CN101459459A - Transmission method, system and apparatus for MIMO signal - Google Patents

Abstract

The embodiment of the invention discloses a transmission method of multi-input and multi-output signals, which comprises the following steps that: receiving the channel feedback information fed by a receiver through a channel feedback signaling by a transmitter, existing only one digit difference between the channel feedback signaling of two transmitting matrixes in the same transmitting matrix group, sending each group of generalized space time block codes STBC by the transmitting matrix in the transmitting matrix group through using the same antenna combination, and selecting the transmitting matrix by the transmitter according to the channel feedback signaling. The probability of generating feedback errors between the transmitting matrix groups is not larger than the probability of generating feedback errors inside the transmitting matrix groups through using the embodiment of the invention, when the transmitter selects the transmitting matrix according to the channel feedback signaling generated by the receiver, which increases the performances of the system, and improves the order of ergodic transmitting matrixes of the transmitter, thereby reaching well diversity gain.

Description

A kind of launching technique of MIMO signal, system and device

Technical field

The present invention relates to communication technical field, particularly a kind of launching technique of MIMO signal, system and device.

Background technology

In the wireless channel environment of mobile communication system since such as multipath interference, shade, waveform attenuating, the time become factor noise and the decline, send signal and can incur loss inevitably.This loss of signal meeting causes the serious distortion that sends signal, reduces the performance of whole system.In wireless communication system, alleviate multipath fading by diversity technique.This diversity technique is divided into time diversity, frequency diversity and antenna diversity.Antenna diversity is the more diversity form of using in the mobile communication, briefly, adopts a plurality of reception antennas to come received signal exactly, merges then.The antenna diversity pattern is divided into the reception antenna diversity of using a plurality of reception antennas, use the transmitting antenna diversity of a plurality of transmitting antennas and multiple-input and multiple-output MIMO (Multiple Input Multiple Output, the multiple-input and multiple-output) antenna diversity of a plurality of transmitting antennas of use and a plurality of reception antennas.MIMO sends with predetermined coding method encoded signals, time domain coding is expanded to the special circumstances of the Space Time Coding (STC, Space Time Coding) in spatial domain by a plurality of transmitting antennas, and its purpose is to improve message transmission rate or bit error rate.

Space-Time Block Coding (STBC, Space Time Block Coding) is a kind of space time coding scheme, and STBC utilizes the space diversity of signal, makes mimo system can obtain bigger channel capacity and signal gain.The Space-Time Block Coding of Alamouti pattern is a simple and classical example of Space-Time Block Coding.In Alamouti Space-Time Block Coding technology, transmitter uses two or more transmission antennas transmit signal simultaneously, can use one or more reception antenna received signals at receiver.When transmitter uses two or more transmitting antennas simultaneously, for receiver, can obtain the diversity gain of these two transmitting antennas.

The emission matrix of Alamouti Space-Time Block Coding (STBC) can be expressed as:

Emission matrix I: $\left[\begin{array}{cc}{a}_1& -a_2^{*}\\ a_2& a_1^{*}\end{array}\right]$

Wherein, the row of this emission matrix is represented antenna 1 and antenna 2 respectively, and row are represented symbol period 1 and symbol period 2 respectively.The situation that above-mentioned symbol period 1 and symbol period 2 satisfy channel in these two symbol periods changes can be regarded as approximate constantly more slowly, and these two symbol periods are normally adjacent on frequency domain or time domain.These two symbol periods are under situation adjacent on the time domain, are considered to the Alamouti Space-Time Block Coding (STBC) of narrow sense usually; And work as these two symbol periods is under situation adjacent on the frequency domain, is commonly referred to as Alamouti SFBC (Space Frequency Block Coding, space-time/frequency block code).In embodiments of the present invention, the Space-Time Block Coding that is called of the Space-Time Block Coding of narrow sense and space-time/frequency block code unification; That is to say that, Space-Time Block Coding can refer to the Space-Time Block Coding of narrow sense, also can refer to space-time/frequency block code herein, based on context concrete implication can be determined.

Wherein, a symbol period refers to 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 DraftAir 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 total 8x16=128 the symbol period of this packet.

As previously mentioned, a kind of emission matrix I of Alamouti Space-Time Block Coding is as the formula (1):

Emission matrix I: $\left[\begin{array}{cc}{a}_1& -a_2^{*}\\ a_2& a_1^{*}\end{array}\right]---\left(1\right)$

Above-mentioned emission matrix I can use the method for algebraically to change its expression way, and not change its essence.For example, make b ₁=a ₁, b ₂=-a ₂ ^*, so above-mentioned emission matrix I as shown in Equation (2):

Emission matrix I: $\left[\begin{array}{cc}{b}_1& b_2\\ {-b}_2^{*}& b_1^{*}\end{array}\right]---\left(2\right)$

The essence of emission matrix I is: antenna 1 is the relation of conjugation each other between the symbol that symbol period 2 is launched at the symbol of symbol period 1 emission and antenna 2; Antenna 2 is to get the relation of bearing and getting conjugation each other between the symbol of symbol period 2 emissions at the symbol and the antenna 1 of symbol period 1 emission.

The another kind of emission matrix of Alamouti Space-Time Block Coding is as shown in Equation (3):

Emission matrix II: $\left[\begin{array}{cc}{a}_1& a_2^{*}\\ a_2& {-a}_1^{*}\end{array}\right]---\left(3\right)$

I is similar with emission matrix, and above-mentioned emission matrix II also can use algebraic method to change its expression way, and not change its essence.For example, make b ₁=-a ₁ ^*, b ₂=a ₂, so above-mentioned emission matrix II as shown in Equation (4):

Emission matrix II: $\left[\begin{array}{cc}{-b}_1^{*}& b_2^{*}\\ b_2& b_1\end{array}\right]---\left(4\right)$

The essence of emission matrix II is: antenna 1 is to get the relation of bearing and getting conjugation each other between the symbol of symbol period 2 emissions at the symbol and the antenna 2 of symbol period 1 emission; Antenna 2 is the relation of conjugation each other between the symbol that symbol period 2 is launched at the symbol of symbol period 1 emission and antenna 1.

In like manner, can also use algebraic method, emission matrix I and emission matrix II be changed over other expression way, but can not change its essence.

The substantive difference of emission matrix I and emission matrix II is, antenna 1 among the emission matrix I is relations of conjugation each other at the symbol of symbol period 1 emission and antenna 2 at the symbol of symbol period 2 emissions, then is to get the relation of bearing and getting conjugation each other in emission matrix II; Antenna 2 among the emission matrix I is to get the relation of bearing and getting conjugation each other at the symbol of symbol period 1 emission with the relation of antenna 1 between the symbol of symbol period 2 emissions, then is the relation of conjugation each other in emission matrix II.Use emission matrix I or emission matrix II, with regard to the receptivity of independent Alamouti Space-Time Block Coding, the two is as broad as long.

In a kind of MIMO communication system scheme of using Space-Time Block Coding, transmitter has 4 transmitting antennas, and receiver has at least two reception antennas.4 transmitting antennas of transmitter are divided into two groups, one group of Alamouti Space-Time Block Coding of two transmission antennas transmit of every group, the spatial multiplexing mode of V-BLAST when being equivalent to adopt vertical bell laboratories layered space (Vertical-Bell Laboratories Layered Space Time) is launched two groups of Alamouti Space-Time Block Codings simultaneously.Symbol before supposing to encode is used s respectively ₁, s ₂, s ₃, s ₄, s ₅, s ₆, s ₇, s ₈Expression then through the signal matrix behind the Space-Time Block Coding coding of Alamouti pattern is:

$B=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\\ s_3& {-s}_4^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]---\left(5\right)$

In this matrix, transmitting antenna of each line display, promptly the 1st, 2,3,4 row are represented transmitting antenna 1,2,3,4 respectively; And a symbol period is shown in each tabulation of matrix, and promptly the 1st, 2,3,4 row are represented symbol period 1,2,3,4 respectively.The situation that symbol period 1,2 satisfies channel in these 2 symbol periods changes can be regarded as approximate constantly more slowly, and these 2 symbol periods are normally adjacent on frequency domain or time domain; The situation that symbol period 3,4 also satisfies channel in these 2 symbol periods changes can be regarded as approximate constantly more slowly, and these 2 symbol periods are normally adjacent on frequency domain or time domain.General, at symbol period 1,2, in 3,4 these 4 symbol periods, the situation of channel changes also slow usually.

For 4 transmitting antennas, can produce displacement patterns by the antenna circulation in the following manner.4 * 4 matrixes as the formula (1), by line by line the displacement obtain 4! It is possible planting displacement patterns.Yet it is effectively that 6 kinds of displacement patternses are only arranged under the characteristic below, the index of the numeral row matrix in the bracket, for example, the displacement of [4321] expression first row and fourth line exchange, second row and the third line exchange.

Characteristic 1: no matter the position of STBC grouping how, the mean square deviation of the difference absolute value of receiver SINR (Signal to InterferenceNoise Ratio, Signal Interference and Noise Ratio) all equates.For example, the mean square deviation of difference absolute value that [1234] is grouped into the SINR of [(12) (34)] and [(34) (12)] equates.

Characteristic 2: even the right element position of each STBC changes, the mean square deviation of the difference absolute value of the SINR of receiver also equates.For example, the mean square deviation of difference absolute value that [1234] is grouped into the SINR of [(12) (34)] and [(21) (43)] equates.

Because above characteristic in the system that uses 4 transmitting antennas and 2 reception antennas, is effective at 6 displacement patternses shown in the table 1 (being antenna displacement patterns or antenna circulation pattern) only.

Table 1

The antenna circulation pattern
	B 1＝[(12)(34)]
B 2＝[(12)(43)]
	B 3＝[(13)(24)]
B 4＝[(13)(42)]
	B 5＝[(14)(23)]
B 6＝[(14)(32)]

The meaning of above-mentioned antenna circulation pattern is as follows: B ₁=[(12) (34)], expression is with one group of Alamouti Space-Time Block Coding of combination of antennas 12 emissions, and antenna 1 is got negative at the symbol of symbol period 2 emission, and used another group of combination of antennas 34 emissions Alamouti Space-Time Block Coding, and get negative at the symbol of symbol period 2 emissions antenna 3.B ₂=[(12) (43)], expression is with one group of Alamouti Space-Time Block Coding of combination of antennas 12 emissions, and antenna 1 is got negative at the symbol of symbol period 2 emission, and used another group of combination of antennas 34 emissions Alamouti Space-Time Block Coding, and get negative at the symbol of symbol period 2 emissions antenna 4.The combination of antennas of above-mentioned two antennas of use is sent out one group of Alamouti Space-Time Block Coding, and some antennas are wherein got negative expression at the symbol of symbol period 2 emissions, be on the basis of the expression way of the hereinafter employed Alamouti Space-Time Block Coding emission matrix of the embodiment of the invention, the expression of a feature that is embodied.And in fact, as previously mentioned, the expression way of each Alamouti Space-Time Block Coding emission matrix (being aforesaid emission matrix I and emission matrix II), can use algebraic method to change over other expression way, but can not change its essence, promptly still keeping is one that belongs among emission matrix I and the emission matrix II.

Six permutation matrixes of corresponding these six kinds of antenna circulation patterns are that emission matrix is as follows:

$B_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\\ s_3& {-s}_4^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$ $B_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_7& -s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_6& {-s}_8^{*}\end{array}\right]$ $B_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_6& {-s}_8^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$

$B_4=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_7& {-s}_5^{*}\\ s_3& {-s}_4^{*}& s_6& -s_8^{*}\end{array}\right]$ $B_5=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_6& {-s}_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\end{array}\right]$ $B_6=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_6& {-s}_8^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\end{array}\right]$

(6)

In the prior art of certain standard, receiving terminal is selected in six above-mentioned emission matrix according to current channel situation, adopts the channel feedback signaling then, and the sequence number of selected emission matrix is fed back to transmitting terminal.Transmitting terminal is selected a corresponding emission matrix according to the channel feedback signaling that receives, and transmits to receiving terminal.

For these 6 emission matrix, B as can be seen ₁And B ₂Unique difference be: use one group of Alamouti Space-Time Block Coding difference of 34 of identical combination of antennas, B ₁Antenna 3 is got at the symbol of symbol period 2 emission negative, and B ₂Get negative to antenna 4 at the symbol of symbol period 2 emissions.Therefore, adopt emission matrix B ₁And B ₂The mode difference that two groups of Alamouti Space-Time Block Codings of emission interfere with each other, under the situation of the interference of considering other one group of Alamouti Space-Time Block Coding, when receiver adopted Minimum Mean Square Error receiver or ZF receiver, the reception SINR of each group Alamouti Space-Time Block Coding was different.If adopt interference cancellation techniques to eliminate but the interference of using one group of Alamouti Space-Time Block Coding of same antenna combination has been received machine, so for B ₁And B ₂, the reception SINR of remaining one group of Alamouti Space-Time Block Coding is identical.Same, for aforesaid B ₃And B ₄Between, and B ₅And B ₆Between, also satisfy above-mentioned principle, so 6 matrixes can be divided into three groups, be about to B ₁And B ₂Be divided into one group, B ₃And B ₄Be divided into one group, B ₅And B ₆Be divided into one group.This also is equivalent to 6 kinds of antenna circulation patterns in the table 1 are made corresponding grouping, i.e. B ₁=[(12) (34)] and B ₂=[(12) (43)] are divided into one group, B ₃=[(13) (24)] and B ₄=[(13) (42)] are divided into one group, and B ₅=[(14) (23)] and B ₆=[(14) (32)] are divided into one group.

In addition, we can verify by emulation, same group B ₁And B ₂V-BLAST optimal detection order always identical, if i.e. B ₁Be higher detection, the then B earlier of needing of reception SINR of combination of antennas 34 ₂The higher elder generation that needs of reception SINR that also must be combination of antennas 43 is detected; And if B ₁Be higher detection, the then B earlier of needing of reception SINR of combination of antennas 12 ₂The higher elder generation that needs of reception SINR that also must be combination of antennas 12 is detected.From the above mentioned, these 6 emission matrix, two groups of used emitting antenna combination of Alamouti Space-Time Block Coding that two groups of used emitting antenna combination of Alamouti Space-Time Block Coding that the 3rd, 4 liang of tabulation shown and the 1st, 2 liang of tabulation are shown are identical.So, in fact only need write out preceding two of each matrix and be listed as the full detail that can express each emission matrix, as the formula (7):

$B_1=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_2& s_1^{*}\\ s_3& -s_4^{*}\\ s_4& s_3^{*}\end{array}\right]$ $B_2=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_2& s_1^{*}\\ s_4& s_3^{*}\\ s_3& {-s}_4^{*}\end{array}\right]$ $B_3=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_3& {-s}_4^{*}\\ s_2& s_1^{*}\\ s_4& s_3^{*}\end{array}\right]$ $B_4=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_4& s_3^{*}\\ s_2& {-s}_1^{*}\\ s_3& -s_4^{*}\end{array}\right]$

$B_5=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_3& -s_4^{*}\\ s_4& s_3^{*}\\ s_2& s_1^{*}\end{array}\right]$ $B_6=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_4& s_3^{*}\\ s_3& {-s}_4^{*}\\ s_2& s_1^{*}\end{array}\right]$ (7)

Simultaneously, under the situation of the interference of considering other one group of Alamouti Space-Time Block Coding, two emission matrix of same group, for example, B ₁And B ₂The average and the variance of difference absolute value of the reception SINR of one group of Alamouti Space-Time Block Coding of emission, all less than not two emission matrix of same group, for example, B ₁And B ₃The average and the variance of the difference absolute value of the reception SINR of one group of Alamouti Space-Time Block Coding of emission.For example, emission matrix B ₁And B ₂Average and variance with the difference absolute value of the reception SINR of one group of Alamouti Space-Time Block Coding of combination of antennas 12 emission are less than emission matrix B ₁With combination of antennas 12 and emission matrix B ₃Average and variance with the difference absolute value of the reception SINR of one group of Alamouti Space-Time Block Coding of combination of antennas 13 emission.Therefore, when in the process of transmitter according to the channel feedback signaling selection emission matrix of receiver feedback feedback error taking place, if B ₁Wrong one-tenth B ₂, the loss on the statistical average meaning of bringing is less; And if B ₁Wrong one-tenth B ₃, the loss on the statistical average meaning of bringing is bigger, so in order to improve systematic function, need prevent B as far as possible ₁Wrong one-tenth B ₃And so on the emission matrix group between feedback error.

2 reception antennas of receiver adopt the V-BLAST interference cancellation receiver, promptly from two groups of Alamouti STBC that transmitter is launched, select and receive the highest one group of SINR and detected judgement, then with the result who adjudicates, in received signal, eliminate the interference of this group Alamouti STBC, detect other one group of Alamouti STBC again.Cause the error sign ratio that detects higher because if the reception SINR of one group of Alamouti STBC that first is detected is low, do interference eliminated with wrong a lot of result so, can cause very that grave error spreads, can make the poor performance of subsequent detection.Therefore, receiver selects the standard as emission matrix to be from 6 antenna displacement patternses: the reception SINR of the at first detected one group of STBC of each antenna displacement patterns relatively, select the highest one of the reception SINR of one group of at first detected STBC as emission matrix.For example, establish receiver and find antenna displacement patterns B ₁The reception SINR of combination of antennas 12 be higher than B ₁The reception SINR of combination of antennas 34, thereby first is detected, and B ₁Thereby the reception SINR of the combination of antennas 12 better reception SINR of first one group of detected Alamouti STBC of reception SINR that also is higher than other any antenna displacement patterns.Thereby receiver tells transmitter to select antenna displacement patterns B by feedback information ₁As emission matrix.

In when, in the process of transmitter according to the channel feedback signaling selection emission matrix of receiver feedback error taking place, B ₁Wrong one-tenth B ₂Loss on the statistical average meaning of bringing is greater than B ₁Wrong one-tenth B ₃Loss on the statistical average meaning of being brought.This is because B ₁And B ₂The average of difference absolute value of reception SINR of combination of antennas 12 and the less and B of variance ₁And B ₃The average and the variance of difference absolute value of reception SINR of first one group of detected Alamouti STBC bigger, thereby the loss on the statistical average meaning is bigger.

Yet in existing standard, the feedback signaling of each emission matrix is as shown in table 2:

Table 2

Emission matrix	The channel feedback signaling of correspondence in the existing standard
		B 1	0b110001
B 2	0b110010
		B 3	0b110011

B 4	0b110100
		B 5	0b110101
B 6	0b110110

Above-mentioned channel feedback signaling is to launch behind the Direct-Spread, has certain error probability, and the probability of only wrong 1 bit is far longer than the probability of wrong 2 or 2 above bits.Represent in the mode that at present feedback signaling the feedback signaling of organizing interior two emission matrix correspondences all has 2 to 3 difference usually, probability wrong in the group is less; And the feedback signaling of two emission matrix correspondences all has only 1 difference usually between group, and probability wrong between group is bigger.

Therefore,, accurately select the high emission matrix of SINR, need prevent B as much as possible in order to improve the performance of system ₁Wrong one-tenth B ₃And so on group between feedback error.

For 4 transmitting antennas of transmitter, under the situation of no channel feedback signaling, at each symbol period that packet is shared, each permutation matrix in the use formula (8) is as emission matrix in turn.

$C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$ $C_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$ $C_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$

$C_4=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& -s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$ $C_5=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\end{array}\right]$ $C_6=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\end{array}\right]$

(8)

Emission matrix C ₁Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 12,34 each spontaneous emission respectively, use combination of antennas 13,24 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

Emission matrix C ₂Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 12,43 each spontaneous emission respectively, use combination of antennas 14,23 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

Emission matrix C ₃Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 13,24 each spontaneous emission respectively, use combination of antennas 12,34 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

Emission matrix C ₄Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 13,42 each spontaneous emission respectively, use combination of antennas 14,32 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

Emission matrix C ₅Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 14,23 each spontaneous emission respectively, use combination of antennas 12,43 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

Emission matrix C ₆Be to use one group of Alamouti Space-Time Block Coding of combination of antennas 14,32 each spontaneous emission respectively, use combination of antennas 13,42 each spontaneous one group of Alamouti Space-Time Block Coding respectively at two symbol periods thereafter at two symbol periods of beginning.

These 6 emission matrix are actually the traversal of the 6 kinds of displacement patternses (12) (34) shown in the table 1, (12) (43), (13) (24), (13) (42), (14) (23), (14) (32).In OFDM (Orthogonal Frequency Division Multiple, the OFDM) system of certain communication standard regulation, aforesaid each emission matrix, for example: $C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_7& s_5^{*}\\ s_3& {-s}_4^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$ Be to take 4 symbol periods like this:

	Subcarrier 1	Subcarrier 2
			The 1st OFDM symbol	The 1st row of emission matrix	The 3rd row of emission matrix
The 2nd OFDM symbol	The 2nd row of emission matrix	The 4th row of emission matrix

As above shown in the table, 4 row of emission matrix, two adjacent OFDM symbols on the holding time territory respectively, i.e. the 1st OFDM symbol and the 2nd OFDM symbol, and adjacent two subcarriers on the frequency domain, i.e. subcarrier 1 and subcarrier 2.Concrete, first row and the secondary series of matrix all takies subcarrier 1, and lays respectively at first OFDM symbol and second OFDM symbol; And the 3rd row of matrix and the 4th row all take subcarrier two, and lay respectively at first OFDM symbol and second OFDM symbol.Here, the 1st row and the 2nd row of emission matrix take same subcarrier, and are positioned at different OFDM symbols, have used the Space-Time Block Coding of narrow sense.In the above-mentioned realization, each emission matrix takies two subcarriers, can come characteristic ground to determine the pattern that each emission matrix recycles according to the index of subcarrier, as the formula (9):

C _k：k＝mod(floor(N _C-1)/2)+1 (9)

N wherein _CThe index of presentation logic data subcarrier, and N _C=1,2,3 ..., N}.As the formula (9), N _C=1 and 2, then k=1, i.e. emission matrix C ₁Be used for subcarrier 1 and subcarrier 2, can calculate C equally ₂Be used for subcarrier 3 and subcarrier 4, C ₃Be used for subcarrier 5 and subcarrier 6; As seen, per two subcarriers use an emission matrix.And each emission matrix takies two subcarriers, and adjacent two OFDM symbols on the holding time territory.In this standard, also stipulated to skip the subcarrier that can not be used for transfer of data, this subcarrier that can not be used for transfer of data refers generally to be used to launch the subcarrier of pilot signal by certain antenna, attention: when certain subcarrier is used to launch pilot signal by any one antenna, then other antenna can not be used for transfer of data to this subcarrier, promptly can transmitted data symbols not be subjected to the interference of the data symbol of piece emission frequently at the same time of other antenna to guarantee above-mentioned antenna pilot transmitted signal on this subcarrier.Relevant is illustrated as follows:

	Subcarrier 1	Subcarrier 2	Subcarrier 3
				The 1st OFDM symbol	The 1st row of emission matrix	The subcarrier that can not be used for transfer of data	The 3rd row of emission matrix
The 2nd OFDM symbol	The 2nd row of emission matrix	The subcarrier that can not be used for transfer of data	The 4th row of emission matrix

As above shown in the table, because subcarrier 2 can not be used for transfer of data, so can think that subcarrier 1 and subcarrier 3 are continuous sub-carriers, though they are also discontinuous on frequency domain, but because so discontinuous can't avoiding, so can ignore discontinuous on the frequency domain that causes by such reason.All embodiment of this paper observe this above-mentioned principle, hereinafter just repeat no more.

Certainly, each emission matrix takies the mode of 4 symbol periods, and other form also can be arranged, for example:

	Subcarrier 1	Subcarrier 2
			The 1st OFDM symbol	The 1st row of emission matrix	The 2nd row of emission matrix
The 2nd OFDM symbol	The 3rd row of emission matrix	The 4th row of emission matrix

Here, the 1st row and the 2nd row of emission matrix take same OFDM symbol, and are positioned at different subcarriers, have used space-time/frequency block code.Each emission matrix takies the mode of 4 symbol periods, can also be

	Subcarrier 1	Subcarrier 2
			The 1st OFDM symbol	The 1st row of emission matrix
The 2nd OFDM symbol	The 2nd row of emission matrix
			The 3rd OFDM symbol		The 3rd row of emission matrix
The 4th OFDM symbol		The 4th row of emission matrix

Perhaps

	Subcarrier 1	Subcarrier 2	Subcarrier 3	Subcarrier 4
					The 1st OFDM symbol	The 1st row of emission matrix	The 2nd row of emission matrix
The 2nd OFDM symbol			The 3rd row of emission matrix	The 4th row of emission matrix

When from C ₁To C ₆After having traveled through once, be equivalent to by 6 kinds of displacement patternses shown in the following order traversal list 1: (12) (34), (13) (24), (12) (43), (14) (23), (13) (24), (12) (34), (13) (42), (14) (32), (14) (23), (12) (43), (14) (32), (13) (42).Traversal can not reach best diversity gain in this order.

In addition, two-way STBC can use the mode of SCW (SingleCodeword, single codeword) to realize by the concurrent prior art of spatial reuse.The single codeword technology can be used for two-way STBC by the concurrent prior art of spatial reuse, also can be used in the technology of a plurality of transmitting antennas by the concurrent multiplex data stream of spatial reuse, briefly introduce below at a plurality of transmitting antennas and pass through to use the scheme of single codeword technology in the scene of the concurrent multiplex data stream of spatial reuse.

For single codeword, data flow to be sent is at first passed through operations such as chnnel coding, channel interleaving, rate-matched and planisphere mapping, launches (number that M is transmitting antenna) through different antennas respectively for the data flow of M road phase same rate along separate routes then.Receiving terminal calculates the average SINR of all channels, looks into MCS (The modulation and channel coding scheme, modulation and channel coding schemes) the average MCS of concordance list feedback.At transmitting terminal, as shown in Figure 1, data flow to be launched adopts unified channel encoder, RM (Rate Matching, rate-matched) mode and modulation system, then all data is distributed to each antenna, launches after handling accordingly.According to the difference of the multi-access mode that system adopted, channel code or channel resources such as frequency or time that the data occupancy of this M transmitting antenna is identical.

As shown in Figure 1, channel coding module 102 is the Turbo code of 1/5 code check.Channel interleaving module 104 comprises two submodules, is respectively bit separation and bit permutation.Rate-matched module 106 is punched the sequence length of bringing as required or is repeated.Splitter 108 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 110 comprises two submodules, be respectively planisphere mapping block 110a and channelizing processing module 110b, wherein, the planisphere mapping comprises BPSK (BinaryPhase Shift Keying, biphase phase shift keying), QPSK (Quadrature Phase Shift Keying, quaternary PSK), 8PSK (8Phase Shift Keying, eight phase phase-shift keyings), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), modulation systems such as 64QAM, channelizing is handled and is comprised OFDM or spread spectrum etc., and a plurality of transmitter modules, can be antenna.

And when the single codeword technology is used for two-way STBC by the concurrent prior art of spatial reuse, the scheme that adopts is as follows: data flow to be sent is at first passed through operations such as chnnel coding, channel interleaving, rate-matched and planisphere mapping, is that the data flow of 2 tunnel phase same rates is launched through different Space-Time Block Codings respectively then along separate routes.At transmitting terminal, data flow to be launched adopts unified channel encoder, RM mode and modulation system, all data is distributed to respectively organizes Space-Time Block Coding then, launches after handling accordingly.According to the difference of the multi-access mode that system adopted, channel code or channel resources such as frequency or time that the data occupancy of this M transmitting antenna is identical.

Prior art also provides a kind of method that transmitted bit distributes in the SCW system, and its basic thought is to place information bit as much as possible on the best one or more transmitter modules of performance.This is because in encoding and decoding, information bit is (if constellation mapping is before splitter then be information symbol, for simplicity, all use information bit) importance be greater than check bit, be to occur error code on the information bit Effect on Performance is greater than check bit error code occurs to Effect on Performance, go up transmission so information bit is placed on one or more transmitter modules (referring generally to antenna) of performance best (SINR is big) as far as possible, transmit and check bit is placed on the transmitter module of remaining poor-performing.

In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:

When transmitter was selected emission matrix by the channel feedback signaling, the probability that feedback error takes place between the emission matrix group was bigger, and the loss on the statistical average meaning is bigger.And when using each emission matrix in turn, the traversal order of prior art can not reach best diversity gain.

Summary of the invention

The problem that the embodiment of the invention will solve provides a kind of launching technique, system and device of MIMO signal, when selecting emission matrix according to receiver by the channel feedback information of channel feedback signaling feedback with the realization transmitter, at the probability of the probability that feedback error takes place between the emission matrix group less than generation feedback error within the emission matrix group, reduce the loss on the statistical average meaning, and improve existing traversal order, to reach better diversity gain.

For achieving the above object, the embodiment of the invention proposes a kind of launching technique of MIMO signal on the one hand, may further comprise the steps: transmitter receives the channel feedback information of receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of broad sense Space-Time Block Coding STBC; Described transmitter is selected emission matrix according to described channel feedback signaling.

On the other hand, the embodiment of the invention also proposes a kind of emission system of MIMO signal, comprise: receiver, be used for according to current channel situation calculating channel feedback information, and feed back described channel feedback information by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC; Transmitter is used for selecting emission matrix according to the channel feedback information of described receiver feedback.

On the one hand, the embodiment of the invention also proposes a kind of receiver, comprising: the information calculations module is used for according to current channel situation the calculating channel feedback information again; The signaling feedback module, be connected with described information calculations module, be used for the channel feedback information that described information calculations module obtains is fed back to transmitter by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC.

Again on the one hand, the embodiment of the invention also proposes a kind of transmitter, comprise: the feedback signaling receiver module, be used to receive the channel feedback information of receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC; Emission matrix is selected module, is connected with described feedback signaling receiver module, and the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected emission matrix.

On the one hand, the embodiment of the invention also proposes a kind of launching technique of MIMO signal, may further comprise the steps again: transmitter receives the channel feedback information of receiver by channel feedback signaling feedback; Described transmitter is selected the emission matrix group according to described channel feedback signaling, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

Again on the one hand, the embodiment of the invention also proposes a kind of emission system of MIMO signal, comprising: receiver, be used for according to current channel situation, and the calculating channel feedback information, and feed back described channel feedback information by the channel feedback signaling; Transmitter is used for selecting the emission matrix group according to the channel feedback signaling of described receiver feedback, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

On the one hand, the embodiment of the invention also proposes a kind of receiver, comprising: the information calculations module is used for according to current channel situation the calculating channel feedback information again; The signaling feedback module is connected with described information calculations module, is used for the channel feedback information that described information calculations module obtains is fed back to transmitter by the channel feedback signaling.

On the one hand, the embodiment of the invention also proposes a kind of transmitter, comprising again: the feedback signaling receiver module is used to receive the channel feedback information of receiver by channel feedback signaling feedback; Matrix group is selected module, be connected with described feedback signaling receiver module, the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected the emission matrix group, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

Again on the one hand, the embodiment of the invention also proposes a kind of launching technique of MIMO signal, may further comprise the steps: transmitter travels through all emission matrix, and all emission matrix of every traversal once travels through all displacement patternses once or twice; Described transmitter uses described emission matrix that symbol mapped is arrived transmitting antenna in turn.

Compared with prior art, the embodiment of the invention has the following advantages: pass through the embodiment of the invention, improve the design of channel feedback signaling, the feasible channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, thereby reduced when transmitter is selected emission matrix according to this channel feedback signaling, the probability of feedback error taking place between the emission matrix group, and improved the order of transmitter traversal emission matrix, thereby has reached better diversity gain.

Description of drawings

Fig. 1 adopts the structure chart of the transmitter of single codeword technology for prior art;

Fig. 2 is the flow chart of the embodiment of the invention one;

Fig. 3 is the structure chart of the embodiment of the invention two;

Fig. 4 is the flow chart of the embodiment of the invention three;

Fig. 5 is the structure chart of the embodiment of the invention four.

Embodiment

The embodiment of the invention provides a kind of launching technique of MIMO signal, system and device, pass through the embodiment of the invention, the emission matrix that transmitter will use identical combination of antennas to send same set of symbols is divided into an emission matrix group, channel feedback signaling according to the receiver feedback is selected emission matrix, the channel feedback signaling that belongs to two emission matrix of different emission matrix groups has the difference than multidigit as far as possible, and the channel feedback signaling that belongs to two emission matrix of same emission matrix group only needs the difference of less bits, the channel feedback signaling that for example belongs to two emission matrix of different emission matrix groups has two or more than two difference as far as possible, and the channel feedback signaling that belongs to two emission matrix of same emission matrix group only needs one difference.Like this, in the scene that feedback is made mistakes, the loss that causes is less.The scene that this feedback is made mistakes is meant: when this transmitter is selected emission matrix according to this channel feedback signaling, when transmitter is made mistakes to the reception court verdict of this channel feedback signaling, transmitter has been selected an emission matrix according to the reception court verdict of mistake, but this emission matrix is not selected that emission matrix of channel feedback signaling of receiver.

As previously mentioned, the channel feedback signaling is to launch behind the Direct-Spread, has certain error probability, and the probability of only wrong 1 bit is far longer than the probability of wrong 2 or 2 above bits.In embodiments of the present invention, the channel feedback signaling that belongs to two emission matrix of different emission matrix groups has two or more than two difference as far as possible, thereby assurance belongs to the channel feedback signaling of two emission matrix of same emission matrix group has only one difference, so feedback is when makeing mistakes, the optimum emission matrix that the emission matrix of transmitter wrong choice and receiver are selected is not more than the probability of the optimum emission matrix of the emission matrix of transmitter wrong choice and receiver selection in same emission matrix group at the probability of same emission matrix group.This has just reduced the probability that feedback error takes place between the emission matrix group, has improved the performance of system.

The multi-input multi-output system of mentioning in the embodiment of the invention, receiver can use the reception antenna received signal that is no less than two, and transmitter can use four or more transmitting antenna simultaneously.But in the description of embodiment of the invention embodiment, will and use the receiver of at least 2 reception antennas the embodiment of the invention to be described with the transmitter that uses 4 transmitting antennas as example.In addition, the code element of mentioning in the embodiment of the invention can be the code element behind any Space Time Coding STC coding, but in the description of embodiment of the invention embodiment, will be that example is described the embodiment of the invention with the code element behind the Space-Time Block Coding coding of Alamouti pattern.Be that the embodiment of the invention will be described as the embodiment of example to the embodiment of the invention with the MIMO communication system of mentioning in the background technology of using Space-Time Block Coding.

The transmitting antenna of mentioning in the embodiment of the invention can be a physical antenna, also can be virtual-antenna.The virtual-antenna technology provides a plurality of virtual-antenna ports, s emission signal s ₁, s ₂..., s _MAfter delivering to each virtual-antenna port respectively, emission signal vector be multiply by a matrix T and a matrix U obtains result vector successively $\widetilde{\stackrel{\→}{s}}=U\·T\·\stackrel{\→}{s}$ everyly deliver to the emission of each physical antenna port more respectively.In this case, expression a plurality of transmit and a plurality of received signal between the equivalent channel matrix of relation be $\tilde{H}=H\·U\·T$ 。At this moment, received signal vector is $\stackrel{\→}{x}=H\·U\·T\·\stackrel{\→}{s}+\stackrel{\→}{w}=\tilde{H}\stackrel{\→}{s}+\stackrel{\→}{w}$ 。Received signal vector when therefore, utilizing the virtual-antenna technology and the pass between the emission signal vector are $\stackrel{\→}{x}=\tilde{H}\stackrel{\→}{s}+\stackrel{\→}{w},$ And received signal vector under the individual situation of directly delivering to M physical antenna emission that transmits of M and the relation between the emission signal vector $\stackrel{\→}{x}=H\stackrel{\→}{s}+\stackrel{\→}{w}$ Has identical form.Wherein, matrix T and matrix U to emission signal vector is taken advantage of successively can be orthogonal matrix, also can be nonopiate matrix.So said virtual-antenna in the embodiment of the invention, after being meant that emission signal vector obtains a result vector with a matrix or an above matrix multiple earlier, launch the every of this result vector respectively by each transmitting antenna again, the matrix of being taken advantage of, can be orthogonal matrix, also can be non-orthogonal matrix.

For the single codeword mode, receiver can be simple linear receiver, such as well-known MMSE (Minimum Mean Square Error, least mean-square error) during equalizer (equalizer) empty or emptyly realize frequently, it 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, aforesaid V-BLAST interference cancellation receiver is the most frequently used a kind of.

Common MIMO interference cancellation receiver, i.e. V-BLAST receiver all selects one to receive the best transmitting antenna of SINR and detect at every turn, the interference of eliminating this transmitting antenna then and being transmitted; In each transmitting antenna to be detected of remainder, select one to receive the best transmitting antenna of SINR and detect, the interference of eliminating this transmitting antenna then and being transmitted; Such process circulation is carried out, and is all detected up to transmitting of all transmitting antennas.

The performance of BLAST receiver can be subjected to the influence of the effect of error diffusion: when detecting the signal of at first detected antenna emission, if the estimated value mistake that obtains, use wrong estimated value during then owing to interference eliminated, the diffusion that then can make the mistake, the performance when detecting the signal of other antenna emission can descend greatly.If give the at first detected more power of antenna assignment, probability of errors will reduce when detecting the signal of this antenna emission so, thereby reduce the adverse effect of error diffusion, simultaneously, the power of distributing to other antenna can not be very little, if very little, though the influence of error diffusion is well reduced during interference eliminated, but because the power of other antenna thereby to receive SNIR very little too little, receptivity also can be poor.

Use at receiving terminal under the situation of non-linear receiver of interference cancellation techniques, thereby can be better at first detected to the received signal to noise ratio which transmitting antenna transmitting terminal feeds back by receiving terminal, need to use corresponding bit number feedback corresponding information, transmitting terminal can be given the more transmitting power of this antenna assignment then, detects wrong probability to reduce it.The received signal to noise ratio of above-mentioned which transmitting antenna is better, is meant at the hypothesis receiving terminal to adopt under the situation of linear receiver, and the received signal to noise ratio of each transmitting antenna of comparison of equivalence, the received signal to noise ratio of finding out which transmitting antenna is better.

At the different emission signal to noise ratio (power of the signal that transmitting antenna is launched, with transmit arrive the ratio of the noise power that increases again behind the reception antenna through channel) and the statistical property of mimo channel, the gain of the method for above-mentioned power division is different, under different emission signal to noise ratios, perhaps under different mimo channel statistical properties, the optimum power distribution method changes little, in fact use certain fixing power distribution method, under each different emission signal to noise ratio, gain still clearly.After obtaining the method for power division, transmitting terminal is selected the corresponding power allocation scheme according to current emission signal to noise ratio.

For the SCW system of 2 transmitting antennas, 2 reception antennas, thereby the received signal to noise ratio that only needs 1 bit of use to feed back which transmitting antenna is better at first detected.Then, transmitting terminal can be placed on this antenna to information bit as much as possible, and gives the more power of this antenna assignment.

For the SCW system of 4 transmitting antennas, 4 reception antennas, need to use 2 bit feedback corresponding informations, thereby promptly which transmitting antenna has best received signal to noise ratio first is detected.Transmitting terminal is given the more power of this antenna assignment then, can also further be placed on this antenna to information bit as far as possible.

In addition, thereby it is better at first detected to the received signal to noise ratio which transmitting antenna transmitting terminal feeds back that above-mentioned scheme is a receiving terminal, transmitting terminal is given the more transmitting power of this antenna assignment then, and the method for power division is changeless in continuous a plurality of frames.Further, can adopt the feedback of more bits, select different power distribution methods, promptly remain at the more power of received signal to noise ratio transmitting antenna distribution preferably, and concrete power division, transmitting terminal and receiving terminal are appointed several quantized values, by the selected suitable quantized value of receiving terminal, feed back to transmitting terminal, transmitting terminal is according to the feedback information of receiving then, at the more power of received signal to noise ratio transmitting antenna distribution preferably, also information bit as much as possible is placed on this antenna simultaneously; And the value of concrete power division, also determine according to the feedback of receiving terminal.

In order to reduce feedback quantity, also can be according to the characteristics that method is constant at continuous a plurality of frame internal fixation or variation is very little of power division, power distribution method is a plurality of TTI (Transmission TimeInterval, Transmission Time Interval) at interval, and promptly at interval a plurality of frames just by the receiving terminal feedback once.

Here introduce the notion of above-mentioned TTI.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.Above-mentioned technical scheme also can be promoted and is used for two-way STBC by the concurrent prior art of spatial reuse.Embodiment is described below:

In the prior art, receiving terminal is selected 6 emission matrix B that mention in the prior art according to current channel situation ₁, B ₂, B ₃... B ₆In one, adopt the channel feedback signaling then, the sequence number of selected emission matrix is fed back to transmitting terminal.Transmitting terminal is selected a corresponding emission matrix according to the channel feedback signaling that receives, and transmits to receiving terminal.

Now, receiving terminal is according to current channel situation, from these 6 emission matrix B ₁, B ₂, B ₃... B ₆In select one as emission matrix, again the sequence number of selected emission matrix is fed back to transmitting terminal, and judge that according to current channel situation which group among two groups of Alamouti STBC has received signal to noise ratio preferably, again the sequence number of this group Alamouti STBC is fed back to transmitting terminal.

Transmitting terminal receives after the feedback signal of receiving terminal, uses an emission matrix of selection that receiving terminal feeds back to transmit; In addition, transmitting terminal distributes more transmitting power to one group of Alamouti STBC with better received signal to noise ratio of receiving terminal feedback; Perhaps transmitting terminal has information bit as much as possible the Alamouti STBC emission of better received signal to noise ratio with this group; General, in order to obtain gain as much as possible, at one group of Alamouti STBC with better received signal to noise ratio of receiving terminal feedback, transmitting terminal distributes more transmitting power, and distributes information bit as much as possible.

And the method for power division can immobilize, and perhaps power distribution method is at each TTI, promptly each frame all once by the receiving terminal feedback, perhaps power distribution method a plurality of TTI at interval, promptly at interval a plurality of frames just by the receiving terminal feedback once.

As shown in Figure 2, the flow chart for the embodiment of the invention one specifically may further comprise the steps:

Step S201, transmitter receives the channel feedback information of receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in this emission matrix group uses identical combination of antennas to send every group of Generalized S TBC.Table 1 in the reference background technology, 6 emission matrix B that mention in embodiments of the present invention ₁～B ₆, B ₁And B ₂, B ₃And B ₄, B ₅And B ₆Use identical combination of antennas to send same group of broad sense Space-Time Block Coding respectively, therefore can be with B ₁And B ₂Be divided into one group, B ₃And B ₄Be divided into one group, B ₅And B ₆Be divided into one group, the emission matrix in each emission matrix group uses identical combination of antennas to send every group of broad sense Space-Time Block Coding like this.

The channel feedback signaling is a kind of signaling format, and after design of communication system person provided, transmitter and receiver was observed this channel feedback signaling jointly.With B ₁And B ₂, B ₃And B ₄, B ₅And B ₆Be classified as respectively after one group, in the channel feedback signaling of these 6 effective emission matrix of existing standard, the channel feedback signaling of organizing interior two emission matrix correspondences all has 2 to 3 difference usually, and the probability that feedback error takes place in the emission matrix group is less; And the channel feedback signaling that belongs to two emission matrix correspondences of different emission matrix groups all has only 1 difference usually, and the probability that feedback error takes place between the emission matrix group is bigger.Therefore, in embodiments of the present invention, improve the design of channel feedback signaling, make the channel feedback signaling of two emission matrix correspondences belonging to different emission matrix groups have as far as possible and be no less than 2 difference, to reduce between the emission matrix group, to take place the probability of feedback error; And the channel feedback signaling that belongs to two emission matrix correspondences of same emission matrix group has only 1 difference, because the loss that the generation feedback error causes within the emission matrix group is less, so earlier difference is had only 1 feedback signaling to lose little place as far as possible to using.Transmitter is after the channel feedback signaling that receives the receiver feedback, select corresponding emission matrix according to this channel feedback signaling, selecting in the process of emission matrix according to the channel feedback signaling of receiver feedback, be not more than the probability that feedback error takes place within the emission matrix group at the probability that feedback error takes place between the emission matrix group.After choosing emission matrix, code element transmitter is encoded two-way through the Alamouti Space-Time Block Coding after is mapped to each corresponding transmitting antenna by the emission matrix of choosing, and by each transmitting antenna this two-way Alamouti Space-Time Block Coding is launched.

Wherein, the channel feedback signaling of being arranged in the communication system, make the channel feedback signaling of two emission matrix belonging to different emission matrix groups have two or more than two difference as far as possible, for this reason, assurance belongs to the channel feedback signaling of two emission matrix of same emission matrix group and has only one difference, with by increase the probability that feedback error takes place within the emission matrix group, reduce between the emission matrix group, to take place the probability of feedback error.This is because after employed feedback signaling was fixing, total feedback error probability was fixed, and the probability that equals to take place within the emission matrix group feedback error adds the probability that feedback error takes place between the emission matrix group.For example, can be the channel feedback signalings of 6 emission matrix agreement correspondences in the table 2 by the mode shown in the table 3:

Table 3

Emission matrix	Corresponding channel feedback signaling
		B 1	001
B 2	011
		B 3	010
B 4	110

B 5	100
		B 6	101

It shown in the table 3 the feedback signaling scheme of principle, if the feedback signaling scheme of this principle is applied in the existing standard, then only need the corresponding relation of 6 feedback signalings in the his-and-hers watches 2 and 6 emission matrix to do corresponding modification and get final product, the result who obtains is as shown in table 4:

Table 4

Emission matrix	The channel feedback signaling of correspondence in the existing standard
		B 1	0b110001
B 2	0b110011
		B 3	0b110010
B 4	0b110110
		B 5	0b110100
B 6	0b110101

In table 4 and the table 2, the feedback signaling of each emission matrix correspondence has only last 3 bits inequality, and each bit of front is all identical.Each identical bit, promptly 0b110 is the form that is used for representing this feedback signaling, represents that promptly these feedback signalings are the selection information of representing these 6 emission matrix.

As previously mentioned, B ₁And B ₂, B ₃And B ₄, B ₅And B ₆Can be classified as one group respectively, after pressing the mode predetermined channel feedback signaling shown in the table 4, the channel feedback signaling of two emission matrix within the emission matrix group has only 1 difference as can be seen, the channel feedback signaling that belongs to two emission matrix of different emission matrix groups then has the difference more than two or two as far as possible, and the channel feedback signaling that belongs to two emission matrix of different emission matrix groups certainly sometimes also has only 1 difference.Get any 2 in above-mentioned 6 emission matrix, observe the difference of the channel feedback signaling of their correspondences, can see, have and get 15 kinds of compound modes of 2 in 6, the difference of the respective channels feedback signaling of every kind of selected two emission matrix of compound mode is as follows: the channel feedback signaling of organizing interior two emission matrix correspondences differs from 1,3 kinds of compound modes are arranged, be respectively: B ₁And B ₂, B ₃And B ₄, B ₅And B ₆The channel feedback signaling of two emission matrix correspondences between group, 12 kinds of compound modes with remaining are respectively: B ₁And B ₃Differ from 2, B ₁And B ₄Differ from 3, B ₁And B ₅Differ from 2, B ₁And B ₆Differ from 1, B ₂And B ₃Differ from 1, B ₂And B ₄Differ from 2, B ₂And B ₅Differ from 3, B ₂And B ₆Differ from 2, B ₃And B ₅Differ from 2, B ₃And B ₆Differ from 3, B ₄And B ₅Differ from 1, B ₄And B ₆Differ from 2.Because the probability of 1 bit-errors takes place much larger than the probability that 2 to 3 bit-errors take place in the channel feedback signaling, therefore presses the mode predetermined channel feedback signaling shown in the table 4, can be reduced in the probability that feedback error takes place between the emission matrix group greatly.

Determine at the bit number that the channel feedback signaling is used, and under the situation that the set of the feedback signaling of each emission matrix correspondence is determined, for example, determining only to use 3 bits to distinguish 6 emission matrix, and stipulated to represent that 6 feedback signalings of 6 emission matrix are respectively 001,010,011,100,101, under 110 the situation, can adjust the corresponding relation of each emission matrix and each feedback signaling, to be reduced in the probability that feedback error takes place between the emission matrix group as far as possible, but because the feedback signaling set is determined, therefore have 2 or more than other feedback signaling of 2 potential differences to being limited, so when stipulating the channel feedback signaling of each emission matrix correspondence, making the more feedback signaling of difference figure place as far as possible is not on the same group to pairing two emission matrix, making the fewer feedback signaling of some difference figure place then is not on the same group to pairing two emission matrix, makes at last that remaining to have only other feedback signaling of 1 potential difference be on the same group to pairing two emission matrix.Because the main thought of the embodiment of the invention is to make the difference of channel feedback signaling of two emission matrix that belong to different emission matrix groups big as far as possible; perhaps by improving the design of feedback signaling; be reduced in the probability that feedback error takes place between the emission matrix group as far as possible; so the variation that any channel feedback signaling that makes emission matrix achieves the above object all should fall into the protection range of the embodiment of the invention.

Step S202, transmitter is selected emission matrix according to the channel feedback signaling of receiver feedback.After the channel feedback signaling that receives the receiver feedback, transmitter is selected emission matrix according to this channel feedback signaling.Selecting according to this channel feedback signaling in the process of emission matrix, be not more than the probability that feedback error takes place within the emission matrix group at the probability that feedback error takes place between the emission matrix group.With the channel feedback signaling shown in the table 4 is example, and when the channel feedback signaling that receives was 0b110100, transmitter was selected B ₅As emission matrix; When the channel feedback signaling that receives was 0b110101, transmitter selected B6 as emission matrix; When the channel feedback signaling that receives was 0b110001, transmitter was selected B ₁As emission matrix, by that analogy.For instance, when selecting emission matrix by this channel feedback signaling, transmitter is with B ₅The mistake B that hanks ₁Probability can be greater than with B ₅The mistake B that hanks ₆Probability, promptly the channel feedback signaling can be greater than by the wrong probability that becomes 0b110101 of 0b110100 by the probability of the wrong 0b110001 of one-tenth of 0b110100 because the difference of 0b110100 and 0b110101 has only one, and the difference of 0b110100 and 0b110001 has two.

Step S203, transmitter is mapped to transmitting antenna with code element by the emission matrix of selecting.After choosing emission matrix according to the channel feedback signaling, transmitter will be mapped to each corresponding transmitting antenna by the emission matrix of choosing through the code element behind the Space-Time Block Coding coding of Alamouti pattern, by each transmitting antenna transmission of symbols be gone out.This transmitting antenna can be a physical antenna, also can be virtual-antenna.

The signal transmitting method of above-mentioned multi-input multi-output system, be divided into one group principle according to the emission matrix that will use identical combination of antennas to send same set of symbols, improve the design of channel feedback signaling, make the difference of channel feedback signaling of two emission matrix belonging to different emission matrix groups have two as far as possible, thereby select in the process of emission matrix according to the channel feedback signaling at transmitter, reduce the probability that feedback error takes place between the emission matrix group, improved the performance of system.

As shown in Figure 3, be the structure chart of the embodiment of the invention two, embodiment two has proposed a kind of emission system of MIMO signal, comprises receiver 31 and transmitter 32.Receiver 31, be used for according to current channel situation calculating channel feedback information, and by channel feedback signaling feedback channel feedback information, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in this emission matrix group uses identical combination of antennas to send every group of Generalized S TBC; Transmitter 32 is used for selecting emission matrix according to the channel feedback information of receiver 31 feedbacks.

Wherein, receiver 31 comprises: information calculations module 311 is used for according to current channel situation the calculating channel feedback information;

Signaling feedback module 312, be connected with information calculations module 311, the channel feedback information that is used for information calculations module 311 is obtained feeds back to transmitter 32 by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in this emission matrix group uses identical combination of antennas to send every group of Generalized S TBC.

Wherein, transmitter 32 comprises: feedback signaling receiver module 321, be used to receive the channel feedback information of receiver 31 by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in this emission matrix group uses identical combination of antennas to send every group of Generalized S TBC;

Emission matrix is selected module 322, is connected with feedback signaling receiver module 321, is used for selecting emission matrix according to the channel feedback signaling that feedback signaling receiver module 321 receives.

Wherein, transmitter 32 also comprises: symbol mapped module 323, and select module 322 to be connected with emission matrix, be used for symbol mapped being arrived transmitting antenna by the emission matrix that emission matrix selects module 322 to select.

As shown in Figure 4, the flow chart for the embodiment of the invention three specifically may further comprise the steps:

Step S401, transmitter receive the channel feedback information of receiver by channel feedback signaling feedback.Design principle is: the emission matrix that will use identical combination of antennas to launch same set of symbols is divided into an emission matrix group.This code element can be the code element behind any Space Time Coding STC coding, but in embodiments of the present invention, will be that example is described with the code element behind the Space-Time Block Coding coding of Alamouti pattern.Table 1 in the reference background technology, 6 emission matrix B that mention in embodiments of the present invention ₁～B ₆, B ₁And B ₂, B ₃And B ₄, B ₅And B ₆Use identical combination of antennas to send same group of Alamouti Space-Time Block Coding respectively, therefore can be with B ₁And B ₂Be divided into one group, B ₃And B ₄Be divided into one group, B ₅And B ₆Be divided into one group.Because it is little that the emission matrix in the same emission matrix group is launched the reception SINR difference of one group of Alamouti Space-Time Block Coding, so need be by two emission matrix of channel feedback signaling differentiation at same group, receiver only need be by 1 group in 3 emission matrix groups of feedback selection, and transmitter receives the feedback information of receiver, use two current packets of emission matrix transmission in selected 1 the emission matrix group of receiving terminal in turn, to reach diversity gain.At this moment, can be by the mode predetermined channel feedback signaling shown in the table 5:

Table 5

Emission matrix	Corresponding channel feedback signaling
		B 1And B 2	01
B 3And B 4	10
		B 5And B 6	11

It shown in the table 5 the feedback signaling scheme of principle, if the feedback signaling scheme of this principle is applied in the existing standard, then only need the corresponding relation of 3 feedback signalings in the his-and-hers watches 5 and 3 emission matrix groups to do corresponding modification and get final product, the result who obtains is as shown in table 6:

Table 6

Emission matrix

Corresponding channel feedback signaling

B 1And B 2	0b11001
		B 3And B 4	0b11010
B 5And B 6	0b11011

Like this, when the channel feedback signaling that receives was 0b11001, transmitter was selected B ₁And B ₂This emission matrix group is used B in turn ₁And B ₂As emission matrix.As seen, from 6 matrixes, selecting 1 during as emission matrix, 6 matrixes need 6 different channel feedback signalings, and these 6 emission matrix are being divided into after three groups, these three groups of emission matrix only need 3 different channel feedback signalings, the bit number of present channel feedback signaling only needs 2, makes the required bit number of channel feedback signaling reduce 1.

Step S402, transmitter is selected the emission matrix group according to the channel feedback signaling, and the emission matrix in this emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.After the channel feedback signaling that receives the receiver feedback, transmitter is selected an emission matrix group according to this channel feedback signaling, uses two emission matrix in this emission matrix group in turn.With the channel feedback signaling shown in the table 6 is example, and when the channel feedback signaling that receives was 0b11001, transmitter was selected B ₁And B ₂This emission matrix group, wherein, B ₁And B ₂Use identical combination of antennas to send one group of Generalized S TBC.

Step S403, transmitter use the emission matrix in the emission matrix group that symbol mapped is arrived transmitting antenna in turn.After having selected one group of emission matrix according to the channel feedback signaling of receiver feedback, transmitter uses each emission matrix in this emission matrix group by each transmitting antenna this Alamouti Space-Time Block Coding to be launched through the symbol mapped behind the Alamouti Space-Time Block Coding coding to each corresponding transmitting antenna in turn.This transmitting antenna can be a physical antenna, also can be virtual-antenna.

The signal transmitting method of above-mentioned multi-input multi-output system, the emission matrix that transmitter will use identical combination of antennas to send same set of symbols is divided into an emission matrix group, no longer by two emission matrix of channel feedback signaling differentiation at same group, thereby make the required figure place of channel feedback signaling reduce 1, reduced required feedback quantity.Transmitter is selected one group of emission matrix according to this channel feedback signaling, uses the emission matrix in this group emission matrix that symbol mapped is arrived transmitting antenna in turn.

Among the embodiment three, 1 bit that the channel feedback signaling reduces can be used for other purposes.For example, when embodiment three is used for the single codeword coded system, following embodiment can be arranged further:

Among the embodiment three, two emission matrix in the selected emission matrix group of transmitter use identical combination of antennas to send one group of STBC, and the V-BLAST optimal detection of two emission matrix of same emission matrix group order is always identical, be in these two emission matrix, always be to use the reception SINR of one group of STBC of same antenna combined transmit higher.Therefore, 1 bit that the channel feedback signaling reduces can be used for indicating the reception SINR of the STBC which combination of antennas sent of two emission matrix of emission matrix group higher.

As previously mentioned, transmitting terminal uses two emission matrix in the corresponding emission matrix group to transmit according to the feedback of receiving terminal; In addition, transmitting terminal is according to the combination of antennas information of receiving terminal with 1 above-mentioned bit feedback, in each of two emission matrix, all one group of Alamouti STBC to the combination of antennas correspondence with better received signal to noise ratio of receiving terminal feedback distributes more transmitting power; Perhaps in each of two emission matrix, transmitting terminal all distributes information bit as much as possible to one group of Alamouti STBC of the combination of antennas correspondence with better received signal to noise ratio of receiving terminal feedback; General, in order to obtain gain as much as possible, in each of two emission matrix, transmitting terminal all distributes more transmitting power to one group of Alamouti STBC of the combination of antennas correspondence with better received signal to noise ratio of receiving terminal feedback, and distributes information bit as much as possible.

And the method for power division can immobilize, and perhaps power distribution method is at each TTI, promptly each frame all once by the receiving terminal feedback, perhaps power distribution method a plurality of TTI at interval, promptly at interval a plurality of frames just by the receiving terminal feedback once.

As shown in Figure 5, be the structure chart of the embodiment of the invention four, embodiment four has proposed a kind of emission system of MIMO signal, comprise: receiver 51, be used for according to current channel situation, the calculating channel feedback information, and by channel feedback signaling feedback channel feedback information; Transmitter 52 is used for selecting the emission matrix group according to the channel feedback signaling of receiver 51 feedbacks, and the emission matrix in this emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

Wherein, receiver 51 comprises: information calculations module 511 is used for according to current channel situation the calculating channel feedback information;

Signaling feedback module 512 is connected with information calculations module 511, and the channel feedback information that is used for information calculations module 511 is obtained feeds back to transmitter 52 by the channel feedback signaling.

Wherein, transmitter 52 comprises: feedback signaling receiver module 521 is used to receive the channel feedback information of receiver 51 by channel feedback signaling feedback;

Matrix group is selected module 522, be connected with feedback signaling receiver module 521, be used for selecting the emission matrix group according to the channel feedback signaling that feedback signaling receiver module 521 receives, the emission matrix in this emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

Wherein, transmitter 52 also comprises: symbol mapped module 523, and select module 522 to be connected with matrix group, be used for using in turn matrix group to select the emission matrix of the emission matrix group of module 522 selections that symbol mapped is arrived transmitting antenna.

The embodiment of the invention five has proposed a kind of launching technique of MIMO signal, and in embodiment five, receiver is not to transmitter feedback channel feedback signaling, and at each symbol period that packet is shared, transmitter uses emission matrix C in turn ₁To C ₃, embodiment is:

As described in the table 1 of front, 6 kinds of antenna displacement patternses can be divided into three groups, B ₁=[(12) (34)] and B ₂=[(12) (43)], B ₃=[(13) (24)] and B ₄=[(13) (42)], B ₅=[(14) (23)] and B ₆=[(14) (32)] are classified as one group respectively, can be by changing the traversal order of these 6 kinds of displacement patternses, reach better diversity gain, improved traversal order need satisfy, get 1 displacement patterns successively for every group earlier, traveled through after 3 displacement patternses of 3 groups, traveled through every group of remaining 1 displacement patterns again.For example, transmitter can be according to B ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆The order of=[(14) (32)] travels through this 6 kinds of displacement patternses successively.Similar traversal mode can have a variety of, and aforementioned is elder generation's traversal group 1 successively, group 2, the displacement patterns B in the group 3 ₁, B ₃, B ₅, traversal group 1 successively again, group 2, other 1 the displacement patterns B in the group 3 ₂, B ₄, B ₆Can certainly be earlier traversal group 1 successively, group 2, the displacement patterns B in the group 3 ₂, B ₄, B ₅, traversal group 1 successively again, group 2, other 1 the displacement patterns B in the group 3 ₁, B ₃, B ₆Much other traversal modes can also be arranged, as long as satisfy above-mentioned principle.

If each emission matrix takies two subcarriers by the mode described in the background technology, and adjacent two OFDM symbols on the holding time territory.So for according to B ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆The order of=[(14) (32)] travels through this 6 kinds of displacement patternses, i.e. traversal group 1 successively, group 2, the displacement patterns B in the group 3 ₁, B ₃, B ₅, traversal group 1 successively again, group 2, other 1 the displacement patterns B in the group 3 ₂, B ₄, B ₆Mode, can design each emission matrix as follows:

$C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& s_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& -s_6^{*}\end{array}\right]$ $C_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\end{array}\right]$ $C_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$

The launching technique of above-mentioned MIMO signal, receiver do not need to transmitter feedback channel feedback signaling, and transmitter uses emission matrix C in turn ₁To C ₃, because the embodiment of the invention only need travel through 3 emission matrix C ₁To C ₃, therefore make implementation simpler, and can reach better diversity gain.

As previously mentioned, 4 of above-mentioned each emission matrix is listed as, and takies the mode of 4 symbol periods, can be

	Subcarrier 1	Subcarrier 2
			The 1st OFDM symbol	The 1st row of emission matrix	The 3rd row of emission matrix
The 2nd OFDM symbol	The 2nd row of emission matrix	The 4th row of emission matrix

Perhaps

	Subcarrier 1	Subcarrier 2
			The 1st OFDM symbol	The 1st row of emission matrix	The 2nd row of emission matrix
The 2nd OFDM symbol	The 3rd row of emission matrix	The 4th row of emission matrix

Etc. mode.

And transmitter uses emission matrix C in turn ₁To C ₃Mode be: at time-domain or each adjacent symbol period of frequency domain, use C successively ₁To C ₃, promptly use C earlier ₁, use C in time-domain or frequency domain adjacent symbol cycle then ₂, use C in time-domain or frequency domain adjacent symbol cycle then ₃, and then at time-domain or frequency domain adjacent symbol cycle use C ₁....

The embodiment of the invention six has proposed a kind of launching technique of MIMO signal, and in embodiment six, receiver is not to transmitter feedback channel feedback signaling, and at each symbol period that packet is shared, transmitter uses emission matrix C in turn ₁To C ₆, promptly travel through 6 emission matrix, thereby travel through 6 above-mentioned displacement patternses twice (each matrix can travel through two displacement patternses), and guarantee to travel through above-mentioned 6 displacement patternses successively once earlier, and then travel through 6 above-mentioned displacement patternses successively once.And when traveling through 6 above-mentioned displacement patternses 1 time, all satisfy every group of above-mentioned elder generation to get 1 displacement patterns successively, traveled through after 3 displacement patternses of 3 groups, travel through 1 displacement patterns of every group remainder again. at every turnIn addition, travel through the order of 6 displacement patternses for the first time, the order that travels through 6 displacement patternses with the second time can be different, to reach better diversity gain.Do like this, also have a benefit to be, when traveling through 6 emission matrix repeatedly, promptly travel through corresponding 12 displacement patternses repeatedly after, when remaining symbol period is counted less than 24, thus can not travel through 6 emission matrix one time the time, when remaining symbol period number less than 24 more than or equal to 12, then can also travel through 6 above-mentioned different displacement patternses 1 time, reach better diversity gain; When remaining symbol period number less than 12 more than or equal to 6, then can also travel through each 1 displacement patterns in 3 above-mentioned different groups, reach better diversity gain; When remaining symbol period number less than 6, each displacement patterns that is traveled through also can guarantee it is to have nothing in common with each other and belong to different groups, thereby reaches better diversity gain.

Embodiment is:

Transmitter travels through 1 displacement patterns of every group at first successively, has traveled through after 3 displacement patternses of 3 groups, travels through every group of remaining 1 displacement patterns again; Then, transmitter travels through 6 displacement patternses once more again according to above-mentioned method.For example, can be with embodiment three according to B ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆The mode of the order traversal displacement patterns of=[(14) (32)] changes traversal B earlier into ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆=[(14) (32)], and then traversal B ₆=[(14) (32)], B ₄=[(13) (42)], B ₂=[(12) (43)], B ₅=[(14) (23)], B ₃=[(13) (24)], B ₁=[(12) (34)].Accordingly, can design each emission matrix as follows:

$C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$ $C_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\end{array}\right]$ $C_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$

$C_4=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\end{array}\right]$ $C_5=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$ $C_6=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$

Such embodiment can have a lot of, for example: can also construct such embodiment:

Travel through B earlier ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆=[(14) (32)], and then traversal B ₁=[(12) (34)], B ₄=[(13) (42)], B ₆=[(14) (32)], B ₂=[(12) (43)], B ₃=[(13) (24)], B ₅=[(14) (23)].Accordingly, can design each emission matrix as follows:

$C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\end{array}\right]$ $C_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& -s_8^{*}\end{array}\right]$ $C_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\end{array}\right]$

$C_4=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_2& s_1^{*}& s_8& s_6^{*}\\ s_3& {-s}_4^{*}& s_7& s_5^{*}\\ s_4& s_3^{*}& s_6& {-s}_8^{*}\end{array}\right]$ $C_5=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_4& s_3^{*}& s_7& s_5^{*}\\ s_3& {-s}_4^{*}& s_8& s_6^{*}\\ s_2& s_1^{*}& s_6& {-s}_8^{*}\end{array}\right]$ $C_6=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_5& {-s}_7^{*}\\ s_3& {-s}_4^{*}& s_6& {-s}_8^{*}\\ s_2& s_1^{*}& s_8& s_6^{*}\\ s_4& s_3^{*}& s_7& s_5^{*}\end{array}\right].$

Certainly, also can allow each displacement patterns take two subcarriers, just allow each displacement patterns on two subcarriers, repeat, be about to each displacement patterns and be extended to 1 emission matrix, obtain 6 emission matrix thus according to the mode of embodiment five.The advantage that designs such scheme is, 6 emission matrix using are identical with 6 emission matrix of embodiment five in turn, thereby when the standard of formulation, for the scheme of scheme that feedback is arranged and nothing feedback, can use 6 identical emission matrix, thereby make that the standard of formulating is simpler; And shortcoming is, the effect of diversity gain can be weaker a little.For example: according to B ₁=[(12) (34)], B ₃=[(13) (24)], B ₅=[(14) (23)], B ₂=[(12) (43)], B ₄=[(13) (42)], B ₆6 kinds of displacement patternses of order traversal of=[(14) (32)], and each displacement patterns repeats on two subcarriers, 6 emission matrix that obtain thus are:

$C_1=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\end{array}\right]$ $C_2=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\end{array}\right].$ $C_3=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\end{array}\right]$

$C_4=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\end{array}\right]$ $C_5=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\end{array}\right]$ $C_6=\left[\begin{array}{cccc}{s}_1& {-s}_2^{*}& s_1& {-s}_2^{*}\\ s_4& s_3^{*}& s_4& s_3^{*}\\ s_3& {-s}_4^{*}& s_3& {-s}_4^{*}\\ s_2& s_1^{*}& s_2& s_1^{*}\end{array}\right]$

The launching technique of above-mentioned MIMO signal, receiver do not need to transmitter feedback channel feedback signaling, and transmitter uses emission matrix C in turn ₁To C ₆, reduced the step of receiver according to current channel quality calculating channel feedback information, reduced the burden of zero defect ground to transmitter transmitting channel feedback signaling, improved the reliability of system.

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.

More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims (22)

1, a kind of launching technique of MIMO signal is characterized in that, may further comprise the steps:

Transmitter receives the channel feedback information of receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of broad sense Space-Time Block Coding STBC;

Described transmitter is selected emission matrix according to described channel feedback signaling.

2, the launching technique of MIMO signal according to claim 1, it is characterized in that, after described transmitter is selected emission matrix according to described channel feedback signaling, further comprising the steps of: described transmitter uses the emission matrix of described selection that symbol mapped is arrived transmitting antenna.

3, a kind of emission system of MIMO signal is characterized in that, comprising:

Receiver, be used for according to current channel situation calculating channel feedback information, and feed back described channel feedback information by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC;

Transmitter is used for selecting emission matrix according to the channel feedback information of described receiver feedback.

4, as the emission system of MIMO signal as described in the claim 3, it is characterized in that described receiver comprises:

The information calculations module is used for according to current channel situation the calculating channel feedback information;

The signaling feedback module, be connected with described information calculations module, be used for the channel feedback information that described information calculations module obtains is fed back to described transmitter by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC.

5, as the emission system of MIMO signal as described in the claim 3, it is characterized in that described transmitter comprises:

The feedback signaling receiver module, be used to receive the channel feedback information of described receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC;

Emission matrix is selected module, is connected with described feedback signaling receiver module, and the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected emission matrix.

6, a kind of receiver is characterized in that, comprising:

The information calculations module is used for according to current channel situation the calculating channel feedback information;

The signaling feedback module, be connected with described information calculations module, be used for the channel feedback information that described information calculations module obtains is fed back to transmitter by the channel feedback signaling, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC.

7, a kind of transmitter is characterized in that, comprising:

The feedback signaling receiver module, be used to receive the channel feedback information of receiver by channel feedback signaling feedback, the channel feedback signaling that belongs to two emission matrix of same transmit matrix group has only one difference, and the emission matrix in the described emission matrix group uses identical combination of antennas to send every group of Generalized S TBC;

Emission matrix is selected module, is connected with described feedback signaling receiver module, and the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected emission matrix.

8, as transmitter as described in the claim 7, it is characterized in that, also comprise: the symbol mapped module, select module to be connected with described emission matrix, be used for symbol mapped being arrived transmitting antenna by the emission matrix that described emission matrix selects module to select.

9, a kind of launching technique of MIMO signal is characterized in that, may further comprise the steps:

Transmitter receives the channel feedback information of receiver by channel feedback signaling feedback;

Described transmitter is selected the emission matrix group according to described channel feedback signaling, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

10, as the launching technique of MIMO signal as described in the claim 9, it is characterized in that, after described transmitter is selected the emission matrix group according to described channel feedback signaling, further comprising the steps of: described transmitter uses the emission matrix in the described emission matrix group that symbol mapped is arrived transmitting antenna in turn.

11, a kind of emission system of MIMO signal is characterized in that, comprising:

Receiver is used for according to current channel situation, the calculating channel feedback information, and feed back described channel feedback information by the channel feedback signaling;

Transmitter is used for selecting the emission matrix group according to the channel feedback signaling of described receiver feedback, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

12, as the emission system of MIMO signal as described in the claim 11, it is characterized in that described receiver comprises:

The information calculations module is used for according to current channel situation the calculating channel feedback information;

The signaling feedback module is connected with described information calculations module, is used for the channel feedback information that described information calculations module obtains is fed back to described transmitter by the channel feedback signaling.

13, as the emission system of MIMO signal as described in the claim 11, it is characterized in that described transmitter comprises:

The feedback signaling receiver module is used to receive the channel feedback information of described receiver by channel feedback signaling feedback;

Matrix group is selected module, be connected with described feedback signaling receiver module, the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected the emission matrix group, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

14, a kind of receiver is characterized in that, comprising:

The information calculations module is used for according to current channel situation the calculating channel feedback information;

The signaling feedback module is connected with described information calculations module, is used for the channel feedback information that described information calculations module obtains is fed back to transmitter by the channel feedback signaling.

15, a kind of transmitter is characterized in that, comprising:

The feedback signaling receiver module is used to receive the channel feedback information of receiver by channel feedback signaling feedback;

Matrix group is selected module, be connected with described feedback signaling receiver module, the channel feedback signaling that is used for receiving according to described feedback signaling receiver module is selected the emission matrix group, and the emission matrix in the described emission matrix group uses identical combination of antennas to send one group of Generalized S TBC.

16, as transmitter as described in the claim 15, it is characterized in that, also comprise: the symbol mapped module, select module to be connected with described matrix group, be used for using in turn described matrix group to select the emission matrix of the emission matrix group of module selection that symbol mapped is arrived transmitting antenna.

17, a kind of launching technique of MIMO signal is characterized in that, may further comprise the steps:

Transmitter travels through all emission matrix, and all emission matrix of every traversal once travels through all displacement patternses once or twice;

Described transmitter uses described emission matrix that symbol mapped is arrived transmitting antenna in turn.

18, as the launching technique of MIMO signal as described in the claim 17, it is characterized in that, described transmitter travels through all emission matrix, specifically comprises: described transmitter adjacent symbol on time or frequency domain travels through all emission matrix in the cycle.

19, as the launching technique of MIMO signal as described in the claim 17, it is characterized in that, the all emission matrix of described traversal once travels through all displacement patternses once, and specifically comprise: adjacent symbol travels through all displacement patternses once in the cycle on time or frequency domain.

20, as the launching technique of MIMO signal as described in the claim 17, it is characterized in that, the all emission matrix of described traversal once, travel through all displacement patternses twice, specifically comprise: adjacent symbol travels through all displacement patternses once in the cycle on time or frequency domain, and adjacent symbol travels through all displacement patternses once in the cycle on time or frequency domain again.

21, as the launching technique of MIMO signal as described in the claim 19, it is characterized in that, described on time or frequency domain adjacent symbol travel through all displacement patternses once in the cycle, specifically comprise: earlier traversal uses displacement patterns that the combination of antennas that has nothing in common with each other sends every group of Generalized S TBC once, travels through remaining displacement patterns more once.

As the launching technique of MIMO signal as described in the claim 21, it is characterized in that 22, described remaining displacement patterns specifically comprises the displacement patterns that uses the combination of antennas that has nothing in common with each other to send every group of Generalized S TBC.

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