Wireless data transceiver

Details Wireless data transceiver Wireless data transceiver

1996-03-17

1996-02-20

Chin, Stephen

Pulse or digital communications

Transceivers

375296, 375316, 455 86, H04B 138, H04L 516

Patent

active

054935830

ABSTRACT:
A full duplex data transceiver for transmitting and receiving frequency-modulated ("FM") signals representing binary data includes separate transmit and receive antennas, and a single oscillator which serves as both the radio frequency ("RF") signal source for the transmitter and the local oscillator ("LO") signal source for the receiver. During signal transmission, the oscillator output is frequency-modulated to provide a FM transmit signal to the transmit antenna. The oscillator output is frequency-modulated with binary transmit data by modulating an error feedback signal which serves as the control voltage for a voltage-controlled oscillator in a phase-lock-loop, thereby producing the FM transmit signal. During signal reception, the oscillator output, in the form of the transmitted FM signal, is received via the receive antenna along with a FM receive signal for mixing therewith to down-convert the FM receive signal. As part of the demodulation of the down-converted FM receive signal, the binary transmit data is subtracted out.

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