Iterative equalization and decoding techniques for shallow water acoustic channels

We investigate the application of iterative equalization and decoding techniques to the shallow water acoustic channel. The first receiver is a joint decision feedback equalizer (DFE) and turbo decoder. The second receiver is a turbo equalizer, which jointly estimates the channel, performs MAP equalization, and decodes received symbols. Although the MAP equalizer is optimum for a known channel, channel estimation errors degrade the performance of the turbo equalizer. We compared the performance of both receivers under real channel conditions.