A simulation study of cooperative underwater acoustic communication
Type : Master's thesis
Publication Status : unpublished
Access : restrictedAccess
Cooperative communication promises significant performance gains in terms of link reliability, spectral efficiency, system capacity, and transmission range. Due to its indisputable advantages for high-speed underwater applications with size and power limitations, cooperative transmission is a promising physical layer solution for next generation underwater acoustic (UWA) communication systems. Although a rich literature already exists on cooperative communication for terrestrial wireless radio frequency (RF) systems, there are only sporadic results reported for UWA applications. In this thesis, we consider cooperative UWA communication and investigate the performance of relay selection in underwater for multi-carrier and single-carrier systems with various selection criteria. In the first part, we consider a multi-carrier multi-relay cooperative UWA communication system based on orthogonal frequency division multiplexing (OFDM) and investigate both amplify-and-forward (AaF) and decode-and-forward (DaF) relaying in half-duplex mode. We adopt different relay selection criteria which rely either on the maximization of signal-to-noise ratio (SNR), the minimization of probability of error (PoE), or the maximization of capacity for relay selection. These are utilized in conjunction with diverse approaches such as per-subcarrier, all-subcarriers, or subcarrier grouping. We provide an extensive Monte Carlo simulation study to evaluate the error rate performance of relay selection schemes. In the second part of the research, in order to increase spectral efficiency, we consider OFDM-based multi-relay systems with two-way relaying and study the performance of relay selection in UWA channels. In the final part of the thesis, we consider single-carrier frequency-domain equalization (SC-FDE) and present the performance of relay assisted SC-FDE schemes providing comparisons with uncoded OFDM counterparts.
Date : 2012-08
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