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An improved scheme with cooperative diversity based on distributed space-time block coding(WCD-DSTBC) 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 WCD-DSTBC scheme is theoretically derived and the closed-form expression of BER for WCD-DSTBC system is obtained. The simulation results show that the proposed WCD-DSTBC scheme achieves distinct gains over the non-cooperative multi-carrier CDMA(MC-CDMA)system.When system BER is le-3 and interuser BER is le-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.
An improved scheme with cooperative diversity based on distributed space-time block coding (WCD-DSTBC) is available, which effectively achieves the 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. The relationship between the system BER and the interuser BER for WCD-DSTBC scheme is theoretically derived and the closed-form expression of BER for WCD-DSTBC system is obtained. The simulation results show that the proposed WCD-DSTBC scheme achieves distinct gains over the non-cooperative multi-carrier CDMA (MC-CDMA) system. System BER is le-3 and interuser BER is le-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.