On Performance Improvement of Asynchronous CDMA Systems Through the Use of Orthogonal Sequence Spreading

摘要

In conventional CDMA systems that utilize the direct sequence spread spectrum(DSSS)technique,signals are spread bit by bit using the PN sequences.The performance of these systems is generally poor due to high interferences from other users.To reduce the effects of thcse interferences.a method can be used that spreads signals symbol by symbol using the binary orthogonal sequences.In this paper,we show that the system performance can be greatly improved by using such a technique.