Multiuser robust CDMA detection for underwater acoustic communication channels

Abstract

This paper proposes a receiver implementation that uses robust techniques on top of direct sequence code division to eliminate multiple access interference in an underwater acoustic environment. Computation of error probabilities and Asymptotic Relative Efficiencies with respect to other single user or multiuser detectors for various channels and contaminated heavy tailed noise distributions demonstrates that the proposed detectors maintain a nearly optimum performance regardless of the degree of noise contamination. It is also confirmed that the detector structure is insignificantly influenced by unspecified variations in noise densities. Moreover, the theory of the proposed techniques can be easily extended to multichannel processing to provide space diversity.