Capacity analysis of m-user self-encoded multiple access system in AWGN channels

Self-encoded spread spectrum eliminates the need for traditional transmit and receive PN code generators. The enhanced transmission security arises from the stochastic nature of the unique spectrum spreading and de-spreading processes. In a self-encoded multiple access (SEMA) system, the number of users is not limited by the number of available sequences, unlike CDMA systems that employ PN codes such as m-, Gold or Kassami sequences. It is important from a design standpoint to specify the minimum number of chips to support multiple users for a specified quality of service and capacity in SEMA system. We find the number of chips for an m-user SEMA system to achieve the specified capacity and bit error rate. The capacity analysis provides a useful indication of the maximum number of users for a given spreading factor