CN100589339C - Method for selecting transmitting antenna in space multiplexing multi-input and multi-output system - Google Patents
Method for selecting transmitting antenna in space multiplexing multi-input and multi-output system Download PDFInfo
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- CN100589339C CN100589339C CN200710073155A CN200710073155A CN100589339C CN 100589339 C CN100589339 C CN 100589339C CN 200710073155 A CN200710073155 A CN 200710073155A CN 200710073155 A CN200710073155 A CN 200710073155A CN 100589339 C CN100589339 C CN 100589339C
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Abstract
The invention discloses one space multiple input and output system emission antenna selection method, which comprises the following steps: demodulating the received guide frequency information and estimating its error and comparing the error and preset limit to estimate current signal status; according to the front signal channel to determine antenna not satisfying needs and mapping the information to the guide frequency information and feeding back the selection information according to the signal channel status signals; according to the feedback selection information to fulfill the emissionsignal map and optimization emission.
Description
Technical field
The present invention relates to a kind of system of selection of transmitting antenna, the system of selection of transmitting antenna in especially a kind of space multiplexing multi-input and multi-output system.
Background technology
Transmission and receiving terminal at a wireless system all adopt many antenna elements, utilize the abundant space multidimensional characteristic of wireless scatter channel, work in the mode of the many outputs of many inputs, can improve the channel capacity of system breakthroughly.MIMO (multipleinput multiple output according to above thought proposition, multiple-input and multiple-output) technology is that Modern wireless communication has been opened up a brand-new field, it gives following mobile communication system, particularly the business that high-speed data is inserted provides a kind of means that can greatly improve system data rate and spectrum efficiency under the situation that does not increase bandwidth.
Mimo channel under the mobile environment changes, and capacity also changes, thereby the channel that how to adapt to variation is the key that realizes space domain self-adapted link.Yet, be not that the multichannel capacity is big more more for transmitting antenna under the low rank channel.Under low rank channel, the signal that different antennae is sent can't separate at receiving terminal, perhaps, noise require higher signal to noise ratio to make that the cost of separating is very big owing to improving, at this moment, if all antennas all send signal, because the phase mutual interference of signal, may all can not be restored at receiving end signal, in this case, if the selective reception end transmitting antenna that can separate is launched selectively, although can not satisfy the peak rate requirement, still can guarantee link rate to a certain extent.Therefore, how the choose reasonable transmitting antenna is the basis of realizing space domain self-adapted link.
At present, the criterion of day line options has three kinds usually: the one, and the power system capacity maximization in this manner, will select to make the antenna subset of power system capacity maximum from a plurality of antennas; The 2nd, the maximization received signal to noise ratio in this manner, will be selected the subclass of several antennas of fading factor amplitude maximum from a plurality of antennas; Three are based on the second-order statistics of channel, the minimized average error probability, but this mode needs the state information of feedback channel.
In order to realize needing to solve following 3 problems by selecting transmitting antenna to guarantee the maximum multiplexing coefficient of space channel:
1, need to determine the total number of transmitting antenna of selection;
2, determine to select which transmit antennas;
3, the antenna condition feedback information of selecting is arrived transmitting terminal.
For overcoming the above problems, the main at present several method that adopts following discloses:
At the application number of on October 24th, 2002 application is to have described a kind of emitting antenna selecting method based on the maximum channel capacity principle 02822041.2 the Chinese patent application method of a plurality of days line options antenna subsets " in the diversity system from ", comprise the selection of emitting antenna selecting and reception antenna, the thinking of two kinds of sky line options is just the same, and when carrying out emitting antenna selecting, think that the reception antenna number remains unchanged, promptly at M
TSelect M antenna to transmit in the individual transmitting antenna and (suppose that the reception antenna number remains N
R), basic thought is from M
TDelete the channel capacity maximum after the feasible deletion in the individual transmitting antenna one by one.But this patent does not have explanation how to determine the numerical value of M.
Described a kind of emitting antenna selecting device in the application number of on July 8th, 2004 application is 200410063629.7 Chinese patent application " transmission diversity apparatus in the mobile communication system and method ": receiver is to carrying out BLAST (BellLap Layered Space-Time from the received signal of many reception antennas, Bel folds formula layering space time) decoding, the signal to noise ratio of calculating the forward channel relevant with every transmit antennas is to determine the channel characteristics of the forward channel that every transmit antennas is corresponding in many transmit antennas, and with this channel status feature as the selection feedback information of transmitting antenna to transmitter, by transmitter according to this Information Selection state preferably transmitting antenna come the transmitting business signal.But, do not illustrate in this application and judge the foundation of selecting several transmit antennas.
Above-mentioned existing methods deficiency is: based on channel capacity, and difficult transmitting antenna sum that need to determine selection; Select antenna according to the signal to noise ratio of restituted signal, consider to remove the improvement of signal to noise ratio behind the signal that an antenna sends, the number of transmit antennas that needs to select has than mistake.And, select antenna based on channel capacity, need repeatedly calculate determinant, select antenna based on signal-to-noise ratio (SNR) estimation, need the operand of additional estimated signal to noise ratio, this all can strengthen operand.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of system of selection that can realize simultaneously determine to need selecting as transmitting antenna in the antenna amount of transmitting antenna and the concrete space multiplexing multi-input and multi-output system of determining selecteed antenna.
The technical solution adopted for the present invention to solve the technical problems is:
The system of selection of transmitting antenna in a kind of space multiplexing multi-input and multi-output system comprises:
1.1 according to pilot tone column vector S
PilotCalculate the peaked channal noise power of current system with channel matrix B, determine the antenna of the pairing transmitting terminal of described peaked channal noise power, and the antenna number of described system transmitting terminal is designated as M from described system transmitting terminal to receiving terminal;
1.2 described peaked channal noise power and the noise power threshold of presetting are compared, if described peaked channal noise power is less than or equal to described noise power threshold, then will respectively be listed as the antenna of pairing described system transmitting terminal among the described channel matrix B as transmitting antenna, the number of transmission antennas of M for determining finishes the selection of transmitting antenna simultaneously; If described peaked channal noise power greater than 1, then enters step 1.3 greater than described noise power threshold and M; If described peaked channal noise power equals 1 greater than described noise power threshold and M, then enter step 1.4;
1.3 delete the row of the antenna correspondence of the pairing transmitting terminal of described peaked channal noise power among the described channel matrix B, and delete described pilot tone column vector S
PilotIn the pilot value of antenna correspondence of the pairing transmitting terminal of described peaked channal noise power, replacement M=M-1, and get back to step 1.1;
1.4 determine a transmit antennas, and finish the selection of transmitting antenna.
Step 1.1 may further comprise the steps described in the such scheme:
2.1 compute matrix G, wherein G=(B
HB)
-1B
H, wherein H represents conjugate transpose;
2.2 calculate the norm of each not deleted antenna of described system transmitting terminal according to matrix G || G
m||
2Variable G wherein
mBe the column vector of described each not deleted pairing matrix G of antenna, and determine the antenna of system's transmitting terminal of norm maximum in the described result of calculation and described maximum norm correspondence;
2.3 according to described pilot tone column vector S
PilotAnd the column vector calculation frequency pilot sign among the pairing described matrix G of the antenna of system's transmitting terminal of described maximum norm correspondence;
2.4 the pilot value according to the antenna correspondence of system's transmitting terminal of described frequency pilot sign and described maximum norm correspondence is calculated current peaked channal noise power.
The transmitting antenna of determining in the described step 1.4 of such scheme is the antenna of the pairing described system of the norm minimum value transmitting terminal of calculating in the described step 2.2.
In the such scheme, described pilot tone column vector S
PilotBe to separate from the antenna reception column vector of described system receiving terminal, described channel matrix B is according to described pilot tone column vector S
PilotEstimate.
In the such scheme, if the channel of described system is a frequency selective fading channels, the row of the antenna correspondence of the pairing transmitting terminal of described peaked channal noise power in the then described step 1.3 among the described channel matrix B of deletion comprise the row of respectively launching the symbol correspondence on the antenna of described transmitting terminal.
Beneficial effect of the present invention mainly shows: technical scheme provided by the invention compared with prior art, need to select antenna amount to determine that with concrete two processes of selecteed antenna merge with determining as transmitting antenna, significantly reduce the step of day line options in the mimo system, improved the adaptivity of Radio Link in the mimo system.
Description of drawings
Fig. 1 is an emitting antenna selecting flow chart of the present invention;
Fig. 2 realizes ber curve behind wireless VBLAST (VerticalBell Laboratories Layered Space-Time Code, the vertical bell laboratories layered space time-code) adaptive link for the TD-SCDMA system by three kinds of modes;
Fig. 3 realizes throughput curve behind the wireless VBLAST adaptive link for the TD-SCDMA system by three kinds of modes.
Embodiment
The present invention has utilized pilot tone in the wireless communication system to have the basic assumption of the highest demodulation reliability, at receiving terminal the pilot frequency information that receives being carried out demodulating error estimates, the noise power threshold that this sum of errors is default compares, with the status condition of definite respective channel, and according to definite antenna amount and specifically definite two targets of selecteed antenna that need selection as transmitting antenna of estimated channel status condition realization.Its core concept is to utilize the poorest channel and the noise power threshold of presetting to compare, if the poorest channel can satisfy system requirements, then remaining channel also can meet the demands; If the poorest channel does not meet the demands, then that it is corresponding transmitting antenna deletion, remaining channel condition is judged in recirculation, till remaining channel satisfies system requirements.
The invention will be further described below in conjunction with accompanying drawing.
At first, make following notation convention:
Transmitting terminal at mimo system has M root antenna, has N root reception antenna at receiving terminal, and M≤N, and the antenna of transmitting terminal is numbered from 1 to M with natural number.With reference to Fig. 1, the system of selection of transmitting antenna in a kind of space multiplexing multi-input and multi-output system comprises:
Step 1: system receiving terminal receives transmitting, and isolates N dimension pilot tone column vector S from the signal that receives
Pilot
Step 2: utilize this pilot tone column vector of separating that channel condition information is estimated, the channel matrix that obtains from the transmitting terminal to the receiving terminal is H
N * M, H
N * MIn element h
NmThe transfer function of expression from the m transmitting antenna to the n reception antenna;
Step 3: with this channel matrix H
N * MAssignment is given variable B, and the attached value of the antenna number M of transmitting terminal is given variable Q;
Step 4: compute matrix G, G=(B
HB)
-1B
H(H represents conjugate transpose), and the norm of not deleted each the antenna correspondence of computing system transmitting terminal || G
m||
2, wherein m is each not deleted antenna corresponding sequence number of transmitting terminal, G
mThe expression sequence number is the column vector among the matrix G of antenna correspondence of transmitting terminal of m;
Step 5: ask the maximum in the norm of calculating in the step 4, and determine the sequence number k of its corresponding transmitting terminal antenna;
Step 6:, calculate weight vector according to the sequence number k of the transmitting terminal antenna that obtains in the step 5
G
kThe expression sequence number is the column vector among the matrix G of antenna correspondence of transmitting terminal of k;
Step 9: calculate frequency pilot sign
Wherein k is the sequence number of the transmitting terminal antenna determined in the step 5;
Step 10: calculate maximum noise power
Wherein k is the sequence number of the transmitting terminal antenna determined in the step 5, p
kBe the pilot value of this antenna correspondence, this noise power has been represented the demodulation ability to pilot frequency information, has also reflected the respective channel state of pilot tone correspondence indirectly;
Step 11: with this noise power σ
k 2With the noise power threshold σ that sets in advance
Ref 2Compare, if σ
k 2Be less than or equal to σ
Ref 2, represent that then the poorest channel of condition also can satisfy system requirements, this moment, the antenna of matrix B system's transmitting terminal that respectively row are corresponding was selected transmitting antenna, the number of transmission antennas of Q for determining, an end day line options flow process; If σ
k 2Greater than the noise power threshold σ that sets in advance
Ref 2, represent that then the poorest channel of condition can not satisfy system requirements, then will be with the antenna deletion of this channel correspondence, if Q greater than 1, changes step 12 over to so; If Q equals 1, then change step 13 over to;
Step 12: sequence number is the row of antenna correspondence of the transmitting terminal of k in the deletion matrix B, and matrix B is upgraded, if system channel is a frequency selective fading channels, then need delete the row of respectively launching the symbol correspondence on this antenna; Deletion S
PilotThe pilot tone of the antenna correspondence of the transmitting terminal that middle sequence number is k is to S
PilotUpgrade; And upgrade Q=Q-1, get back to step 4 then;
Step 13: the sequence number of the pairing transmitting terminal antenna of minimum value in the norm of calculating in the determining step 4, and this antenna finished a day line options after as transmitting antenna.
The error rate comparative result of Fig. 2 for using 1 transmit antennas not use antenna selecting method of the present invention, use 2 transmit antennas not use antenna selecting method of the present invention and use 2 transmit antennas to use antenna selecting method of the present invention to obtain simultaneously.The throughput comparative result of Fig. 3 for using 1 transmit antennas not use antenna selecting method of the present invention, use 2 transmit antennas not use antenna selecting method of the present invention and use 2 transmit antennas to use antenna selecting method of the present invention to obtain simultaneously.Channel model when adopting empty that 3GPP (3rd GenerationPartnership Project, 3G affiliate engineering) provides in the emulation is selected the urban macro cell scenario, disregards path loss and shadow fading.Base station end antenna is 8 yuan of uniform circular arrays, and mobile you antenna number is 2, and array element distance is 0.5 wavelength, and number of users is 4, and the travelling carriage translational speed is 30km/h, and simulation times is 100.From the result as can be seen, adopt antenna selecting method of the present invention to need to select antenna amount and concrete definite two processes of selecteed antenna to merge with determining as transmitting antenna, significantly reduce the step of day line options in the mimo system, improved the adaptivity of Radio Link in the mimo system.
Claims (4)
1, the system of selection of transmitting antenna in a kind of space multiplexing multi-input and multi-output system is characterized in that comprising:
1.1 according to pilot tone column vector S
PilotCalculate the peaked channal noise power of current system with channel matrix B, determine the antenna of the pairing transmitting terminal of described peaked channal noise power, and the antenna number of described system transmitting terminal is designated as M from described system transmitting terminal to receiving terminal;
1.2 described peaked channal noise power and the noise power threshold of presetting are compared, if described peaked channal noise power is less than or equal to described noise power threshold, then will respectively be listed as the antenna of pairing described system transmitting terminal among the described channel matrix B as transmitting antenna, the number of transmission antennas of M for determining finishes the selection of transmitting antenna simultaneously; If described peaked channal noise power greater than 1, then enters step 1.3 greater than described noise power threshold and M; If described peaked channal noise power equals 1 greater than described noise power threshold and M, then enter step 1.4;
1.3 delete the row of the antenna correspondence of the pairing transmitting terminal of described peaked channal noise power among the described channel matrix B, and delete described pilot tone column vector S
PilotIn the pilot value of antenna correspondence of the pairing transmitting terminal of described peaked channal noise power, replacement M=M-1, and get back to step 1.1;
1.4 determine a transmit antennas, and finish the selection of transmitting antenna;
Wherein, described step 1.1 may further comprise the steps:
2.1 compute matrix G, wherein G=(B
HB)
-1B
H, wherein H represents conjugate transpose;
2.2 calculate the norm of each not deleted antenna of described system transmitting terminal according to matrix G || G
m||
2, variable G wherein
mBe the column vector of described each not deleted pairing matrix G of antenna, and determine the antenna of system's transmitting terminal of norm maximum in the described result of calculation and described maximum norm correspondence;
2.3 according to described pilot tone column vector S
PilotAnd the column vector calculation frequency pilot sign among the pairing described matrix G of the antenna of system's transmitting terminal of described maximum norm correspondence;
2.4 the pilot value according to the antenna correspondence of system's transmitting terminal of described frequency pilot sign and described maximum norm correspondence is calculated current peaked channal noise power.
2, the system of selection of transmitting antenna in the space multiplexing multi-input and multi-output system as claimed in claim 1 is characterized in that the transmitting antenna of determining in the described step 1.4 is the antenna of the pairing described system of the norm minimum value transmitting terminal of calculating in the described step 2.2.
3, the system of selection of transmitting antenna in the space multiplexing multi-input and multi-output system as claimed in claim 2 is characterized in that: described pilot tone column vector S
PilotBe to separate from the antenna reception column vector of described system receiving terminal, described channel matrix B is according to described pilot tone column vector S
PilotEstimate.
4, as the system of selection of transmitting antenna in one of them described space multiplexing multi-input and multi-output system of claim 1 to 3, it is characterized in that: if the channel of described system is a frequency selective fading channels, the row of the antenna correspondence of the pairing transmitting terminal of described peaked channal noise power in the then described step 1.3 among the described channel matrix B of deletion comprise the row of respectively launching the symbol correspondence on the antenna of described transmitting terminal.
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| CN100589339C true CN100589339C (en) | 2010-02-10 |
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Families Citing this family (14)
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| WO2008120925A1 (en) | 2007-03-29 | 2008-10-09 | Lg Electronics Inc. | Method of transmitting sounding reference signal in wireless communication system |
| KR101397039B1 (en) | 2007-08-14 | 2014-05-20 | 엘지전자 주식회사 | Signal Transmission Method Using CDM Against The Effect Of Channel Estimation Error in Transmit Diversity System |
| EP2104986B1 (en) | 2007-08-14 | 2012-10-03 | LG Electronics Inc. | Method for acquiring resource region information for phich |
| KR101507785B1 (en) * | 2007-08-16 | 2015-04-03 | 엘지전자 주식회사 | A method for transmitting channel quality information in a MIMO (Multiple Input Multiple Output) system |
| KR101405974B1 (en) | 2007-08-16 | 2014-06-27 | 엘지전자 주식회사 | Methods for transmitting codewords in multiple input multiple output system |
| CN101378280B (en) * | 2007-08-30 | 2012-07-18 | 中兴通讯股份有限公司 | Multi-input multi-output system based on antenna selection and signal processing method thereof |
| CN101841355B (en) * | 2009-03-17 | 2013-12-11 | 中兴通讯股份有限公司 | Demodulation pilot frequency mapping processing method and device |
| CN101908937B (en) * | 2010-08-20 | 2012-12-26 | 西安电子科技大学 | Signal detecting method in downlink distribution type MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system |
| WO2014059661A1 (en) * | 2012-10-19 | 2014-04-24 | Qualcomm Incorporated | Receiver diversity control for acquisition mode in td-scdma systems |
| EP2790332B1 (en) * | 2013-04-08 | 2019-09-11 | Acer Incorporated | Communication station with elevation beamforming and related communication device |
| CN103763015B (en) * | 2014-02-10 | 2017-06-23 | 中国人民解放军理工大学 | It is a kind of to have transmission antenna system of selection in the multiple antennas junction network of direct connected link |
| WO2016015307A1 (en) * | 2014-07-31 | 2016-02-04 | 华为技术有限公司 | Signal transmission method and associated device |
| CN109088666B (en) * | 2018-09-27 | 2022-03-29 | 上海金卓科技有限公司 | Signal combining method and device suitable for multiple antennas, receiver and storage medium |
| CN109547085A (en) * | 2019-01-17 | 2019-03-29 | 西安电子科技大学 | A kind of antenna selecting method, device, system, computer equipment and storage medium |
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| CN1710826A (en) * | 2005-07-27 | 2005-12-21 | 北京邮电大学 | Method for selecting send-antenna through closed-loop control in multi-antenna system |
| CN1841961A (en) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841961A (en) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | Method and apparatus for selecting transmitting antenna in multi antenna wireless communication system |
| CN1710826A (en) * | 2005-07-27 | 2005-12-21 | 北京邮电大学 | Method for selecting send-antenna through closed-loop control in multi-antenna system |
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