Patent ID: 6671311
Filing Date: 2003-12-30
Classification: H04B,H04L

Abstract:
A receiver for use in a code shift keying spread spectrum communication system comprising:a front end circuit coupled to a channel and adapted to filter a receive input signal into N streams, each receive sample stream associated with one of said frequency bands; N receiver circuits coupled to said front end circuit, each receiver circuit associated with a frequency band, each receiver circuit comprising: a template comprising a plurality of taps; initialization means operative to generate an initial value for said template from a plurality of training symbols stripped of rotation and phase whereby said template is initialized to said channel; means for generating receive symbols from a corresponding one of said receive sample streams; a correlator adapted to correlate the contents of said template with said received symbols, said correlator operative to generate a correlation sum for each relative rotation between said templated and said received symbols, for all possible transmitted rotations of a symbol; a combiner for combining the correlation sums generated by said N receiver circuits so as to yield a total correlation value; a maximum correlator detector operative to determine a shift index corresponding to a maximum total correlation value over all rotations of said template, said shift index subsequently decoded to yield receive data; and wherein N is a positive integer.