A list Viterbi equalizer with simple liner channel interpolation for acoustic communications

This paper discusses a list Viterbi equalizer (LVE) with liner channel interpolation (LCI), which can cope with time and frequency selective channels, i.e., doubly-selective channels of acoustic communications. Features of the proposed LVE are (1) to cope with delay spread over 127 bits with small computational complexity, (2) to cope with time selective channels by simple channel estimation and its LCI and (3) to cope with non-minimum phase condition by metric-criteria combining. Next, computer simulation results show that the proposed LVE has better performance on doubly-selective channels than a decision-feedback equalizer employing recursive least square (RLS) algorithm. Finally, field evaluation results confirm that the proposed LVE is suitable for acoustic communications environment.