Patent ID: 6108367
Filing Date: 2000-08-22
Classification: G06K,H04B

Abstract:
A communications system for communicating a serial data stream from a first device to a second device, the first and second device being physically separate from each other;the second device comprising a transmitter transmitting an RF signal modulated by a spread-spectrum modulation;the first device comprising an antenna coupled to a two-terminal nonlinear component, an oscillator, the oscillator having an output defining an offset frequency; and a mixer responsive to the serial data stream for selectively coupling the oscillator output to the nonlinear component in response thereto; andthe second device further comprising a receiver receiving RF energy present at a sideband offset from the transmitted signal by the offset frequency, and a spread-spectrum demodulator demodulating the received RF energy with respect to the spread-spectrum modulation of the transmitter, and a second demodulator demodulating the demodulated signal, yielding the serial data stream.