Signature Sequences for CDMA Communications

Abstract Code‐division multiple accessis a method allowing several users to share a common physical channel. Different users use differentsignature sequencesfor their messages. The signature sequences and the channel determine theinterferencebetween different users in the receiver and the performance of the synchronization method used, and thus the signature sequences represent an important part of the multiple access method. In this article, an overview of code‐division multiple access is presented and properties of signature sequences are discussed. Some common classes of signature sequences are described and their properties are summarized. Some remarks on the difficulty in designing signature sequences are also given at the end.