The performance analysis of multiuser WCDMA systems using D-STBC in Rayleigh fading channel

The development of wireless communication systems is focusing to provide a link with a high capacity and good quality. The multi-hop communication system using relay´s diversity with a reliable coding is designed to fulfil the above requirements. Using multi-user WCDMA system, this research applies the above multi-hop technique using a relay with Alamouti code which can be defined as Distributed-Space Time Block Code or D-STBC. Therefore it does not need multi antenna but act like MIMO and that is why it is also called virtual MIMO using a cooperative multi-hop system. The simulation results show that the 2×1 virtual MIMO multi hop system performs better than a single hop system. Targeting BER of 10^-3, the multi hop system give 12 dB gain compared with a single hop system.