CN100471086C - Method for selecting send-antenna through closed-loop control in multi-antenna system - Google Patents
Method for selecting send-antenna through closed-loop control in multi-antenna system Download PDFInfo
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- CN100471086C CN100471086C CNB2005100871501A CN200510087150A CN100471086C CN 100471086 C CN100471086 C CN 100471086C CN B2005100871501 A CNB2005100871501 A CN B2005100871501A CN 200510087150 A CN200510087150 A CN 200510087150A CN 100471086 C CN100471086 C CN 100471086C
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Abstract
The method includes steps: (1) at initial phase, transmitting pilot signal from all transmission antennas at transmitting end of multiaerial system; transmitting data signal from a transmission antenna known by both transmitting end and receiving end; (2) through channel estimation, the receiving end carries out measure of channel fading for all sub carrier waves at pilot frequency position of all antennas at receiving end; average ratio of S/N or average channel power is calculated out; transmission antenna with maximal ratio of S/N or average channel power is selected out; number of the selected transmission antenna is retuned to the transmission end; (3) through the selected transmission channel, the transmission end transmits pilot frequency and data signal.
Description
Technical field
Extensive use along with high-rate services such as multimedias, requirement to indexs such as mobile radio system transmission rate, transmission quality, efficiency of transmission and transmission power consumptions is more and more higher, traditional transmission means can not satisfy these requirements fully, and OFDM (quadrature carrier frequency division multiplexing) and multi-antenna transmitting transferring technology are exactly the wireless transmission new technology that proposes in order to satisfy these demands.
Background technology
Multi-antenna technology is a kind of for utilizing the spatial domain resource, improve system transmissions speed, band system band utilance and systematic function and propose empty the time send and receive transmission technology, multi-antenna technology comprises many antennas of transmitting terminal and many antennas of receiving terminal, promptly can adopt many antennas to carry out received signal, reach the purpose that receive diversity improves systematic function at receiving terminal.
In communication, adopt multi-antenna technology that higher transmission rate can be provided, in OFDM (quadrature carrier frequency division multiplexing) system, can be the different transmission plan of providing of multiple wireless traffic.But, under the situation of or specific (special) requirements lower at service rate, send the phase mutual interference between the many antennas that bring for fear of multi-antenna transmitting, perhaps because the restriction of pilot sequence length, can't carry out channel estimating to a plurality of transmitting antennas at receiving terminal, be difficult to carry out to received signal demodulation simultaneously.Like this, just require to reduce the number of transmitting antenna to satisfy the needs of signal transmission.
If transmitting antenna of system just can satisfy the needs of service rate and quality, then can adopt and from a plurality of transmitting antennas, select an antenna to transmit.It is scheme at transmitting antenna of a plurality of emitting antenna selecting, an a plurality of or reception antenna that transmitting antenna is selected.It line options also is a kind of multi-antenna technology, sends simultaneously than manying antenna that to have transmitted power little, and other users are disturbed little advantage, has eliminated the many interference between antennas of each user, so systematic function is good.
It line options can be divided into three kinds of modes: select an antenna fixing in communication process as the signal transmitting antenna in a plurality of transmitting antennas arbitrarily; The transmission signal that system takes turns on a plurality of transmitting antennas; System selects one of them antenna as the signal transmitting antenna according to the channel fading characteristic by automatic control controlling mechanism, utilizes the fading characteristic of channel fully, reaches the raising systematic function, reduces the purpose of system's transmitted power.
Having proposed use TSTD (time is switched the transmission diversity) technology at present in 3G (Third Generation) Moblie WCDMA communication standard is exactly a kind of day line options technology, and it uses different transmitting antennas to send signal in different time slots.But, also be not used in the sky line options technology in the ofdm system at present.
The OFDM that adopt as basic transmission technology more in future mobile communications, and a day line options technology will be widely used in the ofdm system.Use transmitting antenna to select technology can utilize many antennas of transmitting terminal to reach the effect that sends diversity fully at ofdm system.
Transmitting antenna is selected must to obtain certain priori conditions at transmitting terminal, such as the decline situation in channel future or according to certain machine-processed known transmitting antenna that will use.So the closed-loop control adaptive antenna selects to relate to a series of information acquisition, feedback information and technology such as information processing and adaptive control.
Summary of the invention
At problems of the prior art, the invention provides a kind of method of in multiaerial system, selecting transmitting antenna by closed-loop control.
According to an aspect of the present invention, provide a kind of method of in the ofdm system of many antennas, selecting transmitting antenna, comprised step by closed-loop control:
(1) in the communication starting stage, pilot signal transmitted on all transmitting antennas of the transmitting terminal of described multiaerial system, and on all known certain transmitting antenna of the transmitting terminal of described multiaerial system and receiving terminal, send data-signal;
(2) described receiving terminal is measured the channel fading of all subcarriers on the pilot frequency locations on all antennas that send to described receiving terminal by channel estimating, and calculate the average signal interference-to-noise ratio or the average channel power of all subcarriers respectively, select the transmitting antenna of average signal interference-to-noise ratio or average channel power maximum, and the sequence number of the transmitting antenna of the average signal interference-to-noise ratio of described selection or average channel power maximum is fed back to described transmitting terminal by feedback channel;
(3) described transmitting terminal sends pilot tone and data-signal on the transmitting antenna of the average signal interference-to-noise ratio of described selection or average channel power maximum.
This method also comprises step:
(4) described receiving terminal requires to judge according to time or incident whether needs change transmitting antenna, and when needs change transmitting antenna, to described transmitting terminal transmitting antenna change signal;
(5) described transmitting terminal is according to the antenna change signal that receives, pilot signal transmitted on all transmitting antennas;
(6) described receiving terminal is selected the transmitting antenna of average signal interference-to-noise ratio or average channel power maximum, and by feedback channel the sequence number of the described transmitting antenna of selecting is fed back to described transmitting terminal;
(7) described transmitting terminal judges according to the transmitting antenna sequence number that receives whether needs change transmitting antenna, change transmitting antenna if desired, then on antenna after changing, send pilot tone and data-signal, otherwise still on original selected antenna, send pilot tone and data-signal.
Preferably, all during pilot signal transmitted, utilize the pilot tone on the transmitting antenna that sends data-signal that channel is measured at all antennas, and data detection signal.
Preferably, the pilot tone that sends on each antenna is overlapping in time, also is overlapping on frequency, thereby the pilot tone that sends on these transmitting antennas has taken identical subcarrier and identical time period.Wherein the cross-correlation coefficient between each pilot tone is 0 or minimum.
Preferably, the pilot tone that sends on each antenna is overlapping in time, but on frequency quadrature, thereby the pilot tone that sends on these transmitting antennas has taken different subcarrier and identical time period.
Preferably, the pilot tone that sends on each antenna is overlapping in time, but the pilot tone at frequency top antenna is mutually orthogonal, the pilot tone of part antenna is overlapping, thereby the pilot tone that sends on all transmitting antennas is overlapping in time, the pilot tone of the overlapping transmitting antenna of pilot tone takies identical subcarrier on the frequency domain on frequency domain, and takies different subcarriers with pilot tone on other antennas on frequency domain.
Preferably, the pilot tone that a part of transmitting antenna sends is overlapping in time, and with other transmitting antennas on the pilot tone that sends quadrature in time.
Preferably, overlapping in time pilot tone also is overlapping on frequency, thereby the pilot tone that sends on these transmitting antennas has taken identical subcarrier and identical time period.
Preferably, overlapping in time pilot tone quadrature on frequency, thus the pilot tone that sends on these transmitting antennas has taken different subcarrier and identical time period.
Preferably, each antenna on frequency domain or quadrature or overlapping, on frequency domain or take identical subcarrier, or takies different subcarriers thereby the pilot tone that sends on these antenna is overlapping in time in the pilot tone of overlapping transmission on the time-domain.
Preferably, the transmitting antenna that sends data-signal sends data-signal and a pilot tone in a time slot, and channel measurement is selected transmitting antenna based on the channel estimating on the described pilot frequency locations.
Preferably, the transmitting antenna that sends data-signal sends data-signal and two pilot tones in a time slot, and channel measurement is selected transmitting antenna based on the channel estimating on any one pilot frequency locations.
Preferably, select the transmitting antenna of average signal interference-to-noise ratio maximum to comprise in the step (2):
Estimate that by channel estimation method the signal noise interference ratio is SINR on the 1st subcarrier of j transmitting antenna to i the reception antenna
I, j, l
Calculate j transmitting antenna again and take average signal interference-to-noise ratio SINR on the subcarrier to all of all reception antennas of receiving terminal
j,
Select n transmitting antenna as transmitting antenna, wherein n satisfies
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select.
Preferably, select the transmitting antenna of average channel power maximum to comprise in the middle step (2):
Estimate that by channel estimation method j transmitting antenna to the 1st subcarrier upper signal channel decline power on i the reception antenna is | CH
I, j, l|
2,
Calculate j transmitting antenna again and take average channel decline power C on the subcarrier to all of all reception antennas of receiving terminal
j,
Select n transmitting antenna as transmitting antenna, wherein n satisfies
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select.
Preferably, the time requirement described in the step (4) refers to the regular hour and just carries out the change of transmitting antenna.
Preferably, the described time is a time slot or each time slot, perhaps a frame or each frame.
Preferably, described incident requires to be meant instruction or the incident more than the physical layer.
In the present invention, in order to obtain the channel fading situation of each transmitting antenna to reception antenna, need measure channel, the method of measuring is all to send pilot frequency sequence on each transmitting antenna, estimate to estimate the channel fading situation of each transmitting antenna by multi-antenna channel at receiving terminal like this to reception antenna, pilot frequency sequence on the different transmitting antennas adopts the mode of time-division or spatial reuse in a time slot, carry out the operation that multi-antenna channel is estimated at receiving terminal.So just guaranteed to obtain the decline situation on all transmitting antennas.Measurement result is given transmitting terminal through handling the feedback information that transforms into day line options, guaranteed that like this feedack amount is few as much as possible, and the method that this adaptive antenna is selected is applicable in the system of Frequency Division Duplexing (FDD) and TDD mode.In the present invention, in time transmitting antenna is upgraded, make transmitting terminal select best antenna to send all the time, guaranteed that like this performance of system is in best condition.
Description of drawings
Fig. 1 shows the flow chart according to adaptive antenna option program of the present invention;
Fig. 2 shows according to the link structure of adaptive antenna system of selection transmitting terminal of the present invention and receiving terminal and the information interaction between the sending and receiving end;
Transmitting terminal sent the pilot data structure of time slot exemplary plot of signal when Fig. 3 showed initialization or carries out the transmitting antenna renewal;
Fig. 4 shows the pilot tone of transmitting terminal transmission under the situation that transmitting antenna has been selected and the structure of time slot illustrated example of data;
Fig. 5 shows basic wireless transmission unit example in the ofdm system;
Fig. 6 shows example system according to the present invention at 5 kilometers simulation results during translational speed per hour.
Embodiment
Below with reference to Figure of description technical scheme of the present invention is described in conjunction with the preferred embodiments also.
Be located in the ofdm system the individual transmitting antenna of the total N of transmitting terminal (N〉1), receiving terminal has the individual reception antenna of M (M 〉=1), sends signal and has taken L subcarrier.In sending initial frame, transmitting terminal will be on N transmitting antenna the while pilot signal transmitted, on the transmitting antenna of certain acquiescence, send data-signal, the pilot data structure of time slot of its transmission can multiple kind of form, as shown in Figure 3.
The pilot tone that transmitting terminal sends has two effects, promptly each transmitting antenna is carried out channel measurement to the channel of receiving terminal, calculates the best transmitting antenna of performance, and channel estimating, is used for the demodulation to the transmission data.
Receiving terminal carries out channel estimating with the signal of pilot portion, and is SINR according to signal noise interference ratio on the 1st subcarrier of j transmitting antenna of channel estimation calculation to i the reception antenna
I, j, l, all take the average signal interference-to-noise ratio SINR on the subcarrier to all reception antennas of receiving terminal to calculate j transmitting antenna again
j, choose n transmitting antenna as transmitting antenna, wherein n satisfies
The transmitting antenna of selecting like this to obtain sends the bit error rate performance that can make system have the best.After n had selected, receiving terminal fed back to transmitting terminal by feedback channel with n, used for transmitting terminal sky line options; Simultaneously receiving terminal is used for the demodulation of received signal to the result with channel estimating, and promptly receiving terminal obtains the channel fading of acquiescence transmitting antenna to receiving terminal with channel estimating, and the data of default antenna transmission are carried out demodulation.Receive the sequence number n of the next transmitting antenna of receiving terminal feedback when transmitting terminal after, transmitting terminal will carry out the transmission of pilot tone and data on n transmitting antenna, and its pilot tone and data sending time slots structure are as shown in Figure 4.Transmitting terminal is after sending signal on the n antenna, and receiving terminal will carry out channel estimating and input to received signal to be handled, and promptly receiving terminal carries out channel estimating to pilot tone, and estimated result is used for data-signal demodulation operation partly.Receiving terminal by the feedback channel cycle to transmitting terminal transmitting antenna update signal so that transmitting terminal sends pilot tone on N transmitting antenna, carry out remeasuring of channel and reselecting of transmitting antenna, wherein the cycle may be a frame or a plurality of frame.Fig. 1 shows the flow chart according to adaptive antenna option program of the present invention.As shown in Figure 1, its step is as described below
The first step, the initialization process, transmitting terminal is given tacit consent in N transmitting antenna or a selected at random transmitting antenna (send for the first time and can specify certain transmitting antenna) sends data.Send pilot frequency sequence on all N transmitting antenna, this pilot frequency sequence is used to carry out day line options and channel estimating, and the pilot tone of its transmission and data slot structure are as shown in Figure 3;
In second step, receiving terminal is estimated to the channel fading of receiving terminal all transmitting antennas of transmitting terminal according to the pilot signal that receives.In M reception antenna, estimate that the pilot signal noise interference ratio is SINR on the 1st subcarrier of j transmitting antenna to i the reception antenna
I, j, l, calculate j transmitting antenna again and do noise ratio SINR to the average letter that all of all reception antennas of receiving terminal take the pilot signal on the subcarrier
jCalculate and relatively choose n transmitting antenna as transmitting antenna, wherein n satisfies
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select send signal.Wherein the square value that also can replace with the channel fading mould the calculating of Signal Interference and Noise Ratio in this step is the calculating of channel fading power.
In the 3rd step, receiving terminal is estimated to the channel fading of each antenna of receiving terminal the transmitting antenna that sends data, and the result that will obtain is used for the signal that sends is carried out demodulation operation.
In the 4th step, judge whether communication process finishes, if finished to change over to the 11 step
The 5th goes on foot, and judges whether to exist the drive signal of antenna renewal, then changes for the 6th step if desired over to, if do not need, then changes for the 8th step over to.Wherein to upgrade can be to drive the time to antenna, and promptly receiving terminal carries out transmitting antenna according to the decision of time cycle property and upgrades, perhaps event-driven, and promptly receiving terminal is according to the renewal of the instruction decision transmitting antenna on upper strata.
In the 6th step, receiving terminal changes signal by feedback channel to transmitting terminal transmission transmitting antenna.
In the 7th step, transmitting terminal sends pilot frequency sequence, and only sends data-signal on n transmitting antenna according to the antenna update instruction that receives on all N transmitting antenna, and the pilot tone of its transmission and data slot structure changed for second step over to as shown in Figure 3.
In the 8th step, transmitting terminal need to judge whether the change antenna according to the selection sky line that the recipient sends.Be then to change for the 9th step over to; Otherwise directly changed for the tenth step over to.
The 9th step, to reselect transmitting antenna n and send data and pilot signal, form is as shown in Figure 4.
In the tenth step, transmitting terminal sends pilot tone and data-signal on selected antenna, and its structure of time slot is shown in Fig. 3 a-3e.Other transmitting antenna does not send any signal.Changed for the 3rd step over to
The 11 step, sign off.
Fig. 2 shows according to the link structure of transmitting terminal in the adaptive antenna system of selection of the present invention and receiving terminal and the information interaction between the sending and receiving end.If transmitting terminal is for sending for the first time signal (initialization), transmitting terminal sends the pilot signal on a plurality of antennas according to method shown in Figure 3 so, wherein the pilot frequency sequence that sends on the pilot frequency sequence that sends on each antenna and other transmitting antennas is different, can distinguish a plurality of transmitting antennas like this when receiving terminal carries out channel measurement.Code modulated data send on an antenna of acquiescence.
If transmitting antenna n is selected, so the pilot tone on n the antenna is sent and the data after sending coded modulation on the n antenna, the signal slot topology example of its transmission is as shown in Figure 4.
If need to upgrade transmitting antenna, transmitting antenna will carry out the transmission of pilot tone and data according to pilot tone shown in Figure 3 and data slot structure so, and wherein data will send on n antenna, and n is the transmitting antenna sequence number of data in the previous frame (time slot).
When transmitting terminal after all sending pilot tone on each transmitting antenna, receiving terminal can obtain transmitting terminal by the control channel that transmitting terminal sends and whether all send pilot tone on each antenna.The detection of receiving terminal process signal and the selection that channel estimating is carried out transmitting antenna and the feedback of transmitting antenna sequence number.Wherein the signal noise interference ratio is SINR on the 1st subcarrier of j transmitting antenna of channel estimation calculation to i the reception antenna
I, j, l, all take the average signal interference-to-noise ratio SINR on the subcarrier to all reception antennas of receiving terminal to calculate j transmitting antenna again
j, choose n transmitting antenna as transmitting antenna, wherein n satisfies
The transmitting antenna of selecting like this to obtain sends the bit error rate performance that can make system have the best.After n had selected, receiving terminal fed back to transmitting terminal by feedback channel with n, used for transmitting terminal sky line options.Selected at transmitting antenna, receiving terminal is as long as estimate channel on the transmitting antenna, and the detection of carrying out signal obtains the data that transmitting terminal sends and get final product, wherein SINR
IjBe the SINR of j transmitting antenna to i reception antenna channel
I, j, lMean value.
Fig. 3 be initialization or carry out transmitting antenna when upgrading transmitting terminal send the pilot data structure of time slot exemplary plot of signal.Its pilot tone is provided with form following situation:
(1) pilot tone on each antenna can send by the mode that sky divides, and promptly the pilot tone that sends on each transmitting antenna is overlapping in time, also is overlapping on frequency domain, that is to say that the pilot tone that they send has taken identical subcarrier, shown in Fig. 3 a.
(2) pilot tone that sends on each antenna is overlapping in time, but is quadrature on frequency, that is to say, the pilot tone that they send has taken different subcarrier, shown in Fig. 3 a.
(3) pilot tone that sends on each antenna is overlapping in time, but be that quadrature component is overlapping between the part antenna on the frequency, be that the pilot tone that sends on each antenna overlaps each other in time, but the pilot tone of a part of transmitting antenna takies identical subcarrier on frequency domain, and on frequency domain, take different carrier waves with pilot tone on other antenna, shown in Fig. 3 a.
(4) pilot tone of a part of antenna transmission is overlapping in time, and with other antenna on the pilot tone that sends be quadrature in time.And overlapping in time pilot tone will have pilot tone time domain, the frequency domain mentioned in (1) or (2) or (3) form is set, shown in Fig. 3 b, Fig. 3 c, Fig. 3 d and Fig. 3 e.
(5) pilot tone on the transmitting antenna of transmission data-signal can be that pilot tone 1 and pilot tone 2 all send shown in Fig. 3 b and Fig. 3 c, perhaps only locates in one of pilot tone 1 or 2 positions to send shown in Fig. 3 d and Fig. 3 e.
Fig. 4 is the pilot tone of transmitting terminal transmission under the situation that transmitting antenna has been selected and the structure of time slot illustrated example of data.Wherein pilot tone and data only send on n selected antenna, and other transmitting antenna does not send any signal.
Fig. 5 is the exemplary plot of basic radio-cell, promptly on the direction of frequency CU 15 of 1024 subcarriers, and on time orientation each piece user data all be provided with pilot frequency sequence end to end, be used to carry out channel estimating, signal is detected demodulation process.
In the ofdm system of 8 reception antennas of one 4 transmitting antennas, adopt the closed loop transmitting antenna to select its emulation flow graph of technology as shown in Figure 1.In system bandwidth is 20MHz, its single user's subcarrier allocation as shown in Figure 5, each user distributes 15 continuous sub-carriers in 1024 subcarriers, modulation system adopts QPSK, coded system is 1/3 convolution code, channel is the multipath Rayleigh channel.
At first transmitting terminal is sending data and sending pilot tone on 4 all transmitting antenna on first antenna, its structure of time slot is shown in Fig. 3 b, carry out channel estimating at receiving terminal so, channel on the subcarrier on all transmitting antennas is measured, estimated that the signal noise interference ratio is SINR on the 1st subcarrier of j transmitting antenna to i the reception antenna
I, j, l, calculate j transmitting antenna again and take average signal interference-to-noise ratio SINR on the subcarrier to all of all reception antennas of receiving terminal
j, choose n transmitting antenna as transmitting antenna, wherein n satisfies
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select.System will be when sending next time like this, sends signal according to the structure of time slot of Fig. 3 on n transmitting antenna, and receiving terminal carries out the demodulation of channel estimating and received signal; If transmitting terminal is received the antenna selection instruction n and the antenna update instruction of receiving terminal feedback, transmitting terminal will send data and send pilot tone on all transmitting antennas on n transmitting antenna so, and its data and pilot time slot structure are shown in Fig. 3 b; If sign off this moment is judged by system, stop so sending.
Fig. 6 shows example system according to the present invention at 5 kilometers simulation results during translational speed per hour.As shown in Figure 6, illustrate that the present invention can improve the performance of system greatly, has realizability and advance.
Claims (17)
1, a kind of method of selecting transmitting antenna in the ofdm system of many antennas by closed-loop control comprises step:
(1) in the communication starting stage, pilot signal transmitted on all transmitting antennas of the transmitting terminal of the ofdm system of described many antennas, and on all known certain transmitting antenna of the transmitting terminal of the ofdm system of described many antennas and receiving terminal, send data-signal;
(2) described receiving terminal is measured the channel fading of all subcarriers on the pilot frequency locations on all antennas that send to described receiving terminal by channel estimating, and calculate the average signal interference-to-noise ratio or the average channel power of all subcarriers respectively, select the transmitting antenna of average signal interference-to-noise ratio or average channel power maximum, and the sequence number of the transmitting antenna of the average signal interference-to-noise ratio of described selection or average channel power maximum is fed back to described transmitting terminal by feedback channel;
(3) described transmitting terminal sends pilot tone and data-signal on the transmitting antenna of the average signal interference-to-noise ratio of described selection or average channel power maximum;
(4) described receiving terminal requires to judge according to time or incident whether needs change transmitting antenna, and when needs change transmitting antenna, to described transmitting terminal transmitting antenna change signal;
This method also comprises step:
(5) described transmitting terminal is according to the antenna change signal that receives, pilot signal transmitted on all transmitting antennas;
(6) described receiving terminal is selected the transmitting antenna of average signal interference-to-noise ratio or average channel power maximum, and by feedback channel the sequence number of the described transmitting antenna of selecting is fed back to described transmitting terminal;
(7) described transmitting terminal judges according to the transmitting antenna sequence number that receives whether needs change transmitting antenna, change transmitting antenna if desired, then on antenna after changing, send pilot tone and data-signal, otherwise still on original selected antenna, send pilot tone and data-signal.
2, method according to claim 1 wherein all during pilot signal transmitted, utilizes the pilot tone on the transmitting antenna that sends data-signal that channel is measured at all antennas, and data detection signal.
3, method according to claim 1, wherein the pilot tone that sends on each antenna is overlapping on time-domain, also is overlapping on frequency domain, thus the pilot tone that sends on these transmitting antennas has taken identical subcarrier and identical time period.
4, method according to claim 1, wherein the pilot tone that sends on each antenna is overlapping on time-domain, but on frequency domain quadrature, thereby the pilot tone that sends on these transmitting antennas has taken different subcarrier and identical time period.
5, method according to claim 1, wherein the pilot tone that sends on each antenna is overlapping on time-domain, but the pilot tone at frequency domain top antenna is mutually orthogonal, the pilot tone of part antenna is overlapping, thereby the pilot tone that sends on all transmitting antennas is overlapping on time-domain, the pilot tone of the overlapping transmitting antenna of pilot tone takies identical subcarrier on the frequency domain on frequency domain, and takies different subcarriers with pilot tone on other antennas on frequency domain.
6, method according to claim 1, the pilot tone that wherein a part of transmitting antenna sends is overlapping on time-domain, and with other transmitting antennas on pilot tone quadrature on time-domain of sending.
7, method according to claim 6 also be overlapping on frequency domain in pilot tone overlapping on the time-domain wherein, thereby the pilot tone that sends on these transmitting antennas has taken identical subcarrier and identical time period.
8, method according to claim 6, wherein at pilot tone overlapping on time-domain quadrature on frequency domain, thereby the pilot tone that sends on these transmitting antennas has taken different subcarrier and identical time period.
9, method according to claim 6, wherein each antenna in the pilot tone of overlapping transmission on the time-domain on frequency domain or quadrature or overlapping, thereby the pilot tone that sends on these antenna is overlapping on the time-domain and on frequency domain or take identical subcarrier, or takies different subcarriers.
10, method according to claim 1, the transmitting antenna that wherein sends data-signal sends data-signal and a pilot tone in a time slot, and channel measurement is selected transmitting antenna based on the channel estimating on the described pilot frequency locations.
11, method according to claim 1, the transmitting antenna that wherein sends data-signal sends data-signal and two pilot tones in a time slot, and channel measurement is selected transmitting antenna based on the channel estimating on any one pilot frequency locations.
12, according to claim 3,5,7 or 9 described methods, wherein the cross-correlation coefficient between each pilot tone is 0 or very little.
13, method according to claim 1, wherein step (2) if in select the transmitting antenna of average signal interference-to-noise ratio maximum, then this selection step comprises:
Estimate that by channel estimation method the signal noise interference ratio is SINR on l the subcarrier of j transmitting antenna to i the reception antenna
I, j, l
Calculate j transmitting antenna again and take average signal interference-to-noise ratio SINR on the subcarrier to all of all reception antennas of receiving terminal
j,
Select n transmitting antenna as transmitting antenna, wherein n satisfies
N is the number of transmitting antenna,
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select.
14, method according to claim 1, wherein step (2) if in select the transmitting antenna of average channel power maximum, then this selection step comprises:
Estimate that by channel estimation method j transmitting antenna to l subcarrier upper signal channel decline power on i the reception antenna is | CH
I, j, l|
2,
Calculate j transmitting antenna again and take average channel decline power C on the subcarrier to all of all reception antennas of receiving terminal
j,
Select n transmitting antenna as transmitting antenna, wherein n satisfies
N is the number of transmitting antenna,
And transmitting antenna sequence number n is fed back to transmitting terminal by feedback channel be used to carry out transmitting antenna and select.
15, method according to claim 1, wherein the time requirement described in the step (4) refers to the regular hour and just carries out the change of transmitting antenna.
16, method according to claim 15, the wherein said time is a time slot or a plurality of time slot, perhaps a frame or a plurality of frame.
17, method according to claim 1, wherein the incident described in the step (4) requires to be meant instruction or the incident more than the physical layer.
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| CN103312395B (en) * | 2012-03-15 | 2016-03-30 | 西门子公司 | A kind of antenna in radio communication system system of selection and Wireless Telecom Equipment |
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| CN104158579A (en) * | 2013-05-14 | 2014-11-19 | 华为技术有限公司 | Method and device for antenna selection |
| CN103929364A (en) * | 2014-05-07 | 2014-07-16 | 北京邮电大学 | Method and device for controlling intelligently collaborative multi-path transmission of receiving end |
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| CN1507695A (en) * | 2001-03-30 | 2004-06-23 | ���µ�����ҵ��ʽ���� | Combined selective time switching transmission diversity (STSTD) method and system |
| CN1604497A (en) * | 2004-11-19 | 2005-04-06 | 清华大学 | A downstream transmitting antenna selecting method adaptive for distributed system |
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2005
- 2005-07-27 CN CNB2005100871501A patent/CN100471086C/en not_active Expired - Fee Related
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| CN1272293A (en) * | 1998-06-20 | 2000-11-01 | 三星电子株式会社 | Device and method for providing selection transmit diversity in mobile communication system |
| CN1507695A (en) * | 2001-03-30 | 2004-06-23 | ���µ�����ҵ��ʽ���� | Combined selective time switching transmission diversity (STSTD) method and system |
| CN1476270A (en) * | 2002-08-12 | 2004-02-18 | 华为技术有限公司 | Selection method of transmitting antenna in multiantenna communication environment |
| CN1499867A (en) * | 2002-11-04 | 2004-05-26 | 深圳市中兴通讯股份有限公司 | Method and device for realtime antenna to select emission diversity |
| CN1604497A (en) * | 2004-11-19 | 2005-04-06 | 清华大学 | A downstream transmitting antenna selecting method adaptive for distributed system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10469153B2 (en) | 2016-04-05 | 2019-11-05 | Huawei Technologies Co., Ltd. | Antenna measurement method and terminal |
| US10659136B2 (en) | 2016-04-05 | 2020-05-19 | Huawei Technologies Co., Ltd. | Antenna measurement method and terminal |
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| CN1710826A (en) | 2005-12-21 |
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