Underwater acoustic communications using quasi-orthogonal chirps

摘要

We propose a quasi-orthogonal chirp waveform design technique for underwater acoustic communications and study the correlation performance of binary linear chirp waveforms under different bandwidth and time constraints. Specifically, we consider binary information symbols that are carried over optimized binary linear chirp waveforms and transmitted over an underwater acoustic multipath channel. We present receiver design considerations and derive a closed-form expression for the cross-correlation coefficient of binary linear chirp waveforms. The bit-error-rate (BER) performance of the proposed quasi-orthogonal chirp waveforms is evaluated through both simulations and experiments with in-house built software-defined underwater acoustic modems.