Experimental evaluation of NNCLMS sparse channel estimation for shallow water acoustic communication

Abstract

Due to the sparsity that characterizes underwater acoustic (UWA) channels, in recent years interest has increased in designing of norm constraint sparse channel estimation algorithms for underwater acoustic communication. However, experimental evaluation and comparison is lacking regarding enhancing the performance of different norm constraint sparse channel estimation algorithms for UWA communication with a series of continuous experiments on a time scale of an hour. As shallow water acoustic channels pose significant difficulties such as multipath, time-space selectivity, frequency-dependent noise, and Doppler shift, this paper presents the experimental evaluation and comparison of our previously proposed non-uniform norm constraint least mean square (NNCLMS) algorithm with the classic 10-norm and 11-norm LMS algorithm in the context of a shallow water acoustic communication system. We provide and discuss experimental results obtained in shallow water channels in terms of the NNCLMS algorithm's sparse exploitation performance and the classic norm constraint type sparse algorithms.