Soft decision diversity coded DS/DPSK systems in pulse-jammed multipath-fading channels
Victory, Charles W.
Therrien, Charles W.
Ha, Tri T.
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The performance of a Direct Sequence Spread Spectrum system utilizing Differential Phase Shift-Keying modulation over a fading channel in the presence of pulse noise interference and additive white Gaussian noise is considered. Time and spatial diversity receivers utilizing various normalization schemes and post-detection selection combining are employed to overcome performance limitations inherent in the adverse environments. Numerical results are presented over a range of environmental conditions demonstrating the efficacy of such receivers. The performance analysis is extended through the utilization of convolutional coding and soft decision Viterbi decoding. Here the performance of the maximum likelihood decoding operation is expressed in terms of an equivalent uncoded system for both the Rayleigh and Rician fading channel with interference effects. Numerical results are then presented demonstrating the efficacy of such a receiver.
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