JPH056811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a failure detection method for a diversity receiver in mobile communications.

[Conventional technology]

BACKGROUND ART Conventionally, as a method for detecting a failure in a receiver in mobile communication, a method has been adopted in which a failure in the receiver is detected by transmitting a test radio wave and receiving it at the receiver.

FIG. 2 is a block diagram of an example of this conventional receiver fault detection method, and shows a line test method in a car telephone system. In Figure 2, 1
1 is a test transceiver control section, 12 is a test transceiver, 13 is a test transceiver antenna, 14 is a base station transceiver antenna, 15 is a base station transceiver, and 16 is a base station control section.

In such a configuration, the base station transceiver 15
In order to detect a failure, first, the test transceiver 12 emits radio waves requesting a response signal. This signal is received by the base station transceiver 15, further analyzed by the base station control section 16, and an appropriate signal is sent out from the base station transceiver 15. By receiving this transmitted signal at the test transceiver 12, it is confirmed that the communication system is normal. At this time, if the base station transceiver 15 is at fault, a normal signal will not be received by the test transceiver 12 and it will be detected as a fault.

[Problem that the invention seeks to solve]

When the conventional fault detection method described above is applied to a diversity receiver, a test must be performed on each of the multiple receivers included in one diversity receiver, which is time consuming and uneconomical. In addition, this method has the disadvantage that failures can only be detected when a test is performed, and failures cannot be detected for transceivers that are in operation.

An object of the present invention is to provide a failure detection method for a diversity receiver that eliminates these drawbacks, allows easy testing, and allows failures to be detected even in operating transceivers. be.

[Means for solving problems]

The configuration of the present invention includes a plurality of wireless receiving units each having a circuit for detecting the instantaneous value of received electric field strength, and each instantaneous value from these wireless receiving units is compared, and the demodulated output of the receiving unit with the largest instantaneous value is selected. and means for outputting short-term average values of instantaneous values of received electric field strengths from the plurality of wireless receiving units, and averaging means for outputting short-term average values of instantaneous values of received field strengths from the plurality of radio reception units, and these average values. and comparing means for comparing each average value of the short-term average value within the same time period and outputting a short-term average value that is significantly different from other short-term average values as a failure of the diversity receiver. shall be.

[Principle of the invention]

In the diversity receiver used to reduce multipath fading in mobile communications according to the present invention, the instantaneous values of the received electric field strengths of the plurality of reception sections differ greatly depending on each reception section, but the short-term average Since the values are almost the same between each receiving section, the short-term average values of the received electric field strength of multiple receiving sections are compared, and among these short-term average values that are extremely different, the short-term average values are detected as a fault. be.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. This embodiment includes a plurality of innumerable receivers 1 that perform diversity reception, a comparator circuit 4 that compares the electric field strengths 3 of these receivers 1, and a switch that switches the demodulated output 2 by a selection symbol of the comparison output. It is composed of a circuit 6, an averaging circuit 8 that averages each electric field strength 3, and a comparison circuit 9 that compares the outputs of these averaging circuits 8 and outputs fault information 10. The plurality of radio receiving units 1 of this embodiment output a demodulated output 2 and a field strength signal 3 indicating the instantaneous value of the received field strength. The comparison circuit 4 compares the instantaneous values 3 of the received electric field strengths, selects the signal from the receiving section 1 with the largest value, and outputs a selection symbol 5 for selecting the receiving section 1. The switching circuit 6 selects the selection symbol 5 from the comparison circuit 4.
Accordingly, the demodulated output 7 of the radio receiving section 1 is output. Further, each averaging circuit 8 outputs a short-time average value of each received electric field strength 3, and a comparator circuit 9 constantly compares the outputs of these averaging circuits 8, and calculates the difference between the average output and the average output of other receiving sections 1. It operates to output fault information 10 when it becomes significantly large.

〔Effect of the invention〕

As described above, the present invention is effective in detecting receiver failure by comparing short-term average values of received field strengths of a plurality of radio receiving sections of a diversity receiver.

According to this method, a failure in the diversity receiver can be detected even when the receiver is in operation by simply providing an additional circuit. Furthermore, according to this method, it is also possible to determine which radio receiving section among a plurality of radio receiving sections is at fault, and when used in combination with conventional testing methods, reliable fault detection becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a fault detection method according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional fault detection method. 1... Radio receiving section, 2... Demodulation output, 3... Instantaneous value of received field strength, 4... Comparison circuit, 5... Selection symbol, 6... Switching circuit, 7... Demodulation output after selection, 8 ...Averaging circuit, 9...Comparison circuit, 10
...Failure information, 11...Test transceiver control unit,
12...Test transmitter/receiver, 13...Test transmitter/receiver antenna, 14...Base station transmitter/receiver antenna, 15
...Base station transceiver, 16...Base station control unit.

Claims (1)

[Claims] 1. A plurality of wireless receiving units having a circuit for detecting instantaneous values of received electric field strength, and means for comparing the instantaneous values from these wireless receiving units and selecting and outputting the demodulated output of the receiving unit with the largest instantaneous value. A failure detection method for a diversity receiver comprising: averaging means for outputting short-time average values of instantaneous values of each received electric field strength from the plurality of radio receiving units; Comparing means for comparing each average value within the same time and outputting a short-term average value that is significantly different from other short-term average values as a failure of the diversity receiver. Fault detection method for city receiver.