JP2007208349A - Testing system for radio - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a testing system for radios capable of generating interfering waves and a signal for inspecting a television reception function, or the like incorporated into a communication terminal additionally by a single unit of inspection apparatus. <P>SOLUTION: In the testing system for radios for inspecting the performance of radios by using a tester for radios, a baseband signal generator for inspecting at least interfering waves and radio reception functions, including television reception function and GPS reception function have been incorporated into the tester for radios. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a test system for a radio device (for example, a mobile phone), and generates a disturbing wave necessary for testing adjacent channel selectivity and blocking characteristics, and additionally includes a television reception function incorporated in a communication terminal. The present invention relates to a test system capable of generating a test signal for a wireless reception function.

  Conventionally, as one of the items for testing the performance of a mobile phone, there are tests of adjacent channel selectivity and blocking characteristics. FIG. 2 is a block diagram showing an example of a radio test system used for such a test.

  In FIG. 2, 21 is a mobile phone as a terminal to be inspected, 22 is a circulator, 23 is a power combiner, 24 is a mobile phone tester, 25 is an RF signal generator, and 26 is a control PC. In the configuration described above, in order to test the adjacent channel selectivity and the blocking characteristic, it is necessary to add an interference wave in addition to a signal for communication with the terminal 1 to be inspected.

  That is, the interference signal generated by the RF signal generator 25 is added to the transmission signal from the mobile phone tester 24 by the power combiner 23, and the transmitted / received signal is separated by the circulator 22 and connected to the inspected terminal 1.

  In order to perform an automatic inspection, it is necessary to operate the mobile phone tester 24 and the RF signal generator 25 in a coordinated manner. Therefore, usually, the control PC 26 is connected to the mobile phone tester 24 and the RF signal generator 25 using the GP-IB 27 and the like, and the inspection is performed by executing the automatic inspection software on the control PC 26.

FIG. 3 is a block diagram showing another conventional example.
In FIG. 3, terminals 1 and 2 to be inspected are mobile phones, and are connected to terminal control units 5 and 6 via a connection unit 17 and a signal switching unit 3.

  The terminal controllers 5 and 6 have the same hardware configuration and have a RAM and a CPU (not shown). These terminal control units 5 and 6 function as pseudo base stations for the terminals 1 and 2 to be inspected.

  The test signal generators 5a and 6a generate baseband signals of I (t) and Q (t) based on a predetermined clock, and the baseband signals are transmitted to the terminals 1 and 2 to be inspected. Control information necessary for working as a pseudo base station is included. The control information includes instructions necessary for location registration, incoming call, disconnection, and other tests exchanged between the inspected terminals 1 and 2 and the pseudo base station.

  The RF units 5b and 6b modulate the test signals, which are modulated with the baseband signals from the test signal generating units 5a and 6a, and converted into the same communication method and frequency as the terminals 1 and 2 to be tested, to the terminals 1 and 2 to be tested. At the same time, a response signal is received from the terminals 1 and 2 to be inspected that have received the test signal, and is sent to the measuring units 7 and 8.

  The measurement units 7 and 8 receive IF (intermediate frequency) signals from the RF units 5b and 6b, orthogonally demodulate them to convert them into I (t) and Q (t) signals, and then decode them in the decoding unit for data analysis. Analysis for measurement is performed in the section.

  The signal switching unit 3 includes switches S1 to S4 and is located between the terminal control units 5 and 6, the measurement units 7 and 8, and the terminals 1 and 2 to be inspected. The switching for changing the combination corresponding to the number of data, the type of communication method, the measurement item, the measurement method, etc. is schematically shown.

The total control unit 9 includes a program management unit 10, a measurement control unit 11, a data processing unit 12, and a display control unit 14.
The program management unit 10 stores in advance a program for the terminal control units 5 and 6 to perform control corresponding to the communication method of the terminals 1 and 2 to be inspected in the memory 10a, and instructs the measurement control unit 11 to To output the necessary program.

  The measurement control unit 11 reads out the program from the memory 10a according to the communication method of the terminals 1 and 2 to be inspected, sends the program to the terminal control units 5 and 6, and also according to the measurement (test) item, the common bus 4 to control each part. The measurement units 1 and 2 and the terminal control units 5 and 6 are connected to the common bus 4.

The data processing unit 12 processes and manages the data measured by the measurement units 7 and 8 and stores the data in the data memory 13.
Upon receiving an instruction from the measurement control unit 11, the display control unit 14 performs display for guiding measurement items, measurement procedures, operations, and the like, displays a data format, and displays measured data.

  The external interface 16 is an interface for external control and is connected to the measurement control unit 11. The measurement control unit 11 controls the plurality of terminal control units 5 and 6 and the measurement units 7 and 8 collectively. Yes.

  The display unit 15 displays the measurement result and the control information that is the measurement instruction for each of the terminals 1 and 2 to be inspected. The measurement result is stored in the data memory 13 for each of the terminals 1 and 2 to be inspected. Upon receiving an instruction from the operation unit 18, the display control unit 14 reads out from the data memory 12, performs display control, and displays on the display unit 15. Let

  In addition, as a prior art of a radio equipment test system, for example, there is one shown in the following patent document.

JP 2005-12274 A

  In the conventional example shown in FIG. 2 described above, the RF signal generator 25 and the control PC 26 are required in addition to the mobile phone tester 24, and there is a problem that the size, cost, and power consumption of the inspection system increase.

  Further, a power combiner 23 and a circulator 22 are separately required between the terminal 1 to be inspected and the mobile phone tester 24 / RF signal generator 25. In order to guarantee the level accuracy of the signal applied to the terminal 1 to be inspected, There is also a problem that calibration is required to guarantee the loss caused by the power combiner 23 and the circulator 22.

In the conventional example shown in FIG. 3, since the test can be performed by the mobile phone tester alone, there is no problem as in the conventional example shown in FIG. 2, but one of the terminal control units 5 and 6 is used for generating the interference wave. There is a problem in that one of the measurement units does not operate during use.
Further, since the terminal control units 5 and 6 only support the mobile phone communication system, there is a problem that signals of other communication / broadcasting systems cannot be generated.

  Therefore, the present invention incorporates an RF signal generator into a mobile phone tester, and provides a radio wave such as an interference wave required for testing adjacent channel selectivity and blocking characteristics, and a television reception function additionally incorporated in a communication terminal. An object of the present invention is to provide a radio test system capable of generating a reception function test signal with a single test device.

The present invention was made to solve the above problems, and in the invention of the test system for a radio device according to claim 1,
In a radio device test system for inspecting the performance of a radio device using a radio device tester, the radio device tester is configured to inspect a radio reception function including at least an interference wave, a television reception function, and a GPS reception function. A baseband signal generator is incorporated.

In claim 2, in the invention of the test system for a radio device according to claim 1,
Signals for the interference wave inspection and the wireless reception function inspection are switched for each inspection using a measurement control means for controlling an output signal of the baseband signal generator.

  According to a third aspect of the present invention, in the invention of the radio system test system according to the first or second aspect, there is provided display means for displaying the progress of the inspection and the measurement result at the measurement unit.

  According to a fourth aspect of the present invention, in the invention of the radio system test system according to any one of the first to third aspects, the wireless device is a mobile phone.

As is apparent from the above description, according to claims 1 to 4 of the present invention, the following effects can be obtained.
In a radio device test system for inspecting the performance of a radio device using a radio device tester, the radio device tester is configured to inspect a radio reception function including at least an interference wave, a television reception function, and a GPS reception function. Since a baseband signal generator is incorporated, it is possible to generate interference signals necessary for testing adjacent channel selectivity and blocking characteristics, and test signals such as television reception functions and GPS reception functions incorporated in communication terminals. Can be generated by the inspection equipment on the table.
In addition, since a circuit necessary for adding an interference wave is included in the inspection apparatus, it is not necessary to perform calibration externally.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 32 is a mobile phone tester, which automatically inspects the terminal 1 to be inspected.
In the mobile phone tester 32 of the present invention, the communication control unit 43 controls the test signal generator 48 to generate a transmission baseband signal to the terminal 1 to be inspected in order to communicate with the terminal 1 to be inspected.

  The baseband signal is modulated by the RF transmission unit 47 and input to the terminal 1 to be inspected via the signal switching unit 31. In the signal switching unit 31, the power combiner 23 adds the transmission signal from the RF transmission unit 47 and the interference signal from the RF signal generation unit 41, and then outputs the signal via the circulator 22.

In the circulator 22, a test transmission signal is output to the inspected terminal 1, and at the same time, a transmission signal from the inspected terminal 1 is input to the RF receiver 39.
The transmission signal of the terminal 1 to be inspected is frequency-converted by the RF receiving unit 39 to be an IF signal and input to the measuring unit 40.

The measuring unit 40 demodulates the IF signal and sends a response from the terminal 1 to be inspected to the test signal generating unit 48. At the same time, the transmission power and spectrum of the terminal 1 to be inspected are measured.
When testing the adjacent channel selectivity and blocking characteristics, the measurement control unit 43 controls the baseband signal generation unit 42 to generate a baseband signal of an interference wave.

This baseband signal is modulated by the RF signal generation unit 41 to become an RF signal, and is added to the measurement transmission signal by the signal switching unit 31 and output.
In the signal switching unit 31, the high frequency switch 36 is switched, and the interference signal from the RF signal generator 41 is input to the power combiner 23.

  On the other hand, when testing the television reception function and GPS reception function mounted on the terminal 1 to be inspected, the measurement control unit 43 controls the baseband signal generation unit 42 to generate a television or GPS baseband signal. . This baseband signal is modulated by the RF signal generation unit 41 to become an RF signal, which is output through the signal switching unit 31.

  The signal switching unit 31 switches the high frequency switch 36 and outputs the RF signal from the RF signal generator 41 to the outside (portion indicated by a dotted line). The measurement control unit 43 displays the progress of the examination and the measurement result of the measurement unit 40 on the operation / display control unit 44.

  According to the above configuration, since the RF signal generator capable of generating the interference wave and various test signals is incorporated in the mobile phone tester, the interference wave required for the adjacent channel selectivity and blocking characteristics test, One inspection device can generate inspection signals such as a television reception function incorporated in the inspection terminal 1. Furthermore, since a circuit necessary for adding an interference wave is included in the inspection apparatus, it is not necessary to perform calibration externally.

In this embodiment, the circulator is used to separate the transmission signal and the reception signal, but a power splitter may be used.
In this embodiment, the frequency is converted into the IF signal by the RF receiver, but it may be demodulated to be a baseband signal.

  In this embodiment, the baseband signal generator 42 can be an arbitrary waveform generator that repeatedly outputs waveform data created in advance. Further, by creating the waveform data with software on the PC, a new test signal can be generated without changing the hardware.

  In this embodiment, a digital signal processor can be incorporated in the baseband signal generator 42, and digital data can be digitally modulated in real time to generate a test signal. In this case, a test signal having a long repetition period can be created at low cost.

  In this embodiment, the RF transmitter 47, the RF receiver 39, and the RF signal generator 41 are displayed as independent blocks. However, by sharing a part that generates a reference signal or the like that is commonly used in each block, , Circuit scale, power consumption and cost can be reduced.

  The present invention incorporates an RF signal generator in a mobile phone tester, and in the adjacent channel selectivity and blocking characteristics test, an RF signal generator generates an interference wave and adds it to the communication signal with the terminal to be inspected. When testing a television reception function or the like additionally incorporated in a communication terminal, since the test signal generated by the RF signal generator is output independently, the interfering wave addition test and the terminal can be performed with a single test device. It is possible to realize a radio test system capable of performing both additional function tests.

  The above description merely shows a specific preferred embodiment for the purpose of explanation and illustration of the present invention. In the present invention, a mobile phone is used as a radio, but other mobile radios may be used. Therefore, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.

It is a block diagram of the radio | wireless machine test system which shows one Example of this invention. It is a block diagram which shows the prior art example of the test system for radio | wireless machines. It is a block diagram which shows the other conventional example of the test system for radio | wireless machines.

Explanation of symbols

1,1a Inspected terminal (mobile phone)
3, 31 Signal signal switching unit 4 Common bus 5, 6 Terminal control unit 7, 8, 40 Measurement unit 9 Total control unit 10 Program management unit 10a Memory 11, 43 Measurement control unit 12 Data memory 13 Data processing unit 14 Display control unit DESCRIPTION OF SYMBOLS 15 Display part 16 External interface 18 Operation part 22 Circulator 23 Power combiner 24, 32 Cellular phone tester 25 Signal generator 26 Control PC
27 GP-IB
36 RF switch 39 RF receiver 41 RF signal generator 42 BB signal generator 43 Measurement controller 44 Display / operation controller 47 RF transmitter 48 Test signal generator

Claims (4)

  In a radio device test system for inspecting the performance of a radio device using a radio device tester, the radio device tester is configured to inspect a radio reception function including at least an interference wave, a television reception function, and a GPS reception function. A radio test system that incorporates a baseband signal generator.   2. The radio test system according to claim 1, wherein the radio reception function test signal is switched for each test using a measurement control means for controlling an output signal of the baseband signal generator.   3. The radio test system according to claim 1, further comprising display means for displaying the progress of the inspection and the measurement result at the measurement unit. 4. The radio test system according to claim 1, wherein the radio device is a mobile phone.

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