Performance of Convolutionally Encoded Noncoherent MFSK Modem in Fading Channels
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AbstractThe performance of a convolutionally encoded noncoherent multiple frequency shift-keyed (MFSK) modem utilizing Viterbi maximum likelihood decoding and operating on a fading channel is described. Both the lognormal and classical Rician fading channels are considered for both slow and time-varying channel conditions. Primary interest is in the resulting bit error rate as a function of E(b)/N(0) parameterized by both the fading channel and code parameters. Fairly general upper bounds on bit error probability are provided and compared with simulation results in the two extremes of zero and infinite channel memory. The efficacy of simple block interleaving in combatting channel memory effects are thoroughly explored. Both quantized and unquantized receiver outputs are considered.
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