Frequency modulator for data transceiver

Details Frequency modulator for data transceiver Frequency modulator for data transceiver

1994-08-08

1996-08-27

Chin, Stephen

Pulse or digital communications

Transmitters

375302, 455119, H04L 2704

Patent

active

055508650

ABSTRACT:
A full duplex data transceiver for transmitting and receiving trinary 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. The FM transmit and receive signals are trinary (f.sub.-P, f.sub.c, f.sub.+P) and represent encoded binary data. The center frequency f.sub.c corresponds to an absence of a binary data signal transition, the lower peak frequency f.sub.-P corresponds to a negative binary data signal transition and the upper peak frequency f.sub.+P corresponds to a positive binary data signal transition.

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