KR100842683B1 - Method for generating timming synchronize signal on the radio channel measurement system by using multi antennas - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing synchronization signal acquisition apparatus and method thereof in a wireless channel measurement system using multiple antennas. A synchronous clock generator for outputting a final synchronized external clock in phase synchronization, a clock counter for counting a clock generated by the synchronous clock generator according to a preset counter value, and generating a timing synchronization signal, and resetting the clock counter by a reset signal And a reset button to perform a recount operation. Therefore, the present invention is designed so that the timing module of the wireless channel measurement system can be detachably connected to the timing module of the transmission system, and the clock and reset signals of the transmission system are provided to the timing module of the reception system. By generating the timing synchronization signal in the phase-locked state, the wireless channel measurement of the multiple antennas can be stably performed even in the shadowed area having a large amount of propagation scattering.

Wireless channel measurement, transmission system, reception system, multiple antennas, timing module

Description

METHOD FOR GENERATING TIMMING SYNCHRONIZE SIGNAL ON THE RADIO CHANNEL MEASUREMENT SYSTEM BY USING MULTI ANTENNAS}

1 is a block diagram showing a wireless channel measurement system using a common multiple antenna,

2 is a block diagram showing an apparatus for obtaining timing synchronization signals in a wireless channel measurement system using multiple antennas according to the present invention;

3 is a diagram illustrating a configuration in which respective timing modules for acquiring timing synchronization signals are connected at a transmitting side and a receiving side of a wireless channel measurement system according to the present invention;

4 is a timing diagram illustrating a timing synchronization signal generated in the transmission and reception timing module of FIG. 3;

5 is a timing diagram illustrating an example of switching timing and an operation signal of a transmission antenna and a reception antenna according to a channel measurement start signal using the timing synchronization signal generated in FIG. 4;

FIG. 6 is a flowchart illustrating a sequence of acquiring a timing synchronization signal in a wireless channel measurement system using multiple antennas according to an embodiment of the present invention and sequentially illustrating a method of operating the timing synchronization signal. FIG.

<Description of the code | symbol about the principal part of drawing>

100: timing module 101: synchronous clock generator

103: clock counter 105: divider

107: LPF 109: counter value feeder

111: PLL 113: battery power supply

115: internal reset button 117: RS-232 control port

200: timing module of the transmission system 210: user input unit

300: timing module of the receiving system 310: notebook

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless channel measurement system. In particular, the present invention relates to a wireless channel measurement system using multiple antennas capable of accurately acquiring a timing synchronization signal as a reference for switching and operating timing of spatially separated transmit / receive antennas. A timing synchronization signal acquisition method.

Currently, the next generation mobile communication system needs a technology for providing a high data rate in order to provide a variety of high-speed multimedia services away from the existing voice and low-speed data services. In order to achieve a high data rate, various techniques such as using a wide frequency band and using multiple antennas have been studied.

It is very important to know the characteristics of the channel accurately when designing a multi-antenna system because the system using the multi-antenna is more sensitive to the characteristics of the channel than the conventional single antenna system. Next-generation wireless communication systems using multiple antennas are mainly used in urban areas, which have a significant effect on radio waves, such as buildings and trees, and are often used for indoor wireless high-speed data transmission.

FIG. 1 is a diagram illustrating a general wireless channel measurement system using multiple antennas. Referring to this, a wireless channel measurement system using multiple antennas, called a radio channel sounder, generally includes a transmission system 10 and a reception system. It consists of 20.

The transmission system 10 side includes a controller 11, a baseband module 12, a timing module 13, a transmission IF / RF module 15, a transmission switch 17, and a multiplex transmission antenna. Field 19 and the like. In addition, the reception system 20 may include multiple reception antennas 21, a reception switch 22, a reception IF / RF module 23, a baseband module 25, a timing module 27, a controller 28, And a notebook 29 or the like.

The transmission / reception signal for measuring the wireless channel uses a measurement data sequence signal which is mutually promised in advance, such as a pseudo noise sequence. The measurement data sequence is generated by the controller 11 of the transmission system 10 and transmitted to the multiplex transmission antenna 19 via the baseband module 13, the transmission IF / RF module 15, and the transmission switch 17. . In this case, the timing module 13 provides a clock source necessary for the operation of the controller 11, the baseband module 13, and the transmission IF / RF module 15, and provides an appropriate timing and operation signal to the transmission switch 17. By controlling the operation of the multiplex transmission antenna 19.

The data sequence signal transmitted through the transmission antenna 19 of the transmission system 10 is transmitted through the multiple reception antenna 21 of the reception system 20 through the radio channel. The signal received through the receiving antenna 21 is stored in the notebook 29 via the receiving switch 22, the receiving IF / RF module 23, the baseband module 25, and the controller 28. At this time, the timing module 27 provides a clock source necessary for the operation of the controller 28, the baseband module 25, and the receiving IF / RF module 23, and supplies the appropriate timing and operation signals to the receiving switch 22. Control the operation of the receiving antenna 21. Receiving system 20 correlates the received signal with a predetermined signal to obtain a channel measurement.

In the wireless channel measurement using the multiple antennas, in order to obtain and analyze accurate channel data, the multiple transmission antennas 21 must be able to receive the signals sequentially transmitted from the multiple transmission antennas 19 of the measurement apparatus.

The wireless channel measuring system transmits / receives a signal at a location where the transmitting system 10 and the receiving system 20 are spatially separated from each other, so that the transmission time of each transmitting antenna and the receiving time of each receiving antenna are exactly synchronized, that is, an antenna. The antennas should be operated with the switching timing and operation signal synchronized. This is because it is necessary to have all the information on each antenna in the data acquired by the transmission / reception system using the multiple antennas. Accordingly, in the wireless channel measurement system, an apparatus and an operation technique for acquiring an accurate timing synchronization signal, which is a reference for switching timing and operation timing of a transmission / reception antenna, are required.

To this end, conventionally, a GPS receiver is included in the transmission system and the timing modules 13 and 27 of the reception system to mutually synchronize the reference oscillation clock of the reception system and the reference oscillation clock of the transmission system, and then receive the received satellite signal from the GPS receiver. The reference clock was corrected using. However, GPS receivers require minimal azimuth angles to observe satellite signals, and in particular, it is difficult to observe GPS satellite signals in urban areas or indoor shaded areas where obstacles such as buildings and trees are concentrated. There is a limit to providing a synchronous clock.

In another example of the related art, separate synchronization with a central processing unit (CPU) or a microcontroller in the timing modules 13 and 27 to generate mutually synchronized antenna switching timing and transmit / receive operation signals between the transmit / receive systems. Built-in signal generator. In this case, there is a problem that the manufacturing cost is increased because the circuit design method is complicated.

An object of the present invention is to obtain an accurate timing synchronization signal as a reference for switching timing and operation timing of a transmit / receive antenna by connecting timing modules of spatially separated transmit / receive systems to each other when measuring wireless channels using multiple antennas. The present invention provides a timing synchronization signal acquisition method in a wireless channel measurement system using multiple antennas.

delete

In order to achieve the above object, the present invention provides a method for generating a timing synchronization signal through a timing module provided in a transmission and reception system for measuring a wireless channel having multiple antennas, the method comprising: separating a timing module of a reception system; And connecting external clock terminals between the timing module of the separate receiving system and the timing module of the transmitting system to each other, connecting external reset signal terminals between the timing module of the transmitting system and the receiving system to each other, each timing Controlling the phase synchronization of the clocks in the module, setting the same counter value counting the clocks generated in each timing module, and clocks generated in the timing modules of the transmitting and receiving systems, respectively, by a reset signal. Synchronization is synchronized with each other by counting And a step for generating a.

delete

In order to achieve the above object, the present invention provides a method for generating a timing synchronization signal through a timing module provided in a transmission and reception system for measuring a wireless channel having multiple antennas, and measuring a wireless channel. Disconnecting the timing module, connecting external clock terminals between the timing module of the separate receiving system and the timing module of the transmitting system, and connecting external reset signal terminals between the timing module of the transmitting system and the receiving system to each other. Controlling the phase synchronization of the clock in each timing module, setting the same counter value counting the clock generated in each timing module, and timing the transmission and reception system by a reset signal. Each clock generated by the module is counted according to the set counter value. Generating a synchronized timing synchronization signal, disconnecting a connection between the timing module of the receiving system and the timing module of the transmitting system, mounting the corresponding timing module in the receiving system, and each of the timing modules of the transmitting and receiving system, respectively. Performing radio channel measurement of multiple antennas.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a block diagram illustrating an apparatus for obtaining timing synchronization signals in a wireless channel measurement system using multiple antennas according to the present invention.

Referring to FIG. 2, the timing module 100, which is a timing synchronization signal acquisition device included in a wireless channel measurement system of a multi-antenna according to an embodiment of the present invention, is configured as follows.

Synchronous clock generator 101, clock counter 103, divider 105, low pass filter (LPF) 107, counter value supply 109, phase locked loop (PLL) 111, battery power supply 113 , An internal reset button 115, an RS-232 control port 117, and the like.

It consists of an external input 1PPS clock 120, an external output 1PPS clock 122, an external reset signal 124, a timing synchronization signal 126, a system reference clock 128, and an IF / RF reference clock 130.

The synchronous clock generator 101 is a commercially available product having a precision of 10 ns or less, and is a clock oscillator for synchronizing the 1 PPS clock generated by the external input 1 PPS clock 120 and generating its own 10 MHz synchronous clock. The synchronous clock generator 101 has an automatic synchronous mode and a manual synchronous mode, and the selection and operation of the mode can be controlled by a personal computer such as a notebook connected through the RS-232 control port 117. If the synchronous clock generator 101 is selected as the automatic mode, it automatically synchronizes its own 1PPS clock based on the external input 1PPS clock 120, and if the synchronous clock generator 101 is selected as the manual mode, the external device is connected through the RS-232 port 117. The phase difference between the input 1PPS clock 120 and its own 1PPS clock is read and the user of the notebook manually adjusts the phase of the 1PPS clock to synchronize.

The self 1PPS clock generated by the synchronous clock generator 101 is output to the external output 1PPS clock 122 and the internal 1PPS clock, and the internal 1PPS clock is supplied to the clock counter 103 in the timing module 100. The 10 MHz synchronous clock synchronized with the 1 PPS clock is supplied to the divider 105 in the timing module 100.

The clock counter 103 generates a timing synchronization signal 126 by counting the internal 1PPS clock provided from the synchronization clock generator 101 according to the set counter value supply 109. The reset operation may also be performed by an external reset signal 124 input from the outside of the timing module 100. At this time, the timing synchronization signal 126 is output in the form of a signal that is completely in phase synchronization with the input 1PPS clock.

The divider 105 distributes the 10 MHz clock of the synchronous clock generator 101 to the PLL 111 and the LPF 107 without attenuation.

The LPF 107 filters the 10 MHz clock supplied from the divider 105 and outputs it to the outside of the timing module as the IF / RF reference clock 130. In this case, the IF / RF reference clock 130 is used as a reference clock that is a reference for the operation of the transmit / receive IF / RF module.

The counter value supply 109 transmits a counter value to the clock counter 103 at the request of a user, wherein the counter value is a value for determining the time interval of the timing synchronization signal 126 to count the number of 1PPS clocks. It becomes the reference value.

The PLL 111 multiplies the 10 MHz supplied from the divider 105 to generate a 400 MHz clock, and outputs the 400 MHz clock to the outside of the timing module 100 as the system reference clock 128. At this time, the system reference clock 128 of the PLL 111 is used as the system clock of the radio channel measurement system.

The battery power supply 113 serves to supply power to the timing module 100. When there is no external power supply, that is, when the timing module 100 moves away from the transmission / reception system, power is supplied to the components inside the timing module 100.

The internal reset button 115 generates an internal reset signal to the clock counter 103 to reset the operation of the clock counter 103, and the internal reset signal is externally reset through the interior of the clock counter 103. It is also conveyed by signal 124.

3 is a diagram illustrating a configuration in which respective timing modules for acquiring timing synchronization signals are connected at a transmitting side and a receiving side of a wireless channel measurement system according to the present invention.

Referring to FIG. 3, the timing modules 200 and 300 respectively provided in the transmission system and the reception system of the wireless channel measurement system according to the present invention have the following connection structure in order to generate the respective timing synchronization signals 203 and 307. Has

The timing module 200 of the transmitting system connects the external output 1PPS clock terminal 205 to the external input 1PPS clock terminal 303 of the timing module 300 of the receiving system with a cable. The timing module 200 of the transmission system connects the external reset signal output terminal 207 to the external reset signal input terminal 305 of the timing module 300 of the reception system with a cable.

The internal reset button 201 in the timing module 200 of the transmission system is for generating a reset signal for generating timing synchronization signals 203 and 307 in the transmission and reception timing modules 200 and 300. The internal reset signal generated by the user input unit 210 is transmitted to the input terminal 305 of the external reset signal of the timing module 300 of the receiving system through the external reset signal output terminal 207, and the timing of the receiving system. The clock counter in the module 300 is reset.

The RS-232 control port 301 of the timing module 300 of the receiving system is connected to a computer such as a notebook 310 to connect the 1PPS clock signal of the timing module 200 of the transmitting system and the timing module 300 of the receiving system. This is to monitor whether the phase synchronization of the 1PPS clock signal is correct.

FIG. 4 is a timing diagram illustrating timing synchronization signals generated by the transmitting and receiving timing module of FIG. 3.

When a signal for turning on the internal reset button 201 of the transmission system timing module 200 of FIG. 3 through the user input unit 210 is input, a reset signal 400 as shown in FIG. 4 is generated. The reset signal 400 serves to reset the value of the clock counter of the timing module 200 of the transmission system to 0, and is output through the external reset signal output terminal 207 so that the timing module 300 of the reception system It is transmitted to an external reset signal input terminal 305. The signal 400 resets the value of the clock counter of the timing module 300 of the receiving system to zero.

The clock counter built in each of the timing module 200 of the transmission system and the timing module 300 of the reception system detects the falling edge of the reset signal 400 and then sets the 1PPS clock 401 according to a preset counter value. Count. At this time, the count start time of the 1PPS clock 401 is generated by the reset signal 400 and counted based on the rising edge of the 1PPS clock 401, and generates the timing synchronization signal 403 according to a preset counter value. . For example, when the counter value of the timing synchronization signal 403 is set to 3, the timing synchronization signal 403 generated once every three seconds by counting three 1PPS clocks 401 generated by the reset signal 400. Will occur).

FIG. 5 is a timing diagram illustrating an example of switching timing and an operation signal of a transmitting antenna and a receiving antenna according to a channel measurement start signal using the timing synchronization signal generated in FIG. 4. Here, an example is a case where there are four transmit and receive antennas of the wireless channel measurement system.

The transmission system and the reception system of the wireless channel measurement system each generate the same channel measurement start signal 500, detect the falling edge of the channel measurement start signal 500, and then raise the timing synchronization signal 501 which is generated later. Four transmit antenna switching timing and operation signals 503 and four receive antenna switching timing and operation signals 505 are respectively generated from an edge point.

Transmit antenna switching timing and operation signals 503 are applied to each of the four transmit antennas so that the first transmit antenna operates (switching) in synchronization with the rising edge of the timing synchronization signal 501, and then the second transmit antenna. The third transmit antenna and the fourth transmit antenna operate in sequence. After the fourth transmit antenna is operated, the first transmit antenna is operated again.

The receive antenna switching timing and operation signal 505 are applied to each of the four receive antennas and operate in accordance with the operation timing of each single transmit antenna. That is, the first receiving antenna operates according to the rising edge at the time of operating the first transmitting antenna, followed by the second receiving antenna, the third receiving antenna, and the fourth receiving antenna. After the fourth receiving antenna is operated, the operating point of the receiving antennas is applied to the rising edge of the operating point of the second transmitting antenna again.

This series of operation signals starts after the channel measurement start signal 500 has occurred, in accordance with the first timing synchronization signal 501, and subsequent rising edges of the timing synchronization signal 501 affect the operation signal of the antenna. Not crazy If the channel measurement start signal 500 is generated again, the series of operation signals 503 and 505 of the transmitting / receiving antenna generated so far disappear, and the series of signals is adjusted in accordance with the next timing synchronizing signal 501 that occurs. The process begins again.

FIG. 6 is a flowchart illustrating a sequence of acquiring a timing synchronization signal in a wireless channel measurement system using multiple antennas according to an embodiment of the present invention and sequentially operating the signal.

2 to 6, the timing synchronization signal acquisition apparatus of the wireless channel measurement system of the multi-antenna according to an embodiment of the present invention operates as follows.

First, as shown in FIG. 3, the reception system of the wireless channel measurement system separates its own timing module 300 and connects it to the timing module 200 of the transmission system. The output 1PPS clock terminal 205 and the external input 1PPS clock terminal 303 of the receiving system timing module 300 are interconnected. The external reset output terminal 207 of the transmission system timing module 200 is connected to the external reset input terminal 305 of the reception system timing module 300 (S102 to S104).

The transmission system timing module 200 generates a 1PPS clock and transmits it to the reception system timing module 300 through an external output 1PPS clock terminal 205 and an external input 1PPS clock terminal 303 connected thereto. Here, the 1PPS clock is a 1PPS clock which is automatically generated by the synchronization clock generator (101 in FIG. 2) of the transmission system timing module 200, and is a clock for the 1PPS clock phase synchronization in the synchronization clock generator of the reception system timing module 300. Used.

Accordingly, the synchronization clock generator of the reception system timing module 300 calculates a phase difference from an internally generated 1PPS clock using an input external 1PPS clock, and phase shifts the internal 1PPS clock by a corresponding phase difference to finally phase synchronize. Generate a 1PPS clock. At this time, the synchronization clock generator of the timing module 200 and 300 of the transmission and reception system may be set to a manual synchronization mode or an automatic synchronization mode, and the setting of the synchronization mode is RS-232 control of the reception system timing module 300. It is controlled through the notebook 310 connected to the port (301 of FIG. 3), and controls and monitors the synchronization of the 1PPS clock through the notebook 310 connected to the reception system timing module 300 as described above (S106). In each of the timing modules 200 and 300, the system reference clock and the IF / RF reference clock are also generated as clocks synchronized with the 1PPS clock.

As a result of monitoring, the notebook 310 determines whether the phase synchronization of the 1PPS clock is matched (S108).

As a result of the determination of S108, when the phase synchronization of the 1PPS clock is not performed between the two timing modules 200 and 300, the step S106 is repeated to perform the monitoring while performing the 1PPS clock synchronization control process.

If it is determined in S108 that the phase synchronization of the 1PPS clock is performed, the timing modules 200 and 300 of the transmitting and receiving system set the same counter values (S110).

A signal for turning on the internal reset button is input to the timing module 200 of the transmission system through the user input unit 210. Accordingly, the clock counter of the transmission system timing module 200 generates a timing synchronization signal as shown in FIG. 4 according to a preset counter value. In addition, an internal reset signal is generated in the transmission system timing module 200, which is transmitted to the clock counter of the reception system timing module 300 through an external reset signal output terminal 207 and an external reset signal input terminal 305 connected thereto. Is entered. Accordingly, the clock counter of the reception system timing module 300 generates the timing synchronization signal as shown in FIG. 4 according to the counter value set in the same manner as the transmission system. (S112) As described above, the reception system timing module ( The timing synchronization signal generated at 300 becomes a synchronized signal having the same phase as the timing synchronization signal of the transmission system.

After the timing synchronization signal is generated in the timing module of the transmission and reception system, the timing module 300 of the reception system is separated from the timing module 200 of the transmission system. (S114) In this case, the timing modules 200, Since the timing synchronization signal and the reference clocks generated in the above process must be maintained even after the 300 is removed, the power supply of the reception system timing module 300 should be switched to use the battery power source.

The separated receiving system timing module 300 is remounted to the receiving system of the wireless channel measuring system (S116).

Next, the radio channel measurement system sets radio channel measurement parameters of the transmission system and the reception system in order to measure radio channels of the multiple antennas (S118). Here, the radio channel measurement parameters are types of Pseudo Noise (PN) sequences. As an important parameter for determining the shape of a transmission signal used for channel measurement such as length, repetition period, etc., it also has an important influence on the transmission / reception antenna switching timing and the operation signal period.

After setting the parameter of the signal to be measured, as shown in FIG. 5, the transmission system and the reception system generate the channel measurement start signals, respectively (S120). At this time, the transmission system and the reception system of the wireless channel measurement system have respective timings. The module generates a transmission antenna switching timing and an operation signal and a reception antenna switching timing and an operation signal based on the timing synchronization signal generated according to the channel measurement start signal. In addition, wireless channel measurement of multiple antennas is performed according to the switching timing and operation signals.

After performing radio channel measurement of multiple antennas of the transmission system and the reception system, it is determined whether the radio channel measurement is terminated (S124).

As a result of the determination of S124, when the measurement of the radio channel is terminated, the measurement of the multi-antenna radio channel of the transmission and reception system is terminated. Generate channel measurement start signal again to perform channel measurement.

As described above, the present invention synchronizes the clock of the reception system with the clock of the transmission system by connecting the clock terminal and the reset signal terminal of the timing module included in the transmission and reception system of the wireless channel measurement system to each other. The reset signal generates a timing synchronization signal according to the clocks synchronized with each of the timing modules of the transmission and reception system, disconnects the two timing modules, and then uses the channel measurement signal in each transmission and reception system to Perform radio channel measurements.

In addition, the present invention can control whether the clock is synchronized through a computer connected to the receiving system can be monitored.

In addition, according to the present invention, when the timing module of the receiving system is moved, power can be stably supplied to the internal configuration of the timing module through the battery power supply unit.

Accordingly, the present invention is designed so that the timing module of the wireless channel measurement system can be detachably connected to the timing module of the transmission system, and the clock and reset signals of the transmission system are provided to the timing module of the reception system. Since the timing synchronization signal is generated in the phase-locked state, the wireless channel measurement of the multi-antenna can be stably performed even in a shaded area where propagation is high.

In addition, the present invention does not need to perform the timing synchronization process again by connecting the timing modules of the transmission system and the reception system when the radio channel measurement parameter is modified and changed after the radio channel measurement of the multi-antenna is performed. There is a convenient way to make continuous channel measurements.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

Claims (10)

delete delete delete delete A method for generating a timing synchronization signal through a timing module provided in a transmission and reception system for measuring a wireless channel having multiple antennas, respectively. Separating the timing module of the receiving system; Coupling an external clock terminal between the timing module of the separated receiving system and the timing module of the transmitting system; Connecting external reset signal terminals between the timing module of the transmitting system and the receiving system with each other; Controlling phase synchronization of a clock in each timing module; Setting the same counter value for counting clocks generated by each timing module; Generating a timing synchronization signal synchronized with each other by counting clocks generated in the timing module of the transmission and reception system according to the set counter value by the reset signal; Method of obtaining a timing synchronization signal in a wireless channel measurement system using a multiple antenna comprising a. The method of claim 5, In the controlling of the phase synchronization of the clock, an external computer connected to the timing module of the receiving system controls the synchronization of the clock and monitors the timing in the wireless channel measurement system using multiple antennas. Synchronization signal acquisition method. In the method for generating a timing synchronization signal through a timing module provided in each of the transmission and reception system for measuring a wireless channel having multiple antennas, and measuring the wireless channel, Separating the timing module in the receiving system; Coupling an external clock terminal between the timing module of the separated receiving system and the timing module of the transmitting system; Connecting external reset signal terminals between the timing module of the transmitting system and the receiving system with each other; Controlling phase synchronization of a clock in each timing module; Setting the same counter value for counting clocks generated by each timing module; Generating a timing synchronization signal synchronized with each other by counting clocks generated in the timing module of the transmission and reception system according to the set counter value by the reset signal; Disconnecting a connection between the timing module of the receiving system and the timing module of the transmitting system, and mounting the timing module to the receiving system; Performing radio channel measurements of the multiple antennas in timing modules of the transmitting and receiving systems, respectively Method of obtaining a timing synchronization signal in a wireless channel measurement system using a multiple antenna comprising a. The method of claim 7, wherein In the controlling of the phase synchronization of the clock, an external computer connected to the timing module of the receiving system controls the synchronization of the clock and monitors the timing in the wireless channel measurement system using multiple antennas. Synchronization signal acquisition method. The method of claim 7, wherein Performing the radio channel measurement, Setting the radio channel measurement parameters in a timing module of the transmission and reception system, respectively; Generating a channel measurement start signal at each timing module of the transmission and reception system; Generating a transmission and reception antenna switching timing signal based on the timing synchronization signal according to the channel measurement start signal in each timing module, and performing wireless channel measurement of the multiple antennas accordingly. A method of acquiring timing synchronization signals in a wireless channel measurement system using multiple antennas. The method of claim 9, The method, After performing the radio channel measurement, modifying and changing the radio channel measurement parameter, and performing the radio channel measurement again. How to get a call.

Images