Error probabilities are evaluated for direct-sequence spreadspectrum communications over channels with frequcncy-selective fading.The error probability for such a system depends on the spreading sequence,the delay spectrum for the fading process,and the receiver signal-to-noise ratio.The focus of this paper is on the effect of the spreading sequence on the performance of differentially coherent detection of binary directsequence spread-spectrum signals using a correlator receiver.It.is shown that significant performance differences result from different choices of spreading sequence.It is also shown that,given a moderate range of delay spreads,sequences can be fouud which perform well over the entire range.These are found to be robust with respect to a variety of shapes for the delay spectrum and a range of signal-to-noise ratios.
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