Both spread-spectrum techniques and errorcorrection-coding techniques can improve the performance of digital communication systems against external interference such as jamming.However,both techniques result in bandwidth expansion.Hence,for a fixed bandwidth system there is a trade-off between how much processing gain and how much coding gain the system should employ.In this paper,a system experiencing Gaussian noise jamming is examined.A BCH code is chosen for the forward-error correction and direct sequence is used as the spreading technique.Throughout the paper,the bandwidth of the channel is assumed to be fixed.The system is optimized mathematically and a discussion of the resulting solution is then given.
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