Improved scheme with cooperative diversity based on distributed space-time block coding |
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Authors: | Du Na Xu Dazhuan |
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Affiliation: | Coll. of Information Science & Technology, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P. R. China |
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Abstract: | 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 space-time 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. |
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Keywords: | multiple input multiple output cooperative diversity distributed space-time block coding multi-carrier CDMA |
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