Abstract: There have been no standard statistical channel models for the underwater acoustic (UWA) channel as a result of the complex and variability of UWA channel. Different UWA channel models are required for different purposes during the UWA communication research. It is important to evaluate the effect of different UWA channel modeling on research conclusions. From the perspective of channel errorcorrection code, the effects of different channel models on channel errorcorrection code (taking LDPC codes as an example) design are investigated by analyzing several UWA channel models, including timeinvariance model, timevariance model and quasistatic fading model adopted in UWA communication simulation. The simulation results show that the optimized designs of coding parameters are almost the same, although different channel modeling usually requires different signaltonoise ratio for decoding. The sea test data are adopted to further verify the conclusions.

Key words: communication technology, underwater acoustic communications, channel model, channel errorcorrection code, LDPC code