JPH06334572A - Time diversity receiver - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution and reduce the power consumption of the receiver by performing time diversity processing with a sampled value of a detector output without reception level detection. CONSTITUTION:This receiver is equipped with an antenna 1, a receiver demodulator 2 which receives and demodulates a signal received through the antenna 1, an A/D converter 5 as a sampling circuit which samples the detector output, a memory 7 which stores the sampled value, a signal processing part 9 which performs the time diversity processing, and a code decision unit 10. This signal processing part 9 compares the absolute value of the sampled value of the detector output corresponding to a signal received by resending with the absolute value of the sampled value of the detector output corresponding to a signal that is received up to the last time and stored in the memory 7, code by code, as to the same received signal and selects the sampled value which is larger in absolute value. The sampled value after this time diversity reception processing is written in the memory 7 and also outputted to the code decision unit 10 which decides the codes, one by one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for time diversity reception for high quality signal transmission in radio communication with fading. INDUSTRIAL APPLICABILITY The present invention is used for a mobile device in mobile communication such as radio selective calling.

[0002]

2. Description of the Related Art FIG. 2 shows a configuration of a receiver for performing time diversity reception using a conventional reception level. In this case, the operation on the transmitting side transmits the same code signal a plurality of times.

In FIG. 2, a case of receiving a binary code will be described as an example.

The signal received via the antenna 1 is input to the reception / demodulator 2 and the reception level detector 3.
The detector output signal output from the reception / demodulator 2 is subjected to code determination by the code determination unit 4 as binary data (0 or 1), and then input to the signal processing unit 6 that performs time diversity processing. The reception level signal output from the reception level detector 3 is sampled by the A / D converter 5 and then input to the signal processing unit 6. The signal processing unit 6 is
The reception level sample value received this time and the reception level sample value of the signal received up to the previous time stored in the memory 7 are compared for each code, and the binary data corresponding to the higher reception level sample value is selected. Perform time diversity processing. Further, after the completion of the time diversity reception process, the signal processing unit 6 stores the sampled value and the binary data corresponding to the sampled value in the memory 7 and outputs it to the terminal 8 as an output. By repeating the above operation, high quality signal transmission can be realized in the mobile communication transmission line with fading.

[0005]

However, as described above, the reception level detector 3 is required to perform the time diversity reception process capable of realizing high quality transmission.
There are problems that the circuit becomes complicated and the power consumption increases.

An object of the present invention is to provide a time diversity receiver capable of reducing the power consumption by eliminating the factors of the increase in the power consumption and the complexity of the circuit configuration by the reception level detector. To do.

[0007]

SUMMARY OF THE INVENTION The present invention is a time diversity receiver including time diversity processing means for receiving the same code signal a plurality of times and performing diversity processing,
The time diversity processing means is characterized by performing time diversity reception processing using a detector output for a signal received by retransmission and a detector output for a signal received up to the previous time.

A sampling circuit for sampling the detector output and a memory for storing the sampled value are provided, and the time diversity processing means has an absolute value of the sampled value of the detector output with respect to the signal received by retransmission. And means for comparing the absolute value of the sample value of the detector output with respect to the signal received up to the previous time stored in the memory for each code with respect to the same received signal, and the sample value with the larger absolute value. Means for selecting.

The sampling circuit for sampling the detector output and a memory for storing the sampled value are provided, and the time diversity processing means includes the sampled value of the detector output for the signal received by the retransmission, and Means for adding the sampled value of the detector output for the signal received up to the previous time stored in the memory for each code for the same received signal.

[0010]

According to the present invention, the time diversity processing is performed on the sample value of the detector output without performing the reception level detection.

As the time diversity processing, the absolute value of the sample value of the detector output of the signal received this time is compared with the absolute value of the sample value of the detector output up to the previous time, and the larger sample value is selected. Perform time diversity processing. At the same time, the sample value after the time diversity reception process is written in the memory and the code determination is performed for each code.

Further, instead of comparing sample values, time diversity processing by addition processing can be performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing the configuration of the time diversity receiver of the present invention, which includes an antenna 1, a reception / demodulator 2 for receiving and demodulating a reception signal received via the antenna 1, and a detector output. A as a sampling circuit for sampling
The D / D converter 5, the memory 7 that stores the sampled value, the signal processing unit 9 that performs time diversity processing, and the code determination unit 10 are provided, and the signal processing unit 9 responds to a signal received by retransmission. Means for comparing the absolute value of the sample value of the detector output and the absolute value of the sample value of the detector output for the signal received up to the previous time stored in the memory for each code for the same received signal, It includes means for selecting the sample value having the larger absolute value, and means for writing the sample value after the time diversity reception processing in the memory and outputting it to the code judging unit 10 for judging the code for each code.

Next, the operation of the receiver of this embodiment will be described. In this embodiment, the case of receiving a binary code will be described as an example.

The signal received via the antenna 1 is input to the reception / demodulator 2. The detector output signal output from the reception / demodulator 2 is sampled for each code in the A / D converter 5, and then input to the signal processing unit 9. The signal processing unit 9 calculates, based on the sample value X of the signal received this time for each code and the sample value Y of the same signal received from the memory 7 up to the previous time, Z for satisfying the following equation (1). Perform processing.

| Z | = max (| X |, | Y |) (1) Further, the signal processing unit 9 stores the sample value Z in the memory 7 after the end of the time diversity reception, and determines the sign. Output to the container 10. The sign determiner 10 also determines the sign of the sampled value Z as binary data (0 or 1) and outputs the binary data to the terminal 8. By repeating this operation, high quality signal transmission can be realized in the mobile communication transmission line with fading.

The time diversity receiver of the above-described embodiment enables the time diversity reception process by applying only the detector output without performing the reception level detection.

(Second Embodiment) Next, a second embodiment of the present invention will be described. The configuration of the receiver is the same as that of the first embodiment, and the time diversity reception processing in the signal processing unit 9 is different from that of the first embodiment.

The operation will be described. The operation on the transmitting side is to transmit the same code signal as a conventional one a plurality of times.
The case where the receiver receives a binary code will be described as an example.

The signal received via the antenna 1 is input to the reception / demodulator 2. The detector output signal output from the reception / demodulator 2 is sampled for each code in the A / D converter 5, and then input to the signal processing unit 9. The signal processing unit 9 calculates a Z satisfying the following expression (2) from the sampled value X of the signal received this time for each code and the sampled value Y of the same signal received from the memory 7 up to the previous time. Perform processing.

Z = X + Y (2) Further, the signal processing unit 9 stores the sampled value Z in the memory 7 and outputs it to the code determination unit 10 after the time diversity reception process is completed. Also, the code determiner 10
Judges the sign of the sampled value Z as binary data, and outputs this binary data to the terminal 8. By repeating the above operation, high quality signal transmission can be realized in the mobile communication transmission line with fading.

The time diversity receiver of the above-described embodiment enables the time diversity reception process by applying only the detector output without detecting the reception level.

In the above-described first and second embodiments, the operation has been described by taking the case of receiving a binary code as an example, but the present invention also applies to the case of receiving a code of three or more values. It is valid. In this case, the code determiner may correspond to the number of values of each code.

[0026]

As described above, according to the present invention, since the time diversity reception processing is performed only from the detector output,
The circuit related to reception level detection is no longer necessary, so
Since the circuit configuration is simplified and the power consumption related to the reception level detection circuit is eliminated, the power consumption of the receiver can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a time diversity receiver according to a first embodiment and a second embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional time diversity receiver that performs time diversity reception processing by detecting a reception level.

[Explanation of symbols]

 1 antenna 2 reception / demodulator 3 reception level detector 4, 10 code decision device 5 A / D converter 6, 9 signal processing unit 7 memory 8 terminal

Claims (3)

[Claims] 1. A time diversity receiver comprising a time diversity processing means for receiving the same code signal a plurality of times and performing diversity processing, wherein the time diversity processing means outputs a detector output for a signal received by retransmission and up to the previous time. A time diversity receiver characterized by performing time diversity reception processing by using a detector output for a signal received by the receiver. 2. A sampling circuit for sampling the detector output,
The time diversity processing means is provided with a memory for storing the sampled value, and the time diversity processing means stores the absolute value of the sampled value of the detector output with respect to the signal received by retransmission and the signal for the previously received signal stored in the memory. The time diversity receiver according to claim 1, further comprising means for comparing the absolute value of the sample value of the detector output with respect to the same received signal for each code, and means for selecting the sample value having the larger absolute value. 3. A sampling circuit for sampling the output of the detector,
The time diversity processing means comprises a sample value of a detector output for a signal received by retransmission and the detector for a previously received signal stored in the memory. The time diversity receiver according to claim 1, further comprising means for adding, for each code, the same sampled value as the output sample value.