CN105049099B - The multi-antenna adaptive dispatching method of LTE multiaerial systems - Google Patents

The multi-antenna adaptive dispatching method of LTE multiaerial systems Download PDF

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CN105049099B
CN105049099B CN201510357891.0A CN201510357891A CN105049099B CN 105049099 B CN105049099 B CN 105049099B CN 201510357891 A CN201510357891 A CN 201510357891A CN 105049099 B CN105049099 B CN 105049099B
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msub
antenna
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channel
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CN105049099A (en
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刘健
谭鑫鑫
刘岩
张唯炯
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University of Science and Technology Beijing USTB
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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
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing

Abstract

The invention discloses a kind of multi-antenna adaptive dispatching methods of LTE multiaerial systems, receiving terminal feeds back the signal-to-noise ratio of each channel to transmitting terminal, transmitting terminal calculates the equivalent information quality information under three kinds of antenna modes according to signal-to-noise ratio respectively, then the channel capacity of three kinds of antenna modes is calculated, judgement coefficient is calculated again, if it is determined that coefficient is more than or equal to predetermined threshold value, then using single antenna pattern；Otherwise determine whether the channel capacity for sending diversity mode is more than or equal to the channel capacity of space multiplexing mode, if it is using diversity mode is sent, otherwise using space multiplexing mode.The antenna mode of transmitting terminal is set adaptively by channel SNRs by the present invention, and antenna mode is enable to adapt to present channel environment automatically, and then improves system throughput.

Description

The multi-antenna adaptive dispatching method of LTE multiaerial systems
Technical field
The invention belongs to LTE communication technical fields, more specifically, are related to a kind of multiple antennas of LTE multiaerial systems Self-adapting dispatching method.
Background technology
In order to tackle the challenge of broadband access technology, while in order to meet the needs of new business, International Organization for standardization 3GPP (3rd Generation Partnership Project) will start Universal Mobile Communication System in the end of the year 2004 Long Term Evolution (the Long Term of (Universal Mobile Telecommunication System, UMTS) Evolution, LTE) project.The purpose of the project is exactly to research and develop a High Data Rate, high channel capacity, low latency and low cost Mobile communication system.LTE system is employed with Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiple, OFDM) and multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) be core skill Art, while also come with the use of adaptive coding and modulating (Adaptive Modulation and Coding, AMC) technology into one Walk the performance of raising system.
MIMO technology be exactly the transmitting-receiving two-end in wireless transmission all using more antennas, with traditional single antenna transmissions phase Than, it may be constructed multiple parallel spatial sub-channels between more antennas of transmitting terminal and more antennas of receiving terminal, and these Subchannel can independently transmit information parallel, so on the one hand message transmission rate can be greatlyd improve, so as to meet height The requirement of rate and large capacity；On the other hand the anti-fading and noise resisting ability of system can be improved well again.Therefore, MIMO Technology is also considered as future mobile communications and PCS Personal Communications System realizes high speed data transfers, improves the important of transmission quality Approach.
AMC technologies are exactly the variation according to channel condition, are dynamically selected appropriate modulation and coding mode (Modulation and Coding Scheme,MCS).This technology has been widely used for existing wireless communication system In.Its basic thought is exactly that the channel state information that measures is fed back to using receiving terminal in transmitting terminal, passes through certain processing The parameters such as modulation and coding mode MCS, data rate and transmit power are obtained, then carry out data hair by these parameters It send, to ensure that system performance is optimal under difficult channel conditions.
The basic principle of Adaptive Modulation and Coding is exactly according to current channel condition information CSI, is presented as transmission letter at this time The Signal to Interference plus Noise Ratio SINR or Signal to Noise Ratio (SNR) in road dynamically adjust the coded modulation scheme of transmission channel in receiving terminal, so that Radio channel resource maximally utilizes.However it can not really make system gain and systematicness using Adaptive Modulation and Coding merely It can maximize, and also need to be coordinated using multiple antenna scheduling.Fig. 1 is Adaptive Modulation and Coding AMC model framework charts.Such as Fig. 1 It is shown, in addition to using Adaptive Modulation and Coding, multiple antenna scheduling can also be used, is controlled come the antenna mode to transmitting terminal System.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of multiple antennas of LTE multiaerial systems is adaptive Dispatching method is answered, antenna mode is enable to adapt to present channel environment automatically, improves system throughput.
For achieving the above object, the multi-antenna adaptive dispatching method of LTE multiaerial systems of the present invention, including following Step：
S1：Receiving terminal feeds back the signal-to-noise ratio of each channel to transmitting terminalWherein i represents the sequence number of channel, value model It encloses for i=1,2 ..., number that T, T are feedback channel；
S2：Receiving terminal is according to signal-to-noise ratioThe equivalent information quality information under three kinds of antenna modes is calculated respectively SINRSISO、SINRTDAnd SINRSM, wherein subscript SISO expression single antenna patterns, subscript TD expression transmission diversity modes, subscript SM Representation space multiplexer mode；Calculation formula is respectively：
Wherein, M represents transmitting terminal antenna number, and N represents receiving terminal antenna number；
S3：The channel capacity C of three kinds of antenna modes is calculated respectivelySISO、CTDAnd CSM, calculation formula is：
CSISO=log2(1+SINRSISO)
CTD=log2(1+SINRTD)
CSM=M × log2(1+SINRSM)
S4：Judgement factor alpha is calculated, calculation formula is：
S5：If α >=αth, using single antenna pattern；If it is not, then further determine whether CTD≥CSM, if so, Then using diversity mode is sent, otherwise using space multiplexing mode.
The multi-antenna adaptive dispatching method of LTE multiaerial systems of the present invention, receiving terminal feed back each channel to transmitting terminal Signal-to-noise ratio, transmitting terminal calculates the equivalent information quality information under three kinds of antenna modes according to signal-to-noise ratio, then calculates respectively To the channel capacity of three kinds of antenna modes, then judgement coefficient is calculated, if it is determined that coefficient is more than or equal to predetermined threshold value, then adopts With single antenna pattern；Otherwise determine whether the channel capacity for sending diversity mode is more than or equal to the letter of space multiplexing mode Road capacity, if it is using diversity mode is sent, otherwise using space multiplexing mode.The present invention is come from by channel SNRs The antenna mode of transmitting terminal is adaptively set, antenna mode is enable to adapt to present channel environment automatically, and then improves system throughput Rate.
Description of the drawings
Fig. 1 is Adaptive Modulation and Coding AMC model framework charts；
Fig. 2 is the flow chart of the multi-antenna adaptive dispatching method of LTE multiaerial systems of the present invention；
Fig. 3 is the throughput of system graph under different judgement coefficient thresholdings；
Fig. 4 is throughput graph of the PedB channels under different antennae pattern when number of antennas is 2 × 2；
Fig. 5 is throughput graph of the PedB channels under different antennae pattern when number of antennas is 4 × 4；
Fig. 6 is throughput graph of the VehA channels under different antennae pattern when number of antennas is 2 × 2；
Fig. 7 is throughput graph of the VehA channels under different antennae pattern when number of antennas is 4 × 4；
Fig. 8 is throughput graph of the HI channels under different antennae pattern when number of antennas is 2 × 2；
Fig. 9 is throughput graph of the HI channels under different antennae pattern when number of antennas is 4 × 4.
Specific embodiment
The specific embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Embodiment
Fig. 2 is the flow chart of the multi-antenna adaptive dispatching method of LTE multiaerial systems of the present invention.Shown in each Fig. 2, this hair The multi-antenna adaptive dispatching method of bright LTE multiaerial systems comprises the following steps：
S201：Receiving terminal feedback channel signal-to-noise ratio：
Receiving terminal feeds back the signal-to-noise ratio of each channel to transmitting terminalWherein i represents the sequence number of channel, value range For i=1,2 ..., number, i.e. receiving terminal that T, T are feedback channel reception channel number.
For the ease of calculating, using signal-to-noise ratio computation formula ideally in the present embodiment, i.e., without considering receiving terminal The influence of channel estimation errors and channel time-varying, calculation formula are：
Wherein, PSRSThe reception of district pilots measuring signal (Sound Reference Signal, SRS) where node Power；For the channel power spectrum of j-th of subcarrier, Q is transmission subcarrier number, is determined by system bandwidth B；β declines for channel Fall coefficient, different channel values is different；N0For the power spectral density of interchannel noise；SIRepresent jamming power, i.e., in neighbor cell The sum of all user's pilot signal reception power, are expressed asWhereinRefer in k-th of neighbor cell Pilot power value, the value range of k is k=1, and 2 ..., K, K refer to the pilot signal quantity in neighbor cell.When only considering one During the single user of a cell, jamming power SIValue can ignore.
S202：Calculate equivalent channel quality information：
Receiving terminal is according to signal-to-noise ratioThe equivalent channel quality information SINR under three kinds of antenna modes is calculated respectivelySISO、 SINRTDAnd SINRSM, calculation formula is respectively：
Wherein, M represents transmitting terminal antenna number, and N represents receiving terminal antenna number；Subscript SISO represents single antenna pattern, subscript TD represents to send diversity mode, subscript SM representation space multiplexer modes.
S203：Calculate channel capacity：
According to Shannon's theorems, the channel capacity C of three kinds of antenna modesSISO、CTDAnd CSMRespectively：
CSISO=log2(1+SINRSISO) (5)
CTD=log2(1+SINRTD) (6)
CSM=M × log2(1+SINRSM) (7)
S204：Calculate judgement factor alpha：
From formula (5), (6), (7) as can be seen that working as M=N=1, there is identical equivalent channel under three kinds of antenna modes Quality information and channel capacity, then have SINRSISO=SINRTD=SINRSM, CSISO=CTD=CSM；Work as M, N ＞ 1, multiplexer mode The equivalent channel quality information and channel capacity of SM and diversity mode TD will be bigger than single antenna Mode S ISO.Based on above point Analysis, invention introduces judgement factor alpha, expression formula is：
Obviously the value range of judgement factor alpha is 0 ＜ α≤1.Judgement factor alpha can be used to weigh to be believed under three kinds of antenna modes The relative size of road capacity.
S205：Judge whether α >=αth, αthIt represents default decision threshold, is set according to actual conditions, united by experiment Meter, αthGeneral value range is 0.85≤αth＜ 1.If so, entering step S206, S207 is otherwise entered step.
S206：Setting antenna mode is single antenna pattern.This is because as α >=αth, illustrate institute's energy under three kinds of antenna modes The channel capacity value reached is very close, and also just explanation can obtain the system similar to multiple antennas mode using single antenna mode Performance, but since single antenna is more easy and is easily achieved, so by the compromise of performance and complexity, select single input list The antenna mode transmission of output is more suitable for.
S207：Judge whether CTD≥CSM, if so, illustrating compared to space multiplexing mode, using diversity mode meeting Better system performance is obtained, so selection diversity mode is more particularly suitable, S208 is entered step, otherwise using spatial reuse Pattern can obtain better system performance, enter step S209.
As antenna α ＜ αthWhen, illustrate that better channel capacity can be obtained using multiple antennas, then just need further from It is made choice in transmitting diversity TD and spatial reuse SM both of which, the present invention is directly selected according to the size of channel capacity It selects.
S208：Setting antenna mode is diversity mode.
S209：Setting antenna mode is space multiplexing mode.
In practical applications, the scheduling result of antenna mode with code form can be represented, multi-antenna module is facilitated to know Not, such as the correspondence code of setting single-input single-output SISO patterns is 0, and the correspondence code of transmitting diversity TD patterns is 1, space The correspondence code for being multiplexed SM patterns is 2.
In order to illustrate the technique effect of the present invention, simulating, verifying is carried out to the present invention using a specific example.This is imitative Antenna mode employed in true mainly includes single antenna SISO patterns, sends diversity TD patterns (2 × 2,4 × 4) and space It is multiplexed SM patterns (2 × 2,4 × 4).
Fig. 3 is the throughput of system graph under different judgement coefficient thresholdings.As shown in figure 3, illustrate three kinds of channels： The handling capacity of PedB, VehA and HI.As can be seen that list, multiple antennas decision threshold αthAdaptable System gulps down under different values The amount of spitting is otherwise varied, works as αthValue between 0.9 and 0.95 when, system, which obtains handling capacity, can reach maximum.Therefore, this implementation Judging threshold α is chosen in exampleth=0.9, i.e., when judgement factor alpha >=0.9, choose SISO patterns；As α ＜ 0.9, then choose TD or SM patterns.Figure is compared in the emulation for the throughput of system being given below under different antennae pattern.
Fig. 4 is throughput graph of the PedB channels under different antennae pattern when number of antennas is 2 × 2.Fig. 5 is antenna Throughput graph of the PedB channels under different antennae pattern when number is 4 × 4.As shown in Figure 4 and Figure 5, in channel condition Generally, signal-to-noise ratio than it is relatively low when, system in SISO, send diversity TD and spatial reuse SM these three patterns under institute it is attainable Throughput value is very limited, numerical value also very close to.In contrast, the present invention has a clear superiority, system is in multi-antenna adaptive tune Higher handling capacity can be obtained under degree pattern.Under identical channel circumstance, with the increase of Signal to Noise Ratio (SNR), various antennas Handling capacity under pattern all increased, and the multi-antenna adaptive scheduling method of the present invention still has advantage.When channel item When part is relatively good, it can be obtained no matter number of antennas is 2 × 2 or 4 × 4, SISO pattern and TD patterns, the SM patterns and present invention Throughput value it is very close, and be observed that when Signal to Noise Ratio (SNR) reaches 5dB after, the present invention be substantially all selection sky Between be multiplexed SM patterns as multi-antenna transmission modes.
Fig. 6 is throughput graph of the VehA channels under different antennae pattern when number of antennas is 2 × 2.Fig. 7 is antenna Throughput graph of the VehA channels under different antennae pattern when number is 4 × 4.Fig. 8 is that HI believes when number of antennas is 2 × 2 Throughput graph of the road under different antennae pattern.Fig. 9 be number of antennas be 4 × 4 when HI channels under different antennae pattern Throughput graph.As shown in Figures 6 to 9, although compared to PedB channels, VehA channels and HI channels are more severe, and And throughput value is all declined under each pattern, but as a complete unit, compared with fixed list, multi-antenna mode, system Still there is more prominent performance under the multi-antenna adaptive scheduling method of the present invention.
Which kind of which kind of, no matter can be seen that from above simulation results in simulated environment and channel condition, compare Compared with other three kinds of fixed antenna modes, multi-antenna adaptive scheduling method of the invention all has good handling capacity Can, and all show stable performance advantage.It is possible thereby to prove, multi-antenna adaptive dispatching method proposed by the present invention can To significantly improve the performance of LTE communication system.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of specific embodiment, to the common skill of the art For art personnel, if various change appended claim limit and definite the spirit and scope of the present invention in, these Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.

Claims (3)

1. a kind of multi-antenna adaptive dispatching method of LTE multiaerial systems, which is characterized in that comprise the following steps：
S1：Receiving terminal feeds back the signal-to-noise ratio of each channel to transmitting terminalWherein i represents the sequence number of channel, and value range is I=1,2 ..., T, T be feedback channel number；
S2：Receiving terminal is according to signal-to-noise ratioThe equivalent information quality information SINR under three kinds of antenna modes is calculated respectivelySISO、 SINRTDAnd SINRSM, calculation formula is respectively：
<mrow> <msub> <mi>SINR</mi> <mrow> <mi>S</mi> <mi>I</mi> <mi>S</mi> <mi>O</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>T</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>T</mi> </munderover> <msubsup> <mi>SINR</mi> <mi>R</mi> <mi>i</mi> </msubsup> </mrow>
<mrow> <msub> <mi>SINR</mi> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mi>M</mi> <mi>T</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>T</mi> </munderover> <msubsup> <mi>SINR</mi> <mi>R</mi> <mi>i</mi> </msubsup> </mrow>
<mrow> <msub> <mi>SINR</mi> <mrow> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>=</mo> <msup> <mn>2</mn> <mrow> <mfrac> <mn>1</mn> <mi>T</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>T</mi> </munderover> <msub> <mi>log</mi> <mn>2</mn> </msub> <msup> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <msubsup> <mi>SINR</mi> <mi>R</mi> <mi>i</mi> </msubsup> <mo>)</mo> </mrow> <mi>N</mi> </msup> </mrow> </msup> <mo>-</mo> <mn>1</mn> </mrow>
Wherein, M represents transmitting terminal antenna number, and N represents receiving terminal antenna number；
S3：The channel capacity C of three kinds of antenna modes is calculated respectivelySISO、CTDAnd CSM, calculation formula is：
CSISO=log2(1+SINRSISO)
CTD=log2(1+SINRTD)
CSM=M × log2(1+SINRSM)
S4：Judgement factor alpha is calculated, calculation formula is：
<mrow> <mi>&amp;alpha;</mi> <mo>=</mo> <mfrac> <msub> <mi>C</mi> <mrow> <mi>S</mi> <mi>I</mi> <mi>S</mi> <mi>O</mi> </mrow> </msub> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> <mrow> <mo>(</mo> <msub> <mi>C</mi> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </msub> <mo>,</mo> <msub> <mi>C</mi> <mrow> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow>
S5：If α >=αth, using single antenna pattern；If it is not, then further determine whether CTD≥CSM, if it is, adopting With diversity mode is sent, otherwise using space multiplexing mode.
2. multi-antenna adaptive dispatching method according to claim 1, which is characterized in that the signal-to-noise ratio in step S1Calculation formula be：
<mrow> <msubsup> <mi>SINR</mi> <mi>R</mi> <mi>i</mi> </msubsup> <mo>=</mo> <mfrac> <mrow> <mi>&amp;beta;</mi> <mo>&amp;CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>S</mi> <mi>R</mi> <mi>S</mi> </mrow> </msub> <mo>&amp;CenterDot;</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>Q</mi> </munderover> <msubsup> <mi>p</mi> <mi>c</mi> <mi>j</mi> </msubsup> </mrow> <mrow> <msub> <mi>S</mi> <mi>I</mi> </msub> <mo>+</mo> <msub> <mi>N</mi> <mn>0</mn> </msub> <mi>B</mi> </mrow> </mfrac> </mrow>
Wherein, PSRSThe reception power of district pilots measuring signal (Sound Reference Signal, SRS) where node；For the channel power spectrum of j-th of subcarrier, Q is transmission subcarrier number, and B represents system bandwidth, and β is channel fading coefficient, N0For the power spectral density of interchannel noise, SIRepresent jamming power.
3. multi-antenna adaptive dispatching method according to claim 1, which is characterized in that decision threshold α in step S5th's Value range is 0.85≤αth＜ 1.
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