CN105262524B - The multi-user dispatching method of mimo system based on feedback compensation - Google Patents
The multi-user dispatching method of mimo system based on feedback compensation Download PDFInfo
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- CN105262524B CN105262524B CN201510560023.2A CN201510560023A CN105262524B CN 105262524 B CN105262524 B CN 105262524B CN 201510560023 A CN201510560023 A CN 201510560023A CN 105262524 B CN105262524 B CN 105262524B
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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
- H04B7/0452—Multi-user MIMO systems
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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 kind of multi-user dispatching methods of the mimo system based on feedback compensation, and it is to carry out user's scheduling using the channel state information of delay merely bit error rate is caused to reduce mainly to solve the problem of the prior art.Implementation step is：1. base station sends training sequence to user, user estimates channel state information according to the signal received and the training sequence of transmission；2. user by feedback channel to base station feedback channel state information, while the related coefficient in feedback channel between delay of feedback channel state information and real channel status information；3. the related coefficient between the channel state information of the delay received and two kinds of channel state informations is combined into new scheduling coefficient by base station, the user of the corresponding scheduling coefficient maximum of simultaneous selection accesses channel, realizes data transmission.The present invention can arrive more preferably performance of BER, available for the multi-subscriber dispatching in extensive mimo system.
Description
Technical field
The invention belongs to wireless communication field, the multi-user dispatching method being related in mimo system, available for when user to
There is the multi-subscriber dispatching of time delay in the channel state information of base station feedback.
Background technology
Multi-user dispatching method in mimo system can effectively improve the system performance and power system capacity of system, simultaneously
Improve system stability.However, in the case of reality, due between user and base station there are a certain distance, meanwhile, user
Estimation is carried out to channel state information needs the regular hour, and system is wanted to obtain perfect channel state information relatively difficult.
For the multi-subscriber dispatching problem of the system of faulty channel state information, there are many scholars to carry out at present deep
Research, such as L.Yang in 2009 is in " Achievable rate of MIMO systems with multi-user
Research is there are Time-delayed Feedback in diversity and delayed feedback ", while utilizes the MIMO systems of multi-user diversity
The achievable rate of system, Mohammad Torabi in 2009 et al. are in " BER Performance Analysis of
It has studied to exist in Multiuser Diversity with Antenna Selection in MRC MIMO Systems " and prolong
When the maximum ratio fed back merge the bit error rate performance of mimo system, Xiang-bin Yu in 2014 et al. are in " Unified
Analysis of Multiuser Scheduling for Downlink MIMO Systems with Imperfect
The performance of the multi-subscriber dispatching of the downlink mimo system there are Time-delayed Feedback is had studied in CSI ".
However, when there is the channel state information of delay in mimo system, do not used in achievement in research above
Relation between the channel state information of delay and real channel state information.They are simply used in original scheduling coefficient
The channel state information of delay substitutes real channel state information, then, user's scheduling is carried out with this new scheduling coefficient,
Compared with possessing the system of real channel status information, in the case of same received signal to noise ratio, can unquestionably cause be
The reduction of the bit error rate performance of system.
The content of the invention
It is an object of the invention to be directed to the deficiency of above-mentioned prior art, a kind of mimo system based on feedback compensation is proposed
Multi-user dispatching method, to improve the reliability of system, reduce transmission bit error rate.
To achieve the above object, technical scheme includes the following steps：
1) base station sends training sequence to user, and user estimates channel shape according to the training sequence and received signal
State information H；
2) in the case of assuming that the uplink feedback channel from user to base station will not be subject to noise jamming, i.e., sent out in user
In the case of the arrival base station that the channel state information sent can be errorless, user is by feedback channel to base station feedback channel status
Information H, base station receive the channel state information of delayUser's delay of feedback channel state information in feedback channel simultaneouslyRelated coefficient c between real channel status information H；
3) the delayed channel status information that base station will receivePhase relation between described two channel state informations
Number c is combined into new scheduling coefficient λ, the scheduling coefficient λ of different user(k)It is expressed as：
Wherein, N be user total number, λ(k)For the corresponding scheduling coefficient of k-th of user,For 2 norms of matrix
Square, ckFor the real channel status information H of k-th of user(k)With delayed channel status informationBetween related coefficient；
4) in all scheduling coefficient λ(k)In, choose maximum scheduling coefficient λ(u)Corresponding user u accesses channel carries out
Data transmission.
The invention has the advantages that：
(1) present invention is utilized due to considering the relation between real channel state information and the status information of delay
Related coefficient between them, so as to be delayed in base station channel state information when, thus can obtain preferably missing ratio
Special rate performance；
(2) present invention employs multi-subscriber dispatching, the reliability of system is improved.
Below by attached drawing and embodiment, the invention will be further described.
Description of the drawings
Fig. 1 is the realization flow chart of the present invention；
Fig. 2 is the system model figure that present invention emulation uses；
Fig. 3 is the performance simulation figure that the system average error bit rate of the present invention changes with signal-to-noise ratio；
Fig. 4 is the system average error bit rate of the present invention with the performance simulation figure for receiving number of users variation.
Specific embodiment
With reference to Fig. 2, the communication system that the present invention uses is made of base station, transmission channel, feedback channel and user；Wherein,
There is N in base stationtRoot transmitting antenna, every antenna are mutual indepedent；There is N number of user in system, it is each with there is N per familyrRoot reception antenna；
Transmission channel between every transmission antenna and reception antenna is obeyed multiple Gauss and is distributed, between different transmission channels mutually solely
It is vertical, while send channel and additive white Gaussian noise is subject to disturb；Since different users is different with a distance from base station, each user
The signal power received can be subject to different degrees of attenuation.
With reference to Fig. 1, specific implementation step of the invention is as follows：
Step 1：Obtain channel state information estimate H.
(1) base station sends training sequence x known to user to user, and user, which obtains, receives signal, the table of the reception signal
Show that formula is：Y=Hx+n, wherein n are the additive white Gaussian noise vector being subject in transmission process, and H is in signals transmission
Damping matrix；
(2) the training sequence x that user is sent using the signal y and base station that receive, obtains according to least mean-square error
The estimate of damping matrix in signals transmission, i.e. channel state information is：
Wherein, ()TRepresent vector conjugate transposition, I be unit matrix, RH=E { HTH } for channel state information H from
Correlation matrix, E { } are statistical expection symbol, and r is zoom factor, and effect is to reduce evaluated error,To receive noise work(
Rate；
Step 2：User, to base station feedback channel state information H, while is fed back in feedback channel every by feedback channel
The real channel status information H of a user(k)With delayed channel status informationBetween related coefficient ck。
When needing to expend certain by carrying out channel estimation according to received signal and training sequence due to user
Between, meanwhile, when user is to base station feedback channel state information, base station is spaced a distance with user, carries out channel status letter
The feedback of breath is also required to expend the regular hour, so the delayed channel status information that base station receivesWith real channel shape
State information H is differed, i.e., the channel state information that base station receivesIt is the result after real channel status information H delays；
The related coefficient of each user expresses formula：
Wherein, N be user total number, J0() represents first kind zero Bessel function,For k-th of user most
Maximum Doppler frequency shift, τkFor the time delay of the corresponding channel state information of k-th of user.
Step 3：Base station is according to the delayed channel status information receivedBetween above two channel state information
The corresponding related coefficient c of different userk, build new scheduling coefficient λk。
(3.1) delayed channel status informationThere are certain time delay relation between real channel status information H, therefore two
Meet following relational expressions between person：
Wherein, H(k)For the real channel status information of k-th of user,For the delayed channel state letter of k-th of user
Breath；ckFor the real channel status information H of k-th of user(k)With delayed channel status informationBetween related coefficient, E(k)
For the channel errors matrix of k-th of user, each single item all Gaussian distributeds in error matrix, while its channel with delay
Status informationIndependently of each other；
(3.2) according to proportional fair algorithm, the ratio of base station selected received signal to noise ratio and average signal-to-noise ratioMaximum user carries out data transmission,
Wherein, γ(k)For the received signal to noise ratio of k-th of user, expression formula is：
For the average received signal-to-noise ratio of k-th of user, expression formula is：
In formula, ρkFor the power attenuation coefficient of k-th of user,For the total power signal that k-th of user receives,
For received noise power,For 2 norm squareds of matrix；
(3.3) proportional fair algorithm is by the ratio ε in upper step (3.2)(k)As scheduling coefficient, select the coefficient maximum
User carry out data transmission；
(3.4) present invention combines above-mentioned real channel status information H and delayed channel status informationBetween relation
Formula utilizes the channel state information of delayRelated coefficient c between two kinds of channel state informations of different userkStructure is new
Scheduling coefficient λ(k)：
Wherein, λ(k)For the corresponding scheduling coefficient of k-th of user,For 2 norm squareds of matrix, ckFor k-th of user
Real channel status information H(k)With delayed channel status informationBetween related coefficient.
From step (3.3), the scheduling coefficient ε in proportional fair algorithm only make use of delayed channel status information, phase
Than in the system for possessing real channel status information, bit error rate performance has apparent reduction.
Step 4：In all scheduling coefficient λ(k)In, choose maximum scheduling coefficient λ(u)Corresponding user u accesses channel
Carry out data transmission.
It is true in contrast to simply being replaced in proportional fair algorithm with the channel state information of delay from step (3.4)
Channel state information, the new scheduling coefficient λ used in of the invention(k)It make use of the phase relation between two kinds of channel state informations
Number, so having better approximation to real channel status information.Therefore, performance of BER of the invention also just can be approached more
Possess the performance of BER of the system of real channel state information, so as to compensate for channel state information delay on system
The influence of energy.
The effect of the present invention can be further illustrated by following emulation：
1. simulated conditions
Emulate the communication system such as Fig. 2 used, all transmission channels are quasi-static Rayleigh flat fading channel, channel system
It is zero that number, which obeys average, and the multiple Gauss that variance is 1 is distributed, while it is that average is 0 to send the interference that channel is subject to, and variance is 1
Additive white Gaussian noise.
All emulation, using selective transmission scheme, selective Merge Scenarios is used in receiving terminal in transmitting terminal.Due to
The each position of user within the system is random equally distributed, i.e., the distance between each user and base station are random uniform
Distribution, so the power attenuation factor that each user is thought in this emulation is stochastic variable, and obey 0.8~1.0
Between be uniformly distributed.Simultaneously, it is assumed that between the real channel status information and delayed channel status information in this emulation
Related coefficient is also stochastic variable, and obeys being uniformly distributed between 0.9~1.0.
2. emulation content and result
The system average error bit rate when constellation set S is 16QAM constellations is emulated with the present invention, respectively with being believed with true
The average error bit rate that channel state information and delayed channel status information carry out user's scheduling is compared.
Emulation 1, if communication system base station has 200 transmitting antennas, there is 100 users, each 5 antennas of loading per family
Compare the bit error rate of three kinds of schemes with the change curve of average received signal-to-noise ratio, the results are shown in Figure 3.
From the figure 3, it may be seen that in the case where real channel status information cannot be obtained, carried out compared to delay state information
The scheme of user's scheduling, the present invention can obtain better performance of BER.Moreover, reach 2 × 10 in bit error rate-5When,
Compared with the invention using delayed channel status information, the present invention program can obtain the performance boost of 0.4dB or so.And with
The increase of average received signal-to-noise ratio, advantage of the invention is more obvious.
Emulation 2, if communication system base station has 10 transmission antennas, each user is mounted with 5 antennas, believes in average received
The bit error rate made an uproar than under conditions of for 10dB, comparing three kinds of schemes is with the curve for receiving number of users variation, as a result such as Fig. 4 institutes
Show.
As shown in Figure 4, it is fixed in average received signal-to-noise ratio, receive user for any number of, comparison is adopted
With the method for delayed channel status information, the present invention can obtain better performance of BER.
Claims (4)
1. a kind of multi-user dispatching method of the mimo system based on feedback compensation, includes the following steps：
1) base station sends training sequence to user, and user believes according to the training sequence and received signal estimation channel status
Cease H；
2) in the case of assuming that the uplink feedback channel from user to base station will not be subject to noise jamming, i.e., sent in user
In the case of the arrival base station that channel state information can be errorless, user is by feedback channel to base station feedback channel state information
H, base station receive the delayed channel status information of user feedbackUser is according to time delay size computation delay channel status simultaneously
InformationRelated coefficient c between real channel status information Hk, and the related coefficient is fed back into base in feedback channel
It stands；
3) the delayed channel status information that base station will receiveRelated coefficient c between described two channel state informationskGroup
Synthesize new scheduling coefficient λ(k)：
<mrow>
<msup>
<mi>&lambda;</mi>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>)</mo>
</mrow>
</msup>
<mo>=</mo>
<msubsup>
<mi>c</mi>
<mi>k</mi>
<mn>2</mn>
</msubsup>
<mo>|</mo>
<mo>|</mo>
<msup>
<mover>
<mi>H</mi>
<mo>^</mo>
</mover>
<mrow>
<mo>(</mo>
<mi>k</mi>
<mo>)</mo>
</mrow>
</msup>
<mo>|</mo>
<msubsup>
<mo>|</mo>
<mn>2</mn>
<mn>2</mn>
</msubsup>
<mo>,</mo>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>,</mo>
<mn>...</mn>
<mo>,</mo>
<mi>N</mi>
<mo>,</mo>
</mrow>
Wherein, N be user total number, λ(k)For the corresponding scheduling coefficient of k-th of user,For square of 2 norms of matrix,
ckFor the real channel status information H of k-th of user(k)With delayed channel status informationBetween related coefficient；
4) in all scheduling coefficient λ(k)In, choose maximum scheduling coefficient λ(u)Corresponding user u accesses channel carries out data
Transmission.
2. the multi-user dispatching method of the mimo system according to claim 1 based on feedback compensation, wherein in step 1)
Signal received by user, expression formula are：
Y=Hx+n,
Wherein, x be base station send training sequence vector, H be signals transmission in damping matrix, i.e., corresponding channel shape
State information, n are the noise jamming vector being subject in transmission process, and y is the signal vector that user receives.
3. the multi-user dispatching method of the mimo system according to claim 1 based on feedback compensation, wherein step 1) institute
The user stated estimates channel state information H according to the training sequence and received signal, is carried out by equation below：
<mrow>
<mi>H</mi>
<mo>=</mo>
<mi>y</mi>
<msup>
<mrow>
<mo>(</mo>
<msup>
<mi>x</mi>
<mi>T</mi>
</msup>
<msub>
<mi>R</mi>
<mi>H</mi>
</msub>
<mi>x</mi>
<mo>+</mo>
<msubsup>
<mi>&sigma;</mi>
<mi>n</mi>
<mn>2</mn>
</msubsup>
<mi>r</mi>
<mi>I</mi>
<mo>)</mo>
</mrow>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<msup>
<mi>x</mi>
<mi>T</mi>
</msup>
<msub>
<mi>R</mi>
<mi>H</mi>
</msub>
<mo>,</mo>
</mrow>
Wherein, ()TRepresent the conjugate transposition of vector, x is the training sequence vector that base station is sent, and y is the signal that user receives
Vector, I be unit matrix, RH=E { HTH } be channel state information H autocorrelation matrix, E { } is statistical expection symbol, and r is
Zoom factor, effect are to reduce evaluated error,For received noise power.
4. the multi-user dispatching method of the mimo system according to claim 1 based on feedback compensation, wherein the step
2) the related coefficient c ink, refer to the phase relation between the real channel status information of each user and delayed channel status information
Number, expression are：
<mrow>
<msub>
<mi>c</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msub>
<mi>J</mi>
<mn>0</mn>
</msub>
<mrow>
<mo>(</mo>
<mn>2</mn>
<msubsup>
<mi>&pi;f</mi>
<mi>d</mi>
<mi>k</mi>
</msubsup>
<msub>
<mi>&tau;</mi>
<mi>k</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>,</mo>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>,</mo>
<mn>...</mn>
<mo>,</mo>
<mi>N</mi>
<mo>,</mo>
</mrow>
Wherein, J0() represents first kind zero Bessel function,For the Doppler frequency shift of k-th of user, τkFor k-th of use
The time delay of family channel state information, ckFor the real channel status information H of k-th of user(k)With delayed channel status informationBetween related coefficient.
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| CN115843121A (en) * | 2021-09-18 | 2023-03-24 | 中兴通讯股份有限公司 | User scheduling method in multi-antenna signal transmission, electronic device and storage medium |
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| CN102883455A (en) * | 2012-10-30 | 2013-01-16 | 东南大学 | Multi-user scheduling method based on signal-to-leakage-and-noise ratio (SLNR) under delayed feedback |
| CN103532671A (en) * | 2013-10-16 | 2014-01-22 | 南通大学 | MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system bit distribution method based on delay channel state information |
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| KR100946924B1 (en) * | 2005-06-24 | 2010-03-09 | 삼성전자주식회사 | User terminal selection method in zero forcing beamforming algorithm |
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| CN102883455A (en) * | 2012-10-30 | 2013-01-16 | 东南大学 | Multi-user scheduling method based on signal-to-leakage-and-noise ratio (SLNR) under delayed feedback |
| CN103532671A (en) * | 2013-10-16 | 2014-01-22 | 南通大学 | MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system bit distribution method based on delay channel state information |
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| 《On End-to-End Performance of MIMO Multiuser in Cognitive Radio Networks》;Yuli Yang等;《Global Telecommunications Conference,2011:1-5》;20111231;全文 * |
| Unified Analysis of Multiuser Scheduling for Downlink MIMO Systems with Imperfect CSI;Xiangbin Yu等;《IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS》;20140331;第13卷(第3期);全文 * |
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