TWI672510B - Mimo antenna measurement system - Google Patents

Abstract

A multi-input multi-output antenna measuring system comprises a communication device to be tested, a first switch module and a multi-antenna communication quality parameter measuring device. The communication device to be tested includes a plurality of antennas to be tested and a circuit unit. The signal transmission between the standby antenna and the circuit unit is set to be non-conductive. The first switch module is electrically connected between the standby antenna and the multi-antenna communication quality parameter measuring device, and has a plurality of switch branches, each of which has a switch, when the circuit unit is powered on, The control voltages respectively applied to the switches alternately control one of the switches to be turned on, and the remaining switches are not turned on. At this time, the size of a received signal received by the control unit is related to the one generated by the circuit unit. Noise.

Description

Multiple input multiple output antenna measurement system

The present invention relates to a measurement system, and more particularly to a multiple input multiple output antenna measurement system.

Referring to FIG. 1, a conventional method of measuring a wireless communication device such as a mobile phone 11 is to place the mobile phone 11 in an electromagnetic wave shielding room 12, and the shielding room 12 has an analog base station antenna 13 and an analog base station antenna 13 Transmitting and receiving electromagnetic waves related to the simulated communication system (for example, Wifi, 4G), the mobile phone 11 is turned on, and communicates with the analog base station antenna 13, and measures some communication quality parameters of the mobile phone 11, such as total radiation power (TRP). And total omnidirectional sensitivity (TIS), etc.

The disadvantage of this conventional technology is that the obtained communication quality parameter is a comprehensive result of the whole antenna 111 of the mobile phone 11 plus the back-end communication module 112. If the mobile phone 11 has multiple antennas 111 and the communication quality does not conform to the specifications, It is impossible to know which antennas 111 need to be adjusted, and it is impossible to know that each antenna 111 is interfered by the back-end communication module 112. Therefore, it is only possible to use the trial and error method to guess and adjust the measurement, which results in research and development inefficiency. .

Since the known antenna development system has the aforementioned problems, it is necessary to develop an antenna measurement system capable of solving the aforementioned problems to improve the research and development efficiency.

The multi-input multi-output antenna measuring system of the invention comprises an anechoic chamber, a communication device to be tested, a first switch module and a multi-antenna communication quality parameter measuring device.

The communication device to be tested is disposed in the anechoic chamber, and includes a plurality of antennas to be tested and a circuit unit, and the signal transmission between the standby antenna and the circuit unit is set to be non-conductive.

The first switch module has a plurality of switch branches, each switch branch has a first end, a second end, and a switch electrically connected between the first end and the second end The switch is controlled to switch between conducting and non-conducting. When the switch is turned on, the first end and the second end electrically connected to the switch are turned on by the switch. When the switch is not conducting, the switch is turned on. The first end portion and the second end portion of the electrical connection are not electrically connected by the switch, and each antenna to be tested is electrically connected to a corresponding first end portion of the switch branch.

The multi-antenna communication quality parameter measuring device comprises a first transceiver unit and a control unit. The first transceiver unit is electrically connected to the second end of each of the switch branches to receive a received signal from the antenna to be tested, and the control operation unit is electrically connected to the first transceiver unit to calculate the size of the received signal.

When the circuit unit is powered on, a plurality of control voltages respectively applied to the switches alternately control one of the switches to be turned on, and the remaining switches are not turned on. At this time, the received signal y _i calculated by the control unit The size of _=1~n is related to a noise N _i=1~n generated by the circuit unit, which is expressed as follows: Where parameter n is the number of antennas to be tested, and parameter i represents the antenna to be tested numbered i.

Preferably, the control operation unit further records the number corresponding to each antenna to be tested, and the noise corresponding to each number.

Preferably, the MIMO antenna measurement system further includes a plurality of detection antennas and a second switch module. The detection antennas are dispersedly disposed in the anechoic chamber. The second switch module has a plurality of switch branches, each switch branch has a first end, a second end, and a switch electrically connected between the first end and the second end The switch is controlled to switch between conducting and non-conducting. When the switch is turned on, the first end and the second end electrically connected to the switch are turned on by the switch. When the switch is not conducting, the switch is turned on. The first end portion and the second end portion of the electrical connection are not electrically connected by the switch, and each detecting antenna is electrically connected to a corresponding first end portion of the switch branch.

The multi-antenna communication quality parameter measuring device further includes a second transceiver unit electrically connected to the second end of each of the switch branches of the second switch module to provide the j-th detection The antenna-detection signal x _j , j is a continuous positive integer from 1 to m (m>1), and a plurality of control voltages respectively applied to the switches of the second switch module alternately control the switches One is turned on, and the other switches are not turned on. The control unit also calculates a channel parameter matrix H between the detecting antenna and the waiting antenna according to the following formula, as follows: The received signals y _i=1~n , the noises N _i=1~n and the detection signals x _j are known.

Preferably, the control arithmetic unit further utilizes a channel parameter matrix H and a noise matrix. Calculate the channel capacity C as follows: H ^H is the conjugate transposed matrix of the channel parameter matrix H. The parameter SNR _i=1~n is the signal-to-noise ratio calculated by the detection signal and the noise.

Preferably, the number m of the detecting antennas is equal to the number n of the antennas to be tested.

Preferably, the control arithmetic unit further records the channel capacity and the signal to noise ratio.

Preferably, the control operation unit further calculates the condition value (condition(s), K(H)) of a matrix channel by using the calculated channel parameter matrix H for singular value decomposition, and records the condition value of the matrix channel.

Preferably, the first transceiver unit has a wireless transceiver module and a software defined radio module. The wireless transceiver module has a working mode of a transmitter and has a function of modulation and inverse fast Fourier transform (IFFT), and electrically connects the second end of each of the switch branches of the first switch module to provide the Detection signal. The software-defined radio module is electrically connected to the wireless transceiver module, and the software-defined radio module uses the same wireless communication standard as the wireless transceiver module.

Preferably, the second transceiver unit has a wireless transceiver module and a software defined radio module. The wireless transceiver module has a working mode of a receiver and has a function of demodulation and fast Fourier transform (FFT), and electrically connects the second end of each of the switch branches of the second switch module to receive the Receive signals. The software-defined radio module is electrically connected to the wireless transceiver module, and the software-defined radio module uses the same wireless communication standard as the wireless transceiver module.

Preferably, the control arithmetic unit is electrically connected to the software-defined radio modes Group, and capture and record the Error Vector Magnitude (EVM) from each software-defined radio module, the physical layer throughput (PHY Throughput), and the bit error rate of each layer (Bit Error Rate) , BER).

The effect of the invention is that the standby antenna is externally connected to the multi-antenna communication quality parameter measuring device, and the performance of any one of the antennas to be tested can be independently analyzed, and the electromagnetic interference noise generated when the circuit unit is turned on is detected. In turn, the interference is suppressed or the optimal configuration position of the waiting antenna relative to the circuit unit is found, and the control computing unit further records various communication quality parameters, and has the synergistic effect of debugging, measurement and data collection.

11‧‧‧Mobile

111‧‧‧Antenna

112‧‧‧Communication module

12‧‧‧Shielding room

13‧‧‧Analog base station antenna

2‧‧‧ anechoic chamber

3‧‧‧Communication device to be tested

31‧‧‧ antenna to be tested

32‧‧‧ circuit unit

4‧‧‧First switch module

41‧‧‧Switch branch

42‧‧‧First end

43‧‧‧second end

44‧‧‧ switch

5‧‧‧Multi-antenna communication quality parameter measuring equipment

6‧‧‧Detecting antenna

7‧‧‧Second switch module

71‧‧‧Switch branch

72‧‧‧ first end

73‧‧‧second end

74‧‧‧ switch

8‧‧‧First transceiver unit

81‧‧‧Wireless transceiver module

82‧‧‧Software Defined Radio Module

9‧‧‧Control arithmetic unit

10‧‧‧second transceiver unit

101‧‧‧Wireless transceiver module

102‧‧‧Software Defined Radio Module

Figure 1 is a schematic diagram showing a prior art antenna measurement system.

Fig. 2 is a schematic view showing a first preferred embodiment of the multi-input multi-output antenna measuring system of the present invention.

Fig. 3 is a schematic view showing a second preferred embodiment of the multi-input multi-output antenna measuring system of the present invention.

Figure 4 is another schematic view of the second preferred embodiment illustrating an embodiment of a multi-antenna communication quality parameter measuring device.

Referring to FIG. 2, a first preferred embodiment of the multi-input multi-output antenna measurement system of the present invention includes an anechoic chamber 2, a communication device to be tested 3, a first switch module 4, and a multi-antenna communication quality parameter measurement. Device 5.

The appearance of the anechoic chamber 2 is substantially a hollow rectangular parallelepiped, and the interior is affixed with A plurality of electromagnetic wave absorbers (not shown).

The communication device 3 to be tested is disposed in the anechoic chamber 2, and includes a plurality of antennas 31 to be tested and a circuit unit 32. The signal transmission between the standby antenna 31 and the circuit unit 32 is set to be non-conductive.

For example, the communication device to be tested 3 may be a device such as a smart phone or a computer. When the final shipment is made, the waiting antenna 31 is electrically connected to the circuit unit 32. However, in the preferred embodiment, The communication device to be tested 3 is in a research and development stage, and the standby antenna 31 is not electrically connected to the circuit unit 32 during the adjustment test, but is electrically connected to the multi-antenna communication quality parameter measuring device 5 for the purpose of facilitating Engineer measurement analysis.

The first switch module 4 has a plurality of switch branches 41, each of which has a first end portion 42 and a second end portion 43, and is electrically connected to the first end portion 42 and the second portion The switch 44 between the ends 43 is controlled to switch between conduction and non-conduction. When the switch 44 is turned on, the first end portion 42 and the second end portion 43 electrically connected to the switch 44 are transmitted. The switch 44 is turned on. When the switch 44 is not turned on, the first end portion 42 and the second end portion 43 electrically connected to the switch 44 are not electrically connected by the switch 44, and each antenna 31 to be tested is electrically connected to the antenna 41. Corresponding to the first end 42 of the switch branch 41. Each switch 44 is a diode that switches between conducting and non-conducting due to the applied voltage level change.

The multi-antenna communication quality parameter measuring device 5 includes a first transceiver unit 8 and a control unit 9. The first transceiver unit 8 is electrically connected to the second end portion 43 of each of the switch branches 41 to receive a received signal from the antenna 31 to be tested. The control arithmetic unit 9 is electrically connected to the first transceiver unit 8 to calculate the size of the received signal.

When the circuit unit 32 is turned on, a plurality of control voltages respectively applied to the switches 44 alternately control one of the switches 44 to be turned on, and the remaining switches 44 are not turned on, and the control unit 9 calculates the calculated The size of the received signal y _i=1~n is related to a noise N _i=1~n generated by the circuit unit 32, which is expressed as follows: a noise matrix Where parameter n is the number of the antennas 31 to be tested, and parameter i represents the antenna 31 to be tested of number i.

The control operation unit 9 further records the number i (i is a continuous positive integer from 1 to n) corresponding to each antenna 31 to be tested, and the noise N _i corresponding to each number i to adjust the waiting test as an engineer. The position of the antenna 31 and the basis for electromagnetic interference suppression.

For example, the number of the waiting antennas 31 is 4, and when the switch 44 corresponding to the antenna 31 to be tested is turned on, the switches 44 of the waiting antennas 31 of the remaining numbers 2, 3, and 4 are not turned on. Therefore, the antenna 31 to be tested receives the electromagnetic interference (that is, the noise N ₁ ) from the circuit unit 32, so that it can be known whether the antenna 31 to be tested of the number 1 needs to be adjusted, or there is almost no significant miscellaneous Interference, there is no need to adjust. Similarly, the waiting antenna 31 of the numbers 2, 3, and 4 also performs the same test procedure in the antenna 31 to be tested as in the foregoing number 1, and compares the four noises N ₁ , N ₂ , N ₃ , and N _{4 .} Whichever is the largest, it is further known that the electromagnetic interference source (noise N _i ) on the circuit unit 32 is adjacent to which number of the antenna 31 to be tested, thereby achieving the effect of rapid adjustment.

Referring to FIG. 3, the second preferred embodiment of the multi-input multi-output antenna measurement system of the present invention further includes a plurality of detection antennas 6 and a second switch module 7 as compared with the first preferred embodiment. The antenna communication quality parameter measuring device 5 further includes a second transceiver unit 10.

The detecting antennas 6 are dispersed in a plurality of different ones of the anechoic chambers 2 position.

The second switch module 7 has a plurality of switch branches 71. Each switch branch 71 has a first end portion 72 and a second end portion 73, and is electrically connected to the first end portion 72 and the second portion. The switch 74 between the ends 73 is controlled to switch between conduction and non-conduction. When the switch 74 is turned on, the first end portion 72 and the second end portion 73 electrically connected to the switch 74 pass through. The switch 74 is turned on. When the switch 74 is not turned on, the first end portion 72 and the second end portion 73 electrically connected to the switch 74 are not connected by the switch 74, and each detecting antenna 6 is electrically connected to one. Corresponding to the first end 72 of the switch branch 71.

The second transceiver unit 10 is electrically connected to the second end portion 73 of each of the switch branches 71 of the second switch module 7 to provide the j-th detection antenna 6 with a detection signal x _j , j is from 1 To a continuous positive integer of m (m>1), a plurality of control voltages respectively applied to the switches 74 alternately control one of the switches 74 to be turned on, and the remaining switches 74 are not turned on, and the control arithmetic unit 9 further The channel parameter matrix H between the detecting antenna 6 and the waiting antenna 31 is calculated according to the following formula: The received signals y _{i = 1 ~ n} , the noises N _{i = 1 ~ n} and the detected signals x _j are known.

The control arithmetic unit 9 further calculates a channel capacity C by using the channel parameter matrix H and the noise matrix N, as follows: Where H ^H is the conjugate transposed matrix of the channel parameter matrix H, and the parameter SNR _{i = 1 ~ n} is the signal-to-noise ratio calculated using the detection signal and the noise. The control arithmetic unit 9 further records the channel capacity and the signal-to-noise ratio for evaluating the quality of the communication.

For example, when m=n=4, the detecting antennas 6 of the numbers ₁ , ₂ , ₃ , and 4 take turns to output a single output detection signal x ₁ , x ₂ , x ₃ , x ₄ , and 4 The received signals received by the measuring antenna 31 are subtracted from the noises y ₁ -N ₁ , y ₂ -N ₂ , y ₃ -N ₃ , y ₄ -N ₄ , and the 4×4 channels can be measured and measured. The parameter matrix H is as follows:

The channel capacity C is expressed as follows:

The control operation unit 9 further calculates a condition value (K(H)) of a matrix channel by using the calculated channel parameter matrix H for singular value decomposition, and the control operation unit 9 further records the condition of the matrix channel. The value K(H).

Referring to FIG. 4, the first transceiver unit 8 of the multi-antenna communication quality parameter measuring device 5 has a wireless transceiver module 81 and a software-defined radio module 82. The second transceiver unit 10 has a wireless transceiver module. Group 101 and a software defined radio module 102.

The wireless transceiver module 81 of the first transceiver unit 8 has a working mode of a transmitter and has a function of modulation and inverse fast Fourier transform (IFFT), and electrically connects the first opening The second end portion 43 of each of the switch branches 41 of the module 4 is turned off to provide the detection signal. The software-defined radio module 82 of the first transceiver unit 8 is electrically connected to the wireless transceiver module 81, and the software-defined radio module 82 and the wireless transceiver module 81 use the same wireless communication standard.

The wireless transceiver module 101 of the second transceiver unit 10 has a working mode as a receiver, and has a function of demodulation and fast Fourier transform (FFT), and electrically connects each switch branch of the second switch module 7. The second end 73 of the path 71 receives the received signal. The software-defined radio module 102 of the second transceiver unit 10 is electrically connected to the wireless transceiver module 101, and the software-defined radio module 102 and the wireless transceiver module 101 use the same wireless communication standard.

The control computing unit 9 is further electrically connected to the software-defined radio modules 82, 102, and captures and records the error vector magnitude (EVM) from each of the software-defined radio modules 82, 102, and the physical layer. Throughput (PHY Throughput), and bit error rate (BER) of each layer.

In summary, the foregoing preferred embodiment has the following advantages: the standby antenna 31 is externally connected to the multi-antenna communication quality parameter measuring device 5, and the performance of any of the antennas 31 to be tested can be independently analyzed, and the The electromagnetic interference source (referred to as noise) generated by the circuit unit 32 for the standby antenna 31 is adjacent to the antenna 31 to be tested, so that the interference source can be quickly locked and the waiting antenna 31 can be found relative to the circuit unit 32. The optimal position, and the control computing unit 9 further records a plurality of communication quality parameters, and combines debugging, measurement and data collection to solve the disadvantages of the prior art.

However, the above description is only for the embodiments of the present invention, and the scope of the present invention cannot be limited thereto, and the content of the patent application and the contents of the patent specification are all made according to the present invention. The simple equivalent changes and modifications are still within the scope of the invention.

Claims (10)

A multi-input multi-output antenna measuring system comprises: an anechoic chamber; a communication device to be tested, disposed in the anechoic chamber, and comprising a plurality of antennas to be tested and a circuit unit, the waiting antenna and the circuit unit The signal transmission between the two is set to be non-conducting; a first switching module has a plurality of switching branches, each of the switching branches has a first end, a second end, and an electrical connection to the first end And a switch between the second end portion, the switch is controlled to switch between conducting and non-conducting, and when the switch is turned on, the first end and the second end electrically connected to the switch are turned on through the switch When the switch is not turned on, the first end portion and the second end portion electrically connected to the switch are not electrically connected by the switch, and each antenna to be tested is electrically connected to a corresponding first branch of the switch branch. And a multi-antenna communication quality parameter measuring device comprising a first transceiver unit and a control computing unit, the first transceiver unit electrically connecting the second end of each of the switch branches to receive the antenna from the antenna to be tested a receive signal The control arithmetic unit is electrically connected to the first transceiver unit to calculate the size of the received signal. When the circuit unit is powered on, a plurality of control voltages respectively applied to the switches alternately control one of the switches to be turned on, and the rest The switch is not turned on. At this time, the size of the received signal y _{i =1~n} calculated by the control unit is related to a noise N _{i =1~n} generated by the circuit unit, which is expressed as follows: Where parameter n is the number of antennas to be tested, and parameter i represents the antenna to be tested numbered i . According to the multi-input multi-output antenna measuring system of claim 1, wherein the control unit further records the number corresponding to each antenna to be tested, and the noise corresponding to each number. The multi-input multi-output antenna measuring system according to claim 1 of the patent application scope, further comprising: a plurality of detecting antennas dispersedly disposed in the anechoic chamber; and a second switching module having a plurality of switching branches, each A switch branch has a first end, a second end, and a switch electrically connected between the first end and the second end, the switch being controlled to switch between conducting and non-conducting, When the switch is turned on, the first end portion and the second end portion electrically connected to the switch are turned on by the switch, and when the switch is not turned on, the first end portion and the second end portion of the switch are electrically connected Because the switch is isolated and not turned on, each detecting antenna is electrically connected to a corresponding first end of the switch branch, and the multi-antenna communication quality parameter measuring device further includes a second transceiver unit, the second transceiver The unit is electrically connected to the second end of each of the switch branches of the second switch module to provide the j-th detecting antenna. The detecting signal x _j , j is continuous from 1 to m (m>1) a positive integer, a plurality of controls respectively applied to the switches of the second switch module Voltage control of the switches in turn one of which is turned on, the remaining switches are not turned on, the control parameter calculation unit further channel matrix H according to the following equation between these antennas and detection of such an antenna to be tested, the following formula: The received signals y _{i =1~n} , the noises N _{i =1~n} and the detection signals x _j are known. According to the third application of the patent scope of the input multi-output antenna measurement system, wherein the control operation unit further calculates a channel capacity C by using the channel parameter matrix H and the noise matrix N, as follows: H ^H is the conjugate transposed matrix of the channel parameter matrix H. The parameter SNR _{i = 1 ~ n} is the signal-to-noise ratio calculated by the detection signal and the noise. The multi-input multi-output antenna measurement system according to the fourth application of the patent application, wherein the control operation unit further records the channel capacity and the signal-to-noise ratio. The input multi-output antenna measurement system according to item 3 of the patent application scope, wherein the number m of the detection antennas is equal to the number n of the antennas to be tested. The multi-input multi-output antenna measurement system according to item 3 of the patent application scope, wherein the control operation unit further utilizes the calculated channel parameter matrix H A singular value decomposition calculation is performed to obtain a conditional value of a matrix channel. The input multi-output antenna measuring system according to claim 7 of the patent application scope, wherein the control arithmetic unit further records the condition value K(H) of the matrix channel. The multi-input multi-output antenna measurement system according to claim 3, wherein the first transceiver unit has: a wireless transceiver module, the working mode is a transmitter and has modulation and inverse fast Fourier transform (IFFT) And electrically connecting the second end of each of the switch branches of the first switch module to provide the detection signal; and a software-defined radio module electrically connecting the wireless transceiver module, and the software Defining that the radio module uses the same wireless communication standard as the wireless transceiver module; the second transceiver unit has: a wireless transceiver module, the working mode is a receiver and has demodulation and fast Fourier transform (FFT) And electrically connecting to the second end of each of the switch branches of the second switch module to receive the received signal; and a software-defined radio module electrically connecting the wireless transceiver module, and the software definition The radio module uses the same wireless communication standard as the wireless transceiver module. The multi-input multi-output antenna measurement system according to claim 9 of the patent application scope, wherein the control operation unit is further electrically connected to the software-defined radio modules, and captures and records the error direction from each software-defined radio module Error Vector Magnitude (EVM), physical layer throughput (PHY Throughput), and bit error rate (BER) of each layer.