Patent ID: 6104747
Filing Date: 2000-08-15
Classification: H04B

Abstract:
A method for determining an optimum number (Nopt) of complex samples for coherent averaging of a complex signal S(n) in a spread spectrum communication system comprising the steps of:a. estimating an initial number (Nint) of complex samples;b. obtaining fading channel autocorrelation sequence (R(n)) for a plurality (n) of complex samples, the number of said plurality (n) of complex samples corresponding to said initial number (Nint) of complex samples;c. computing a constant (K) based on said autocorrelation sequence (R(n)), said initial number (Nint) of complex samples and the number of said plurality (n) of complex samples;d. substituting said initial number (Nint) of complex samples for said optimum number (Nopt) of complex samples if said constant (K) is equal to zero;e. performing coherent averaging of the complex signal by a receiver in the spread spectrum system based on the optimum number of complex samples determined in steps ""a-d"", in order to reduce the effect of Doppler phase rotation and noise variance.