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The characteristics of underwater acoustic channel is strong multipath, severe Doppler and limited bandwidth. OFDM modulation has good ability in anti multipath and Turbo Product Codes(TPC) has excellent performance in a high code rate, We make full use of their advantages and designed an OFDM underwater acoustic communication system based on TPC. Using the BELLHOP simulation model to get the approximate...
We propose a cognitive cooperative scheme based on cognitive relays in the downlink of a time division multiple access (TDMA) system. Cognitive relays utilize the spectrum holes detected via the spectrum detection to relay information, which can share the downlink slots through the frequency-division orthogonal transmission. Therefore, no extra system resources (slots or channels) are allocated for...
Some recent studies have focused on the performance of multi-antenna relay systems assuming that perfect channel state information at the transmitter(CSIT) or no CSIT of relay-destination link are available. However, there is still a lack of research on the performance of fixed relay networks with finite feedbacks. In this paper, we present the closed-form expression of outage probability for decode-and-forward...
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