Application of cyclic delay transmit diversity to uplink 2-dimensional block spread CDMA with frequency-domain equalization
Application of cyclic delay transmit diversity to uplink 2-dimensional block spread CDMA with frequency-domain equalization
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DOI：
10.1109/pimrc.2009.5449845
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Qiyue Yu;W. Meng;Bo Liu;F. Adachi
中科院分区：
文献类型：
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作者：
Qiyue Yu;W. Meng;Bo Liu;F. Adachi
多址干扰（MAI）的存在限制了码分多址（CDMA）的上行链路性能。2-二维（2D）块扩展CDMA使得可以实现无MAI的上行链路传输，同时通过使用低复杂度的单用户频域均衡（FDE）来获得频率分集增益。为了进一步提高上行链路传输性能，可以使用发射分集技术。循环延迟发射分集（CDTD）可以增强信道的频率选择性。本文将CDTD应用于二维块扩频CDMA系统中，并采用MMSE-FDE技术。通过计算机仿真，对直接序列CDMA和多载波CDMA的上行链路误码性能进行了评估。结果表明，在频率选择性上行链路信道中，CDTD可以提供改善的上行链路BER性能。
The presence of the multi-access interference (MAI) limits the uplink performance of code division multiple access (CDMA). 2-dimensional (2D) block spread CDMA makes it possible to achieve MAI free uplink transmission while obtaining the frequency diversity gain by using low-complexity single-user frequency-domain equalization (FDE). To further improve the uplink transmission performance, the transmit diversity technique can be used. Cyclic delay transmit diversity (CDTD) can strengthen the frequency-selectivity of the channel. In this paper, we apply CDTD to 2D block spread CDMA with MMSE-FDE. The achievable uplink BER performance is evaluated by computer simulation for both direct sequence CDMA and multi-carrier CDMA. It is shown that CDTD can offer improved uplink BER performance in a frequency-selective uplink channel.