Blind and Semi-Blind Decoder Metrics for Turbo-Coded Frequency-Hopped Spread-Spectrum in Partial-Band Interference and Fading Channels

Authors:
Ahmad Gomaa;Ayman Elezabi
Affiliations:
Electronics and Communications Department, Cairo University, Cairo, Egypt;Electronics Engineering Department, American University in Cairo, Cairo, Egypt
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

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Abstract

We consider turbo-coded frequency-hopped systems operating in partial-band interference and fading channels under conditions which make Signal-to-Noise Ratio (SNR) estimation difficult or infeasible. For Non-Coherent Binary Frequency Shift Keying (NCBFSK) we propose blind decoder metrics that offer significant performance gains over the conventional self-normalized metric originally proposed for non-fading channels and uncoded communications. We also propose several blind heuristic metrics for phase-compensated Binary Phase Shift Keying (BPSK) systems of varying complexity and performance. For both NCBFSK and CBPSK we then derive the exact conditional LLR given the second---order averages of the interference and noise, which we refer to as semi-blind metrics. Impressive performance gains are realized in both cases. For BPSK the best totally blind heuristic metric nearly achieves the performance of the exact conditional LLR and has the advantage of not requiring any statistics on interference or noise. In all cases the performance gains are most pronounced for small values of the interference duty factor.