Adaptive equalization techniques for interference suppression in shallow water acoustic telemetry channels

Abstract

Despite the severe propagation conditions in shallow water acoustic telemetry channels, coherent high speed data transmission may be established using adaptive receivers based on a decision feedback equalizer (DFE) structure. The performance of a DFE in shallow water acoustic networks is affected by substantial cochannel interference from acoustic modems, in addition to extended, time-varying ISI and large Doppler fluctuations. In this paper we address the interference suppression ability of a DFE by evaluating a channel-specific structure for reliable interference suppression and dynamic channel tracking. The DFE performance is compared to adaptive multiuser receiver which jointly performs adaptive equalization and multiple-access interference cancellation.<>