CN100499396C - Communication method and system in multi-input multi-output system - Google Patents
Communication method and system in multi-input multi-output system Download PDFInfo
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- CN100499396C CN100499396C CNB2006101276476A CN200610127647A CN100499396C CN 100499396 C CN100499396 C CN 100499396C CN B2006101276476 A CNB2006101276476 A CN B2006101276476A CN 200610127647 A CN200610127647 A CN 200610127647A CN 100499396 C CN100499396 C CN 100499396C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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Abstract
The invention discloses a communication method used in a multiple-input and multiple-output system, comprising transmitting antenna combination chosen by the receiving end according to the communication channel conditions, the receiving end sending the transmitting antenna combination information chosen to the sending end and the sending end according to the transmitting antenna combination information received to send signals to the receiving end via the transmitting antenna combination chosen. The invention also discloses a communication system used in the multiple-input and multiple-output system, comprising a sending end and a receiving end. According to the invention, because the receiving end chooses the transmitting antenna that adopts the principle of channel capacity maximization and sends the transmitting antenna chosen to the sending end, the sending end sending signals to the receiving end adopting the transmitting antenna chosen can reach higher transmitting efficiency, or arrives at a lower packet error rate in the receiving end.
Description
Technical field
The present invention relates to a kind of communication technology, relate in particular to a kind of communication means and system in multi-input multi-output system.
Background technology
According to information theory, at the transmitting terminal and the receiving terminal of communication system, perhaps these two ends use multi-antenna array can improve the transmission bit rate of system greatly simultaneously.
Fig. 1 shows the wireless communication system with Space-Time framework that uses multi-antenna array at transmitting terminal and receiving terminal simultaneously.This system is also referred to as MIMO (multiple-input and multiple-output) system, and it is operated in the Rayleigh scattering environment, and each element of channel matrix can be similar to regards that statistics independently as.In system shown in Figure 1, a data sequence can be divided into M incoherent code element subsequence, and each subsequence is by an emission in M the transmitting antenna.M subsequence can be received by N reception antenna at receiving terminal after the influence of the channel that is H through a channel matrix.S emission signal s
1..., s
MCan pass through M different antenna element a-1 respectively ..., a-M emission, corresponding received signal x
1..., x
NRespectively from N different antenna element b-1 ..., b-N receives.In this communication system, it is 2 that transmission antenna unit is counted M minimum, and reception antenna unit number N minimum be M.Channel matrix H is the matrix of a N * M, and i reception antenna of element representation of the capable j of i row and j transmitting antenna are by the coupling of transmission channel in the matrix.Received signal x
1..., x
NProcessed to produce transmitting of recovering in digital signal processor
Also shown summation composition c-1 among this figure, c-2 ..., c-N, the unavoidable noise signal w that their representatives comprise
1, w
2..., w
N, these noise signals join reception antenna unit b-1 respectively, b-2 ..., in the signal that b-N receives.
In mimo system shown in Figure 1, can use single codeword (SCW:Single Code Word) pattern.Above-mentioned single codeword pattern is submitted in the motion of LTE in IEEE 802.20 standards and certain company, and introduction is all arranged.Under the single codeword pattern, transmitting terminal uses M virtual-antenna port to transmit to receiving terminal, described M more than or equal to 2 smaller or equal to 4.On a plurality of virtual transmitting antennas, the data flow behind each moment transmission of one line coding after a plurality of symbol strings in this data flow and the conversion, is assigned on each virtual transmitting antenna again and is launched.At each TTI, receiving terminal only feeds back a CQI information and an ACK/NACK information, wherein CQI information is told The data which type of MCS (The modulation and channel coding scheme: modulation and channel coding schemes) of transmitting terminal behind corresponding TTI transmission of one line coding, and ACK/NACK information tells whether the data of transmitting terminal behind corresponding TTI transmission of one line coding have been received proper really decoding.
At above-mentioned send mode, receiver can be simple linear receiver, during such as known MMSE (least mean-square error) equalizer (equalizer) empty or emptyly realize frequently, also can be the receiver that the complicated data to the space multi-way transmission are carried out non-linear joint demodulation, such as the non-linear receiver that adopts interference cancellation techniques.
In IEEE 802.20 standards in the SCW pattern of defined, dimension (Rank) K that the receiving terminal feedback space is multiplexing, transmitting terminal is according to this dimension K, and each in a TTI must use K in all available M transmitting antennas to carry out the space multi-way transmission constantly; Transmitting terminal each moment in a TTI is used alternatingly all M transmitting antenna, promptly uses each transmitting antenna in turn, rather than only uses M middle fixed K individual.Such as transmitting terminal 4 transmitting antennas 1,2,3,4 are arranged, if when signal is launched, determine to use wherein 2 transmitting antennas, then each all uses 2 transmitting antennas constantly, but being to use which 2 transmitting antenna, is time dependent, and several moment are used transmitting antenna 1,2, several moment are used transmitting antenna 3,4, several moment are used transmitting antenna 2,3..., and the employed transmitting antenna of alternate (has C here up to all possible combination of traversal so successively
4 2Antenna 12 is promptly used in=6 kinds of combinations, antenna 34, antenna 13, antenna 24, antenna 14, antenna 23.
Receiving terminal to transmitting terminal FEEDBACK CONTROL word CQICHSCW, is launched several signals to control the used MCS of transmitting terminal and to walk abreast by CQICHSCW (single codeword pattern (SCW) channel quality indication (CQI:ChannelQuality Indicator :)) channel.This control word comprises 10 bits altogether, and wherein: the FormatType territory accounts for 1 bit, and the CQIValueSCW territory accounts for 5 bits, and the Rank territory accounts for 2 bits, and Reserved (promptly do not keep and use) territory accounts for 2 bits.
Further introduce above-mentioned control word CQICHSCW below.Described CQIValueSCW is used for notifying transmitting terminal to adopt which type of MCS (modulation and channel coding schemes), described Rank is used to notify the transmitting antenna of transmitting terminal to use information, indicate some TTI (transmission time slot) by can walk abreast the simultaneously number K that transmits of each road of emission of spatial reuse, described K is smaller or equal to M.Transmitting terminal obtains after the K, adopts K transmitting antenna to transmit by the parallel described K of emission of spatial reuse road constantly in each of described TTI; And in several symbol periods of a TTI, from M transmitting antenna, select K transmitting antenna, use selected K transmission antennas transmit signal, follow several other symbol periods at this TTI, from M transmitting antenna, select an other K transmitting antenna again, use selected other K transmission antennas transmit signal, until having adopted all C
M KIndividual emitting antenna combination transmits, and described G
M KPromptly from M antenna, get K antenna, all possible number of combinations.
Here introduce the notion of above-mentioned TTI and symbol period.In order to resist channel fading, and the error of transmission that brings of the interference of channel and noise, transmitting terminal is divided into a plurality of packets (Block) to the data of needs transmission, information bit in the same packet is carried out chnnel coding and interweaves, be modulated into a plurality of symbols again by Channel Transmission, and the length of transmitting so needed time of packet has determined the length of a TTI.Receiving terminal receives all symbols that comprise in the same packet earlier, carries out deinterleaving and decoding again.In presents, a TTI just is meant the time interval of the such packet of transmission.
And each symbol in the packet that is transmitted in TTI can be distributed in different interval on the time domain, perhaps is distributed in different interval on the frequency domain, perhaps is distributed in the different intervals on the two dimensional surface of time domain and frequency domain.A symbol period as herein described just is meant an interval that symbol takies by Channel Transmission, the interval that perhaps takies, the perhaps interval that takies on the two dimensional surface of time domain and frequency domain on frequency domain on time domain.For example, the document of IEEE 802.20 standard 2006-01-06 " MBFDD and MBTDD:Proposed Draft Air Interface Specification " in the described MIMO ofdm communication scheme, packet uses 8 OFDM symbols on the time domain, each OFDM symbol takies 16 subcarriers on the frequency domain, symbol period so, just be meant an interval on the two dimensional surface of time domain and frequency domain, 1 subcarrier on 1 OFDM symbol on the time domain just, and this packet has 8 an x 16=128 symbol period.
Like this, because M transmitting antenna institute respective channels situation is different, in a TTI, the channel situation of the transmitting antenna correspondence that has in M transmitting antenna is relatively good, thereby the received signal to noise ratio at receiving terminal is relatively good, and the channel situation of the transmitting antenna correspondence that has is poor, thereby poor at the received signal to noise ratio of receiving terminal.Therefore, in a TTI, use all C that get K transmitting antenna in M the transmitting antenna
M KIndividual emitting antenna combination transmits, and can not make full use of the more excellent emitting antenna combination of channel situation, to reach higher efficiency of transmission, perhaps reaches lower Packet Error Ratio at receiving terminal.
Summary of the invention
The purpose of this invention is to provide a kind of communication means and system in multi-input multi-output system.Can make transmitting terminal use optimum emitting antenna combination to transmit,,, perhaps reach lower Packet Error Ratio at receiving terminal to reach higher transmission rates from making full use of the good transmitting antenna of channel situation to receiving terminal.
The invention discloses a kind of communication means in multi-input multi-output system, comprising:
Receiving terminal is selected emitting antenna combination according to channel situation;
Receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting;
Transmitting terminal uses the emitting antenna combination of selecting to transmit to receiving terminal according to the emitting antenna combination information of selecting.
Described receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting and specifically comprised: receiving terminal in the emitting antenna combination information field, and is issued transmitting terminal with the emitting antenna combination information field with the emitting antenna combination information setting selected.
Described emitting antenna combination information field is in order to RANK bit field and reservation bit territory in the indication of displacement single codeword mode channel quality.
Each bit corresponds respectively to each transmitting antenna of transmitting terminal in the described emitting antenna combination information field.
Transmitting terminal determines whether to select corresponding each transmitting antenna according to the value of each bit in the described emitting antenna combination information field.
Described selection emitting antenna combination specifically comprises: select emitting antenna combination according to the maximized principle of transfer rate.
Described receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting and specifically comprised: receiving terminal is issued transmitting terminal by single codeword mode channel quality indicator channel with the emitting antenna combination information field.
The invention also discloses a kind of communication system in multi-input multi-output system, comprising:
Transmitting terminal, the emitting antenna combination that is used to use receiving terminal to select transmits to receiving terminal;
Receiving terminal is used for selecting emitting antenna combination according to channel situation, and gives transmitting terminal with the emitting antenna combination feedback information of selecting, so that transmitting terminal adopts the emitting antenna combination of selecting to transmit to transmitting terminal.
Described receiving terminal comprises:
Receiving element is used to receive the transmitting of each transmitting antenna of transmitting terminal;
Selected cell is selected emitting antenna combination according to channel situation;
The unit is set, and in the emitting antenna combination information field, each bit corresponds respectively to each transmitting antenna of transmitting terminal in the wherein said emitting antenna combination information field with the emitting antenna combination information setting selected;
Transmitting element is used for the emitting antenna combination information field is issued transmitting terminal.
Described transmitting terminal comprises:
Receiving element, be used to receive the emitting antenna combination information of the selection of receiving terminal feedback, wherein, the emitting antenna combination information setting is in the emitting antenna combination information field, and each bit corresponds respectively to each transmitting antenna of transmitting terminal in the described emitting antenna combination information field;
Determining unit is determined emitting antenna combination according to the transmitting antenna information of receiving terminal feedback;
Transmitter unit, the emitting antenna combination that is used to adopt determining unit to determine transmits to receiving terminal.
Therefore, according to the present invention, owing to adopt the channel capacity maximization principle to select transmitting antenna at receiving terminal, and the transmitting antenna of selecting issued transmitting terminal, so, transmitting terminal adopts selected transmitting antenna to transmit to receiving terminal can reach higher efficiency of transmission, perhaps reaches lower Packet Error Ratio at receiving terminal.
Description of drawings
Fig. 1 shows the schematic diagram of mimo wireless communication system;
Fig. 2 shows communication flow diagram of the present invention;
Fig. 3 shows communication system schematic diagram of the present invention.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
Basic thought of the present invention is, utilize the CQICHSCW channel to transmitting terminal feedback emitting antenna combination information at receiving terminal, like this, transmitting terminal uses the emitting antenna combination of feedback to transmit to receiving terminal, can make full use of the good transmitting antenna of channel situation, to reach higher transmission rates, perhaps reach lower Packet Error Ratio at receiving terminal.
The invention provides a kind of communication means in multi-input multi-output system, describe communication means of the present invention in detail below with reference to Fig. 2.
Received signal to noise ratio value and selection emitting antenna combination that step 2, receiving terminal obtain each transmitting antenna according to transmitting of each transmitting antenna.Receiving terminal is selected emitting antenna combination according to the transfer rate maximization principle, promptly uses which transmitting antenna.More specifically, receiving terminal selects to use the bigger several transmitting antennas of received signal to noise ratio value.
Step 3, receiving terminal obtain the CQI value, and the CQI value that obtains and the emitting antenna combination information of selection are issued transmitting terminal.Described CQI value is told The data which type of MCS of transmitting terminal behind corresponding TTI transmission of one line coding.
In control word CQICHSCW, the structure of control word CQICHSCW is as shown in table 1 with the emitting antenna combination information setting selected for receiving terminal.
The structure of table 1 control word CQICHSCW
| Bit number | Purposes | |
| The |
2 | The number of the transmitting antenna of Shi Yonging simultaneously |
| The CQIValue bit field | 5 | The value of CQI |
| The |
2 | Do not use |
As shown in table 1, described CQICHSCW comprises RANK bit field, CQIValue bit field and reservation bit territory.
According to the present invention, be example with 4 transmit antennas, can make the corresponding predetermined transmitting antenna of each bit in RANK bit field and the reservation bit territory.The emitting antenna combination information setting selected in RANK bit field and reservation bit territory, like this, just can be determined whether to select transmitting antenna according to the value of each bit in described RANK bit field and the reservation bit territory.For example, when some bit values get 1, represent that the transmitting antenna of this bit correspondence is used at current TTI, get 0, represent that the transmitting antenna of this bit correspondence is not used at current TTI when some bit values.Certainly also can adopt opposite method for expressing, that is, when some bit values get 1, represent that the transmitting antenna of this bit correspondence is not used at current TTI, get 0, represent that the transmitting antenna of this bit correspondence is used at current TTI when some bit values.Like this, bit value is the transmitting antenna of 1 corresponding transmitting antenna for selecting in RANK bit field and the reservation bit territory.Because when selecting transmitting antenna, adopt the channel capacity maximization principle to select transmitting antenna, so, adopt selected transmitting antenna to transmit and can reach higher efficiency of transmission to receiving terminal, perhaps reach lower Packet Error Ratio at receiving terminal.
Therefore, the present invention uses 2 bits in reservation bit territory, combines with 2 bits in Rank territory, forms the territory of 4 bits, and each bit of these 4 bits is controlled each on off state of 4 transmitting antennas respectively.According to the present invention, also RANK bit field and reservation bit territory are called the emitting antenna combination information field
Step 4, transmitting terminal use the emitting antenna combination of selecting to transmit to receiving terminal.
After transmitting terminal receives emitting antenna combination information by the CQICHSCW channel, obtain emission day combined information, use the emitting antenna combination of selecting to transmit to receiving terminal.
As shown in Figure 3, the invention also discloses a kind of communication system in multi-input multi-output system, comprising: transmitting terminal be used to use each transmitting antenna, or the emitting antenna combination of selecting transmits to receiving terminal; Receiving terminal is used for the selection emitting antenna combination that transmits according to each transmitting antenna, and gives transmitting terminal with the emitting antenna combination feedback information of selecting, so that transmitting terminal adopts the emitting antenna combination of selecting to transmit to transmitting terminal.
Described receiving terminal comprises: receiving element is used to receive the transmitting of each transmitting antenna of transmitting terminal; Selected cell is according to the selection emitting antenna combination that transmits of each transmitting antenna; The unit is set, with the emitting antenna combination information setting selected in the emitting antenna combination information field; Transmitting element is used for the emitting antenna combination information field is issued transmitting terminal.
Described transmitting terminal comprises: receiving element is used to receive the emitting antenna combination information of the selection of receiving terminal feedback; Determining unit is determined emitting antenna combination according to the transmitting antenna information of receiving terminal feedback; Transmitter unit, the emitting antenna combination that is used to adopt determining unit to determine transmits to receiving terminal.
Therefore, according to the present invention, owing to adopt the channel capacity maximization principle to select transmitting antenna at receiving terminal, and the transmitting antenna of selecting issued transmitting terminal, so, transmitting terminal adopts selected transmitting antenna to transmit to receiving terminal can reach higher efficiency of transmission, perhaps reaches lower Packet Error Ratio at receiving terminal.
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (9)
1, a kind of communication means in multi-input multi-output system is characterized in that, comprising:
Receiving terminal is selected emitting antenna combination according to channel situation;
Receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting;
Transmitting terminal uses the emitting antenna combination of selecting to transmit to receiving terminal according to the described emitting antenna combination information that receives;
Wherein, described receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting and is specifically comprised: receiving terminal with the emitting antenna combination information setting selected in the emitting antenna combination information field, and the emitting antenna combination information field issued transmitting terminal, each bit corresponds respectively to each transmitting antenna of transmitting terminal in the described emitting antenna combination information field.
2, communication means according to claim 1 is characterized in that, described emitting antenna combination information field is in order to RANK bit field and reservation bit territory in the indication of displacement single codeword mode channel quality.
3, communication means according to claim 1 is characterized in that, transmitting terminal determines whether to select corresponding each transmitting antenna according to the value of each bit in the described emitting antenna combination information field.
4, communication means according to claim 1 is characterized in that, described selection emitting antenna combination specifically comprises: select emitting antenna combination according to the maximized principle of transfer rate.
5, communication means according to claim 1, it is characterized in that described receiving terminal is issued transmitting terminal with the emitting antenna combination information of selecting and specifically comprised: receiving terminal is issued transmitting terminal by single codeword mode channel quality indicator channel with the emitting antenna combination information field.
6, a kind of communication system in multi-input multi-output system is characterized in that, comprising:
Transmitting terminal, the emitting antenna combination that is used to use receiving terminal to select transmits to receiving terminal;
Receiving terminal is used for selecting emitting antenna combination according to channel situation, and gives transmitting terminal with the emitting antenna combination feedback information of selecting, so that transmitting terminal adopts the emitting antenna combination of selecting to transmit to transmitting terminal;
Wherein said receiving terminal also comprises:
Receiving element is used to receive the transmitting of each transmitting antenna of transmitting terminal;
Selected cell is selected emitting antenna combination according to channel situation;
The unit is set, and in the emitting antenna combination information field, each bit corresponds respectively to each transmitting antenna of transmitting terminal in the wherein said emitting antenna combination information field with the emitting antenna combination information setting selected;
Transmitting element is used for the emitting antenna combination information field is issued transmitting terminal.
7, communication system according to claim 6 is characterized in that, described transmitting terminal comprises:
Receiving element is used to receive the emitting antenna combination information of the selection of receiving terminal feedback;
Determining unit is determined emitting antenna combination according to the transmitting antenna information of receiving terminal feedback;
Transmitter unit, the emitting antenna combination that is used to adopt determining unit to determine transmits to receiving terminal.
8, a kind of receiving terminal is characterized in that, comprising:
Receiving element is used to receive the transmitting of each transmitting antenna of transmitting terminal;
Selected cell is selected emitting antenna combination according to channel situation;
The unit is set, and in the emitting antenna combination information field, wherein, each bit corresponds respectively to each transmitting antenna of transmitting terminal in the described emitting antenna combination information field with the emitting antenna combination information setting selected;
Transmitting element is used for the emitting antenna combination information field is issued transmitting terminal.
9, a kind of transmitting terminal is characterized in that, comprising:
Receiving element, be used to receive the emitting antenna combination information of the selection of receiving terminal feedback, wherein, the emitting antenna combination information setting is in the emitting antenna combination information field, and each bit corresponds respectively to each transmitting antenna of transmitting terminal in the described emitting antenna combination information field;
Determining unit is determined emitting antenna combination according to the transmitting antenna information of receiving terminal feedback;
Transmitter unit, the emitting antenna combination that is used to adopt determining unit to determine transmits to receiving terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101276476A CN100499396C (en) | 2006-08-31 | 2006-08-31 | Communication method and system in multi-input multi-output system |
| PCT/CN2007/002607 WO2008028408A1 (en) | 2006-08-31 | 2007-08-30 | A communication method and system in the mimo system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101276476A CN100499396C (en) | 2006-08-31 | 2006-08-31 | Communication method and system in multi-input multi-output system |
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| CN101114862A CN101114862A (en) | 2008-01-30 |
| CN100499396C true CN100499396C (en) | 2009-06-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317610A (en) * | 2016-04-26 | 2017-11-03 | 中兴通讯股份有限公司 | Message sending, receiving method and device, base station |
| CN106452533B (en) * | 2016-11-16 | 2019-05-10 | 电子科技大学 | A kind of receiving end antenna selecting method based on maximum capacity |
| CN113472410B (en) * | 2018-01-12 | 2023-07-18 | 华为技术有限公司 | Channel state information feedback method and device in wireless communication system |
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| KR100641132B1 (en) * | 2003-07-11 | 2006-11-02 | 엘지전자 주식회사 | Transmit diversity apparatus and method in mobile communication system |
| KR100706634B1 (en) * | 2004-11-12 | 2007-04-11 | 한국전자통신연구원 | Multi-input multi-output system having enhanced performance |
| CN100392995C (en) * | 2004-11-17 | 2008-06-04 | 中兴通讯股份有限公司 | Down link multiple-user dispath for multiple-transmission antenna and multiple-receiving antenna system |
| KR20060089804A (en) * | 2005-02-04 | 2006-08-09 | 삼성전자주식회사 | Transmission method for mimo system |
| CN1815941A (en) * | 2005-02-04 | 2006-08-09 | 松下电器产业株式会社 | Antenna selection and Bit distribution method and apparatus in multi-antenna transmission system |
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| WO2008028408A1 (en) | 2008-03-13 |
| CN101114862A (en) | 2008-01-30 |
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