CN101043241A - Multi-antenna communication method and system - Google Patents

Abstract

The invention discloses a method and system of emission signal in multi antenna communication. The method includes: A. MIMO system emission end possesses M emission antenna to emit k ways of emission signal; B. every symbol period of TTI of the emission end adopts K emission antenna and adopts space multiplexing and emits K ways of emission signal, one or more of remained M-K emission antenna is used to emit signal. When number of emission antenna is less than max number of useable emission antenna in single code mode, the remained emission antenna is used to time space block code to obtain diversity plus. The invention also provides a method of HAR cause of multi codes communication scheme in MIMO system.

Description

Multi-antenna communication method and system

Technical field

The present invention relates to the communications field, relate in particular to multi-antenna communication method and system.

Background technology

Multiple-input and multiple-output (MIMO, Muliti-Input Multi-Output) technology is meant at transmitting terminal and receiving terminal and uses a plurality of transmitting antennas and reception antenna respectively, signal transmits and receives by a plurality of antennas of transmitting terminal and receiving terminal, thereby improves each quality of services for users (bit error rate or data rate).And traditional communication system is singly to enter singly (Single-InputSingle-Output, SISO) system.Advance singly (Multiple-Input Single-Output, MISO) mode and advance to have more singly that (Single-InputMultiple-Output, SIMO) mode also is the part of MIMO based on transmit diversity and receive diversity more.

In the MIMO technology, use Alamouti Space-Time Block Coding transmission signals at present, to obtain diversity gain.In Alamouti Space-Time Block Coding technology, use two transmitting antennas simultaneously, transmit with mode shown in Figure 1.Can use one or more reception antenna at receiving terminal.Use two transmitting antennas simultaneously at transmitting terminal, for receiving terminal, can obtain diversity (diversity) gain of these two transmitting antennas.

(Space-Time Coding, STC) space diversity (Diversity) gain that has utilized mimo channel to provide in BER-SNR curve commonly used, shows as and can obtain steeper slope Space Time Coding.Among the STC according to the difference of coded system, can be divided into STTC (Space TimeTrellisCoding) again, ST Turbo Code (Space Time Turbo Code), STBC (Space Time Block Coding), difference STBC (DSTBC) or the like, the Alamouti scheme is the simple and classical example of STBC.

Submit in the motion of LTE in IEEE 802.20 standards and certain company, all adopted SCW (SingleCode Word) pattern, i.e. the single codeword pattern.Under the single codeword pattern, on a plurality of virtual transmitting antennas, the data flow behind each moment transmission of one line coding after a plurality of symbol strings in this data flow and the conversion, is assigned on each virtual transmitting antenna again and is launched.At each TTI (transmit time Interval), receiving terminal only feeds back a CQI information and an ACK/NACK, and (ACK is Acknowledge, the expression receiving terminal admits to receive and be correctly decoded this circuit-switched data, and NACK is Not Acknowledge, the expression receiving terminal does not admit to have received and be correctly decoded this circuit-switched data,) information, wherein CQI information is told The data which type of MCS (The modulationand channel coding scheme: modulation and channel coding schemes) of transmitting terminal behind corresponding TTI transmission of one line coding, and ACK/NACK information tells whether the data of transmitting terminal behind corresponding TTI transmission of one line coding have been received proper really decoding.

At above-mentioned send mode, receiver can be simple linear receiver, during such as known MMSE (least mean-square error) equalizer (equalizer) empty or emptyly realize frequently, also can be the receiver that the complicated data to the space multi-way transmission are carried out non-linear joint demodulation, such as the non-linear receiver that adopts interference cancellation techniques.

In IEEE 802.20 standards in the SCW pattern of defined, dimension (Rank) K that the receiving terminal feedback space is multiplexing, transmitting terminal is according to this dimension K, and each in a TTI must use K in all available M transmitting antennas to carry out the space multi-way transmission constantly; Transmitting terminal each moment in a TTI is used alternatingly all M transmitting antenna, promptly uses each transmitting antenna in turn, rather than only uses M middle fixed K individual.Such as transmitting terminal 4 transmitting antennas 1,2,3,4 are arranged, if when signal is launched, determine to use wherein 2 transmitting antennas, then each all uses 2 transmitting antennas constantly, but be to use any 2 transmitting antennas, be time dependent, several moment are used transmitting antenna 3,4 with transmitting antenna 1,2, several moment, several moment are used transmitting antenna 2,3..., the employed transmitting antenna of alternate so successively.

In existing launch scenario, comprise that also receiving terminal not only feeds back K that tells transmitting terminal to use all available M transmitting antennas, also feedback tells transmitting terminal uses which fixing in M transmitting antenna K transmitting antenna.

In above-mentioned prior art scheme, if the dimension K＜M of the spatial reuse of receiving terminal feedback, then each only uses M the K in the transmitting antenna to transmit constantly, so just can not make full use of remaining M-K transmitting antenna and improve the signal transmission performances.

Here introduce the notion of above-mentioned TTI and symbol period.In order to resist channel fading, and the error of transmission that brings of the interference of channel and noise, transmitting terminal is divided into a plurality of packets (Block) to the data of needs transmission, information bit in the same packet is carried out chnnel coding and interweaves, be modulated into a plurality of symbols again by Channel Transmission, and the length of transmitting so needed time of packet has determined the length of a TTI.Receiving terminal receives all symbols that comprise in the same packet earlier, carries out deinterleaving and decoding again.In the present invention, a TTI just is meant the time interval of transmitting such packet.

And each symbol in the packet that is transmitted in TTI can be distributed in different interval on the time domain, perhaps is distributed in different interval on the frequency domain, perhaps is distributed in the different intervals on the two dimensional surface of time domain and frequency domain.A symbol period as herein described just is meant an interval that symbol takies by Channel Transmission, the interval that perhaps takies, the perhaps interval that takies on the two dimensional surface of time domain and frequency domain on frequency domain on time domain.For example, in the described MIMO ofdm communication scheme of the document of IEEE 802.20 standard 2006-01-06 " MBFDD and MBTDD:Proposed Draft Air Interface Specification ", packet uses 8 OFDM symbols on the time domain, each OFDM symbol takies 16 subcarriers on the frequency domain, symbol period so, just be meant an interval on the two dimensional surface of time domain and frequency domain, 1 subcarrier on 1 OFDM symbol on the time domain just, and this packet has 8 * 16=128 symbol period.

For single codeword (SCW) pattern, can adopt the channel coding schemes of Turbo coding.Data flow to be sent is at first passed through operations such as chnnel coding, channel interleaving, rate-matched and planisphere mapping, launches (K is smaller or equal to M, and M is the number of transmitting antenna) through different antennas respectively for the data flow of K road phase same rate along separate routes then.At transmitting terminal, as shown in Figure 4, data flow to be launched adopts unified channel encoder, RM (Rate Matching, rate-matched) mode and modulation system, then all data are divided into the data flow of K road phase same rate, launch through different antennas respectively again.

As shown in Figure 4, channel coding module 202 is the Turbo code of 1/5 code check.Channel interleaving module 204 comprises two submodules, is respectively bit separation and bit permutation.Rate-matched module 206 is punched the sequence length of bringing as required or is repeated.Splitter 208 is to transmit assigning on each antenna according to certain rule through the sequence after the rate-matched.In existing SCW, the information bit mean allocation in the sequence is to each antenna.Modulation module 210 comprises two submodules, be respectively planisphere mapping block 210a and channelizing processing module 210b, wherein, the planisphere mapping comprises modulation systems such as BPSK, QPSK, 8PSK, 16QAM, 64QAM, channelizing is handled and is comprised OFDM or spread spectrum etc., and a plurality of transmitter modules, can be antenna.

The feedback quantity of this mode of SCW is less, and because the channel encoder that adopts has only one, therefore CRC check is at the data on all transmitting antennas, so H-ARQ mechanism is comparatively simple, in case showing, CRC check makes mistakes, all data when pre-treatment retransmit so, only need an ack/nack signal to get final product.

In current techniques, information sequence in the SCW system (being data flow to be sent) through the coding, interweave and rate-matched after carry out shunt, each antenna is uploaded the information bit of equal length when shunt, being about to information sequence divides equally on each antenna, add to send after entering the channelizing processing module after the verification sequence, as Fig. 3? shown in.In Fig. 3, the bit of representing with the oblique line lattice is an information bit, is check bit with the bit of grid representation.

Since the feedback the time standby be the average received SINR (Signal-to-Interference-and-Noise-Ratio of all transmitting antennas, signal and interference-to-noise ratio), if SINR does not wait even differs greatly on M the transmitting antenna, then have more error code on the less antenna of SINR, particularly the information bit error code on the less antenna of SINR can influence the performance of whole system, and the throughput of system also will inevitably have loss.

Have a kind of method, receiving terminal feedback notice transmitting terminal is to allow transmitting terminal know which or which received signal to noise ratio in its transmitting antenna is better.Transmitting terminal is assigned to this or some received signal to noise ratio transmitting antenna preferably to information bit as much as possible then, to improve the performance that receives.The shortcoming of this method is to need feedback, and the cost of use is higher.

Transmitting antenna can be physical antenna or virtual-antenna.

At ieee standard draft " IEEE P802.11n ^TM/ D1.03 " in, for dimension (Rank) K=3 of spatial reuse, the situation of number of transmit antennas M=4 has provided scheme, and is as shown in the table.

Table?n81-Constellation?mapper?output?to?spatial?mapper?input?for?STBC

From last form of last table as can be seen, dimension (Rank) K=3 at spatial reuse, under the situation of number of transmit antennas M=4, use antenna 1 and one group of Alamouti Space-Time Block Coding of antenna 2 emissions, and use the signal of antenna 3 and one group of spatial reuse of antenna 4 each spontaneous emission.

In above-mentioned process, if use the channel coding schemes of Turbo coding, information bit uses each antenna emission at random, the use Alamnouti Space-Time Block Coding that has emission, and the Alamouti Space-Time Block Coding that do not use that has is launched.Receive the performance that SINR little information bit error code can have a strong impact on whole system, the throughput of system also will inevitably have loss.

Summary of the invention

The invention provides the method and system of emission signal in multi antenna communication, can not make full use of a remaining M-K transmitting antenna, cause problems such as the wasting of resources in order to what exist in the solution prior art.

A kind of method of emission signal in multi antenna communication is provided in the embodiments of the invention, comprises:

A, mimo system transmitting terminal have M transmitting antenna, and emission K road transmits;

B, transmitting terminal each symbol period of TTI adopt K transmission antennas transmit to transmit by the parallel simultaneously emission K of spatial reuse road, and use one or more transmission antennas transmit signal that remains in M-K the transmitting antenna simultaneously.

The system that the single codeword pattern transmits in a kind of multi-antenna communication also is provided in the embodiments of the invention, has comprised the transmitting terminal of M transmitting antenna, adopted wherein K transmission antennas transmit signal, described K＜M also comprises:

The feedback information receiving element is used to obtain receiving terminal and uses information to transmitting terminal feedback transmitting antenna, and according to described feedback information, use number of transmission antennas K confirms to transmit;

Transmitting is provided with the unit, is used for according to described K, in M-K transmitting antenna of residue one or more is set does the sky time-code and transmit, and obtains diversity gain.

A kind of method of mixed automatic retransmission request process of the many code words communication plan that is used for mimo system also is provided in the embodiments of the invention, has may further comprise the steps:

A.MIMO system transmitting terminal has M transmitting antenna, by K transmission antennas transmit K circuit-switched data stream wherein; Chnnel coding is independently carried out on each road of K circuit-switched data stream respectively; When the q time re-transmission of HARQ (mixed automatic retransmission request), if the N in the signal of K road _DecThe road signal is correctly decoded, and when the q+1 time re-transmission of HARQ, transmitting terminal only sends the K-N that also is not correctly decoded so _DecThe redundant information of road signal;

If N B. _DecMore than or equal to 1, so before launched N _DecThe N that the road signal is used _DecOne or more transmitting antenna in the individual transmitting antenna also is used for transmitting.

A kind of method of emission signal in multi antenna communication is provided in the embodiments of the invention in addition, has comprised:

A, mimo system transmitting terminal have M transmitting antenna, and emission K road transmits;

B, K are less than M, and at least two transmission antennas transmit are adopted, to obtain space diversity gain at least one road during the K road transmits behind the coding.In a TTI, at least one road signal of at least two transmission antennas transmit is adopted in the coding back, and the combination and variation of employed at least two transmitting antennas at least once.

A kind of method of emission signal in multi antenna communication also is provided in the embodiments of the invention, M transmitting antenna has been arranged, having comprised at transmitting terminal:

A, need information transmitted through a Turbo encoder encodes after, obtain comprising that the coding result of information bit and check bit, coding result are divided into the emission of K road, wherein K is less than M;

At least one road during B, K road transmit, at least two transmission antennas transmit are adopted in the coding back, to obtain space diversity gain;

C, at least one road signal that adopts at least two transmission antennas transmit behind the coding, distribute more information bit.

Beneficial effect of the present invention is as follows:

Among the present invention program's the embodiment, when during less than the available transmission number of antennas of maximum, remaining transmitting antenna being used for doing Space-Time Block Coding (Spacetime Block coding) to obtain diversity gain according to the used number of transmit antennas of feedback under the single codeword pattern.

Description of drawings

Fig. 1 is the schematic diagram that uses two transmission antennas transmit Alamouti Space-Time Block Codings in the prior art;

Fig. 2 is a main flow chart of the present invention;

Fig. 3 is a system configuration schematic diagram of the present invention; And

Fig. 4 shows the block diagram according to the emission modulating device of prior art.

Embodiment

Below in conjunction with Figure of description the specific embodiment of the present invention is described.

As shown in Figure 2, be main flow schematic diagram of the present invention, this scheme has M transmitting antenna at transmitting terminal, as can be seen from Fig. 2, mainly may further comprise the steps:

S100, mimo system transmitting terminal have M transmitting antenna, select K transmission antennas transmit K road wherein to transmit.

Alternatively, suppose that this mimo system is closed-loop system (but the present invention does not limit therewith), then receiving terminal uses information to transmitting terminal feedback transmitting antenna, indicates the next TTI can be by the spatial reuse number K that transmits of each road of difference of parallel emission simultaneously, described K＜M; In the present invention, in fact K is the number that next TTI can transmit by each different road of the parallel simultaneously emission of spatial reuse, described K＜M; If be K=M, so just adopt prior art.

Receiving terminal is according to reception information, and dimension (Rank) K that feedback space is multiplexing, indication transmitting terminal in next TTI, use all available M the K in the virtual transmitting antenna to carry out the space multi-way transmission according to this dimension K.

S200, transmitting terminal adopt described K transmission antennas transmit signal at described TTI, and use one or more transmitting antenna in M-K transmitting antenna of residue to do Space-Time Block Coding simultaneously to transmit, obtain diversity gain.

After the antenna use information of transmitting terminal receiving terminal feedback in receiving step S100, confirm the necessary number of transmit antennas K that uses in the next TTI according to this indication, and adopt described K transmission antennas transmit signal at described TTI, among the present invention program's the embodiment, in M-K transmitting antenna of use residue simultaneously one or more done Space-Time Block Coding and transmitted, and obtains diversity gain.

Generally only consider that transmitting terminal has the situation of 2 transmitting antennas or 4 transmitting antennas in the prior art, the present invention is example with the both of these case, illustrates that the present invention obtains the signal transmitting method of diversity gain.

The employed transmitting antenna of SCW pattern of the present invention program's embodiment can be virtual transmitting antenna, also can be the physical transmit antenna, and when signal transmission performance was discussed, both can equivalent processes.If virtual transmitting antenna, vector and one or more matrix multiples that can form transmitting obtain result vector, then the every of described result vector are launched respectively and are got final product through a channel arrival receiving terminal by each different transmitting antenna of transmitting terminal.

In the process of discussing below, use the notion of physical transmit antenna, its conclusion can be generalized to the situation of using virtual transmitting antenna very naturally.

Scheme one: transmitting terminal has the situation of M=2 transmitting antenna.

At transmitting terminal 2 transmitting antennas are set, if dimension K=1 of the spatial reuse of receiving terminal feedback, each TTI only uses a transmitting antenna in the prior art, and the form of signal emission as shown in Figure 1.Transmit and in a TTI, use transmitting antenna 1 emission in continuous several symbols, in ensuing several continuous symbols, use transmitting antenna 2 emissions.

In the method for the invention, if dimension K=1 of the spatial reuse of receiving terminal feedback, each moment of the inventive method or subcarrier all use 2 all transmitting antennas, can adopt the empty time-division encoding scheme of Alamouti, and the form of signal emission is:

$A_1^{\′}=\left[\begin{array}{cc}{s}_i& s_{i+1}\\ -s_{i+1}^{*}& s_i^{*}\end{array}\right],$

1,2 row of this emission matrix are corresponding with transmitting antenna 1 and transmitting antenna 2, emission matrix 2 capable corresponding on time-domain, and perhaps on frequency domain, the perhaps continuous point of 2 on time and frequency domain.See easily from the launch scenario of scheme one, can obtain space diversity gain at receiving terminal.

The distance of representing between the every row of above-mentioned emission matrix is 1 symbol not necessarily, and may be a plurality of symbols, can refer to a plurality of subcarrier spacings on the frequency domain.

Scheme two: transmitting terminal has the situation of M=4 transmitting antenna.

Scheme two has multiple situation, depends on the dimension K of the spatial reuse of receiving terminal feedback, describes respectively below.

If dimension K=1 of the spatial reuse of 1 receiving terminal feedback, each moment or subcarrier only use a transmitting antenna in the prior art, and the form of signal emission is:

$\left[\begin{array}{cccc}{s}_i& 0& 0& 0\\ 0& s_{i+1}& 0& 0\\ 0& 0& s_{i+2}& 0\\ 0& 0& 0& s_{i+3}\end{array}\right]$

Promptly transmit usually and use transmitting antenna 1 emission in continuous several symbols in this TTI, use transmitting antenna 2 emissions in ensuing several symbols continuously, follow-up is to launch with transmitting antenna 3 and transmitting antenna 4 successively, transmitting antenna 1 like this, 2,3,4 alternate cycles.

The form of signal emission of the present invention is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\\ 0& 0& s_{i+2}& s_{i+3}\\ 0& 0& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& 0& 0& s_{i+5}\\ -s_{i+5}^{*}& 0& 0& s_{i+4}^{*}\\ 0& s_{i+6}& s_{i+7}& 0\\ 0& -s_{i+7}^{*}& s_{i+6}^{*}& 0\\ 0& s_{i+8}& 0& s_{i+9}\\ 0& -s_{i+9}^{*}& 0& s_{i+8}^{*}\\ s_{i+10}& 0& s_{i+11}& 0\\ -s_{i+11}^{*}& 0& s_{i+10}^{*}& 0\end{array}\right]$

In one group of Alamouti Space-Time Block Coding cycle of two behaviors of above-mentioned matrix, in totally 6 Alamouti Space-Time Block Coding cycles, the order that can change each Alamouti Space-Time Block Coding cycle is arbitrarily becoming each row that can also change matrix in the channel arbitrarily slowly.Promptly in different continuous several symbols, use two in 4 transmitting antennas to make up respectively, send one group of Alamouti Space-Time Block Coding.By this radiation pattern, utilized and specified 1 transmitting antenna in the feedback signal, a transmitting antenna with appointment in remaining 3 transmitting antennas sends Space-Time Block Coding, obviously can obtain diversity gain.

If dimension K=2 of the spatial reuse of 2 receiving terminals feedback, each moment of prior art or subcarrier only use 2 transmitting antennas to carry out the signal emission, and the form of signal emission is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ 0& s_{i+2}& s_{i+3}& 0\\ 0& 0& s_{i+3}& s_{i+4}\\ s_{i+5}& 0& 0& s_{i+6}\\ 0& s_{i+7}& 0& s_{i+8}\\ s_{i+9}& 0& s_{i+10}& 0\end{array}\right]$

Promptly transmit usually and in several continuous symbols, use transmitting antenna 1 and transmitting antenna 2 emissions, in ensuing several symbols continuously, use transmitting antenna 2 and transmitting antenna 3 emissions, the signal emission is carried out in the combination of the follow-up combination of using transmitting antenna 3 and transmitting antenna 4 successively and transmitting antenna 1 and transmitting antenna 3, transmitting antenna 1 like this, 2,3,4 the circulation of combined and alternatively in twos.

The form of signal emission of the present invention is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+1}^{*}& s_i^{*}& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& s_{i+5}& s_{i+6}& s_{i+7}\\ -s_{i+6}^{*}& -s_{i+7}^{*}& s_{i+4}^{*}& s_{i+5}^{*}\\ s_{i+8}& s_{i+9}& s_{i+10}& s_{i+11}\\ -s_{i+11}^{*}& -s_{i+10}^{*}& s_{i+9}^{*}& s_{i+8}^{*}\end{array}\right]$

From above-mentioned emission matrix as can be seen, the 1st, 2 row is that antenna 1,2 is formed one group, and antenna 3,4 is formed one group, Alamouti Space-Time Block Coding in the group, and spatial reuse between group; The 3rd, 4 row is that antenna 1,3 is formed one group, and antenna 2,4 is formed one group, Alamouti Space-Time Block Coding in the group, spatial reuse between group; The 5th, 6 row is that antenna 1,4 is formed one group, and antenna 2,3 is formed one group, Alamouti Space-Time Block Coding in the group, spatial reuse between group.By this radiation pattern, utilized all residue antennas of specifying behind the transmitting antenna to send Space-Time Block Coding with given antenna, obviously can obtain diversity gain.

If dimension K=3 of the spatial reuse of 3 receiving terminals feedback, each moment of prior art or subcarrier only use 3 transmitting antennas, and the form of signal emission is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& 0\\ 0& s_{i+3}& s_{i+4}& s_{i+5}\\ s_{i+6}& 0& s_{i+7}& s_{i+8}\\ s_{i+9}& s_{i+10}& 0& s_{i+11}\end{array}\right]$

Promptly transmit usually and in several continuous symbols, use transmitting antenna 1, transmitting antenna 2 and transmitting antenna 3 emissions, in ensuing several symbols continuously, use transmitting antenna 2, transmitting antenna 3 and transmitting antenna 4 emissions, follow-up is to launch with the combination of transmitting antenna 1, transmitting antenna 3 and transmitting antenna 4 and the combination of transmitting antenna 1, transmitting antenna 2 and transmitting antenna 4 successively, transmitting antenna 1 like this, 2,3,4 three or three combined and alternativelies circulation.

The form of signal emission of the present invention is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& t_i& t_{i+1}\\ -s_{i+1}^{*}& s_i^{*}& t_{i+2}& t_{i+3}\\ s_{i+2}& t_{i+4}& s_{i+3}& t_{i+5}\\ -s_{i+3}^{*}& t_{i+6}& s_{i+2}^{*}& t_{i+7}\\ s_{i+4}& t_{i+8}& t_{i+9}& s_{i+5}\\ -s_{i+5}^{*}& t_{i+10}& t_{i+11}& s_{i+4}^{*}\\ t_{i+12}& s_{i+7}& s_{i+6}& t_{i+13}\\ t_{i+14}& s_{i+6}^{*}& -s_{i+7}^{*}& t_{i+15}\\ t_{i+16}& t_{i+17}& s_{i+8}& s_{i+9}\\ t_{i+18}& t_{i+19}& -s_{i+9}^{*}& s_{i+8}^{*}\\ t_{i+20}& s_{i+10}& t_{i+21}& s_{i+11}\\ t_{i+22}& -s_{i+11}^{*}& t_{i+23}& s_{i+10}^{*}\end{array}\right]$

Here s _iBe to adopt the signal of Alamouti Space-Time Block Coding with 2 transmitting antenna transmission, and t _iThe signal that is to use 1 transmitting antenna to transmit with the mode of spatial reuse.

From above-mentioned emission matrix as can be seen, the 1st, 2 row is that transmitting antenna 1 and transmitting antenna 2 are formed one group, Alamouti Space-Time Block Coding in the group, and spatial reuse between group, and transmitting antenna 3 and transmitting antenna 4 send signal respectively.The 3rd, 4 row is that transmitting antenna 1 and transmitting antenna 3 are formed one group, Alamouti Space-Time Block Coding in the group, and spatial reuse between group, and transmitting antenna 2 and transmitting antenna 4 send signal respectively; The 5th, 6 row is that transmitting antenna 1 and transmitting antenna 4 are formed one group, Alamouti Space-Time Block Coding in the group, and spatial reuse between group, and transmitting antenna 2 and transmitting antenna 3 send signal respectively, the rest may be inferred.By this radiation pattern, obviously can obtain diversity gain.

Above-mentioned institute act scheme can be done other deformation process, produces new scheme, such as can not using the Alamouti Space-Time Block Coding, and is to use other transmission plan that can reach diversity gain, and particularly other Space-Time Block Coding illustrates below.

If transmitting terminal has the situation of M=4 transmitting antenna, if dimension K=1 of the spatial reuse of receiving terminal feedback, technology of the present invention can also adopt any one in two kinds of following emission forms:

$X_4^{R=1}=\left[\begin{array}{cccc}{x}_1& x_2& x_3& x_4\\ -x_2^{*}& x_1^{*}& -x_4^{*}& x_3^{*}\\ -x_3^{*}& -x_4^{*}& x_1^{*}& x_2^{*}\\ x_4& -x_3& -x_2& x_1\end{array}\right]$

4 row of above-mentioned matrix, respectively corresponding 4 transmitting antennas; 4 row of above-mentioned matrix, 4 corresponding adjacent respectively symbol periods, so-called adjacent, can be that time-domain is adjacent, also can be frequency domain is adjacent.x _i, i=1, the different symbol of 2,3,4 expressions, x ^*The conjugation of representing plural x.

Perhaps,

$X_4^{R=3/4}=\left[\begin{array}{cccc}{x}_1& -x_2^{*}& \frac{x_3^{*}}{\sqrt{2}}& \frac{x_3^{*}}{\sqrt{2}}\\ x_2& x_1^{*}& \frac{x_3^{*}}{\sqrt{2}}& -\frac{x_3^{*}}{\sqrt{2}}\\ \frac{x_3}{\sqrt{2}}& \frac{x_3}{\sqrt{2}}& \frac{-x_1-x_1^{*}+x_2-x_2^{*}}{2}& \frac{x_2+x_2^{*}+x_1-x_1^{*}}{2}\\ \frac{x_3}{\sqrt{2}}& -\frac{x_3}{\sqrt{2}}& \frac{-x_2-x_2^{*}+x_1-x_1^{*}}{2}& -\frac{x_1+x_1^{*}+x_2-x_2^{*}}{2}\end{array}\right].$

4 row of above-mentioned matrix, respectively corresponding 4 transmitting antennas; 4 row of above-mentioned matrix, 4 corresponding adjacent respectively symbol periods, so-called adjacent, can be that time-domain is adjacent, also can be frequency domain is adjacent.x _i, i=1, the different symbol of 2,3 expressions, x ^*The conjugation of representing plural x.

The embodiment that the present invention provides is used for doing space and time diversity gain to remaining antenna, such as doing the Alamouti Space-Time Block Coding to obtain space diversity gain, utilize remaining antenna also to transmit, can adopt the coded system of the diversity gain that has living space arbitrarily to obtain diversity gain.

Among the present invention program's the embodiment, during less than the available virtual number of antennas of maximum, remaining antenna is used for doing Space-Time Block Coding to obtain diversity gain according to the used virtual-antenna number of feedback.Made full use of the transmitting antenna resource, and strengthened systematic function greatly by obtained diversity gain.

As shown in Figure 3, it is the structural representation of the system that the single codeword pattern transmits in the multi-antenna communication of the present invention, as seen from the figure, this system comprises the transmitting terminal 100 and the receiving terminal 200 of M transmitting antenna, transmitting terminal 100 adopts wherein K transmission antennas transmit signal, described K＜M, this system also comprises:

Feedback information receiving element 101 is used to obtain receiving terminal 200 and uses information to transmitting terminal feedback transmitting antenna, according to described feedback information, confirms that some TTI can be by the spatial reuse number K that transmits of each road of difference of parallel emission simultaneously;

Transmitting is provided with unit 102, is used for according to described K, in M-K transmitting antenna of residue one or more is set does Space-Time Block Coding and transmit, and obtains diversity gain.

Above-mentioned transmitting antenna is physical transmit antenna or virtual transmitting antenna.

Require patent application (the case 06WB3067 of Huawei of priority in the application, application number 200610071303.8, name is called " method and system that the single codeword pattern transmits in a kind of multi-antenna communication ") among the embodiment that provides, all be to use the Space-Time Block Coding coded system to transmit to obtain space diversity gain.Also have other coded system can obtain space diversity gain in the prior art, such as for the ofdm communication system that chnnel coding is arranged, have a kind of time delay deversity scheme CSD (Cyclic ShiftDiversity), its detailed introduction can list of references London Conference on August 29th, 2005 to September 2 on the 3GPP motion TSG RAN WG1 #42 R1-050715 of " EUTRA Downlink MIMO Requirements and Design " by name of Motorola Inc..Use the coding method of time delay deversity scheme CSD and Space-Time Block Coding in addition simultaneously, can reach better space diversity effect, the 3GPP motion 3GPP TSGRAN WG1 Meeting #44 R1-060438 of by name " the CombinedSTBC/CDD transmission scheme for multiple antennas " of its detailed introduction on can list of references U.S.'s Denver's meeting on February 13rd, 2006 to February 17.

Above-mentioned time delay deversity scheme CSD, and the method for time delay deversity scheme CSD and the combination of Space-Time Block Coding coded system, can be applied in the solution of the present invention.

When the solution of the present invention is applied to the ofdm communication system of chnnel coding, receiving terminal uses information to transmitting terminal feedback transmitting antenna, the number K that indicates some TTI to transmit by each road of difference of the parallel simultaneously emission of spatial reuse, under the situation of described K＜M, transmitting terminal adopts K transmission antennas transmit to transmit by the described K of the parallel simultaneously emission of spatial reuse road at described TTI, and one or more transmitting antenna in M-K transmitting antenna of use residue simultaneously, use the Space-Time Block Coding coded system, the perhaps coded system of time delay deversity scheme CSD, perhaps use the coded system of time delay deversity scheme CSD and Space-Time Block Coding simultaneously, transmit to obtain space diversity gain.Specific embodiment is as follows:

Have at transmitting terminal under the situation of M=4 transmitting antenna, if dimension K=3 of the spatial reuse of receiving terminal feedback, technology of the present invention can also adopt following emission form emission K=3 road signal, promptly launch the result after wherein one road signal use time delay deversity scheme CSD encodes, and transmitting antenna 3 and transmitting antenna 4 send one road signal of spatial reuse respectively by transmitting antenna 1 and transmitting antenna 2.

Have at transmitting terminal under the situation of M=4 transmitting antenna, if dimension K=3 of the spatial reuse of receiving terminal feedback, technology of the present invention can also adopt following emission form emission K=1 road signal, promptly earlier this road signal is used the method coding of Alamouti Space-Time Block Coding, obtain the signal after 2 road Alamouti Space-Time Block Codings are encoded, signal after again the 1 road Alamouti Space-Time Block Coding wherein being encoded is delivered to transmitting antenna 1 and transmitting antenna 2 emissions after using time delay deversity scheme CSD coding, and delivering to transmitting antenna 3 and transmitting antenna 4 emissions behind the signal use time delay deversity scheme CSD coding behind the 2 road Alamouti Space-Time Block Coding coding wherein.

The present invention also is used for idle antenna to transmit to obtain the method for space diversity gain, and the dimension K of spatial reuse that not only can be used for receiving terminal feedback also can be used for other scene less than the scene of number of transmit antennas M.

Each major company in 3GPP2 standardization body unites among the AIE normative document C30-20060731-040_HKLLMNQRSUZ_P2Phase2_FDD_Proposal_v1.9 that is called " Joint Proposal for3GPP2 Physical Layer for FDD Spectra " of submission, has provided the implementation method of HARQ (mixed automatic retransmission request) technology under the many code words of MIMO (MCW) pattern.

In the MCW of MIMO communication plan, there is multichannel to transmit, independently Turbo encoding scheme is all adopted separately on each road.For many patterns of code words, receiving terminal uses interference cancellation techniques can obtain very big gain, so many patterns of code words are used the non-linear receiver of interference eliminated usually.Receiving terminal is according to received signal, the Turbo of elder generation decodes, and riches all the way penetrates signal, after the decoding, judge according to CRC (cyclic redundancy code) check digit whether the decoding of this road signal is correct, if correct, then use decoded results, from received signal, eliminate the influence that transmits that this road has been correctly decoded, again according to the described received signal of having eliminated after the influence, decode another road of Turbo transmits; Carry out above-mentioned step like this iteratively, transmit up to all multichannels of decoding.

For many patterns of code words, after a certain road transmitted if Turbo decodes, the decoding of judging this road signal according to the CRC check position was incorrect, and receiving terminal can stop to decode and to the nack message of transmitting terminal emission corresponding to this road signal so.Transmitting terminal is retransmitted the redundant data packets that this road signal Turbo coding obtains, and the redundant data packets of Chong Faing mainly comprises the encode information of resulting check bit of Turbo generally speaking.Receiving terminal is the redundant data packets of retransmitting corresponding to this road signal then, with the packet that had before received corresponding to this road signal, join together to carry out the Turbo decoding, after this road transmits if Turbo decodes, the decoding of judging this road signal according to check digit is correct, just uses decoded results, eliminates the influence that transmits that this road has been correctly decoded from received signal, again according to the described received signal of having eliminated after the influence, decode another road of Turbo transmits.

In the MCW communication plan of MIMO, be provided with 4 tunnel transmit a, b, c, d, receiving terminal detects each road signal according to the sequencing of a, b, c, d, that is: at first detect data flow a, there is the interference of data flow b, c, d this moment, and it is correct to judge the decoding of this road signal according to check digit, eliminates transmitting to detecting the influence of follow-up data stream of data flow a with the decoded result of data flow a from received signal then; Second is detected data flow b, only there is the interference of data flow c, d this moment, and it is correct to judge the decoding of this road signal according to check digit, eliminates transmitting to detecting the influence of follow-up data stream of data flow b with the decoded result of data flow b from received signal then; The 3rd is detected data flow c, and only exist the interference of data flow d this moment, and the decoding of judging this road signal according to check digit is correct, eliminates transmitting to detecting the influence of follow-up data stream of data flow c with the decoded result of data flow c from received signal then; Detect data flow d at last, do not have the interference of other data flow this moment, and it is correct to judge the decoding of this road signal according to check digit.

A kind of situation is that data flow a is by correct decoding and eliminate its interference; And after detecting data flow b, the decoding of judging data flow b according to check digit is incorrect.So, from received signal, eliminate transmitting of data flow b because can't utilize the decoded result of data flow b to detecting the influence of follow-up data stream, the interference that data flow c, d are subjected to is bigger, receiving terminal is difficult to be correctly decoded, so can stop to decode and to the nack message of transmitting terminal emission corresponding to this road signal b.Transmitting terminal is retransmitted the redundant data packets that b road signal Turbo coding obtains.Receiving terminal is the redundant data packets of retransmitting corresponding to this road signal b then, with the packet that had before received corresponding to this road signal b, join together to carry out the Turbo decoding, after this road transmits if Turbo decodes, the decoding of judging this road signal b according to check digit is correct, just uses decoded results, the influence of the b that transmits that this road of elimination has been correctly decoded from received signal, again according to the described received signal of having eliminated after the influence, Turbo another road c that transmits that decodes.

In the scheme that this AIE normative document provides, when the q time re-transmission at HARQ, N _DecThe road signal is correctly decoded, and when the q+1 time re-transmission of HARQ, transmitting terminal does not send the packet of each the road signal that has been correctly decoded, and only sends the M-N that also is not correctly decoded so _DecThe redundant information of road signal, when sending these redundant informations, transmitting terminal is given this M-N available gross power mean allocation _DecThe road signal, and do not give other N _DecRoad signal allocation power, this is equivalent to before launch N _DecSignal employed transmitting antenna in road no longer transmits and leaves unused this moment.In the solution of the present invention, idle transmitting antenna also is used for transmitting, to reach the effect of space diversity.

An embodiment is as follows:

In the MCW communication plan of MIMO, be provided with 4 the tunnel and transmit a, b, c, d respectively by 1,2,3,4 emissions of 4 transmitting antennas, receiving terminal detects each road signal according to the sequencing of a, b, c, d.When the q time re-transmission at HARQ, data flow a is by correct decoding and eliminate its interference; And after detecting data flow b, the decoding of judging data flow b according to check digit is incorrect.

Scheme according to prior art, when the q+1 time re-transmission of HARQ, transmitting terminal only sends b, the c that also is not correctly decoded, the redundant information of d road signal, and the redundant information of not launching a road signal had so before been launched the employed transmitting antenna 1 of a road signal and left unused.

The solution of the present invention, using the idle employed transmitting antenna of previous emission a road signal is transmitting antenna 1, the redundant information of also launching b road signal is to obtain space diversity gain.Can be 2 emissions of transmitting antenna 1 and transmitting antenna uses result behind the time delay deversity scheme CSD coding to the redundant information of b road signal, or transmitting antenna 1 and transmitting antenna 2 emissions are used result behind the Alamouti Space-Time Block Coding coding to the redundant information of b road signal.Why using the redundant information of idle antenna emission b road signal, because being correctly decoded of b road signal is most important, is the c of decode successive, the prerequisite of d road signal.

As everyone knows, do not use deversity scheme promptly only by transmitting antenna 2 emissions to transmitting antenna 2 employed power in the scheme of the redundant information of b road signal, when using Alamouti Space-Time Block Coding coding or time delay deversity scheme CSD coding, be used transmitting antenna 1 and the transmitting antenna 2 of result after mean allocation is encoded to transmit diversity, total transmitting power can be do not increased like this, and better effect can be reached.

Under second kind of situation, when the q time re-transmission at HARQ, data flow a, b are by correct decoding and eliminate its interference; And after detecting data flow c, the decoding of judging data flow c according to check digit is incorrect.

Scheme according to prior art, when the q+1 time re-transmission of HARQ, transmitting terminal only sends the c that also is not correctly decoded, the redundant information of d road signal, the redundant information of not launching a, b road signal, and it is idle so before to have launched the employed transmitting antenna of a, b road signal 1,2.

The solution of the present invention is used idle transmitting antenna 1,2, and the redundant information of also launching c road signal is to obtain space diversity gain.Can be that transmitting antenna 1,2 and 3 is launched the result behind the redundant information use time delay deversity scheme CSD coding of c road signal, or use c road signal the method for Alamouti Space-Time Block Coding to encode earlier, obtain the signal after 2 road Alamouti Space-Time Block Codings are encoded, deliver to transmitting antenna 1 and transmitting antenna 2 emissions after again the signal behind the 1 road Alamouti Space-Time Block Coding coding wherein being used time delay deversity scheme CSD coding, and the signal behind the 2 road Alamouti Space-Time Block Coding coding is wherein directly delivered to transmitting antenna 3 emissions.

The solution of the present invention, the redundant information that can also be to use idle transmitting antenna 1,2 to launch c roads and d road signal is to obtain space diversity gain.The result behind the method coding of result behind the time delay deversity scheme CSD coding or Alamouti Space-Time Block Coding is used in transmitting antenna 1,3 emission to the redundant information of c road signal, the result behind the method coding of result behind the time delay deversity scheme CSD coding or Alamouti Space-Time Block Coding is used in transmitting antenna 2,4 emissions to the redundant information of d road signal.

Under the third situation, when when retransmitting, data flow a, b, c is by correct decoding and eliminate its interference the q time of HARQ; And after detecting data flow d, the decoding of judging data flow d according to check digit is incorrect.

Scheme according to prior art, when the q+1 time re-transmission of HARQ, transmitting terminal only sends the redundant information of the d road signal that also is not correctly decoded, and does not launch the redundant information of a, b, c road signal, and it is idle so before to have launched the employed transmitting antenna of a, b, c road signal 1,2,3.

The solution of the present invention is used idle transmitting antenna 1,2,3, and the redundant information of also launching d road signal is got space diversity gain with reed.Can be that transmitting antenna 1,2,3 and 4 is launched the result behind the redundant information use time delay deversity scheme CSD coding of c road signal; Also can be or the first method coding that c road signal is used the Alamouti Space-Time Block Coding, obtain the signal after 2 road Alamouti Space-Time Block Codings are encoded, signal after again the 1 road Alamouti Space-Time Block Coding wherein being encoded is delivered to transmitting antenna 1 and transmitting antenna 2 emissions after using time delay deversity scheme CSD coding, and delivering to transmitting antenna 3 and transmitting antenna 4 emissions behind the signal use time delay deversity scheme CSD coding behind the 2 road Alamouti Space-Time Block Coding coding wherein.

Require patent application (the case 06WB3067 of Huawei of priority in the application, application number 200610071303.8, name is called " among the embodiment that the method and system ") that the single codeword pattern transmits in a kind of multi-antenna communication provide, dimension K=3 when the spatial reuse of receiving terminal feedback, and transmitting terminal 4 transmitting antennas are arranged is under the situation of transmitting antenna 1, transmitting antenna 2, transmitting antenna 3 and transmitting antenna 4, the form of signal emission is:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& t_i& t_{i+1}\\ -s_{i+1}^{*}& s_i^{*}& t_{i+2}& t_{i+3}\\ s_{i+2}& t_{i+4}& s_{i+3}& t_{i+5}\\ -s_{i+3}^{*}& t_{i+6}& s_{i+2}^{*}& t_{i+7}\\ s_{i+4}& t_{i+8}& t_{i+9}& s_{i+5}\\ -s_{i+5}^{*}& t_{i+10}& t_{i+11}& s_{i+4}^{*}\\ t_{i+12}& s_{i+7}& s_{i+6}& t_{i+13}\\ t_{i+14}& s_{i+6}^{*}& -s_{i+7}^{*}& t_{i+15}\\ t_{i+16}& t_{i+17}& s_{i+8}& s_{i+9}\\ t_{i+18}& t_{i+19}& -s_{i+9}^{*}& s_{i+8}^{*}\\ t_{i+20}& s_{i+10}& t_{i+21}& s_{i+11}\\ t_{i+22}& -s_{i+11}^{*}& t_{i+23}& s_{i+10}^{*}\end{array}\right]$

As previously mentioned, s here _iBe to adopt the signal of Alamouti Space-Time Block Coding with 2 transmitting antenna transmission, and t _iThe signal that is to use 1 transmitting antenna to transmit with the mode of spatial reuse.The corresponding transmitting antenna of every row of above-mentioned matrix, symbol period of every line display, and the 1st, 2 row, the pairing symbol period of the 3rd, 4 row is all adjacent on time-domain or frequency domain, or the channel situation of pairing two symbol periods of adjacent at least two row can be similar to and think and remain unchanged.Top scheme, the transmission antenna group that expression is used to launch the Alamouti Space-Time Block Coding is combined in different Alamouti Space-Time Block Coding symbol periods and changes, get the combination of 2 antennas up to traveling through all possible 4 antennas, and the number of times that each combination is used is equal as far as possible at a TTI.

Require patent application (the case 06WB3067 of Huawei of priority in the application, application number 200610071303.8, name is called " among the embodiment that the method and system ") that the single codeword pattern transmits in a kind of multi-antenna communication provide, above-mentioned scheme is to be used to feed back the situation that constitutes closed loop, and promptly receiving terminal is to the situation of transmitting terminal feedback channel quality indication.

But for a person skilled in the art, obviously, above-mentioned scheme both can be used for closed loop, also can be used for open loop, because enforcement such scheme, the situation that does not depend on closed loop or open loop, just no matter whether receiving terminal be not the prerequisite of implementing such scheme to the indication of transmitting terminal feedback channel quality.In other words, the condition of the scheme implementation that the present invention is above-mentioned is: described mimo system transmitting terminal has M transmission antennas transmit K road (K is less than M) data flow, thereby (M-K) individual transmitting antenna idle in the prior art also is used for sending signal, to obtain space diversity gain; Implementation condition does not limit receiving terminal must use information to described transmitting terminal feedback transmitting antenna, indicates some TTI can be by the spatial reuse number K that transmits of each road of difference of parallel emission simultaneously.

In addition, s _iBe not defined as yet and adopt the signal of Alamouti Space-Time Block Coding with 2 transmitting antenna transmission, s _iCan also be to adopt the signal of time delay diversity CSD method coding back with 2 transmitting antenna transmission.If transmitting terminal has M=5 transmitting antenna, and s _iUse 3 transmission antennas transmit, s so after a road corresponding signal encoding _iCan also be the signal that uses time delay deversity scheme and Space-Time Block Coding coding back to transmit with 3 transmitting antennas simultaneously, the specific coding method as previously mentioned.

And the beneficial effect of enforcement such scheme under the situation of open loop, is that arrangement of eliminating each row of channel matrix changes the fluctuation of the value of the effective signal-to-noise ratio that is caused, thereby reduces the fluctuation of the effective signal-to-noise ratio of each packet, obtains better Packet Error Ratio performance.Under the situation of closed loop, because receiving terminal is to the channel quality indication of transmitting terminal feedback, exist certain probability of erasure (shown in the motion of certain company, this probability of erasure in addition reached 50%), be that receiving terminal is thought that the channel quality indication of feeding back is unreliable and do not used current value of feedback, but derive current channel quality according to the value of feedback in past, thus reduce the fluctuation of the effective signal-to-noise ratio of each packet, also can reduce Packet Error Ratio.

In dimension K=3 of above-mentioned spatial reuse, and transmitting terminal has the scheme of 4 transmitting antennas to be used for the single codeword pattern of multi-antenna communication, and when being used for the realization of open loop or closed loop, can adopt the channel coding method of Turbo code.In the above-mentioned scheme, the transmission antenna group of emission Alamouti Space-Time Block Coding is combined in a TTI and travels through the combination that all possible 4 antennas are got 2 antennas.

Also exist the transmission antenna group of emission Alamouti Space-Time Block Coding to be combined in the scheme that a TTI is fixed as some specific combinations, when this scheme is used for the realization of open loop or closed loop, also can adopt the channel coding method of Turbo code.An example of this scheme as stated in the Background Art, at ieee standard draft " IEEE P802.11n ^TM/ D1.03 " in; for dimension (Rank) K=3 of spatial reuse; the scheme that the situation of number of transmit antennas M=4 provides, promptly use antenna 1 and one group of Alamouti Space-Time Block Coding of antenna 2 emissions, and use the signal of antenna 3 and one group of spatial reuse of antenna 4 each spontaneous emission.

In two kinds of above-mentioned schemes, can send the information bit in the important Turbo code coding result by using receptivity Alamouti Space-Time Block Coding preferably as far as possible, improve the performance of receiving terminal, reduce the Packet Error Ratio of receiving terminal.The MIMO single codeword pattern that is used for the AIE standard with two kinds of above-mentioned schemes is an example below, and embodiment is described.

In the existing AIE standard, the unit of resource allocation is the piece of 16*8,16 subcarriers of expression frequency domain and 8 OFDM symbols of time domain.

Dimension (Rank) K=3 that the receiving terminal feedback space is multiplexing is under the situation of number of transmit antennas M=4.The Turbo coding generates after information bit and the check bit, and information bit inside interweaves, and check bit inside interweaves, and information bit after interweaving and check bit are modulated the symbol after being modulated accordingly more respectively.Wherein, the symbol that only comprises information bit is called information symbol, and the symbol that only comprises check bit is called checking symbol, and the area, boundary has a symbol and both comprised information bit and also comprise check bit.

The code check of supposing the Turbo coding is 1/3, uses the piece emission of a 16*8.Have 128 information symbol S so ₁, S ₂..., S ₁₂₈With 256 checking symbol T ₁, T ₂..., T ₂₅₆On per 16 16 subcarriers that are mapped to 1 OFDM symbol of 128 information symbols, obtain 8 OFDM symbol OFDM _ S ₁, OFDM_S ₂..., OFDM_S ₈, on per 16 16 subcarriers that are mapped to 1 OFDM symbol of 256 checking symbols, obtain 16 OFDM symbol OFDM _ T ₁, OFDM_T ₂..., OFDM_T ₁₆8 information OFDM symbol OFDM _ S ₁, OFDM_S ₂..., OFDM_S ₈As a stream, and 16 verification OFDM symbol OFDM _ T ₁, OFDM_T ₂..., OFDM_T ₁₆Be divided into two streams, adopt ieee standard draft " IEEEP802.11n ^TM/ D1.03 " in scheme when emission, a stream at information OFDM symbol place always is to use the emission of Alamouti Space-Time Block Coding, and the modes of two each personal spatial reuses of stream that verification OFDM symbol is divided into are launched.The power of each stream is identical, all is 1/3 of gross power P.Launch on flow point to two antenna that uses the Alamouti Space-Time Block Coding to launch, so the power of each antenna is P/6.Promptly the stream that 8 information OFDM symbols are formed carries out obtaining two streams behind the Alamouti Space-Time Block Coding coding, delivers to transmitting antenna 1 and transmitting antenna 2 emissions respectively; And 16 verification OFDM symbols are divided into two streams, deliver to transmitting antenna 3 and transmitting antenna 4 emissions respectively.

Above-mentioned an information OFDM symbols streams and 2 verification OFDM symbols streams also can be launched with above-mentioned the solution of the present invention, and two antennas both having launched the Alamouti Space-Time Block Coding change at different Alamouti Space-Time Block Coding symbol periods.The solution of the present invention needs 12 symbol periods could travel through all possible combination, and a present information OFDM symbols streams has only 8 information OFDM symbols, can't travel through.But use a user under the situation of piece of a plurality of 16*8, can travel through.Suppose that a user uses the piece of 1 16*8, have 8 OFDM symbols so, then the method for Shi Xianing is as follows.

In the time interval of first and second OFDM symbol, 2 information OFDM symbols are carried out obtaining 4 information OFDM symbols behind the Alamouti Space-Time Block Coding coding, deliver to transmitting antenna 1 and transmitting antenna 2 emissions respectively; And 4 verification OFDM symbols are delivered to transmitting antenna 3 and transmitting antenna 4 emissions respectively.In the time interval of the 3rd and the 4th OFDM symbol, 2 information OFDM symbols are carried out obtaining 4 information OFDM symbols behind the Alamouti Space-Time Block Coding coding, deliver to transmitting antenna 2 and transmitting antenna 4 emissions respectively; And 4 verification OFDM symbols are delivered to transmitting antenna 1 and transmitting antenna 3 emissions respectively.In the time interval of the 5th and the 6th OFDM symbol, 2 information OFDM symbols are carried out obtaining 4 information OFDM symbols behind the Alamouti Space-Time Block Coding coding, deliver to transmitting antenna 1 and transmitting antenna 4 emissions respectively; And 4 verification OFDM symbols are delivered to transmitting antenna 2 and transmitting antenna 3 emissions respectively.In the time interval of the 7th and the 8th OFDM symbol, 2 information OFDM symbols are carried out obtaining 4 information OFDM symbols behind the Alamouti Space-Time Block Coding coding, deliver to transmitting antenna 2 and transmitting antenna 3 emissions respectively; And 4 verification OFDM symbols are delivered to transmitting antenna 1 and transmitting antenna 4 emissions respectively.

Yet top scheme can reduce the interleave depth of Turbo coded system.Suppose 1/3 Turbo code rate, and be used for the MIMO transmission of K=3.Information bit inside interweaves so, and check bit inside interweaves, and modulation obtains symbol then, and wherein 1/3 is the symbol that only comprises information bit, and 2/3 be the symbol that only comprises check bit, can make that like this effect that interweaves is poor.Usually in each sign map in the process of each subcarrier of OFDM, each subcarrier of an OFDM, existing symbol that comprises information bit also has the symbol that only comprises check bit, reaches the effect that interweaves.

Top scheme, be each sign map each subcarrier to OFDM, the OFDM symbol that obtains then, being divided into 3 streams (because K=3) again delivers on 3 antennas and launches, one of them power that need adopt the stream of Alamouti Space-Time Block Coding is other half of stream, and then adopt the stream of Alamouti Space-Time Block Coding according to this needs, generate another minute afflux of its Alamouti Space-Time Block Coding coding, described another minute, afflux launched by the 4th antenna, and its power also is half of transmitting antenna of the multiplexing stream of other each emission space.

The shortcoming of top scheme is that each subcarrier of an OFDM of needs only has the symbol that comprises information bit, then this OFDM symbol is transmitted with Space-Time Block Coding.The further preferred embodiment of the present invention will be described below, realize supporting each subcarrier of an OFDM symbol, existing symbol that comprises information bit also has the symbol that only comprises check bit, thereby reaches the effect of the interleave depth that does not influence the Turbo coded system.

The improvement project that the present invention proposes:,, be called a time-frequency piece/symbol period with subcarrier on the frequency domain the time of the symbol of an OFDM on the time domain.The OFDM symbol is divided into 3 streams, guarantee this 3 streams, in the OFDM in same moment symbol at each identical subcarrier, promptly at each identical time-frequency piece, 3 symbols being launched, having and have only 1 symbol is the symbol that only comprises information bit, then this symbol that comprises information bit is transmitted with the Alamouti Space-Time Block Coding, in the time of specific implementation, in original stream, only the power of this symbol need be become half of other symbol.And, launch the repetition of this symbol with half of checking symbol power at another minute afflux of STTD coding, further, also comprise the Reduplicated process of delaying time, to reach the effect of Alamouti Space-Time Block Coding.

Such as, 128 information symbol S ₁, S ₂..., S ₁₂₈With 256 checking symbol T ₁, T ₂..., T ₂₅₆, information symbol is always used P/6 power, and checking symbol P/3 power always, and the process of each OFDM symbol that is mapped to each stream is as follows:

Stream one

$\left[\begin{array}{cccccccccccccccc}{S}_1& \·\·\·& & & & & & & & & & & & & & \\ S_2& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_7& \·\·\·& & & & & & & & & & & & & & \\ S_8& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_{13}& \·\·\·& & & & & & & & & & & & & & \\ S_{14}& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \end{array}\right]$

Stream two

$\left[\begin{array}{cccccccccccccccc}*& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_3& \·\·\·& & & & & & & & & & & & & & \\ S_4& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_9& \·\·\·& & & & & & & & & & & & & & \\ S_{10}& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_{15}& \·\·\·& & & & & & & & & & & & & & \\ S_{16}& \·\·\·& & & & & & & & & & & & & & \end{array}\right]$

Stream three

$\left[\begin{array}{cccccccccccccccc}*& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_5& \·\·\·& & & & & & & & & & & & & & \\ S_6& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ S_{11}& \·\·\·& & & & & & & & & & & & & & \\ S12& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \\ *& \·\·\·& & & & & & & & & & & & & & \end{array}\right]$

Here 16 subcarriers of 1 OFDM symbol of 16 line displays of matrix, and each OFDM symbol is shown in each tabulation of matrix.Here only provided the structure of first OFDM symbol, the method for other OFDM symbol construction is similar.* the time-frequency piece of checking symbol is inserted in expression.

And flow 4 must be

$\left[\begin{array}{cccccccccccccccc}{S}_2^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_1^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_4^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_3^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_6^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_5^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_8^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_7^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_{10}^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_9^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_{12}^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_{11}^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_{14}^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_{13}^{*}& \·\·\·& & & & & & & & & & & & & & \\ S_{16}^{*}& \·\·\·& & & & & & & & & & & & & & \\ {-S}_{15}^{*}& \·\·\·& & & & & & & & & & & & & & \end{array}\right]$

If adopt the existing scheme emission in 802.11, so 4 above-mentioned flow points are not delivered to each transmitting antenna and get final product, deliver to transmitting antenna 1,2,3,4 respectively such as stream 1,2,3,4.In this scheme, stream 4 is always used the half-power transmit information symbols, and it is little to cause flowing other stream of 4 power ratio.

And if adopt the solution of the present invention, then 4 streams can change in the different Almouti Space-Time Block Coding cycles with the corresponding relation of 4 transmitting antennas.For example, in the time interval of first OFDM symbol, at the 1st, 2 OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,2,3,4 respectively; At the 3rd, 4 OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,4,3,2 respectively; At the 5th, 6 OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,4,2,3 respectively; ....By such mode, at each symbol period of a TTI, the emitting antenna combination of emission Almouti Space-Time Block Coding travels through more combination, preferably travels through all possible combination.Adopt each stream and the corresponding relation of each transmitting antenna scheme, can also guarantee that the power of each transmitting antenna is equal as far as possible in different Almouti Space-Time Block Coding cycle variations.

Be with SFBC (Space Frequency Block Coding, space-time/frequency block code) above.Promptly in the scheme of adjacent one group of Alamouti Space-Time Block Coding of two sub-carrier transmit.Also can use STBC (SpaceTime Block Coding, Space-Time Block Coding), promptly launch one group of Alamouti Space-Time Block Coding at two adjacent OFDM symbols, following (only provided the structure of first and second OFDM symbol here, the method for other OFDM symbol construction is similar.)：

Stream one

$\left[\begin{array}{cccccccccccccccc}{S}_1& S_2& \·\·\·& & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_7& S_8& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{13}& S_{14}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{19}& S_{20}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{25}& S_{26}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{31}& S_{32}& & & & & & & & & & & & & & \end{array}\right]$

Stream two

$\left[\begin{array}{cccccccccccccccc}*& *& \·\·\·& & & & & & & & & & & & & \\ S_3& S_4& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_9& S_{10}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{15}& S_{16}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{21}& S_{22}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{27}& S_{28}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \end{array}\right]$

Stream three

$\left[\begin{array}{cccccccccccccccc}*& *& \·\·\·& & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_5& S_6& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{11}& S_{12}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{17}& S_{18}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{23}& S_{24}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \\ S_{29}& S_{30}& & & & & & & & & & & & & & \\ *& *& & & & & & & & & & & & & & \end{array}\right]$

Stream 4 (all being half of result of the Alamouti coding of information symbol)

$\left[\begin{array}{cccccccccccccccc}{S}_2^{*}& -S_1^{*}& \·\·\·& & & & & & & & & & & & & \\ S_4^{*}& -S_3^{*}& & & & & & & & & & & & & & \\ S_6^{*}& -S_5^{*}& & & & & & & & & & & & & & \\ S_8^{*}& -S_7^{*}& & & & & & & & & & & & & & \\ S_{10}^{*}& -S_9^{*}& & & & & & & & & & & & & & \\ S_{12}^{*}& {-S}_{11}^{*}& & & & & & & & & & & & & & \\ S_{14}^{*}& -S_{13}^{*}& & & & & & & & & & & & & & \\ S_{16}^{*}& -S_{15}^{*}& & & & & & & & & & & & & & \\ S_{18}^{*}& -S_{17}^{*}& & & & & & & & & & & & & & \\ S_{20}^{*}& -S_{19}^{*}& & & & & & & & & & & & & & \\ S_{22}^{*}& -S_{21}^{*}& & & & & & & & & & & & & & \\ S_{24}^{*}& -S_{23}^{*}& & & & & & & & & & & & & & \\ S_{26}^{*}& -S_{25}^{*}& & & & & & & & & & & & & & \\ S_{28}^{*}& -S_{27}^{*}& & & & & & & & & & & & & & \\ S_{30}^{*}& -S_{29}^{*}& & & & & & & & & & & & & & \\ S_{32}^{*}& -S_{31}^{*}& & & & & & & & & & & & & & \end{array}\right]$

4 above-mentioned streams can be launched with existing scheme in 802.11 or the solution of the present invention, and use the existing scheme better effects if in 802.11, and the gain that diversity reached of the used emitting antenna combination of further Alamouti Space-Time Block Coding is arranged.

If adopt the existing scheme emission in 802.11, so 4 above-mentioned flow points are not delivered to each transmitting antenna and get final product, deliver to transmitting antenna 1,2,3,4 respectively such as stream 1,2,3,4.In this scheme, stream 4 is always used the half-power transmit information symbols, and it is little to cause flowing other stream of 4 power ratio.

And if adopt the solution of the present invention, then 4 streams can change in the different Almouti Space-Time Block Coding cycles with the corresponding relation of 4 transmitting antennas.For example, in the time interval of first and second OFDM symbol, at first OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,2,3,4 respectively; At second OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,4,3,2 respectively; At the 3rd OFDM subcarrier, stream 1,2,3,4 is delivered to transmitting antenna 1,4,2,3 respectively; ....By such mode, at each symbol period of a TTI, the emitting antenna combination of emission Almouti Space-Time Block Coding travels through more combination, preferably travels through all possible combination.Adopt each stream and the corresponding relation of each transmitting antenna scheme, can also guarantee that the power of each transmitting antenna is equal as far as possible in different Almouti Space-Time Block Coding cycle variations.

In addition, the space diversity coded system in the above embodiments is not defined as yet and adopts the Alamouti Space-Time Block Coding, can also be to adopt time delay diversity CSD method coding.If transmitting terminal has M=5 transmitting antenna, and using 3 transmission antennas transmit after one tunnel signal encoding, can also use time delay deversity scheme and Space-Time Block Coding coding so simultaneously, the specific coding method as previously mentioned.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (32)

1, a kind of method of emission signal in multi antenna communication is characterized in that, comprising:

A, described mimo system transmitting terminal have M transmitting antenna, and emission K road transmits;

B, transmitting terminal adopt K transmission antennas transmit to transmit by the described K of the parallel simultaneously emission of spatial reuse road at each symbol period of described TTI, and use one or more transmission antennas transmit signal in M-K transmitting antenna of residue simultaneously.

2, the method for claim 1 is characterized in that, described method is used for the single codeword pattern of multi-antenna communication.May further comprise the steps in the steps A:

Receiving terminal uses information to described transmitting terminal feedback transmitting antenna, indicates some TTI can be by the spatial reuse number K that transmits of each road of difference of parallel emission simultaneously.

3, the method for claim 1 is characterized in that, described method is used for the single codeword pattern of multi-antenna communication.

4, the method for claim 1 is characterized in that, among the described step B, uses one or more transmission antennas transmit signal in M-K transmitting antenna of residue, is to use sky time-code coded system to obtain diversity gain.

5, the method for claim 1 is characterized in that, among the described step B, uses one or more transmission antennas transmit signal in M-K transmitting antenna of residue, and the coded system of using the time delay deversity scheme is to obtain space diversity gain.

6, the method for claim 1, it is characterized in that, among the described step B, using one or more transmission antennas transmit signal in M-K transmitting antenna of residue, is to use the coded system of time delay deversity scheme and Space-Time Block Coding to obtain space diversity gain simultaneously.

7, method as claimed in claim 4 is characterized in that, among the described step B, uses one or more transmitting antenna in M-K transmitting antenna of residue to transmit, and the empty time-code of described use is a Space-Time Block Coding.

8, the method for claim 1 is characterized in that, described M=2, K=1, among the described step B, adopt following pattern to transmit:

$A_1^{\′}=\left[\begin{array}{cc}{s}_i& s_{i+1}\\ -s_{i+1}^{*}& s_i^{*}\end{array}\right],$

S wherein _iBe symbolic vector in transmission antennas transmit, S _i ^*Be symbolic vector S _iConjugation, i is a positive integer.

9, the method for claim 1 is characterized in that, described M=4, K=1, among the described step B, adopt following pattern to transmit:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& 0& 0\\ -s_{i+1}^{*}& s_i^{*}& 0& 0\\ 0& 0& s_{i+2}& s_{i+3}\\ 0& 0& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& 0& 0& s_{i+5}\\ -s_{i+5}^{*}& 0& 0& s_{i+4}^{*}\\ 0& s_{i+6}& s_{i+7}& 0\\ 0& -s_{i-7}^{*}& s_{i+6}^{*}& 0\\ 0& s_{i+8}& 0& s_{i+9}\\ 0& -s_{i+9}^{*}& 0& s_{i+8}^{*}\\ s_{i+10}& 0& s_{i+11}& 0\\ {-s}_{i+11}^{*}& 0& s_{i+10}^{*}& 0\end{array}\right],$

S wherein _iBe symbolic vector in transmission antennas transmit, S _i ^*Be symbolic vector S _iConjugation, i is a positive integer.

10, the method for claim 1 is characterized in that, described M=4, K=1, among the described step B, adopt following pattern to transmit:

$X_4^{R=1}=\left[\begin{array}{cccc}{x}_1& x_2& x_3& x_4\\ -x_2^{*}& x_1^{*}& -x_4^{*}& x_3^{*}\\ -x_3^{*}& -x_4^{*}& x_1^{*}& x_2^{*}\\ x_4& -x_3& -x_2& x_1\end{array}\right]$

X wherein _iBe the symbolic vector of transmission antennas transmit, x ^*The conjugation of expression symbolic vector x, i is a positive integer.

11, the method for claim 1 is characterized in that, described M=4, K=1, among the described step B, adopt following pattern to transmit:

$X_4^{R=3/4}=\left[\begin{array}{cccc}{x}_1& -x_2^{*}& \frac{x_3^{*}}{\sqrt{2}}& \frac{x_3^{*}}{\sqrt{2}}\\ x_2& x_1^{*}& \frac{x_3^{*}}{\sqrt{2}}& -\frac{x_3^{*}}{\sqrt{2}}\\ \frac{x_3}{\sqrt{2}}& \frac{x_3}{\sqrt{2}}& \frac{-x_1-x_1^{*}+x_2-x_2^{*}}{2}& \frac{x_2+x_2^{*}+x_1-x_1^{*}}{2}\\ \frac{x_3}{\sqrt{2}}& -\frac{x_3}{\sqrt{2}}& \frac{-x_2-x_2^{*}+x_1-x_1^{*}}{2}& -\frac{x_1+x_1^{*}+x_2-x_2^{*}}{2}\end{array}\right]$

X wherein _iBe the symbolic vector of transmission antennas transmit, x ^*The conjugation of expression symbolic vector x, i is a positive integer.

12, the method for claim 1 is characterized in that, described M=4, K=2, among the described step B, adopt following pattern to transmit:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& s_{i+2}& s_{i+3}\\ -s_{i+1}^{*}& s_i^{*}& -s_{i+3}^{*}& s_{i+2}^{*}\\ s_{i+4}& s_{i+5}& s_{i+6}& s_{i+7}\\ -s_{i+6}^{*}& -s_{i+7}^{*}& s_{i+4}^{*}& s_{i+5}^{*}\\ s_{i+8}& s_{i+9}& s_{i+10}& s_{i+11}\\ -s_{i+11}^{*}& -s_{i+10}^{*}& s_{i+9}^{*}& s_{i+8}^{*}\end{array}\right],$

S wherein _iBe symbolic vector in transmission antennas transmit, S _i ^*Be symbolic vector S _iConjugation, i is a positive integer.

13, the method for claim 1 is characterized in that, described M=4, K=3, among the described step B, adopt following pattern to transmit:

$\left[\begin{array}{cccc}{s}_i& s_{i+1}& t_i& t_{i+1}\\ -s_{i+1}^{*}& s_i^{*}& t_{i+2}& t_{i+3}\\ s_{i+2}& t_{i+4}& s_{i+3}& t_{i+5}\\ -s_{i+3}^{*}& t_{i+6}& s_{i+2}^{*}& t_{i+7}\\ s_{i+4}& t_{i+8}& t_{i+9}& s_{i+5}\\ -s_{i+5}^{*}& t_{i+10}& t_{i+11}& s_{i+4}^{*}\\ t_{i+12}& s_{i+7}& s_{i+6}& t_{i+13}\\ t_{i+14}& s_{i+6}^{*}& -s_{i+7}^{*}& t_{i+15}\\ t_{i+16}& t_{i+17}& s_{i+8}& s_{i+9}\\ t_{i+18}& t_{i+19}& -s_{i+9}^{*}& s_{i+8}^{*}\\ t_{i+20}& s_{i+10}& t_{i+21}& s_{i+11}\\ t_{i+22}& -s_{i+11}^{*}& t_{i+23}& s_{i+10}^{*}\end{array}\right],$

S wherein _iBe symbolic vector in transmission antennas transmit, S _i ^*Be symbolic vector S _iConjugation, t _iBe the symbolic vector in transmission antennas transmit, i is a positive integer.

14, the method for claim 1 is characterized in that, described transmitting antenna can be the physical transmit antenna, also can be virtual transmitting antenna.

15, the method for claim 1 is characterized in that, described transmitting used the coded system of Alamouti Space-Time Block Coding.

16, the system that the single codeword pattern transmits in a kind of multi-antenna communication comprises and the transmitting terminal of M transmitting antenna adopts wherein K transmission antennas transmit signal, and described K＜M is characterized in that, comprising:

The feedback information receiving element is used to obtain receiving terminal and uses information to transmitting terminal feedback transmitting antenna, according to described feedback information, confirms that some TTI can be by the spatial reuse number K that transmits of each road of difference of parallel emission simultaneously;

Transmitting is provided with the unit, is used for according to described K, in M-K transmitting antenna of residue one or more is set does the sky time-code and transmit, and obtains diversity gain.

17, system as claimed in claim 16 is characterized in that, described transmitting antenna is physical transmit antenna or virtual transmitting antenna.

18, a kind of method of mixed automatic retransmission request process of the many code words communication plan that is used for mimo system is characterized in that, may further comprise the steps:

A. described mimo system transmitting terminal has M transmitting antenna, by K transmission antennas transmit K circuit-switched data stream wherein;

Chnnel coding is independently carried out on each road of described K circuit-switched data stream respectively; When the q time re-transmission of HARQ, if the N in the signal of K road _DecThe road signal is correctly decoded, and when the q+1 time re-transmission of HARQ, transmitting terminal only sends the K-N that also is not correctly decoded so _DecThe redundant information of road signal;

If N B. _DecMore than or equal to 1, so before launched N _DecThe N that the road signal is used _DecOne or more transmitting antenna in the individual transmitting antenna also is used for transmitting.

19, method as claimed in claim 18 is characterized in that, among the described step B, uses residue N _DecOne or more transmission antennas transmit signal in the individual transmitting antenna is to use sky time-code coded system to obtain space diversity gain.

20, method as claimed in claim 18 is characterized in that, among the described step B, uses residue N _DecOne or more transmission antennas transmit signal in the individual transmitting antenna, the coded system that is to use time delay deversity scheme CSD is to obtain space diversity gain.

21, method as claimed in claim 18 is characterized in that, among the described step B, uses residue N _DecOne or more transmission antennas transmit signal in the individual transmitting antenna is to use the coded system of time delay deversity scheme CSD and Space-Time Block Coding to obtain space diversity gain simultaneously.

22, method as claimed in claim 19 is characterized in that, among the described step B, uses one or more transmitting antenna in M-K transmitting antenna of residue to transmit, and the empty time-code of described use is a Space-Time Block Coding.

23, a kind of method of emission signal in multi antenna communication is characterized in that, comprising:

A, described mimo system transmitting terminal have M transmitting antenna, and emission K road transmits;

B, K are less than M, and at least two transmission antennas transmit are adopted, to obtain space diversity gain at least one road during the K road transmits behind the coding.In a TTI, at least one road signal of at least two transmission antennas transmit is adopted in described coding back, and the combination and variation of employed at least two transmitting antennas at least once.

24, method as claimed in claim 23 is characterized in that, among the described step B, at least one road signal of at least two transmission antennas transmit is adopted in the coding back, is to use sky time-code coded system to obtain diversity gain; Or the coded system of use time delay deversity scheme is to obtain space diversity gain; Or the coded system of using time delay deversity scheme and Space-Time Block Coding simultaneously is to obtain space diversity gain.

25, method as claimed in claim 23 is characterized in that, described M=4, and described K=3 among the described step B, adopts two transmission antennas transmit, to obtain space diversity gain after one tunnel signal encoding.In a TTI, the combination and variation of employed two transmitting antennas of this road signal at least once.

26, method as claimed in claim 25, it is characterized in that one road signal of two transmission antennas transmit, the combination of employed two transmitting antennas are adopted in described coding back, the all possible combination of traversal in a TTI, and the number of times that each combination is used is equal as far as possible.

27, method as claimed in claim 23, it is characterized in that, among the described step B, at least one road signal of at least two transmission antennas transmit is adopted in the coding back, the combination of employed at least two transmitting antennas, the all possible combination of traversal in a TTI, and the number of times that each combination is used is equal as far as possible.

28, a kind of method of emission signal in multi antenna communication has M transmitting antenna at transmitting terminal, it is characterized in that, comprising:

A, need information transmitted through a Turbo encoder encodes after, obtain comprising that the coding result of information bit and check bit, described coding result are divided into the emission of K road, wherein K is less than M;

At least one road during B, K road transmit, at least two transmission antennas transmit are adopted in the coding back, to obtain space diversity gain;

C, adopt at least one road signal of at least two transmission antennas transmit, distribute more information bit in described coding back.

29, method as claimed in claim 28 is characterized in that, among the described step B, at least one road signal of at least two transmission antennas transmit is adopted in the coding back, is to use sky time-code coded system to obtain diversity gain; Or the coded system of use time delay deversity scheme is to obtain space diversity gain; Or the coded system of using time delay deversity scheme and Space-Time Block Coding simultaneously is to obtain space diversity gain.

30, method as claimed in claim 28 is characterized in that, M=4, and K=3 among the described step B, adopts two transmission antennas transmit, to obtain space diversity gain after one tunnel signal encoding.

31, method as claimed in claim 30 is characterized in that, among the described step C, adopts on one road signal of two transmission antennas transmit in described coding back, distributes information bit as much as possible.

32, method as claimed in claim 28 is characterized in that, among the described step C, adopts at least one road signal of at least two transmission antennas transmit in described coding back, distributes information bit as much as possible.

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