Transmit Diversity Schemes for MUD based CDMA TDD Systems

초록

In CDMA TDD wireless systems, the major requirement for data detection is the cancellation of both MAI as well as ISI. Multiuer detection (MUD) technique is one of the joint detection techniques that satisfy this requirement with its complexity low enough to support the real-time processing and feasible for the practical implementation. The performance requirements can be satisfied even with the lower transmission power by improving the transmission media. Transmit diversity is the antenna diversity technique that provides more efficient use of the spectrum and hence improve the transmission performance without the significant complexity increase at the receiver. This paper reviews the multiuser detection algorithm that can be applied to any TD-CDMA systems, and introduces the various transmit diversity schemes that are applicable to this MUD-based receivers. The performance gains and the complexity evaluations are provided for each transmit diversity scheme associated to a specific physical channel.

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