Abstract
The optimization between the processing gain and the coding gain of a constant-bandwidth direct-sequence spread-spectrum communication system operating in the presence of either a tone jammer or a Gaussian jammer such that the bit-error rate (BER) is minimized is presented. Both bipolar phase-shift keyed pseudo-noise (PN) modulation and quaternary phase-shift keyed PN modulation are considered. Binary BCH codes are used to illustrate the techniques for optimization. The exact BER and its Gaussian approximation are derived and compared. During the optimization, two different approaches are used to obtain the indicator functions of the optimum code. These indicators are tested and shown to yield good results. >
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