Sequential detection CDMA multiuser receiver

This paper proposes c1 sequential detection multi-user receiver which is constructed over a CDMA system such that a transmitter transmits a symbol made bv spreading the spectmm with an enveloped sequence prorected by guard sequences, and a receiver de-modulates the core-sequence part of the received symbol with a de-correlating detector or an MMSE detector and has an advantage of increasing the number of the active users. This sequential detection uses such a method that the best user signal is estimated out of the soft outputs, which are obtained by solving a de-correlating system of equations, and then detected, followed by removing the detected user component from the received symbol. All the user signals may be sequentially detected by repeating the method stated above. The computer simulution reveals a remarkable improvement in bit error rate performance compared to conventional systems.