Abstract
An ASK digital underwater acoustic communications system has been designed and tested to investigate the influence of error correcting codes on the performance of the system. The underwater communications channel is a multi-path fading channel and has been modelled accordingly, and the error probability was estimated under varying operating conditions. This paper describes the experimental investigations which confirm the presence of certain error probability levels. An improvement in the system performance when using error correcting coding techniques has been achieved. The ASK modulation scheme has been used in the system for ease of implementation. The tests were carried out in an outdoor swimming pool to simulate short range channels with severe multi-path effects.
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