CN106230527B - One kind being used for multi-input multi-ouput channel test method and device - Google Patents
One kind being used for multi-input multi-ouput channel test method and device Download PDFInfo
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- CN106230527B CN106230527B CN201610607646.5A CN201610607646A CN106230527B CN 106230527 B CN106230527 B CN 106230527B CN 201610607646 A CN201610607646 A CN 201610607646A CN 106230527 B CN106230527 B CN 106230527B
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Abstract
The present invention provides a kind of method and apparatus for multi-input multi-ouput channel test, this method comprises: power splitter number, channel simulator number, combiner number needed for determining channel test according to the input port number and output port number of base station output mouth number, terminal input port number and channel simulator；Utilize the input port of power splitter connection base station output port and channel simulator, using the output port and terminal input port of combiner connecting channel simulator, so that the output signal of each base station output mouth reaches all terminal input ports after passing through power splitter, channel simulator, combiner.It does not need to carry out the interactive accurate performance test that can be realized as under extensive antenna configuration of high-speed figure between channel simulator using the present invention.
Description
Technical field
The present invention relates to fields of communication technology, in particular to a kind of to be used for multiple-input and multiple-output (Multiple-Input
Multiple-Output, MIMO) channel test method and apparatus.
Background technique
MIMO technology refers to uses multiple transmitting antennas and receiving antenna in transmitting terminal and receiving end respectively, passes through signal
The transmission of the mutiple antennas of transmitting terminal and receiving end and reception, so as to improve communication quality.It can make full use of space resources, pass through
Mutiple antennas realizes multiple-input multiple-output, in the case where not increasing frequency spectrum resource and antenna transmission power, can increase exponentially and is
System channel capacity, the core technology for showing apparent advantage, being considered as forth generation (4G) mobile communication.
By taking the 4G mobile system TD-LTE (time division duplex-long term evolution) of China Mobile's commercialization as an example, base station is mostly used 8 days
Line configuration, terminal are received using 2 antennas.Use space multiplexing technology, base station can be sent out in identical time domain and frequency domain resource
2 data flows are sent, peak rate is promoted 2 times.In order to further enhance spectrum efficiency and order of diversity, 3GPP (third generation partner
Plan) configuration frame of more multi-emitting and receiving antenna is defined, antenna for base station increases to 32,64 for from original 8
Or 128.Terminal antenna will also increase to 4 or 8.
MIMO performance test uses channel simulator, and channel simulator is connected to tested base station and terminal by RF cable
Between.The downlink signal of base station RRU (radio frequency remoto module) transmitting enters channel simulator, broadcasts in signal experience channel simulator
After the channel impulse response for putting down row large-scale fading and multipath fading, it is sent to terminal receiving antenna；The uplink of terminal is sent out
Penetrate signal and enter channel simulator, if tdd systems, then uplink and downlink channel exchanges, if frequency division duplex system, then on
Down channel center frequency point is different.Uplink signal feeds back to the receiving end RRU into channel fading is crossed.
It is influenced by size, price, internal components transmission rate, current separate unit channel simulator product is only supported most
The two-way test that big 16 hair 4 is received.The performance test of 64 or 128 antennas of facing the future needs the cascade of more channel simulators to complete,
And then need to connect by high speed digital interface (100Gbps rank) between channel simulator, complete channel relevancy modeling.So
And it is currently limited by interface rate, when antenna is more than 32, it is difficult to carry out high-speed figure interaction between channel simulator.
Summary of the invention
In view of this, the purpose of the present invention is to provide one kind to be used for multi-input multi-ouput channel test method and device,
It does not need to carry out the interactive accurate performance test that can be realized as under extensive antenna configuration of high-speed figure between channel simulator.
In order to achieve the above object, the present invention provides the following technical scheme that
A method of it is tested for multi-input multi-ouput channel, this method comprises:
According to the input port number and output end of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number, combiner number needed for mouth number determines channel test；
Using the input port of power splitter connection base station output port and channel simulator, combiner connecting channel mould is utilized
The output port and terminal input port of quasi- device, so that the output signal of each base station output mouth passes through power splitter, channel
All terminal input ports are reached after simulator, combiner.
A kind of device for multi-input multi-ouput channel test, which includes: computing unit, control unit；
The computing unit, for according to the defeated of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for inbound port number and output port number determine channel test, combiner number；
Described control unit, for the input port using power splitter connection base station output port and channel simulator, benefit
With the output port and terminal input port of combiner connecting channel simulator, so that the output signal of each base station output mouth
By reaching all terminal input ports after power splitter, channel simulator, combiner.
As can be seen from the above technical solution, in the present invention, the power splitter letter that base station output mouth and test is required is utilized
The input port of road simulator connects, using combiner that the output port of the channel simulator needed for testing and terminal is defeated
Inbound port connects, so that the signal of base station output mouth is by reaching all ends after power splitter, channel simulator, combiner
Input port is held, since each terminal input port can receive all base station output mouths outputs and merge through combiner
Signal afterwards, therefore terminal can use the signal that each input port receives to extrapolate each base station output mouth and issue
Original signal, so that the original signal extrapolated be utilized to execute the operations relevant to channel performance test such as record handling capacity.
As can be seen that applying method of the invention, not needing the progress high-speed figure interaction between channel simulator can be realized as advising greatly
Accurate performance test under mould antenna configuration.
Detailed description of the invention
Fig. 1 is the method flow diagram that the embodiment of the present invention is used for multi-input multi-ouput channel test；
Fig. 2 is the topological diagram that the embodiment of the present invention connects base station and terminal using power splitter, channel simulator with combiner；
Fig. 3 is structural schematic diagram of the embodiment of the present invention for the device of multi-input multi-ouput channel test.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing and according to embodiment,
Technical solution of the present invention is described in detail.
In the present invention, base station output mouth is connected with terminal input port using power splitter, channel simulator, combiner
Get up, so that from the original signal that base station output mouth exports, to often after power splitter, channel simulator and combiner
A terminal input port allows terminal to extrapolate each base station output based on the signal received in each terminal input port
The original signal of port output, and then record handling capacity and obtain the channel performance between base station and terminal accordingly.
It is described in detail below with reference to Fig. 1:
It is the method flow diagram that the embodiment of the present invention is used for multi-input multi-ouput channel test referring to Fig. 1, Fig. 1, such as Fig. 1 institute
Show, this method mainly comprises the steps that
Step 101, according to the input port number of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for determining channel test with output port number, combiner number.
In the present embodiment, according to the input port of base station output mouth number, terminal input port number and channel simulator
Channel simulator number needed for several and output port number determines channel test method particularly includes: calculation base station output port number M
With the quotient α of the input port number P of channel simulatorWith the output of terminal input port number N and channel simulator
The quotient β of port number QChannel simulator number needed for the product of α and β is determined as channel test.
In addition, the quantity of power splitter is determined by base station output mouth number, the quantity of combiner is determined by terminal input port number
Fixed, base station output mouth number is M, and terminal input port number is N, then needs M power splitter and N number of combiner.
According to the input port number and output end of base station output mouth number, terminal input port number and channel simulator
After power splitter number, channel simulator number, combiner number needed for mouth number determines channel test, need further according to average mark
The principle matched is grouped base station output mouth, total to organize the input port that number is base station output mouth number M and channel simulator
The quotient α of number P, the base station output mouth number in every group are the input port number P of channel simulator.
After being grouped to base station output mouth, it is also necessary to letter needed for distributing one group of test for each group of base stations output port
Road simulator, the quotient β of the output port number Q of the number terminal input port number N and channel simulator of this group of channel simulator.
Step 102, the input port that base station output port and channel simulator are connected using power splitter, are connected using combiner
The output port and terminal input port of channel simulator are connect, so that the output signal of each base station output mouth passes through function point
All terminal input ports are reached after device, channel simulator, combiner.
In the present embodiment, each base station output mouth requires connect to as the base station output mouth own base station output end
It is the number of one group of channel simulator that each group of base stations output port distributes is β on all channel simulators of mouthful group distribution, because
This needs 1 point of β power splitter for each base station output mouth, realizes that a base station output mouth connects multiple moulds
The input port of quasi- device.
The input port of base station output port and channel simulator is connected using power splitter method particularly includes: for each
Base station output mouth selects one from each channel simulator distributed for the base station output mouth own base station output port group
The base station output mouth is connected to each input port of selection using power splitter by input port.Base station output mouth, function point
The specific connection method of device, channel simulator are as follows: the base station output mouth is connected to the input port of power splitter, the β of power splitter
A exit port is connected respectively to the β input port selected from β simulator.
In the present embodiment, it is desirable that the output signal of all base station output mouths is input to each end after combiner merges
Input port is held, therefore each terminal input port corresponds to a combiner, while also needed from for each group of base stations output end
A channel simulator is selected in one group of channel simulator of mouth distribution, an output port of the channel simulator is connected to
On the combiner, so that the output signal of all base station output mouths, which can finally be changed after combiner merges, is input to this
Terminal input port.
Therefore, the output port of combiner connecting channel simulator and terminal input port are utilized method particularly includes: needle
To each terminal input port, a channel simulation is selected from the one group of channel simulator distributed for each group of base stations output port
All output ports selected are connected to the terminal input port using combiner by one output port of device.
The input port number of combiner is identical as total group of number of base station output mouth, is α, from for α group base station output mouth
Select the output port of α channel simulator in the α group channel simulator of distribution, α channel output mouth respectively with combiner
α input port be connected, the output port of combiner is connected with a terminal input port.
In embodiments of the present invention, it tests between required all channel simulators and needs through synchronous cable cascade；Letter
Only need to realize that the clock between channel simulator is synchronous between road simulator based on cascade synchronous cable, but do not need into
The interaction of row high-speed data.
In addition, from that can have one between the amplitude and phase between the signal that the different output port of same power splitter exports
Fixed deviation needs to carry out the compensation of amplitude and phase, moreover, signal is entering channel via the input port of channel simulator
Simulator, and during being transferred to from the input port of channel simulator the output port of channel simulator, will also result in
The variation of the phase and amplitude of signal, generate phase and amplitude error, for this reason, it may be necessary to from signal from power splitter export and it is final
The deviation for reaching the phase and amplitude that generate in the transmission process of the output port of channel simulator compensates, specifically: it is right
The amplitude and phase that the signal of the output port of each channel simulator is exported and be transferred to via same power splitter compensate, with
Make to be output to the output end of each channel simulator via same power splitter when channel simulator is set as additive white Gaussian noise
The amplitude and phase of the signal of mouth are all the same, and specific compensating operation can be executed by channel simulator, and compensation method can be used
The prior art.
Same reason, the signal exported from same channel simulator are transferred to the input port of each combiner, and via
During combiner reaches the output port of combiner, the phase and amplitude of signal can also generate phase and amplitude error, be
This, it is also desirable to the deviation of the signal phase and amplitude that generate during this is compensated, specifically: to via same channel
The amplitude and phase that the output port of simulator exported and be transferred to the signal of the output port of each combiner compensate, so that
The amplitude and phase that the signal of the output port of each combiner is output to via the output port of same channel simulator are all the same.
According to the method for the embodiment of the present invention shown in Fig. 1, base station is exported using power splitter, channel simulator, combiner
After port and terminal input port connect, so that it may execute the channel test between base station and terminal, carry out letter below
The schematic illustration of road test:
(1) signal for assuming a base station output mouth of m (m=1,2 ..., M) is xm, terminal n-th (n=1,2 ..., N)
The signal of a input port is yn, the noise of n-th of terminal input port is σn, base station output mouth m and terminal input port n
Between, the channel impulse response comprising large scale and multipath fading by channel simulator simulation is hn,m, then exported from base station
There are the relationships that following formula one describes between the signal of port output and the signal for being input to terminal input port:
In above-mentioned formula one,For base station output mouth and terminal input port it
Between channel impulse response matrix, include the channel impulse response of α × β channel simulator in the channel impulse response matrix
Matrix.
Wherein, the channel impulse response matrix simulated in k-th of channel simulator can be described with following formula two:
In above-mentioned formula two,
It indicating to be rounded downwards, mod expression takes the remainder operation, and indicates multiplying ,/indicate division arithmetic.
For channel simulator k input port p (p=1,2, ..., P) with output port q
(q=1,2, ..., Q) between the channel impulse response simulated namely base station input port m (value of m are as follows:)
Between terminal input port n (value of n are as follows: (k-1) PmodM+p), by channel simulator simulation comprising large scale and
The channel impulse response of multipath fading.
The input terminal of k-th of channel simulator is sequentially ingressed into the output signal of base station RRUAddition is made an uproar
Sound isTherefore, the signal of q-th of output port of k-th of channel simulator
(2) channel simulator output port is combined: by theExtremelyTotal α channel simulator
The port (n-1) modQ+1 is combined using high-precision combiner, is input to terminal n-th (n=1,2 ... N) a input port, then
The input signal of n-th of port of terminal
(3) performance test: it is synchronous using clock between channel simulator, while playback channels impulse response is (defeated in base station
Channel impulse response between exit port m to terminal input port n is hn,m).Base station downlink signal passes through multiple channel simulators
Into terminal, downstream data traffic is initiated, terminal assesses base station and terminal in multiple-input and multiple-output day by record handling capacity
Channel performance under line configuration.
2 couples of present invention are illustrated with reference to the accompanying drawing.
By taking TD-LTE-A system as an example, base station output mouth number be 8, terminal use 4 antennas (namely terminal input interface for
4).In order to detect the performance of base station and terminal under fading channel, channel simulator need to have 8 input ports, 4 output ends
Mouthful.And practical low side channel simulator product only supports 4 input ports and 2 output ports.
The method according to the invention can be cascaded by multiple channel simulators and support downlink performance test, and channel simulation
Without digital baseband interaction between device.Detailed process is as follows:
First, it determines the quantity of the channel simulator, power splitter, combiner that need, and utilizes power splitter, channel simulation
Device, combiner connect base station output mouth and terminal input port:
Due to base station output mouth number M=8, terminal input port number N=4, the maximum input port number of channel simulator
For P=4, maximum output port number is Q=2.Therefore the input of base station output mouth number M and channel simulator can be calculated
Quotient β=2 of the output port number Q of quotient α=2 of port number P, terminal input port number N and channel simulator, it is possible thereby to determine
Channel simulator number needed for test is α × β=4.In addition, the power splitter number that test needs is base station output mouth number M, survey
The combiner that examination needs is terminal input port number N.
Base station output mouth is divided into 2 groups, wherein first group of base station output mouth includes base station output mouth 1,2,3,4,
Second group of base station output mouth includes base station output mouth 5,6,7,8.
Between base station and channel simulator, connection type is as follows:
One group of channel simulator (including channel simulator 1,3) is distributed for first group of base station output mouth, it is high using 1 point 2
Precision power splitter connects the input port of first group of base station output mouth and this group of channel simulator, specific as shown in Fig. 2, packet
It includes: utilizing the input port 1 of 1 point of 2 high-precision power splitter connection base station output port 1 and channel simulator 1,3；It is high using 1 point 2
The input port 2 of precision power splitter connection base station output port 2 and channel simulator 1,3；Connected using 1 point of 2 high-precision power splitter
Connect the input port 3 of base station output mouth 3 and channel simulator 1,3；Base station output is connected using 1 point of 2 high-precision power splitter
The input port 4 of mouth 4 and channel simulator 1,3.
It is high-precision using 1 point 2 that one group of channel simulator (including channel simulator 2,4) is distributed for second group of base station output mouth
The input port that power splitter connects second group of base station output mouth and this group of channel simulator is spent, is specifically included: being utilized 1 point 2 high
The input port 1 of precision power splitter connection base station output port 5 and channel simulator 1,3；Connected using 1 point of 2 high-precision power splitter
Connect the input port 2 of base station output mouth 6 and channel simulator 1,3；Base station output is connected using 1 point of 2 high-precision power splitter
The input port 3 of mouth 7 and channel simulator 1,3；Utilize 1 point of 2 high-precision power splitter connection base station output port 8 and channel simulation
The input port 4 of device 1,3.
Each base station output mouth is connected to the input port of 1 point of 2 high-precision power splitter, defeated by adjusting channel simulator
The preset amplitude and phase of inbound port calibrate 2 signal paths that 1 point of 2 high-precision power splitter separates, and guarantee 2 letters
The complete phase of amplitude, phase for the input signal that the input port for the channel simulator that number access passes through is received in synchronization
Together.
Between terminal and channel simulator, connection type is as follows:
The output port 1 that channel simulator 1 is selected in the channel simulator distributed for first group of base station output mouth,
For the output port 1 for selecting channel simulator 2 in the channel simulator of second group of base station output mouth distribution, the channel that will be selected
The output port 1 of simulator 1 and the output port 1 of channel simulator 2 are connected to terminal input port by high-precision combiner
1。
The output port 2 that channel simulator 1 is selected in the channel simulator distributed for first group of base station output mouth,
For the output port 2 for selecting channel simulator 2 in the channel simulator of second group of base station output mouth distribution, the channel that will be selected
The output port 2 of simulator 1 and the output port 2 of channel simulator 2 are connected to terminal input port by high-precision combiner
2。
The output port 1 that channel simulator 3 is selected in the channel simulator distributed for first group of base station output mouth,
For the output port 1 for selecting channel simulator 4 in the channel simulator of second group of base station output mouth distribution, the channel that will be selected
The output port 1 of simulator 3 and the output port 1 of channel simulator 4 are connected to terminal input port by high-precision combiner
3。
The output port 2 that channel simulator 3 is selected in the channel simulator distributed for first group of base station output mouth,
For the output port 2 for selecting channel simulator 4 in the channel simulator of second group of base station output mouth distribution, the channel that will be selected
The output port 2 of simulator 3 and the output port 2 of channel simulator 4 are connected to terminal input port by high-precision combiner
4。
So far, base station output mouth has been connected with terminal input port using power splitter, channel simulator and combiner
Come, communication channel needed for setting up simulation test in base station and terminal.
Next, can be based on the down channel performance between above-mentioned connecting test base station and terminal.
According to formula one, in Fig. 2 between the signal of base station output mouth output and the signal of input terminal input port
Input and output formula can be written as
The corresponding matrix of channel impulse simulated in a channel simulator of kth (k=1,2 ..., 4) isWherein,For the defeated of channel simulator k
The channel impulse response simulated between inbound port p (p=1,2 ..., 4) and output port q (q=1,2).
In the input port side of channel simulator, the input port of channel simulator k is sequentially ingressed into base station output mouth
Output signal isIf the noise of addition isThen q-th of output end of channel simulator k
The signal of mouth
In the output port side of channel simulator, signal combining is executed: by theExtremelyTotally 2
The port (n-1) mod2+1 of channel simulator is combined using high-precision combiner, and being input to terminal n-th, (n=1,2 ... is 4) a
Input port, the input signal of n-th of port of terminal
Signal, the channel mould of the input port of output signal, input channel simulator based on above-mentioned base station output mouth
Signal, the signal of input terminal input port and the analysis of correlation and description of quasi- device output port output, Ke Yishi
Now to the performance test of down channel: it is synchronous using clock between channel simulator, while playback channels impulse response (base station letter
Number different large scales and multipath fading are undergone in channel simulator, so that between base station output mouth and terminal input port
Channel impulse response it is also different).Base station downlink signal enters terminal by multiple channel simulators, initiates downlink data
Business, terminal assess the performance of base station and terminal under multi-input/output antenna configuration by the handling capacity of record, specifically
Appraisal procedure the prior art can be used.
From the principle and illustration of the above-mentioned method tested for multi-input multi-ouput channel the embodiment of the present invention
As can be seen that the invention has the following advantages that (1) only needs entirely to test using basic radio-frequency devices combiner and power splitter
System connection is simple.(2) channel simulator design complexities are substantially reduced without increasing high speed digital interface between channel simulator
And cost.(3) present invention performance test concurrent suitable for downlink and uplink or uplink and downlink, and how defeated can be used for a variety of multi outputs
System out, such as LTE system, TDD system and FDD system etc..(4) present invention can theoretically support the transmission of unlimited root and connect
Antenna configuration is received, and multi-terminal parallel can be supported to test.(5) it proves after tested, using method of the invention to channel simulator
Input port signal calibrated after, channel performance test measuring accuracy it is identical as the scheme for being applicable in high speed digital interface.
The method to the embodiment of the present invention for multi-input multi-ouput channel test is described in detail above, and combines
Channel test process is described in specific example, and the present invention also provides one kind to test for multi-input multi-ouput channel
Device, be described in detail below in conjunction with Fig. 3.
It is structural schematic diagram of the embodiment of the present invention for the device of multi-input multi-ouput channel test referring to Fig. 3, Fig. 3,
As shown in figure 3, the device includes: computing unit 301, control unit 302；Wherein,
Computing unit, for the input terminal according to base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number, combiner number needed for mouth number and output port number determine channel test；
Control unit utilizes conjunction for the input port using power splitter connection base station output port and channel simulator
The output port and terminal input port of road device connecting channel simulator, so that the output signal of each base station output mouth is logical
All terminal input ports are reached after crossing power splitter, channel simulator, combiner.
In Fig. 3 shown device,
The computing unit 301, according to the defeated of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for inbound port number and output port number determine channel test, after combiner number, into one
Step is used for: being grouped to base station output mouth, and is channel simulation needed for the one group of test of distribution of each group of base stations output port
Device；
Described control unit 302 is used when using the input port of power splitter connection base station output port and channel simulator
In: it is directed to each base station output mouth, from each channel simulation distributed for the base station output mouth own base station output port group
An input port is selected in device, which is connected to each input port of selection using power splitter；
Described control unit 302, using combiner connecting channel simulator output port and terminal input port when, use
In: it is directed to each terminal input port, a letter is selected from the one group of channel simulator distributed for each group of base stations output port
All output ports selected are connected to the terminal input port using combiner by one output port of road simulator.
In Fig. 3 shown device,
The computing unit 301, according to the defeated of base station output mouth number, terminal input port number and channel simulator
When power splitter number, channel simulator number needed for inbound port number and output port number determine channel test, combiner number, it is used for:
Base station output mouth number is determined as to test required power splitter number；It is determined as terminal input port number to test required combining
Device number；The quotient α and terminal input port number N and letter of the input port number P of calculation base station output port number M and channel simulator
The quotient β of the output port number Q of road simulator, channel simulator number needed for the product of α and β is determined as channel test；
The computing unit 301, is grouped base station output mouth, and distributes one group of survey for each group of base stations output port
It when channel simulator needed for examination, is used for: base station output mouth is divided into α group according to the principle of mean allocation, be each group of base stations
Output port distributes one group of channel simulator being made of β channel simulator.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (6)
1. a kind of method for multi-input multi-ouput channel test, which is characterized in that this method comprises:
According to the input port number and output port number of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for determining channel test, combiner number；
Using the input port of power splitter connection base station output port and channel simulator, combiner connecting channel simulator is utilized
Output port and terminal input port so that the output signal of each base station output mouth passes through power splitter, channel simulation
All terminal input ports are reached after device, combiner；
Wherein,
According to the input port number and output port number of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for determining channel test after combiner number, further comprise: to base station output
Mouth is grouped, and is channel simulator needed for the one group of test of distribution of each group of base stations output port；
Utilize the method for the input port of channel simulator needed for power splitter connection base station output port and test are as follows: for every
A base station output mouth selects one from each channel simulator distributed for the base station output mouth own base station output port group
The base station output mouth is connected to each input port of selection using power splitter by a input port；
Utilize the method for the output port and terminal input port of channel simulator needed for combiner connecting test are as follows: for every
A terminal input port selects a channel simulator from the one group of channel simulator distributed for each group of base stations output port
All output ports selected are connected to the terminal input port using combiner by one output port.
2. the method according to claim 1, wherein
According to the input port number and output port number of base station output mouth number, terminal input port number and channel simulator
The method of power splitter number, channel simulator number, combiner number needed for determining channel test are as follows:
Base station output mouth number is determined as to test required power splitter number；
Terminal input port number is determined as to test required combiner number；
The quotient α and terminal input port number N and channel of the input port number P of calculation base station output port number M and channel simulator
The quotient β of the output port number Q of simulator, channel simulator number needed for the product of α and β is determined as channel test；
Base station output mouth is grouped, and is channel simulator needed for the one group of test of distribution of each group of base stations output port
Method are as follows: base station output mouth is divided into α group according to the principle of mean allocation, is believed for the distribution of each group of base stations output port by β
One group of channel simulator of road simulator composition.
3. the method according to claim 1, wherein
Channel simulator needed for test passes through synchronous cable cascade；
Realize that the clock between channel simulator is synchronous based on cascade synchronous cable between channel simulator.
4. according to the method described in claim 3, it is characterized in that,
The amplitude and phase of the signal for the output port that each channel simulator is exported and be transferred to via same power splitter are carried out
Compensation, so as to be output to each channel simulator via same power splitter when channel simulator is set as additive white Gaussian noise
Output port signal amplitude and phase it is all the same；
The amplitude of the signal of the output port of each combiner is exported and is transferred to the output port via same channel simulator
It is compensated with phase, so as to be output to the signal of the output port of each combiner via the output port of same channel simulator
Amplitude and phase it is all the same.
5. a kind of device for multi-input multi-ouput channel test, which is characterized in that the device includes: computing unit, control
Unit；
The computing unit, for the input terminal according to base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number, combiner number needed for mouth number and output port number determine channel test；
Described control unit utilizes conjunction for the input port using power splitter connection base station output port and channel simulator
The output port and terminal input port of road device connecting channel simulator, so that the output signal of each base station output mouth is logical
All terminal input ports are reached after crossing power splitter, channel simulator, combiner；
Wherein,
The computing unit, according to the input port number of base station output mouth number, terminal input port number and channel simulator
Power splitter number, channel simulator number needed for determining channel test with output port number after combiner number, are further used for:
Base station output mouth is grouped, and is channel simulator needed for the one group of test of distribution of each group of base stations output port；
Described control unit is used for: being directed to when using the input port of power splitter connection base station output port and channel simulator
Each base station output mouth is selected from each channel simulator distributed for the base station output mouth own base station output port group
The base station output mouth is connected to each input port of selection using power splitter by one input port；
Described control unit, using combiner connecting channel simulator output port and terminal input port when, be used for: being directed to
Each terminal input port selects a channel simulator from the one group of channel simulator distributed for each group of base stations output port
An output port, all output ports selected are connected to the terminal input port using combiner.
6. device according to claim 5, which is characterized in that
The computing unit, according to the input port number of base station output mouth number, terminal input port number and channel simulator
When power splitter number, channel simulator number needed for determining channel test with output port number, combiner number, it is used for: base station is defeated
Exit port number is determined as testing required power splitter number；Terminal input port number is determined as to test required combiner number；Meter
Calculate the quotient α and terminal input port number N and channel simulator of the input port number P of base station output mouth number M and channel simulator
Output port number Q quotient β, channel simulator number needed for the product of α and β is determined as channel test；
The computing unit is grouped base station output mouth, and distributes needed for one group of test for each group of base stations output port
Channel simulator when, be used for: base station output mouth be divided into α group according to the principle of mean allocation, be each group of base stations output end
One group of channel simulator that mouth distribution is made of β channel simulator.
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