Time division duplex transceiver

Pulse or digital communications – Transceivers

Patent

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Details

455 78, H04L 516, H04B 138

Patent

active

054467705

ABSTRACT:
A transceiver for transmitting and receiving a signal having the same frequency according to a time-division includes a local oscillator for generating a local signal having a first frequency, a frequency converter for converting the local signal into a carrier signal, a modulator for modulating the carrier signal by using a transmitting baseband signal so as to generate a transmitting signal having a second frequency and a receiving section for receiving a receiving signal having the second frequency which is the same as that of the transmitting signal. The frequency convertor includes a fractional frequency convertor for converting a signal having an input frequency into a signal having an output frequency. Wherein, the output frequency is n.sub.2
.sub.1 times the input frequency, where n.sub.1 is an integer greater than 2, n.sub.2 is an integer greater than 1, n.sub.1 and n.sub.2 being relatively prime, whereby the second frequency of the transmitting signal is not any integral multiple of the first frequency of the local signal. In receiving operation of the transceiver, the operation of the frequency convertor is terminated.

REFERENCES:
patent: 4434505 (1984-02-01), Gutleber
patent: 4520474 (1985-05-01), Vilmur
patent: 4754450 (1988-06-01), Lynk et al.
patent: 5020051 (1991-05-01), Beesley et al.
patent: 5123008 (1992-06-01), Beesley
patent: 5140697 (1992-08-01), Igarashi
patent: 5187722 (1993-02-01), Petty
patent: 5267233 (1993-11-01), Bauerschmidt
patent: 5276913 (1994-01-01), Lee et al.
patent: 5319799 (1994-06-01), Morita

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