Application of quasi-orthogonal sequence in underwater acoustic DSSS communication system

This article deals with the performance of quasi-orthogonal sequence in underwater acoustic direct sequence spread spectrum communication. A code division multiple access communication system adopting quasi-orthogonal sequences as short code is considered. The capability of a quasi-orthogonal sequence in combating intersymbol interference and multiple access interference is discussed and the capacity of the system is calculated. Computer simulation showed that the quasi-orthogonal sequence is more robust in an underwater acoustic channel.