Performance improvement of single code cyclic shift (SCCS) multiuser detector by using turbo coding and multiple antenna receive diversity over multipath fading channels for synchronous DS-CDMA systems

It is possible to increase the performance of today's and future?s important applications 3G, 4G broadband wireless communication systems and many other innovations by using multiple antenna technology that provides high spectral efficiency and data rate combined with appropriate communication methods.Nowadays, when importance of mobile communication increases more and more, to use bandwidth, which is suitable for much more user, more efficiently has become a priority issue. Another equally important issue is the safety and reliability of the communication. One of the methods used to solve these problems is Code Division Multiple Access system.In this study, bit error rate (BER) of synchronous Code Division Multiple Access systems in which Single Code Cyclic Shift (SCCS) detector method is used over multipath fading channels is analyzed by MATLAB simulation program. After that, study is extended to multiple antenna structure by using receive diversity and maximal ratio combining method and the proposed detector?s performance is compared with other detector types defined in literature. At the end, Turbo coding is added to the system architecture and the effect of this method to Single Code Cyclic Shift detector?s performance is analyzed.Key Words : Code division multiple access, Single code cyclic shift multiuser detection, Receive Diversity, Turbo coding