ZF Code-Aided Narrow-Band Interference Suppression for Synchronous DS-CDMA Systems

This paper analyzes zero-forcing (ZF) code-aided narrow-band interference (NBI) rejection in synchronous direct-sequence code-division multiple access (DS-CDMA) systems of complex channel circumstance. The performance of decoding is badly affected based on general ZF code-aided techniques because of the phase of complex gain accounting for channel effects. The system based on modified ZF code-aided technique could cancellate or relieve the effects but attend by high computational complexity. So this paper designs a new optimal restrictive ZF code-aided technique to solve this problem without the increasing of computational complexity. The conclusion is approved by experiments.