Signal sending method for terminal device and terminal device

1. A Multiple Input Multiple Output (MIMO) Over The Air (OTA) performance test system, comprising a base station simulator, a channel emulator, and a terminal device, wherein:

the base station simulator is configured to send multiple streams of downlink test signals to a channel emulator through multiple downlink ports;

the channel emulator is configured to:

perform channel emulation processing on the multiple streams of received downlink test signals according to a complex number pattern of each multiple receive antennas of a terminal device, a downlink radiation channel inverse matrix, and a specified downlink channel fading model, and

send the multiple streams of processed downlink test signals to the terminal device in an anechoic chamber by using multiple downlink antennas in the anechoic chamber; and

the terminal device is configured to:

receive, by using the multiple receive antennas, the multiple streams of processed downlink test signals sent by the channel emulator, and

feedback an acknowledgement message to the base station simulator according to each stream of received processed downlink test signal, wherein the acknowledgement message fed back according to the stream of processed downlink test signal includes information for facilitating notifying the base station simulator whether the terminal device correctly demodulates the processed downlink test signal, wherein

the base station simulator is further configured to determine a downlink throughput of the terminal device according to a quantity of streams of downlink test signals that are sent and a quantity of pieces of acknowledgement information, among received acknowledgement messages, indicating that the terminal device performs correct demodulation and the system further comprises at least a first signal analyzer configured to determine the complex number pattern of each receive antenna; and

the channel emulator is further configured to obtain the complex number pattern of each receive antenna from the first signal analyzer, and

the terminal device is further configured to sequentially transmit a monophonic signal according to a specified sequence by using all of the multiple receive antennas; and

the first signal analyzer is configured to perform the following for each receive antenna:

separately measuring amplitudes and phases of the monophonic signal on an in-phase I channel and a quadrature Q channel in each measurement direction of a three-dimensional radiation spherical surface, wherein the monophonic signal is transmitted by the receive antenna; and

obtaining the complex number pattern of the receive antenna according to the amplitudes and the phases, obtained by means of measurement specific to the receive antenna, on the I channel and the Q channel in each measurement direction of the three-dimensional radiation spherical surface.

2. The system of claim 1 , wherein the system further comprises:

a second signal analyzer, configured to determine a downlink radiation channel matrix of the terminal device; and

a first processing device, configured to obtain the downlink radiation channel matrix from the second signal analyzer, and calculate an inverse matrix of the downlink radiation channel matrix to obtain a downlink radiation channel inverse matrix, wherein

the channel emulator is further configured to obtain the downlink radiation channel inverse matrix from the first processing device.

3. The system according to claim 2 , wherein

the terminal device is further configured to: determine a smaller value n between a quantity of receive antennas of the terminal device and a quantity of downlink ports of the base station simulator, select n receive antennas from the multiple receive antennas, and sequentially transmit the monophonic signal according to a specified sequence by using all of the n receive antennas; and

the second signal analyzer is configured to:

when the terminal device transmits the monophonic signal through each receive antenna, separately connect to n downlink antennas in the anechoic chamber, and measure a signal received by each of the n downlink antennas;

generate a signal vector for each receive antenna according to the signals measured from the n downlink antennas; and

generate the downlink radiation channel matrix according to the generated signal vector for each of the n receive antennas.

4. The system of claim 1 , wherein the first signal analyzer is further configured to:

after determining the complex number pattern of each of the multiple receive antennas of the terminal device, determine, according to complex number patterns of any two of the multiple receive antennas, an antenna envelope correlation coefficient of the two receive antennas.

5. A Multiple Input Multiple Output (MIMO) Over The Air (OTA) performance test system, comprising:

a terminal device in an anechoic chamber, configured to transmit multiple streams of uplink test signals by using multiple transmit antennas of the terminal device, and transmit the multiple streams of uplink test signals to a channel emulator through multiple uplink antennas in the anechoic chamber;

the channel emulator, configured to perform channel emulation processing on the multiple streams of uplink test signals according to a complex number pattern of each of the multiple transmit antennas of the terminal device, the uplink radiation channel inverse matrix, and a specified uplink channel fading model, and send the multiple streams of processed uplink test signals to a base station simulator;

the base station simulator, configured to receive, through multiple uplink ports, the multiple streams of processed uplink test signals that are sent by the channel emulator, and determine an uplink throughput of the terminal device according to a quantity of streams of uplink test signals that are sent by the terminal device and a quantity of streams of processed uplink test signals that are received by the base station simulator, and

a third signal analyzer, configured to determine the complex number pattern of each transmit antenna; and

the channel emulator is further configured to obtain the complex number pattern of each transmit antenna from the third signal analyzer,

wherein the terminal device is further configured to sequentially transmit a monophonic signal according to a specified sequence by using all of the multiple transmit antennas; and

the third signal analyzer is configured to perform the following operations for each transmit antenna:

separately measuring amplitudes and phases of the monophonic signal on an in-phase I channel and a quadrature Q channel in each measurement direction of a three-dimensional radiation spherical surface, wherein the monophonic signal is transmitted by the transmit antenna; and

obtaining the complex number pattern of the transmit antenna according to the amplitudes and the phases, obtained by means of measurement specific to the receive antenna, on the I channel and the Q channel in each measurement direction of the three-dimensional radiation spherical surface.

6. The system of claim 5 , wherein the system further comprises:

a fourth signal analyzer, configured to determine an uplink radiation channel matrix of the terminal device; and

a second processing device, configured to obtain the uplink radiation channel matrix from the fourth signal analyzer, and calculate an inverse matrix of the uplink radiation channel matrix to obtain an uplink radiation channel inverse matrix, wherein

the channel emulator is further configured to obtain the uplink radiation channel inverse matrix from the second processing device.

7. The system according to claim 6 , wherein

the terminal device is further configured to: determine a smaller value m between a quantity of transmit antennas of the terminal device and a quantity of uplink ports of the base station simulator, select m transmit antennas from the multiple transmit antennas, and sequentially transmit the monophonic signal according to the specified sequence by using all of the m transmit antennas; and

the fourth signal analyzer is configured to:

when the terminal device transmits the monophonic signal by using each transmit antenna, separately connect to m uplink antennas in the anechoic chamber, and measure a signal received by each of the m uplink antennas;

generate a signal vector specific to each transmit antenna according to the signals measured from the m uplink antennas; and

generate the uplink radiation channel matrix according to the generated signal vector specific to each of the m transmit antennas.

8. The system of claim 5 , wherein the third signal analyzer is further configured to:

after determining the complex number pattern of each of the multiple transmit antennas of the terminal device, determine, according to complex number patterns of any two of the multiple transmit antennas, an antenna envelope correlation coefficient of the two transmit antennas.