Abstract:

An improved scheme with cooperative diversity based on distributed space-time block coding (WCDDSTBC) is proposed, which effectively achieves diversity gains and improves the performance of the system by sharing some single-antenna users’ antennas to form a virtual antenna array and combining with distributed spacetime block coding (DSTBC) mode. Then the relation between the system BER and the interuser BER for WCDDSTBC scheme is theoretically derived and the closed-form expression of BER forWCD-DSTBC system is obtained. The simulation results show that the proposedWCD-DSTBC scheme achieves distinct gains over the non-cooperative multi-carrier CDMA (MC-CDMA) system. When system BER is 1e−3 and interuser BER is 1e−3, about 2.5 dB gain can be gotten. When interuser channel state information (CSI) outgoes the users’ individual CSI, about 3 dB gain is also achieved.