Digital receiver capable of processing modulated signals at various data rates

Abstract

A digital receiver is enabled to process modulated signals at various data rates including a sampling circuit for receiving modulated signals and outputting digitalized sampled signals, a matched filter for expelling noise from digitalized sampled signals at a first data rate and at a second data rate and generating in-phase and quadrature-phase signals, a barker code correlator for depreading digitalized sampled signals at first data rate, a channel equalizer which counteracts co-channel interferences by using equalizer coefficients obtained from a plurality of noise whitening coefficients so as to generate a sequence of symbol decisions therefrom, a CCK correlator coupled to the channel equalizer for decoding signals at the second data rate and at a third data rate, a first quantization filter for recovering transmitted signals at the first data rate, and a second quantization fitler for recovering transmitted signals at the second data rate and at the third data rate.