초록 ▼

A full duplex data transceiver for transmitting and receiving trinary frequency-modulated (“FM”) signals representing binary data includes at least one antenna and a single oscillator which serves as both the radio frequency (“RF”) signal source for the transmitter and the local oscillator (“LO”) si

A full duplex data transceiver for transmitting and receiving trinary frequency-modulated (“FM”) signals representing binary data includes at least one antenna 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 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 attenuated and coupled into the receiver along with a FM receive signal from the antenna, or alternatively is received via a separate receive antenna along with the 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-P, fC, f+P) and represent encoded binary data. The center frequency fC corresponds to an absence of a binary data signal transition, the lower peak frequency f-P corresponds to a negative binary data signal transition and the upper peak frequency f+P corresponds to a positive binary data signal transition.

대표청구항 ▼

A data transceiver for transmitting and receiving modulated radio frequency (RF) signals, comprising: an antenna for transmitting a first modulated RF signal and receiving a second modulated RF signal; signal coupler means coupled to said antenna for receiving and coupling thereto a first portion of

A data transceiver for transmitting and receiving modulated radio frequency (RF) signals, comprising: an antenna for transmitting a first modulated RF signal and receiving a second modulated RF signal; signal coupler means coupled to said antenna for receiving and coupling thereto a first portion of said first modulated RF signal and for receiving and coupling therefrom said second modulated RF signal; transmitter means coupled to said signal coupler means for receiving a first modulation signal M1 and generating therefrom a second modulation signal M2, generating a RF signal having a first carrier frequency F1, modulating said RF signal in accordance with said first modulation signal M1, and providing said modulated RF signal to said signal coupler means as said first modulated RF signal; and receiver means coupled to said signal coupler means and said transmitter means for receiving via said signal coupler means said second modulated RF signal which includes a second carrier frequency F2 modulated by a third modulation signal M3, receiving further via said signal coupler means a second portion of said first modulated RF signal, and mixing said received second portion of said first modulated RF signal and said received second modulated RF signal to produce a modulated intermediate frequency (IF) signal having a modulated center frequency F3 equal to a difference │F1-F2│between said first carrier frequency F1 and said second carrier frequency F2, and further for receiving from said transmitter means said second modulation signal M2 and in accordance therewith demodulating said modulated IF signal.