Reducing the overhead of OFDM communications over underwater acoustic channels

Zhiqiang Liu, T. C. Yang
2012 Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems - WUWNet '12  
In this paper, we propose a receiver design for single-input multiple-output (SIMO) orthogonal frequency division multiplexing (OFDM) communications over underwater acoustic (UWA) channels. The proposed design consists of two key components: i) time reversal based symbol detection that enables the use of short guard time intervals for interblock interference avoidance; and ii) decision-directed channel tracking with error propagation control that eliminates the need of periodic training for
more » ... ic training for channel tracking. The goal of our design is to improve bandwidth efficiency by reducing the amount of overhead typically associated with SIMO-OFDM UWA communications. The proposed design is tested at a sea-going experiment. The experimental results confirm the merits of our design and demonstrate considerable improvements over a competing alternative.
doi:10.1145/2398936.2398951 dblp:conf/wuwnet/LiuY12 fatcat:iwvbwwyvsjgybnebaxwftjrjne