Abstract
Pulse Position Modulation (PPM) has shown great advantages by being non-coherently implementable. However, PPM suffers from the high multipath delay in underwater acoustic channels. To be robust against the doubly spread effects in underwater acoustic communications, this project proposes a novel modulation scheme that is non-linear and that can be implemented non-coherently, called the Circular Time Shift Modulation (CTSM) based on the high auto-correlation property of Zero-Correlation-Zone (ZCZ) signals. The performance of CTSM in terms of bit error rate is investigated by emulations and at-sea experiments. The results have shown that the CTSM system has higher robustness compared with PPM in underwater acoustic communications.
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