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In the South China Sea, an underwater acoustic communication network (UWACN) is now in the experimental phase. The aim of UWACN project is to build a shallow water network which includes more than 10 nodes and continuously collects ocean observation real-time data with duration larger than one month. The design and implementation of robust and low power modem for the underwater network is considered...
In downlink relay systems, the conventional straightforward relaying scheme named decode-and-forward (DF) protocol is used at relay station (RS) to decode the data received from base station (BS) and forward the decoded data to the mobile station (MS) to improve the spatial diversity gain. However, conventional DF mode is spectral inefficient and not capacity optimal since the wireless channels in...
In this paper, a new type-II hybrid ARQ (HARQ) scheme based on TCM and concatenated codes is proposed and evaluated. The new scheme is divided into two major steps which are BCH processing and turbo processing. Firstly, information bits are transmitted using TCM and then the incremental parity bits based on BCH codes are transmitted upon the reception of NAK. Secondly, the incremental redundancy (IR)...
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