Patent ID: 6690715
Filing Date: 2004-02-10
Classification: H04B,H04L

Abstract:
A RAKE receiver for a direct sequence spread spectrum receiver employable in a multipath environment, comprising:a channel matched filter that receives codewords of pluralities of direct spreading chips; a differential combiner having a first input coupled to said channel matched filter and a second input that receives a post-cursor representative echo signal; a codeword correlator, coupled to an output of said differential combiner, that detects different codewords of pluralities of direct spreading chips; a codeword decision operator, coupled to an output of said codeword correlator, operative to generate a decision as to what codeword was transmitted in accordance with the contents of direct spreading chips in a respective received codeword; a codeword synthesizer, coupled to said codeword decision operator, that synthesizes a replica of the chip contents and phase information of a decided transmitted codeword; and an estimated channel impulse response filter, coupled to said codeword synthesizer and said differential combiner, operative to convolve said synthesized replica with an estimate of said channel impulse response to provide said post-cursor representative echo signal.