2007-09-27 | 2010-08-18 | 爱立信电话股份有限公司 | multiplicative network coding |
| CN101809918B (en) * | 2007-09-27 | 2014-03-05 | 爱立信电话股份有限公司 | Multiplicative network coding |
| US8792539B2 (en) | 2007-09-27 | 2014-07-29 | Telefonaktiebolaget L.M. Ericsson (Publ) | Multiplicative network coding |
| CN102916736A (en) * | 2012-10-12 | 2013-02-06 | 广州海格通信集团股份有限公司 | Radio monitoring method and device of wireless communication system |
| CN102916736B (en) * | 2012-10-12 | 2016-01-20 | 广州海格通信集团股份有限公司 | The radio monitoring method and apparatus of wireless communication system |
| CN108306707A (en) * | 2017-01-12 | 2018-07-20 | 中兴通讯股份有限公司 | A kind of method, apparatus and communication system of multiple access access |
| CN108306707B (en) * | 2017-01-12 | 2024-02-20 | 中兴通讯股份有限公司 | Method, device and communication system for multiple access |
| CN114696956A (en) * | 2017-01-13 | 2022-07-01 | 杜比实验室特许公司 | System and method for generating data replicas for transmission over multiple communication channels |
| CN114696956B (en) * | 2017-01-13 | 2024-01-16 | 杜比实验室特许公司 | System and method for generating copies of data for transmission over multiple communication channels |
| US11956075B2 (en) | 2017-09-25 | 2024-04-09 | Dolby Laboratories Licensing Corporation | Systems and methods to optimize the load of multipath data transportation |
| WO2020034942A1 (en) * | 2018-08-13 | 2020-02-20 | 中兴通讯股份有限公司 | Multiple access method and apparatus, and terminal |
| CN112396819A (en) * | 2019-08-16 | 2021-02-23 | 北京小米移动软件有限公司 | Infrared communication device, system, method, terminal device and storage medium |
| CN112396819B (en) * | 2019-08-16 | 2022-06-03 | 北京小米移动软件有限公司 | Infrared communication device, system, method, terminal device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070050436A (en) | 2007-05-15 |
| TW200607273A (en) | 2006-02-16 |
| WO2006016320A1 (en) | 2006-02-16 |
| JP2008509621A (en) | 2008-03-27 |
| CN1993918A (en) | 2007-07-04 |
| EP1779573A1 (en) | 2007-05-02 |
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