STTC based site diversity technique for MC-CDMA system

Multi-carrier code division multiple access (MC-CDMA) systems achieves high data rates in wireless communication. Nevertheless, when transmitting over fading channel, multi-cell interference occurs which degrades the performance of the system. Site diversity technique is applied to the system to overcome multi-cell interference. However, multi-cell interference has not been completely eradicated as spreading codes assigned are non orthogonal and hence, spreading codes are assigned to each base station. Space time block codes (STBC) was introduced to reduce multi-cell interference. Space time trellis codes (STTC) provide coding gain in addition to diversity gain of STBC. In this paper space time block code (STBC) site diversity with multiple input multiple output (MIMO) technique is proposed to improve the performance of MC-CDMA systems and is extended to STTC site diversity. Simulation results prove that STTC outperforms STBC site diversity.