Novel Analytical Performance Bounds for Symbol-by-Symbol Decoding of Digital-Data Impaired by ISI an - Information Theory, IEEE Transactions on

New analytical upper bounds are derived for the performance of symbol-by-symbol maximum-likelihood (ML) Abend– Fritchman-type detectors for multi-amplitude/phase-modulated digital sequences transmitted over time-dispersive (generally) time-variant linear channels introducing finite Intersymbol Interference (ISI) and additive white Gaussian noise (AWGN). The proposed bounds are obtained starting from a novel form of the standard Bhattacharyya bound and take explicitly into account the allowed decoding delay. Both deterministic and random multipath slow-fading Rayleigh transmission ISI channels are considered. Simulation results obtained for some test channels of practical interest show the tightness of the derived analytical bounds.