performance analysis of multiple pn-sequences spread spectrum communication schemes in sparse underwater acoustic channels
Direct Sequence Spread Spectrum (DSSS) techniques are widely used due not only to their inherent interference rejection and multiple access capability, but also to their relative immunity from multipath effects, which are encountered in UWA channels. In code division multiple access (CDMA) technology signals from different users are distinguished by means of pseudo noise (PN) codes that are used for spreading the user messages. To overcome the severe impact of ISI in the point to point UWA communications, we propose a novel multiple pseudo noise (PN) sequences DSSS scheme and analyze its performance in sparse underwater acoustic channels. To further alleviate the ISI effect, we propose a simple ISI reduction algorithm.
performance analysis sparse channels underwater communications dsss technique