Patent Description:
With the development of wireless mobile communication, people has higher and higher requirements on wireless communication rate. Compared with the traditional Single Input Single Output (SISO) system (such as the second generation and third generation mobile communication), Multiple Input Multiple Output (MIMO, multiple transmitting antennas and multiple receiving antennas) system with a plurality of antennas configured on the receiver/transmitter ports may achieve a higher communication rate and a larger system capacity under the same bandwidth with the help of antenna diversity, spatial multiplexing, and transmission diversity. Theoretically, a data transmission rate of an N×N MIMO system may be N times that of the SISO system. Based on this, MIMO technology is widely applied for the fourth generation (<NUM>) mobile communication system and the fifth generation (<NUM>) mobile communication system. However, the actual data transmission rate of the MIMO communication system depends on many practical factors. In addition to the space propagation environment, the wireless performance of a MIMO terminal has a very important impact on the transmission rate.

The wireless performance of the MIMO terminal depends on several factors, such as sensitivity of the receiver of the terminal, noise, transmitter power, antenna correlation, matching degree between the antenna, receiver and transmitter, baseband processing, and wireless propagation environment. An Over the Air (OTA) test solution for the MIMO terminal provides a method and a test system for evaluating and testing the wireless performance of the MIMO terminal in a controlled environment. The OTA test of the MIMO terminal is not only the basis for mobile operators to check the performance of mobile terminals and to issue terminal network access licenses, but also the technical means of terminal manufacturers in the process of research and development and quality control. OTA testing is also currently recognized as a test method that can evaluate the true wireless performance of MIMO wireless terminals by the 3rd Generation Partnership Project (3GPP) and the China Communications Standards Association (CCSA).

In detail, for the reception performance of a MIMO wireless terminal (that is, downlink MIMO performance), 3GPP provides two standard OTA test solutions, i.e., Multiple Probe Anechoic Chamber (MPAC) method and Radiated Two Stage (RTS) method. The most critical index for evaluating the performance of downlink MIMO is the throughput rate. MIMO uses diversity technology to increase the communication rate. The electromagnetic wave space propagation environment (that is, the channel model) is an important factor that determines its throughput rate. <FIG> illustrates a multipath environment in which a wireless MIMO terminal is located, which includes a direct path from the base station to the terminal, a transmission path of each building, and the Doppler effect. The MIMO OTA test needs to simulate a specified channel model, and then the throughput rate is tested under the model. As illustrated in <FIG>, the MPAC method adopts a plurality of antennas (such as <NUM> antennas) around a DUT (device under test) together with a channel emulator to simulate the MIMO channel, which is an intuitive method. However, the system cost is very high and the system calibration is complicated. The first step of the RTS method is acquiring a receiving antenna pattern of the DUT. The second step is generating a throughput rate test signal based on the acquired receiving antenna pattern in combination with the channel model, and then the throughput test signal is fed to a corresponding receiver by radiation to perform a throughput test. The RTS method uses simple and efficient hardware, with small system errors and high system stability, as illustrated in <FIG>. Due to its advantages in various aspects, RTS has gradually become the most mainstream MIMO test method.

Wireless terminal testing is not only concerned with reception performance, but also transmission performance. Currently, downlink MIMO testing is standardized and industrialized. However, uplink MIMO performance tests for MIMO wireless terminals are still being explored. The current RTS method has the following steps.

Therefore, the current RTS method is only suitable for downlink MIMO testing. The way to test a signal flow is from the base station to the channel model and then to the receiver.

There are only few test methods and test systems capable of accurately testing the uplink performance (transmission performance) of wireless terminals in the related art.

Document <CIT> discloses a signal transmitting method for a terminal apparatus and a terminal apparatus. The terminal apparatus generates a single-tone signal at a preset frequency, and emits the single-tone signal by means of a preset receiving antenna or emitting antenna of the terminal apparatus. The terminal apparatus emits a single-tone signal at a preset frequency by means of any preset antenna, and therefore, an antenna complex radiation pattern measurement system of the terminal apparatus uses each receiving antenna and emitting antenna to emit a single-tone signal at a preset frequency.

The present disclosure aims to solve at least one of the above-mentioned technical problems or to provide at least one useful business option to some extent.

In order to achieve the above objective, a first aspect of embodiments of the present disclosure provides a method for testing wireless performance of a wireless terminal as defined in claim <NUM>.

In some embodiments of the present disclosure, the antenna pattern of the transmitting antennas includes antenna gain information and phase difference information.

In some embodiments of the present disclosure, obtaining the antenna pattern of the transmitting antennas includes: testing the transmitting antennas of the DUT and obtaining the antenna pattern.

In some embodiments of the present disclosure, obtaining the antenna pattern of the transmitting antennas includes:
testing a receiving antenna of the DUT to obtain the antenna pattern, in which the antenna pattern of the transmitting antenna is identical to the antenna pattern of the receiving antenna for a system that transmit and receive signals at the same frequency.

In some embodiments of the present disclosure, a signal from the transmitting antennas of the DUT is able to be received by any selected testing antennas.

In some embodiments of the present disclosure, when the DUT is a <NUM>×<NUM> MIMO wireless terminal, the propagation channel matrix is: <MAT> axy represents an amplitude change from a y-th transmitting antenna of the DUT to an x-th testing antenna, ϕxy represents a phase change from the y-th transmitting antenna of the DUT to the x-th testing antenna, A represents the propagation channel matrix.

In some embodiments of the present disclosure, the original transmitting signals, the loaded signals, the signals received by the selected testing antennas, the propagation channel matrix and the inverse matrix of the propagation channel matrix meet a following relation: <MAT> <MAT> and <MAT> where, (x<NUM>,x<NUM>) represents the original transmitting signals, (Tx<NUM>,Tx<NUM>) represents the loaded signals, (s<NUM>,s<NUM>) represents the signals by the selected testing antennas, A represents the propagation channel matrix, and I represents an identity matrix.

In some embodiments of the present disclosure, processing, by the channel emulator, the signal to generate the analog signal and sending the analog signal to the analog base station includes:.

With the method for testing wireless performance of the wireless terminal according to the present disclosure, the propagation channel matrix is generated by putting the DUT in the anechoic chamber, so the purpose of eliminating the propagation channel matrix can be achieved by loading the inverse matrix of the propagation channel matrix.

Embodiments of a second aspect of the present disclosure provide a system for testing wireless performance of a wireless terminal as defined in claim <NUM>.

Moreover, in some embodiments of the present disclosure, the channel emulator and the analog base station are integrated into one test instrument, or constitute a plurality of test instruments respectively.

In some embodiments of the present disclosure, the channel emulator is configured to receive a signal from the testing antennas, process the signal to obtain an analog signal by calculating the received signal based on an antenna pattern of the transmitting antennas of the DUT and a preset channel model.

The present disclosure provides a new method and system for testing uplink wireless performance of the wireless terminal, which can ensure accuracy and convenience of the test, and are simple to implement and low in cost.

The present disclosure has the following advantages.

Additional aspects and advantages of the present disclosure will be given in part in the following description, part of which will become apparent from the following description, or be learned through practice of the present disclosure.

The above and/or additional aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings.

The following describes a method for testing wireless performance of a wireless terminal according to the first aspect of an embodiment of the present disclosure with reference to the drawings. A device under test (DUT) <NUM> (i.e., the wireless terminal) has a plurality of transmitting antennas <NUM> and the DUT <NUM> is placed in an anechoic chamber <NUM>. Similarly, the number of testing antennas <NUM> placed in the anechoic chamber <NUM> is equal to the number of the transmitting antennas <NUM> of the DUT <NUM>.

As illustrated in <FIG>, the method for testing wireless performance of a wireless terminal includes the following steps.

The method for testing wireless performance of the wireless terminal according to the embodiment of the first aspect will be described in detail below with reference to the accompanying drawings.

At block <NUM>, the antenna pattern of the plurality of transmitting antennas <NUM> of the DUT <NUM> is obtained and imported into a channel emulator <NUM>. The antenna pattern is one of the important performance indicators of the antenna, and the antenna pattern includes information such as the pattern, antenna gain, and phase difference. A method for obtaining the antenna pattern of two transmitting antennas <NUM> of the DUT <NUM> is described below by taking a <NUM>×<NUM> MIMO wireless terminal as an example of the DUT <NUM>.

In detail, as illustrated in <FIG>, the antenna pattern can be obtained by testing the transmitting antennas <NUM> of the DUT <NUM> through adjusting a relative position between the DUT <NUM> and the testing antennas <NUM> placed in the anechoic chamber <NUM>. The antenna pattern is obtained by testing the transmitting antennas <NUM> of the DUT <NUM>. The DUT <NUM> has two transmitting antennas <NUM> (i.e., a transmitting antenna <NUM> and a transmitting antenna <NUM>), and two transmitters <NUM> (i.e., a transmitter <NUM> and a transmitter <NUM>). Meanwhile, a same number of testing antennas <NUM> as the number of the transmitting antennas <NUM> is selected, i.e., a testing antenna <NUM> and a testing antenna <NUM>.

Firstly, the transmitters <NUM> and the transmitting antenna <NUM> of the DUT <NUM>, and the testing antennas <NUM> are turned on. Gain of each transmitting antenna <NUM> of the DUT <NUM> is obtained. That is, gain of the transmitting antenna <NUM> and the transmitting antenna <NUM> is obtained. In detail, each time the DUT <NUM> turns on one transmitter <NUM> separately, antenna gain of a transmitting antenna <NUM> corresponding to the turned-on transmitter <NUM> can be calculated by the following formula (<NUM>). That is, by turning on the transmitter <NUM>, the antenna gain of the transmitting antenna <NUM> can be tested and calculated, and by turning on the transmitter <NUM>, the antenna gain of the transmitting antenna <NUM> can be tested and calculated.

In the above formula (<NUM>), a transmitting power of the transmitter <NUM> is Po, a total path loss (including the gain of the testing antenna <NUM> and link loss) of the anechoic chamber <NUM> is PL , receiving power of the testing instrument (such as a testing instrument integrated the channel emulator <NUM> and the analog base station <NUM>) is Pr, the antenna gain G of the transmitting antennas <NUM> and <NUM> can be calculated respectively. The parameters in formula <NUM> are in a dB format.

Secondly, the transmitting antennas <NUM> and the transmitters <NUM> of the DUT <NUM>, and the testing antennas <NUM> are turned on. The DUT <NUM> and the testing antennas <NUM> in the anechoic chamber <NUM> are rotated, and a phase difference of the transmitting signals of the transmitting antennas <NUM> at each angle before and after the rotation can be obtained. For example, at a certain angle, by turning on the transmitter <NUM> and the testing instrument (such as a testing instrument integrated the channel emulator <NUM> and the analog base station <NUM>), an amplitude P<NUM> corresponding to the receiving power of the testing instrument is obtained, by turning on the transmitter <NUM> and the testing instrument, an amplitude P<NUM> corresponding to the receiving power of the testing instrument is obtained, and by simultaneously turning on the transmitter <NUM>, the transmitter <NUM> and the testing instrument, an amplitude Pa corresponding to the receiving power of the testing instrument is obtained. Then, at this angle, a relationship among the phase difference θ between the transmitting antenna <NUM> and the transmitting antenna <NUM>, P<NUM>, P<NUM> and Pa are illustrated as formula (<NUM>), in which the DUT <NUM> and the testing antennas <NUM> can be rotated repeatedly according to the testing requirements.

The antenna gain information of the transmitting antenna <NUM> and the transmitting antenna <NUM> of the DUT <NUM> is obtained through the above method, and the phase difference information between the transmitting antenna <NUM> and the transmitting antenna <NUM> before the rotation and the phase difference information between the transmitting antenna <NUM> and the transmitting antenna <NUM> after the rotation can be obtained. The antenna pattern of the transmitting antenna <NUM> is obtained according to the above information, and imported into the channel emulator <NUM>.

Meanwhile, as illustrated in <FIG>, for a system that transmit and receive signals at the same frequency, the antenna pattern of the transmitting antenna <NUM> of the DUT <NUM> and the antenna pattern of the receiving antenna <NUM> of the DUT <NUM> are the same. Therefore, the antenna pattern can also be obtained by testing the receiving antenna <NUM> of the DUT <NUM>. That is, the pattern information of the receiving antenna <NUM> of the DUT <NUM> is the same as the pattern information of the transmitting antenna <NUM> of the DUT <NUM>. The DUT <NUM> has two receiving antennas <NUM> (i.e., a receiving antenna <NUM> and a receiving antenna <NUM>), and two receivers <NUM> (i.e., a receiver <NUM> and a receiver <NUM>). Meanwhile, the same number of testing antennas <NUM>, i.e., a testing antenna <NUM> and a testing antenna <NUM>, as the number of the transmitting antennas <NUM> is selected.

Firstly, the receiver <NUM> and the receiving antennas <NUM> of the DUT <NUM>, and the testing antenna <NUM> are turned on, and gain of each receiving antenna <NUM> of the DUT <NUM> is obtained, that is, the gain of the receiving antenna <NUM> and the receiving antenna <NUM> is obtained. In detail, it is only necessary to open one testing antenna <NUM> separately, for example, opening the testing antenna <NUM>, to read reports of the receiver <NUM> and the receiver <NUM>, and gains of the receiving antenna <NUM> and the receiving antenna <NUM> are calculated respectively based on formula (<NUM>). <MAT> where, PRss is a reporting power of the receiver <NUM>, Pu is a transmitting power of the testing instrument (such as a testing instrument integrated the channel emulator <NUM> and the analog base station <NUM>), the total path loss (including the gain of the testing antenna <NUM> and the link loss) of the anechoic chamber <NUM> is PL, then the antenna gain G of the receiving antenna <NUM> and the receiving antenna <NUM> can be calculated respectively. The obtained gain of the receiving antenna <NUM> is equal to the gain of the transmitting antenna <NUM>, and the obtained gain of the receiving antenna <NUM> is equal to the gain of the transmitting antenna <NUM>. The parameters in formula (<NUM>) is in a dB format.

Secondly, the receiver <NUM> and the receiving antenna <NUM> of the DUT <NUM>, and the testing antenna <NUM> are turned on. The DUT <NUM> and the testing antenna <NUM> placed in the anechoic chamber <NUM> are rotated, and a phase difference of the receiving signals of the receiving antennas <NUM> at each angle before and after the rotation is obtained. The phase difference information between the receiving antenna <NUM> and the receiving antenna <NUM> can be directly obtained by reading the reports from the receiver <NUM> and the receiver <NUM>. The obtained phase difference information between the receiving antenna <NUM> and the receiving antenna <NUM> is equal to the phase difference information between the transmitting antenna <NUM> and the transmitting antenna <NUM>. The DUT <NUM> and the testing antennas <NUM> can be rotated repeatedly according to the testing requirements.

With the above method, the antenna gain information of the transmitting antenna <NUM> and the transmitting antenna <NUM> of the DUT <NUM> is obtained, and the phase difference information between the transmitting antenna <NUM> and the transmitting antenna <NUM> before the rotation and the phase difference information between the transmitting antenna <NUM> and the transmitting antenna <NUM> after rotation are obtained, the antenna pattern of the transmitting antenna <NUM> is obtained according to the above information, and the obtained antenna pattern is imported into the channel emulator <NUM>.

At block <NUM>, a same number of testing antennas <NUM> in the anechoic chamber <NUM> as a number of the transmitting antennas <NUM> of the DUT <NUM> is selected, so that the transmitting antennas <NUM> of the DUT <NUM> transmit signals to the selected testing antennas <NUM> to generate a propagation channel matrix from output ports of the transmitting antennas <NUM> of the DUT <NUM> to input ports <NUM> of the selected testing antennas.

In detail, as illustrated in <FIG>, a <NUM>×<NUM> MIMO wireless terminal is taken as an example of the DUT <NUM>. The DUT <NUM> has two transmitting antennas <NUM> and <NUM>. Meanwhile, the same number of testing antennas <NUM> as the number of the transmitting antennas <NUM> are selected, i.e., a testing antenna <NUM> and a testing antenna <NUM> are selected. When the transmitting antenna <NUM> transmits a signal to the selected testing antenna <NUM>, the signal sent by the transmitting antenna <NUM> can be received by any selected testing antenna <NUM>. That is, a signal sent by the transmitting antenna output port <NUM> can be received by a testing antenna input port <NUM> and a testing antenna input port <NUM>, and a signal sent by the transmitting antenna output port <NUM> can be received by the testing antenna input port <NUM> and the testing antenna input port <NUM>. Therefore, during the signal propagation process, a propagation channel matrix for signal propagation is generated, as illustrated by the dashed part in <FIG>.

The present disclosure summarizes the law of signal propagation, and expresses the propagation channel matrix of signal propagation with the following formula (<NUM>): <MAT>.

axy represents an amplitude change from a y-th output port of the transmitting antennas <NUM> of the DUT to an x-th input port <NUM> of the testing antennas, ϕxy represents a phase change from the y-th output port of the transmitting antennas <NUM> of the DUT to the x-th input port <NUM> of the testing antennas, A represents the propagation channel matrix.

Further, at block <NUM>, an input port <NUM> of the selected testing antennas receives a transmitting antenna output port signal from the output port <NUM> of the transmitting antennas of the DUT <NUM> to generate a testing antenna input port signal and transmits the testing antenna input port signal to the channel emulator <NUM>, such that the channel emulator <NUM> receives the testing antenna input port signal and processes the testing antenna input port signal to obtain an analog signal and send the analog signal to an analog base station <NUM>.

The following examples shown in <FIG> and <FIG> is not according to the invention and are present for illustration purposes only. In detail, as illustrated in <FIG>, a <NUM> × <NUM> MIMO wireless terminal is taken as an example of the DUT <NUM>. The DUT <NUM> has two transmitting antennas <NUM> (the transmitting antenna <NUM> and the transmitting antenna <NUM>), the transmitting antenna <NUM> has a transmitting antenna output port <NUM>, and the transmitting antenna <NUM> has a transmitting antenna output port <NUM>. Meanwhile, the same number of testing antennas <NUM> as the number of the transmitting antenna <NUM> are selected, that is, the testing antenna <NUM> and the testing antenna <NUM> are selected. The testing antenna <NUM> has a testing antenna input port <NUM> and the testing antenna <NUM> has a test antenna input port <NUM>.

As illustrated in <FIG>, the testing antenna input port <NUM> receives the transmitting antenna output port signals x<NUM> and x<NUM> transmitted from the transmitting antenna output port <NUM> and the transmitting antenna output port <NUM> of the DUT <NUM>, and generates the testing antenna input port signal Bx<NUM>. At the same time, the testing antenna input port <NUM> receives the transmitting antenna output port signals x<NUM> and x<NUM> from the transmitting antenna output port <NUM> and the transmitting antenna output port <NUM> of the DUT <NUM>, and generates the testing antenna input port signal Bx<NUM>. The above signals are generated because the propagation channel matrix A is generated during the propagation process. Under the influence of the propagation channel matrix A, the transmitting antenna output port signals (x<NUM>,x<NUM>) and the testing antenna input port signals (Bx<NUM>,Bx<NUM>) satisfy the following relation of formula (<NUM>).

As illustrated in <FIG>, in a case where the above formula (<NUM>) is satisfied, the testing antenna input port <NUM> send the testing antenna input port signals (Bx<NUM>,Bx<NUM>) to the channel emulator <NUM>. The channel emulator <NUM> performs subsequent process on the received testing antenna input port signals (Bx<NUM>,Bx<NUM>), the processing steps includes the followings.

C101: at block <NUM>, the channel emulator <NUM> loads an inverse matrix B of a propagation channel matrix on the received testing antenna input port signals (Bx<NUM>,Bx<NUM>) to obtain signals to be calculated (s<NUM>,s<NUM>), formula (<NUM>) is provided as follows.

The propagation channel matrix is unavoidable. The purpose of eliminating the propagation channel matrix can be achieved by loading an inverse matrix B of the propagation channel matrix.

C102: at block <NUM>, the channel emulator <NUM> loads a channel model formula operation on the signals to be calculated (s<NUM>,s<NUM>) based on the antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and a preset standard to obtain the analog signals (y<NUM>,y<NUM>).

In detail, when performing the formula operation for loading the channel model, the antenna pattern of the transmitting antenna <NUM> of the DUT <NUM> required for the operation is obtained at block <NUM> and imported into the channel emulator <NUM>. The preset standard includes the channel model and receiving pattern information of the base station, which are standard data known in the related art. The channel emulator <NUM> combines the imported antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and the preset standard to load the channel model formula operation on the signals to be calculated (s<NUM>,s<NUM>). The related channel model operation formula includes formulas (<NUM>) to (<NUM>), formulas (<NUM>) to (<NUM>) belong to the existing standard calculation formulas: <MAT>.

The above formula indicates the signals (x<NUM>,x<NUM>,. xs) from the S transmitting antenna output ports <NUM> of the S×U MIMO wireless terminal(i.e., the DUT <NUM>) to the signals (y<NUM>,y<NUM>,. yU) of the U ports of the analog base station <NUM>.

H(t) is a U×S channel model, an element hu,s(t) in row u and column s may be represented as: <MAT> where, hn,u,s(t) is the nth element of the hu,s(t), which represents a propagation path of the channel model. <MAT> <MAT> and <MAT> are gain information of the s-th transmitting antenna <NUM> of the DUT <NUM>, <MAT> are the channel model complex gain, <MAT> and <MAT> are the u-th receiving antenna gain of the analog base station <NUM>, <MAT> and <MAT> are a starting angle of the transmitting signal of the transmitting antenna <NUM> and a receiving angle of the receiving signal of the testing antenna <NUM>, <MAT> and <MAT> are phase shift of the signal transmitted from the transmitting antenna <NUM> and phase shift of the signal received by the testing antenna <NUM>, A is a wavelength, and kv represents Doppler effect.

The channel emulator <NUM> loads the above channel model formula operation on the signals to be calculated (s<NUM>,s<NUM>) based on the imported antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and the preset standard to obtain the analog signals (y<NUM>,y<NUM>). The related formula is: <MAT> let <MAT>.

I is an identity matrix , H(t) is a channel model, by combining formulas (<NUM>) (<NUM>) (<NUM>) and (<NUM>) <MAT>.

C103: at block <NUM>, the analog signals (y<NUM>,y<NUM>) is transmitted to the analog base station <NUM>.

In some embodiments, as illustrated in <FIG>, a <NUM> × <NUM> MIMO wireless terminal is taken as an example of the DUT <NUM>. The DUT <NUM> has two transmitting antennas <NUM> (the transmitting antenna <NUM> and the transmitting antenna <NUM>), the transmitting antenna <NUM> has a transmitting antenna output port <NUM>, and the transmitting antenna <NUM> has a transmitting antenna output port <NUM>. Meanwhile, the same number of testing antennas <NUM> as the number of the transmitting antennas <NUM> are selected, that is, the testing antenna <NUM> and the testing antenna <NUM> are selected. The testing antenna <NUM> has a testing antenna input port <NUM> and the testing antenna <NUM> has a test antenna input port <NUM>.

The method for testing wireless performance of a wireless terminal further includes the following steps. As illustrated in <FIG>, original transmitting antenna output port signals to be tested are (x<NUM>,x<NUM>), but the DUT <NUM> first loads the transmitting antenna output port signals with an inverse matrix C of the propagation channel matrix before the signals are generated, and then actual transmitting antenna output port signals are (Tx<NUM>,Tx<NUM>). After the transmitting antenna <NUM> sends the actual transmitting antenna output port signals (Tx<NUM>,Tx<NUM>) to the testing antenna <NUM>, the testing antenna input port <NUM> receives the transmitting antenna output port signals Tx<NUM> and Tx<NUM> transmitted by the transmitting antenna output port <NUM> and the transmitting antenna output port <NUM>, and a testing antenna input port signal Si is generated under effect of the propagation channel matrix A. Meanwhile, the testing antenna input port <NUM> receives the transmitting antenna output port signals Tx<NUM> and Tx<NUM> transmitted by the transmitting antenna output port <NUM> and the transmitting antenna output port <NUM>, and a testing antenna input port signal S<NUM> is generated under the effect of the propagation channel matrix A. At this time, the original transmitting antenna output port signals to be tested (x<NUM>,x<NUM>), the actual transmitting antenna output port signals (Tx<NUM>,Tx<NUM>) and the testing antenna input port signals (Bx<NUM>,Bx<NUM>) satisfy the following relation illustrated as formula (<NUM>) <MAT> <MAT> and <MAT>.

The propagation channel matrix is unavoidable, so the purpose of eliminating the propagation channel matrix can be achieved by loading the inverse matrix of the propagation channel matrix to the transmitted signals before the signals are transmitted.

It should be noted that the inverse matrix C of the propagation channel matrix and the aforementioned inverse matrix B of the propagation channel matrix may be the same inverse matrix of the propagation channel matrix, or may be different inverse matrixes of the propagation channel matrix, such as a left inverse matrix and a right inverse matrix of the propagation channel matrix, respectively.

As illustrated in <FIG>, when the above formulas (<NUM>) to (<NUM>) are satisfied, the testing antenna input port <NUM> sends the testing antenna input port signals (s<NUM>,s<NUM>) to the channel emulator <NUM>. The channel emulator <NUM> receives the testing antenna input port signals (s<NUM>,s<NUM>) and performs subsequent processing on the signal. The subsequent processing includes the followings.

C201: at block <NUM>, the channel emulator <NUM> loads a channel model formula operation on the signals to be calculated (s<NUM>,s<NUM>) based on the imported antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and a preset standard to obtain the analog signals (y<NUM>,y<NUM>).

In detail, during loading the channel model formula operation, the antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> required for the operation is obtained at block <NUM> and imported into the channel emulator <NUM>. The preset standards include a channel model and base station receiving pattern information, which are standard data known in the related art. The channel emulator <NUM> combines the imported antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and the preset standard to load the channel model formula operation on the signals to be calculated (s<NUM>,s<NUM>). The related channel model operation formula includes formulas (<NUM>)-(<NUM>). The related formulas are not repeated here. Finally, the analog signals (y<NUM>,y<NUM>) can be obtained, and a relevant formula is: <MAT>.

By combining formulas (<NUM>)- (<NUM>), <MAT>.

C202: at block <NUM>, the analog signal (y<NUM>,y<NUM>) is transmitted to the analog base station <NUM>.

Comparing <FIG> and <FIG> with <FIG> and <FIG>, the two methods can be summarized as follows. The former is that the testing antenna input port <NUM> receives the transmitting antenna output port signals (x<NUM>,x<NUM>) and generates the testing antenna input port signals (Bx<NUM>,Bx<NUM>), the channel emulator <NUM> loads the inverse matrix of the propagation channel matrix on the testing antenna input port signals (Bx<NUM>,Bx<NUM>) to obtain the signals to be calculated (s<NUM>,s<NUM>) and loads the channel model formula operation on the signal to obtain the analog signals (y<NUM>,y<NUM>). The latter is that the DUT <NUM> loads the inverse matrix of the propagation channel matrix on the transmitting antenna output port signals (x<NUM>,x<NUM>) that needs to be tested to obtain the actual transmitting antenna output port signals (Tx<NUM>,Tx<NUM>), the testing antenna input port <NUM> receives the actual transmitting antenna output port signals (Tx<NUM>,Tx<NUM>) and generates the testing antenna input port signals (s<NUM>,s<NUM>), the channel emulator <NUM> loads the channel module formula operation on the testing antenna input port signals (s<NUM>,s<NUM>) to obtain the analog signals (y<NUM>,y<NUM>). For the two methods, the step of loading the inverse matrix of the propagation channel matrix is after the DUT transmits the signal in one method, and is before the DUT transmits the signal in another method, but the analog signals (y<NUM>,y<NUM>) obtained by the two are identical.

Further, as shown in <FIG> and <FIG>, at block <NUM>, the analog base station <NUM> receives the analog signals (y<NUM>,y<NUM>) and performs a throughput test to implement an uplink wireless performance test on the DUT <NUM>.

With the method for testing wireless performance of the wireless terminal according to an embodiment of the present disclosure, the analog signals (y<NUM>,y<NUM>) received by the analog base station <NUM> fully complies with MIMO OTA test requirements of the channel model. This method achieves uplink wireless performance testing of the MIMO wireless device. This method is advanced and can implement uplink MIMO throughput test in a common SISO anechoic chamber.

A system for testing wireless performance of a wireless terminal according to an embodiment of the second aspect of the present disclosure is described below with reference to the drawings.

As illustrated in <FIG>, the system for testing wireless performance of a wireless terminal includes an anechoic chamber <NUM>, testing antennas <NUM>, a channel emulator <NUM>, and an analog base station <NUM>.

The anechoic chamber <NUM> is configured to place the testing antennas and a device under test.

The testing antennas <NUM> has a testing antenna input port <NUM>, and are configured to receive a transmitting antenna output port signal transmitted by a transmitting antenna output port <NUM> of a transmitting antenna <NUM> of the device under test <NUM> via the testing antenna input port <NUM>.

The channel emulator <NUM> is configured to receive a testing antenna input port signal transmitted by a testing antenna input port <NUM> of a selected testing antenna <NUM>, process the signal based on antenna pattern of the transmitting antenna <NUM> of the device under test <NUM> and a preset standard to obtain an analog signal, and send the analog signal to the analog base station <NUM>.

The analog base station <NUM> is configured to receive the analog signal, perform a throughput test, to implement an uplink wireless performance test of the device under test <NUM>.

It is noted that the channel emulator <NUM> and the analog base station <NUM> may be integrated in one testing instrument, or may constitute a plurality of testing instruments respectively. As illustrated in <FIG>, the channel emulator <NUM> and the analog base station <NUM> respectively constitute a plurality of testing instruments. As illustrated in <FIG>, the channel emulator <NUM> and the analog base station <NUM> are integrated in one test instrument.

The DUT <NUM> is configured to load an inverse matrix of a propagation channel matrix on an original transmitting signal to get a loaded signal, and transmit the loaded signal by the transmitting antenna <NUM> of the DUT <NUM>. In some embodiments, the channel emulator <NUM> is configured to receive a signal from the testing antennas <NUM>, process the signal to obtain an analog signal by calculating the received signal based on an antenna pattern of the transmitting antennas <NUM> of the DUT <NUM> and a preset channel model.

Claim 1:
A method for testing wireless performance of a wireless terminal, wherein the wireless terminal is configured as a device under test, DUT, the DUT has a plurality of transmitting antennas and is placed in an anechoic chamber, and the method comprises:
obtaining (<NUM>) antenna pattern of the plurality of the transmitting antennas of the DUT, and importing the antenna pattern into a channel emulator;
selecting (<NUM>) a same number of testing antennas in the anechoic chamber as a number of the transmitting antennas of the DUT, so that the transmitting antennas of the DUT transmit signals to the selected testing antennas, and generating a propagation channel matrix between output ports of the transmitting antennas of the DUT and input ports of the selected testing antennas;
loading an inverse matrix of the propagation channel matrix on original transmitting signals to get loaded signals;
transmitting, by the transmitting antennas of the DUT, the loaded signals to the selected testing antennas;
receiving (<NUM>), by the selected testing antennas, transmitting antenna output port signals from the transmitting antennas of the DUT to generate testing antenna input port signals, and sending the testing antenna input port signals to the channel emulator, the channel emulator receiving and processing the testing antenna input port signals to generate an analog signal and sending the analog signal to an analog base station; and
receiving (<NUM>), by the analog base station, the analog signal, and performing a throughput test to obtain an uplink wireless performance test of the DUT.