CN101919174A

CN101919174A - Signal transmitting method and apparatus based on unitary space-time coding

Info

Publication number: CN101919174A
Application number: CN200880123943.6A
Authority: CN
Inventors: 王磊; 吴克颖; 朱孝龙
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2008-01-17
Filing date: 2008-01-17
Publication date: 2010-12-15
Anticipated expiration: 2028-01-17
Also published as: CN101919174B; WO2009089657A1

Abstract

A method for transmitting signals based on unitary space-time coding in a transmitter in a wireless communication network comprises: using multi blind detection coding matrices carrying on blind detection coding process to multi channels of signals to be coded separately, in order to generate multi channels of signals to be transmitted which are processed by blind detection coding(S12); transmitting the multi channels of signals to be transmitted which are processed by blind detection coding in multi symbol periods via a plurality of transmitting antennas(S14). A transmitting apparatus, a transmitter, and a network device use the method. The present invention doesn't need the channel status information when detecting the signals, has a lower coding complexity, a higher usage rate of spectrum, could be used to a transmitter with any number of transmitting antennas, could realize full diversity gains automatically, and improves the system performance during high data rates periods.

Description

Signal transmitting method and apparatus based on unitary space-time coding

A kind of signaling method and engineering device technique field based on unitary space-time coding

The present invention relates to signaling method and device based on unitary space-time coding in cordless communication network, more particularly to cordless communication network.Background technology

In following cordless communication network, Multiple Input Multiple Output (MIMO) is by for realizing the higher availability of frequency spectrum, higher channel width and higher message transmission rate.Space Time Coding occupies very important status in mimo systems as a kind of emission diversity scheme.

In Space-Time Codes, linear dispersion（LD) code is a kind of conventional coded system, and it is not only able to support high data transfer rate, meanwhile, its quantity to transmitting antenna or reception antenna is not strict with.In receiving terminal, LD codes are detected, it is necessary to channel knowledge status information.In actual applications, generally channel condition information is obtained using training mechanism.But, training mechanism is not equal to all scenario to be applicable, for example, when transmitting terminal or receiving terminal are in high-speed motion state using many antennas or mobile terminal, the fading factor obtained between each transmitting antenna and each reception antenna will become unrealistic.

Naturally, the research direction of people starts to turn to the coding techniques for not requiring that receiver knows channel condition information, without carrying out channel estimation.Unitary space-time modulation（USTM) be exactly it is a kind of can support to carry out the modulation technique of noncoherent detection independent of channel condition information, and become very attractive recently.In USTM technologies, the most typical system design scheme for propositions such as AT＆T Labs Hochwald, the planisphere construction of the program needs to rely on very numerous and diverse computer search process, when constellation size is larger, the retrieving will be very poorly efficient, also, the quantity of transmitting antenna is more, the retrieval is also more difficult.In addition, the system design scheme can only bring extremely limited diversity gain, thus the poor-performing when data transfer rate is higher when constellation size is larger.The content of the invention

In view of prior art has above mentioned problem, adjusted it is an object of the invention to provide one kind coding Scheme processed, the program should be realized efficient coding and obtain full marks diversity gain while ensureing that receiver need not carry out channel estimation.

To realize above-mentioned technical purpose, according to the first aspect of the invention there is provided a kind of method for being used to send signal based on unitary space-time coding in the emitter of cordless communication network, wherein, comprise the following steps：B. blind Detecting coded treatment is carried out respectively to multichannel signal to be encoded using multiple blind Detecting encoder matrixs, to generate the signal to be sent that multichannel is encoded through blind Detecting；C. the signal to be sent that the multichannel is encoded through blind Detecting is sent in multiple symbol periods via multiple transmitting antennas.

It is used to send the first dispensing device of signal based on unitary space-time coding in the emitter of cordless communication network there is provided a kind of according to the second aspect of the invention, wherein, including：Code device, for carrying out blind Detecting coded treatment respectively to multichannel signal to be encoded using multiple blind Detecting encoder matrixs, to generate the signal to be sent that multichannel is encoded through blind Detecting；Second dispensing device, for sending the signal to be sent that the multichannel is encoded through blind Detecting in multiple symbol periods via multiple transmitting antennas.

Compared to prior art, the present invention at least has the advantage that:

1. compared to existing LD encoding schemes, receiver is when the docking collection of letters number is detected in the present invention, without relying on channel condition information, it is achieved thereby that blind Detecting；

2. the blind Detecting coding in emitter has relatively low encoder complexity；

3. for the emitter with any multi-emitting antenna, the present invention can be applicable；

4. encoding scheme proposed by the present invention can realize larger diversity gain（Proved in detail hereinafter in conjunction with analogous diagram）；

5. in High Data Rate, the coding efficiency based on the present invention has greatly improved compared to existing scheme.Brief description of the drawings

The following detailed description to non-limiting example is read by referring to accompanying drawing, other features, objects and advantages of the invention will become more apparent upon.

Fig. 1 is the transmitting set physical layer architecture schematic diagram in the prior art based on LD codings；Fig. 2 is that the flat Rayleigh fading with M transmitting antenna and N number of reception antenna is wireless Communication MIMO system schematic diagram；

Fig. 3 is a MIMO network diagram；

Fig. 4 be according to specific embodiment of the present invention be used in the emitter of cordless communication network the method flow diagram of signal is sent based on unitary space-time coding；

Fig. 5 is the emitter physical layer schematic diagram of a specific embodiment according to the present invention；Fig. 6 is to be used in the emitter of cordless communication network send the first dispensing device block diagram of signal based on unitary space-time coding according to the specific embodiment of the present invention；

Figure is the bit error rate (BEP) comparative result emulation schematic diagram of the invention with the existing USTM technologies based on system design；

Fig. 8 is the symbol error rate of the invention with the existing USTM technologies based on system design

(SEP) comparative result emulation schematic diagram.

Wherein, same or analogous reference represents same or analogous device（Module）Or step.

Wherein, same or analogous reference represents same or analogous steps characteristic/device.Embodiment

Fig. 1 shows the transmitting set physical layer architecture schematic diagram encoded in the prior art based on LD, wherein, it is convenient for statement, the core concept that some are eliminated with the present invention does not have device/module of material relation, it will be appreciated by those skilled in the art that clearness of the above-mentioned omission for specification and the support to claim do not have any materially affect.Diagram emitter is typically lain in base station, relay station or mobile terminal.

As seen from Figure 1, original source bits stream includes the data of Kx bit, after separation, and the bit stream of X bit, referred to as the 1st road to Κ roads bit stream, and any of which road bit stream is referred to as into kth road bit stream are respectively included as Κ roads.Each road bit stream respectively enters planisphere mapping device/module, so as to obtain K roads modulation symbol.Wherein, the modulation symbol is typically BPSK (phase-shift keying (PSK), also referred to as two-phase PSK）, QPSK (QPSK, also referred to as QPSK）Or 8PSK (eight phase phase-shift keying (PSK)s）Deng modulation symbol.

For P phase phase-shift keying (PSK)s（Herein, the P refers to the dimension of phase-shift keying (PSK)）Feelings Shape, wherein kth road modulation symbol will be shown as, wherein, with modulation system corresponding relation such as, BPSK is modulated ρ value： P=2;QPSK is modulated： P=4;8PSK is modulated：Wherein, 4=0,1 " .., -1 }, k=i ..._K。

Then, K encoder matrix { ^ } f is utilized₌₁Each road modulation symbol is modulated, so that spatial domain and time domain are modulated to, wherein, each encoder matrix^φFor the matrix of a T rows M row, Τ is the code word size of the LD codes, and Μ is equal to the transmitting antenna number of the emitter.

In view of the characteristic of LD codes may largely be determined by encoder matrix κ really

Fixed, the present invention special assigns ∑ by determining^φ" ^ with special property, its k=

One of be blind Detecting property.So-called blind Detecting, namely receiving terminal are detected in the docking collection of letters number（When detect), without channel condition information, also referred to as noncoherent detection.For convenience of introduction hereinafter to the present invention, existing USTM technologies are described as follows.USTM is with Differential space-time modulation and referred to as topmost two class need not carry out the modulation technique of channel estimation now.USTM can be regarded as PSK (phase-shift keying (PSK)s）A kind of extension under multiple antennas situation, it is relatively more suitable for the channel circumstance of block decline（That is, in multiple mark spaces, channel keeps constant）.Its substantive characteristics is, is mutually orthogonal between each row of transmission signal matrix.

Existing USTM channel models

Consider a wireless communication system for having M transmitting antenna and N number of reception antenna, as shown in Figure 2：

The signal of transmitting is in T mark space：

{s_t, wherein t=l ..., T;M=l ..., M, wherein, represent the signal launched t-th of moment from m-th of transmitting antenna.

The signal that receiver is received is shown as： i^xT, wherein, represent t-th of moment as the signal received by n-th of reception antenna；

Relation between the transmission signal and the reception signal can be characterized by following formula：

Wherein, ^, represents to receive the white noise of signal in t-th of moment, n-th of reception antenna pollution, it is independent same distribution（Li. Gaussian random variable d), and obey CN (0,1) distributions (Circularly Symmetric Complex Gaussian distributions).^m, n, t represents the channel fading factor from m-th of transmitting antenna to the channel n-th of reception antenna in t, it can be modeled with the unit impact response of channel, and each fading factor is statistical iteration with the Gaussian random variable of distribution (i Shang d) and obeys CN (0,1) distributions, and keep constant in T symbol period, that is, for=... Τ, there is h_m,_n,_t = h_{m n}.Its power is limited：

, then the average letter on n-th of reception antenna of t is represented

Make an uproar ratio（It is unrelated with transmitting antenna number）, then formula（1) following form can be rewritten as:

Wherein, S is the transmission signal matrix that T rows M is arranged, and H is the channel transfer matrices that M rows N is arranged, and W is the noise matrix that T rows N is arranged, and X phases should be the receipt signal matrix of T rows N row.

Signal through unitary space-time coding can be solved in receiving terminal by incoherent maximum likelihood decoding, existing research has shown that, the decoding of unitary space-time coding only needs the planisphere of the signal matrix received and tenth of the twelve Earthly Branches space-time signal, without any channel condition information, blind Detecting can be realized, exactly this feature causes unitary space-time coding so to attract the attention of people.The inventive method flow

Hereinafter, reference picture 3 and the first aspect of the present invention is provided with reference to Fig. 4, Fig. 5 Method is illustrated.Wherein, Fig. 3 show the sketch of a MIMO network；Fig. 4 is shown according to a specific embodiment of the invention in transmitters for sending the method flow diagram of signal based on unitary space-time coding；Fig. 5 shows the emitter physical layer schematic diagram of a specific embodiment according to the present invention.It will be appreciated by those skilled in the art that ordinal relation of each shown in Fig. 4 between walking only corresponds to the specific embodiment of the present invention, without constituting limiting the scope of the invention.Those skilled in the art are further appreciated that, not shown in Fig. 4 some with the present invention substantive content without direct relation the step of, the step of these are omitted is discussed below, also, the omission is on no any influence such as clearness of description of the invention.Without loss of generality, it is assumed that the base station A shown in Fig. 3 has M transmitting antenna, and shown relay station B has N number of reception antenna, by taking the situation that base station A sends a signal to relay station B as an example.

Referring initially to Fig. 5, wherein, original source bits stream includes the data of Kx bit, by separating treatment, it is divided into the bit stream that Κ roads respectively include X bit, and referred to as the 1st road to Κ roads bit stream, any of which road bit stream is referred to as kth road bit stream.Each road bit Liu Fen Do enter planisphere mapping device/module, so as to obtain K roads modulation symbol.Wherein, the modulation symbol is typically BPSK (two-phase PSK), QPSK (QPSKs）Or 8PSK (eight phase phase-shift keying (PSK)s）Deng modulation symbol.Hereinafter, with will not obscuring, by BPSK, QPSK, the modulation symbol obtained by 8PSK is referred to as phase-shift keying (PSK) modulation symbol, by BPSK, QPSK：, 8PSK mapping be referred to as PSK mapping.

For the situation of P phase phase-shift keying (PSK)s, wherein kth road modulation symbol it will be shown as, and further be expressed as=e^p", wherein, ρ value with modulation system corresponding relation such as,

PSK is modulated： P=2 ;QPSK is modulated： P=4 ;8PSK is modulated： P=8.Wherein ,/, G ^={ 0_?1,...₅P-1} _{5 k=1},..._K。

Referring to Fig. 4 and Fig. 5 is combined, the emitter in the step SlO t, base station A is .. to multichannel signal to be encoded, carry out diversity gain pretreatment.Specifically, according to the specific embodiment of the present invention, the step S10 is based on following formula：

'= ^sk (3) Wherein, it is signal Zhongk roads signal to be encoded to be encoded that the K roads are pre-processed through gain, and ^=0 as=l,；When=2 ..., when 2k -1.Then, it is shown as when as described above .The step

The gain effect that S10 is brought will be proved in detail below.

Then, in step S11, emitter is using K blind Detecting encoder matrix to step

The signal to be encoded that K roads obtained by S10 are pre-processed through gain carries out the modulation on space-time two-dimensional respectively, so as to generate K roads modulated signal, i.e., with blind Detecting encoder matrix Φ_ΑThe signal of diversity gain pretreatment is multiplied by, the signal that kth road is modulated by space-time two-dimensional is shown as：

According to this example, the K blind Detecting encoder matrix should meet following two conditions simultaneously：Condition 1:Φ Φ ,=Ι ^ * Τ/Κ, wherein, 1^ be 14 ranks unit square formation, Τ be the blind Detecting encode code word size, subscript Η represent to matrix carry out conjugate transposition operation；Condition 2: Φ Φ_λ,=0^, wherein ,=1,2...K, L k, ≠ k, 0_MRepresent the square formation of M ranks zero.

Wherein, being used for K blind Detecting encoder matrix being modulated respectively to the signal to be encoded that K roads are pre-processed through diversity gain in emitter, { J i can statically be set in advance, for signal all the way, always have one it is fixed while meet the blind Detecting matrix of above-mentioned condition 1,2 and correspond to therewith and for carrying out space-time two-dimensional modulation to it.

Alternatively, K blind Detecting encoder matrix { Φ * } ^ can also be in-time generatin/determination for the progress blind Detecting coding, and determining the mode of the blind Detecting encoder matrix includes：

- according to predetermined algorithm, it is determined that meeting Κ blind Detecting encoder matrix of the condition 1,2 simultaneously, blind Detecting coding is carried out for treating encoded signal；

- by the blind Detecting encoder matrix pond that prestores（It is used to treat encoded signal progress blind Detecting coding including multiple blind Detectings coding square.

Then, it is described in the case of needing to determine blind Detecting matrix for each road signal to be encoded Also include step between step S10 Yu Bu Sudden Sl l：The signal to be encoded pre-processed for the multichannel through gain determines blind Detecting encoder matrix respectively.In step S11 after, base station A emitter using K blind Detecting encoder matrix determined by step S10 come to K roads through increasing j --- l_kv_k κ

The signal to be encoded of benefit pretreatment^p }_Α=1Carry out space-time two-dimensional modulation treatment.

Signal { the Φ that each road obtained by step S11 is modulated through space-time two-dimensional It is the matrix form of T rows M row.

Then, in step s 12, emitter merges the encoded signal that the K roads are modulated through space-time two-dimensional, namely, K roads encoded signal enters adder as shown in Figure 5, the LD codes as represented by following formula, namely the matrix that a T rows M is arranged are obtained, is regarded as M roads signal to be sent：((4), wherein,

Τ = [/₂·4Γ。

In this example, the step Sl l and S12 can regard the process that blind Detecting coding is carried out to signal as in the lump.Wherein, K roads PSK stream of modulation symbols signal obtains a unitary space-time coding matrix after merging again by the modulation of blind Detecting encoder matrix（Including M roads signal to be sent）.

It can be seen that, formula（4) formula can be further abbreviated as（5) form in：

Wherein (subscript

Γ represents transposition）, will Cylinder is written as the Θ (matrixes of-individual Τ rows Μ Κ row）Afterwards, formula（5) it is further deformed into：Then,

Therefore, the LD codes of gained can regard a tenth of the twelve Earthly Branches space-time matrix as, but, from unlike existing unitary space-time modulation scheme, encoded signal is treated present invention uses the blind Detecting encoder matrix with specific structure to be modulated, thus building method is relatively simple, and non-used is tired of Suo computer search to obtain USTM planispheres. Hereafter, in step S13, emitter is by the unitary space-time coding matrix of gained namely M roads signal to be sent（Each of which road signal to be sent is matrix χ () row）In fourth mark space receiving terminal is sent to via its Μ transmitting antenna.Using the system model of the present invention

Assuming that in network shown in Fig. 2, base station Α has Μ transmitting antenna and relay station Β has N number of reception antenna, it is assumed that matrix H is the channel matrix and each h therein that M rows N is arranged

Element ' represent base station A i-th of transmitting antenna and relay station B j-th of reception antenna between path gain, and obey CN (0,1) distribution.Wherein, no matter whether channel is symmetrical（When channel symmetry, receiving terminal can carry out the detection of channel condition information with transmitting terminal）, we assume that the emitter at the A of base station is unaware of channel matrix H with the receiver at relay station B.In addition, also the blunt channels set in the system of ^ is quasi-static and keep constant in Τ symbol period, the change then independent in Τ different symbol periods.

Then, in Τ mark space, the LD code matrixes of a Τ rows Μ row are sent by Μ transmitting antenna（Based on unitary space-time coding）, it is shown below：

κ

k^SK (6) wherein, when emitter preferably treat encoded signal first carry out gain pretreatment then carry out blind Detecting coding again when, formula（6) ^ in represents the signal to be encoded that kth road is pre-processed through gain；And be directly as shown in Figure 5 to carrier-modulated modulation symbol when emitter omits diversity gain pretreatment operation ..., when ^^ carries out blind Detecting coding, formula（6) the carrier-modulated modulation symbol in expression kth road in.

Then, when channel matrix is H, such as formula（9) after the transmission signal shown in is sent, the matrix form such as formula of relay station B correspondingly received signal is reached（7 ) ：

Wherein, numerical value is the signal to noise ratio on each reception antenna at relay station B, and matrix W is additive white Gaussian noise（AWGN) matrix, element w therein meets CN (0,1) points The planisphere of the present invention

Send signal matrix χ () and constitute the special planisphere based on the present invention, following institute Wherein ,={ 0,1, -1 } and 1 two [/ .4], i.e.（κ -1) each element in * 1 dimensional vector Τ is taken from set Α.

The size of the planisphere is=ρ¹.It will be appreciated by those skilled in the art that the planisphere is different from the Ρ dimension PSK planispheres applied in the PSK mapping blocks shown in Fig. 1 or Fig. 5.Specifically, each signal in the planisphere that the innovative idea based on the present invention is constructed is a matrix signal, and each signal in Ρ dimension PSK planispheres is an invariant signal.The code check of the present invention

For the vector space of a b dimension, the number of orthogonal vectors can not be more than vector dimension in the space.I.e. The vector space being made up of the column vector that multiple T*l are tieed up is can be regarded as, therefore the number Μ Κ of orthogonal vectors can not be more than vector dimension Τ.Namely

ΜΚ<Τ.Assuming that the Τ of ware two, the then code check that the corresponding LD based on the present invention is encoded is shown below： .The systematic function introduced after the present invention

Diversity product present invention introduces after is shown below：

M

The min of ζ bis- [n (i-_z(x_aJ j)]

X_a,X_b C_LD,a≠b ^mOne¹ Wherein, I >=(UJ >=(U >=... >=(UJ >=O, and wherein For M x Metzler matrix X Χ_δ/ Γ singular value.Usually, when ^ is more than 0, that is, system is claimed（Planisphere^e^) obtain full marks diversity gain.

By following proof, those skilled in the art will be appreciated that, present invention introduces rear, and system can ensure to obtain the full marks diversity gain automatically：

For x (the jf x (J) in the planisphere of the present invention^HX (lf χ (Τ ' battle arrays

X, Χ/Γ possess Μ equal singular values, that is, have following formula

Τ,Τ'] ( 11) ,

Wherein, 1-[₂^], 1-Ui " ' ^ κ].By formula（Li) visible, ^ (, ') only just has maximum ι when essentially equal with Τ.That is, any two xp " xp " ' in), if Τ ≠ Γ, matrix x x r by void value be 1 singular value.By formula (12), it can release^e^ possesses non-zero diversity product, therefore, obtains full marks diversity gain.Apparatus structure is introduced

Fig. 6 is referred again to below and combines Fig. 2, Fig. 5 to illustrate the second aspect of the present invention.Wherein, Fig. 6 is to be used in the emitter of cordless communication network send the first dispensing device block diagram of signal based on unitary space-time coding according to the specific embodiment of the present invention.

Shown first dispensing device 10 includes code device 100, the second dispensing device 101, determining device 102 and diversity gain pretreatment unit 103, wherein, the code device 100 specifically includes space-time modulation device 1000 and merges device 1001.

It will again be assumed that the base station Α shown in Fig. 3 has M transmitting antenna, and shown relay station B has N number of reception antenna, and by taking the situation that base station A sends signal to relay station B as an example. Referring initially to Fig. 5, wherein, original source bits stream includes the data of Kx bit, by separating treatment, it is divided into the bit stream that Κ roads respectively include X bit, and referred to as the 1st road to Κ roads bit stream, any of which road bit stream is referred to as kth road bit stream.Each road bit stream respectively enters planisphere mapping device/module, so as to obtain K roads modulation symbol.Wherein, the modulation symbol is typically the modulation symbols such as BPSK, QPSK or 8PSK.Hereinafter, ground will not be obscured, the modulation symbol obtained by BPSK, QPSK, 8PSK are mapped is referred to as PSK modulation symbols.

For the situation of P phase phase-shift keying (PSK)s, wherein kth road modulation symbol it will be shown as and further be expressed as=e^{p k}, wherein, with modulation system corresponding relation such as, PSK is modulated p value： P=2;QPSK is modulated： P=4;8PSK is modulated： P=8.Wherein, l_keA = {0,l,...,P-l}, _k=1, is referring to Fig. 6 and combines Fig. 5, the K roads PSK modulation symbol .., into diversity gain pretreatment unit 103, then carries out diversity gain pretreatment to it.Specifically, according to the specific embodiment of the present invention, the operation performed by the diversity gain pretreatment unit 103 is based on following formula：

,=

Wherein, it is signal Zhongk roads to be encoded that the K roads are pre-processed through diversity gain, and ^=0 when=1;As=2 ..., ^：When=2k-.

■2π. ,2π.

J ¾ J—— L_kV_k

Then, when being shown as e as described above^pWhen, s_k,=_eP .The systematic function part that the gain effect that diversity gain pretreatment unit 103 is brought hereinbefore is introduced after the present invention has been described in detail, is repeated no more.

Then, the K roads signal for carrying out gain pretreatment through diversity gain pretreatment unit 103 by K blind Detecting encoder matrix will carry out unitary space-time modulation respectively in space-time modulation device 1000, so as to generate the encoded signal that K roads are encoded through blind Detecting, specifically, the signal pre-processed for kth road through gain, utilizes blind Detecting encoder matrix Φ_ΑMultiply it by, the encoded signal that obtained kth road is encoded through blind Detecting is shown as：_ks_k ^Vk =Φ, e^TkVk。 According to this example, the K blind Detecting encoder matrix meets following two conditions simultaneously：Condition 1:,=Ι */Κ, wherein, Ι_ΜFor the unit square formation of Μ ranks, Τ is the code word size that the blind Detecting is encoded, and subscript Η represents to carry out conjugate transposition operation to matrix；Condition 2: Φ Φ_λ,=0_Μ, wherein ,=1,2... Κ, and k' ≠ k, 0_MRepresent the square formation of M ranks zero.

Wherein, K blind Detecting encoder matrix { Φ for carrying out blind Detecting coding respectively to the signal to be encoded that K roads are pre-processed through gain is used in emitter_Α} ₌₁It can statically set in advance, for signal all the way, always there is a fixed blind Detecting matrix for meeting above-mentioned condition 1,2 to correspond to therewith and for carrying out blind Detecting coding to it.

Alternatively, the Κ blind Detecting matrix { jf₌₁In-time generatin/determination for the progress blind Detecting coding is can also be, determining the mode of the blind Detecting encoder matrix includes：

- according to predetermined algorithm, it is determined that meeting K blind Detecting encoder matrix of the condition 1,2 simultaneously, blind Detecting coding is carried out for treating encoded signal；

Then, in the case of needing to determine blind Detecting matrix for each road signal to be encoded, by the determining device 102 come the signal to be encoded pre-processed for the multichannel through gain determines blind Detecting encoder matrix respectively, and the blind Detecting encoder matrix of determination is supplied to the space-time modulation device 1000, then, the signal to be encoded that space-time modulation device 1000 is pre-processed using K blind Detecting encoder matrix determined by determining device 102 to the κ roads through gain

Carry out space-time two-dimensional modulation treatment.

Wherein, signal { Φ k of each road through space-time modulation obtained by being handled through space-time modulation device 1000^sk ^k) ti be T rows M row matrix form.

The obtained signal through space-time modulation is provided to the merging device 1001, then, is merged on the K roads through carrying out the encoded signal of space-time modulation using blind Detecting encoder matrix by the merging device 1001.Specific situation with reference to shown in Fig. 5, the merging device 1001 is realized by adder that can be shown in Fig. 5, and then obtains empty based on the tenth of the twelve Earthly Branches as represented by following formula When the LD encoder matrixs that encode, namely a T rows M row matrix, regarded as M roads signal to be sent：Π=, wherein,

τ = [ ₂ · .

Merge the signal after the merging that device 1001 is obtained and be supplied to second dispensing device 101, hereafter, the signal after the merging is sent to relay station B via its base station Α Μ transmitting antenna in Τ mark space by second dispensing device 101.

Hereinafter, then by contrasting the present invention with prior art the advantage place of the present invention is visually illustrated.

Compared with system design type USTM technologies in the prior art, advantage of the invention is especially embodied in in higher code efficiency.The present invention does not need any computer search in an encoding process, and can have the situation of any multi-emitting antenna suitable for emitter.In addition, the present invention automatically obtains full marks diversity gain, so that system has the bit error rate closely in low rate with the system design type USTM technologies, and there is in high-speed relatively low error performance.Specifically, in various constellations figure size（) simulation result under situation is described as follows：Where it is assumed that the transmitting antenna number of emitter is 2, the reception antenna number of receiver is 1, and correspondingly, K=4 then make code word size Τ=8.

Table 1 gives the diversity gain of the invention with the existing USTM technologies based on system design in the case of identical constellation sizes and the availability of frequency spectrum and compared：Table 1:It is of the invention to be compared constellation sizes spectrum utilization ζ ζ with existing USTM diversity gains

Rate（Bps/Hz) USTM of the present invention based on system design

8 3/8 0.8660 0.9198

32 5/8 0.6124 0.8133

64 3/4 0.6124 0.7446

256 1 0.5149 0.5606 512 9/8 0.5149 0.0972

1024 5/4 0.2851 0.0658 Fig. 7 are the bit error rate (BEP) comparative result emulation schematic diagram of the invention with the existing USTM technologies based on system design, wherein, constellation sizes are emulated for 8,64 and 512 situation respectively.Wherein, constellation is counted（Constellation sizes）During L=8,64 and 512, the mapping of PSK modulation symbols selects the phase-shift keying (PSK) of 2,4,8 systems respectively.For simplicity, L size has only been embodied in figure, because L==P^A3, L three values 8,64 and 512 correspond to BPSK, QPSK and 8PSK situation respectively.

As seen from Figure 7, the bit error rate of the two schemes when constellation sizes are 8 and 64 is more or less the same, still, after constellation sizes rise to 512, and performance of the present invention in terms of the bit error rate is much better than the existing USTM schemes.It is the most important factor for determining USTM performances that this, which is primarily due to diversity gain, and two schemes have close diversity gain when constellation sizes are 8 or 64, and when constellation sizes are 512, present invention offers the diversity gain that more existing USTM technologies are much bigger, so as to embody huge bit error rate advantage.Fig. 8 is the symbol error rate of the invention with the existing USTM technologies based on system design（SEP) comparative result emulation schematic diagram, wherein, constellation sizes are emulated for 32,256 and 1024 situation respectively.

The present invention except can construct size for=planisphere in addition to, the planisphere of other sizes can also be constructed.Especially, for set=^^_1In the signal points that do not include, the present invention obtains having the constellation accordingly counted by changing system that Κ symbol maps, this

j l_k

When modulation symbol=e^PhThe PSK mappings of different systems are respectively adopted, obtained constellation size is=^.For example, as L=32, symbol is derived from 4PSK, and symbol ^ is derived from

4PS, symbol ^ is derived from BPSK.

With result shown in Fig. 7 similarly, the present invention has very close performance when constellation sizes are 32,256 with the USTM technologies based on system design, still, and when constellation sizes are 1024, advantage of the invention is to show especially out. Embodiments of the invention are described above, but the invention is not limited in specific system, equipment and specific agreement, those skilled in that art can make various deformations or amendments within the scope of the appended claims.

Claims

Claims

1. a kind of is Wu the method for being used to send signal based on unitary space-time coding in line Tong Xin Wang Network emitter, wherein, comprise the following steps：

B. blind Detecting coded treatment is carried out respectively to multichannel signal to be encoded using multiple blind Detecting encoder matrixs, to generate the signal to be sent that multichannel is encoded through blind check；

C sends the signal to be sent that the multichannel is encoded through blind Detecting via multiple transmitting antennas in multiple symbol periods.

2. according to the method described in claim 1, it is characterised in that also include step before the step b：

A. multiple blind Detecting encoder matrixs are determined；

The step b also includes：

- using determined by the multiple blind Detecting encoder matrix to multichannel signal to be encoded carry out blind check ' J coded treatments, with generate the multichannel through blind check ' j coding signal to be sent.

3. method according to claim 2, it is characterised in that the step a also includes：- multiple blind Detecting encoder matrixs are selected in multiple alternative blind Detecting encoder matrixs prestored, and as identified multiple blind Detecting encoder matrixs.

4. according to the method in any one of claims 1 to 3, it is characterised in that the step b comprises the following steps：

M carry out blind Detecting coded treatment using K blind Detecting encoder matrix to K roads signal to be encoded, to generate the encoded signal that K roads are encoded through blind Detecting；

B2. processing is merged to the encoded signal that the K roads are encoded through blind Detecting, to generate the signal to be sent that M roads are encoded through blind Detecting.

5. method according to any one of claim 1 to 4, it is characterised in that the Space Time Coding is encoded including linear dispersion, the step b is shown below：

X (s„s₂ , . . . , s_k ) = _?Wherein, it is κ roads letter to be encoded

Number Zhongk roads signal to be encoded, for for being carried out to kth road signal to be encoded The blind Detecting encoder matrix of blind Detecting coding, and the blind encoder matrix Φ_&The following condition is met, wherein/^=1,2... Κ:

- Φ " ,=Ι χ Τ/Κ, wherein, Ι_ΜFor the unit square formation of Μ ranks, Τ is the code word size that the blind Detecting is encoded；

- Φ Φ_Α, = 0_Μ, wherein ,=l, 2...K, and ≠:, it is the square formation of M ranks zero.

6. method according to any one of claim 1 to 5, it is characterised in that also include before the step b：

I. gain pretreatment is carried out respectively to the K roads signal to be encoded, to generate the signal to be encoded that K roads are pre-processed through gain；

The step b also includes：

- the signal to be encoded pre-processed using K blind Detecting encoder matrix to the K roads through gain carries out blind Detecting coded treatment, to generate the signal to be sent that the M roads are encoded through blind Detecting.

7. method according to claim 6, it is characterised in that the K roads are to be encoded

.2π_.

Any road signal to be encoded in signal is Ρ system phase shift keying modulation symbols e^J, wherein 4=0,1 ... P-1, the step i is shown below：

s_k ,= s;^k, wherein s_k, it is the signal to be encoded that signal Zhongk roads to be encoded that the κ roads are pre-processed through gain are pre-processed through gain, also,

=o, when=1;

v_k=2k-l, when k=2 ..., K.

8. a kind of is Wu being used in line Tong Xin Wang Network emitter send the first dispensing device of signal based on unitary space-time coding, wherein, including：

Code device, for carrying out blind Detecting coded treatment respectively to multichannel signal to be encoded using multiple blind Detecting encoder matrixs, to generate the signal to be sent that multichannel is encoded through blind Detecting；State the signal to be sent that multichannel is encoded through blind Detecting.

9. the first dispensing device according to claim 8, it is characterised in that also include：Determining device, for determining multiple blind Detecting encoder matrixs； The code device is additionally operable to：

- the multiple blind Detecting the encoder matrix determined by carries out blind Detecting coded treatment to multichannel signal to be encoded, to generate the signal to be sent that the multichannel is encoded through blind Detecting.

10. the first dispensing device according to claim 9, it is characterised in that the determining device is additionally operable to：

- multiple blind Detecting encoder matrixs are selected in multiple alternative blind Detecting encoder matrixs prestored, and as identified multiple blind Detecting encoder matrixs；

The code device is additionally operable to：

- blind Detecting coded treatment is carried out to multichannel signal to be encoded using selected the multiple blind Detecting encoder matrix, to generate the encoded signal that multichannel is encoded through blind Detecting.

11. the first dispensing device according to any one of claim 8 to 10, it is characterised in that the code device includes：

Blind Detecting code device, for carrying out blind Detecting coded treatment to K roads signal to be encoded using K blind Detecting encoder matrix, to generate the encoded signal that K roads are encoded through blind Detecting；Merge device, for merging processing to the encoded signal that the K roads are encoded through blind Detecting, to generate the signal to be sent that M roads are encoded through blind Detecting.

12. the first dispensing device according to any one of claim 8 to 11, it is characterised in that the Space Time Coding is encoded including linear dispersion, the code device performs the operation being shown below：

κ

(s_l , s₂ , ..., s_k ) = X _?Wherein, be κ roads letter k to be encoded=

Number Zhongk roads signal to be encoded, ^ is the blind Detecting encoder matrix for carrying out blind Detecting coding to kth road signal to be encoded, and the blind encoder matrix meets the following condition simultaneously, wherein/c=l, 2...K:

- Φ Φ ,=Ι χ Τ/, wherein, 1^ is] the unit square formations of ^ ranks, Τ is the code word size that the blind Detecting is encoded；

- Φ ^=^, wherein Α '=1,2... Κ, and ' ≠ ^：,（^ is the square formation of Μ ranks zero.

13. the first dispensing device according to any one of claim 8 to 12, its feature It is, in addition to：

Pretreatment unit, for carrying out gain pretreatment to K roads Xin Fen Do to be encoded, to generate the signal to be encoded that K roads are pre-processed through gain；

The code device is additionally operable to：

- the signal to be encoded pre-processed using K blind Detecting encoder matrix to the K roads through gain carries out blind Detecting coded treatment, to generate the signal to be sent that the M roads are encoded through blind Detecting.

14. the first dispensing device according to claim 13, it is characterised in that the K

.2π__ιAny road signal to be encoded in the signal to be encoded of road is phase-shift keying (PSK) modulation symbol^k, wherein/_Α=0,1 ... Ρ -1, the pretreatment unit is used to perform the operation being shown below：

S_k ,= s_k ^vk, wherein, it is the signal to be encoded that signal Zhongk roads to be encoded that the K roads are pre-processed through gain are pre-processed through gain, and

v_k=, when 21;

v_k = 2k - \ , § k = D 。

15. the emitter in a kind of cordless communication network, it is characterised in that first dispensing device of signal is sent based on unitary space-time coding including being used for according to any one of claim 8 to 14.

16. the network equipment in a kind of cordless communication network, it is characterised in that including emitter according to claim 15.