Method of selecting signals with spatial-temporal diversity for underwater communication using OFDM technique

Abstract

In this paper, we propose a reliable communication solution using space-time diversity technique but using only one transceiver antenna applied to mobile OFDM system in underwater communication environment. In our solution, instead of using multiple receive antennas, the transmitter transmits an OFDM signal N times consecutively. The moving transmitter during sending OFDM frames will creat both spatial and temporal diversity of the received signal. To decode the signal from N received OFDM signal frames, we propose an optimal frame selection method to increase efficiency as well as save decoding time. The simulation and experimental results show that the system can achieve a better SER error rate than the MRC technique applied to N received data frames and the number of calculations in our algorithm is also less than that of combination maximum cases of N frames.