A new scheme for signal reception in MC-CDMA systems with space-time block coding

In this paper, we investigate signal reception in multi carrier code-division multiple-access (MC-CDMA) systems. Since transmit diversity is an effective technique to improve the performance of wireless communication systems, the space-time block code (STBC) is applied to multicarrier-CDMA systems. A new scheme is proposed to determine a weight vector which combines the desired signal contributions from different carriers while suppressing noise and interference and can decode space-time block code perfectly. Simulation results show, the performance of this scheme is comparable with minimum mean square error combiner (MMSEC) and unlike the later, no knowledge of noise is required.