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In consideration of the harsh environment of underwater acoustic channel and the high reliability transmission requirement, a carrier interleaved underwater acoustic MC-CDMA communication system using complete complementary sequence (MIC-CDMA/CCS) is proposed in this paper. We use OFDM modulation to reduce the complexity of the system, obtain the diversity gain by frequency domain spread spectrum,...
Underwater acoustic channel is a time varying, strong multipath, serious Doppler frequency shift, and high noise interference channel. Aiming at the requirements of strong stability and high reliability to support reliable transmission over long distance, a direct sequence spread spectrum based on single carrier underwater acoustic communication system using dual spread spectrum code (SC-CDMA/DSSC)...
Aiming at the requirement of Doppler and channel estimation which applied to underwater mobile communication with orthogonal frequency division multiplexing (OFDM) technology, a PN sequence based method for Doppler and channel estimation is proposed, an underwater acoustic OFDM communication system structure is given and a block data frame based on PN sequence is designed. For the Doppler estimation...
Energy efficient wireless communications have recently received much attention, due to the ever-increasing energy consumption of wireless communication systems. In this paper, we propose a new energy-efficient cooperative relaying scheme that selects a subset of relays before data transmission, through proactive participation of available relays using their local timers. We perform theoretical analysis...
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