Patent ID: 6560293
Filing Date: 2003-05-06
Classification: H03C,H04L

Abstract:
A data transmission system, the system comprising:an envelope modulating data encoder having input and output terminals, where the encoder is configured to receive a binary data stream at the input terminal and, responsive thereto, generate an envelope modulated data signal at the output terminal; a mixer having first and second input terminals and an output terminal, the first input terminal being coupled to the output terminal of the envelope modulating data encoder, the second input terminal being configured to receive a mixing frequency, and where the mixer is configured to mix the envelope modulated data signal and the mixing frequency in order to generate upper and lower sideband transmit data signals at the output terminal of the mixer; a lowpass filter having input and output terminals, the input terminal being coupled to the output terminal of the mixer, where the lowpass filter is configured to pass the lower sideband transmit data signal generated by the mixer to the output terminal of the lowpass filter; and a frequency modulator having input and output terminals, the input terminal being coupled to the output terminal of the lowpass filter, where the frequency modulator is configured to frequency modulate a radio frequency carrier responsive to the lower sideband transmit data signal received from the lowpass filter in order to generate a frequency modulated data signal.