Digital radio communication apparatus

Details Digital radio communication apparatus Digital radio communication apparatus

Filed on

1992-05-29

Date issued

1994-04-26

Examiner

Chin, Stephen

Patent Class

Pulse or digital communications

SubClass

Repeaters

SubSubClass

Testing

Other Related Categories

375 53, 455 86, 455 87, H04B 148

Type

Patent

Status

active

Patent number

053073789

Description

ABSTRACT:
A digital radio communication apparatus includes a reception system and a transmission system. The reception system includes a first frequency converter and a quadrature demodulator. The first frequency converter frequency-converts a reception signal and outputs the converted signal as a first IF signal. The quadrature demodulator performs quadrature demodulation of the first IF signal. The transmission system includes a quadrature modulator and a second frequency converter. The quadrature modulator performs quadrature modulation of a transmission signal and outputs the modulated signal as a second IF signal. The second frequency converter frequency-converts the second IF signal and transmits the converted signal. The frequency difference between the first and second IF signals is set to coincide with the frequency interval between a transmission frequency and a reception frequency. The frequency of one of the first and second IF signals is set to be an integer multiple of the frequency of the other IF signal.

REFERENCES:
patent: 3965421 (1976-06-01), Bates
patent: 4231116 (1980-10-01), Sekiguchi et al.
patent: 4373205 (1983-02-01), Mizota
patent: 4627099 (1986-12-01), Shimakata
patent: 4700151 (1987-10-01), Nagata

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