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Journal of the Korean Institute of Electromagnetic and Science 2006;6(2):83-91.
Space Time Rake Receivers for Time Division Synchronous CDMA Base Stations
Yang Xiao1, Kwang-Jae Lee2, Moon-Ho Lee3, Sam-Goo Cho4
1Institute of Information Science, Beijing Jiaotong University
2Dept. of Multimedia, Information and Telecommunication, Hanlyo University
3Dept. of Information and Communication, Chonbuk National University
4SoC Center of Korean Electronics Technology Institute
Abstract
In this paper, we develop space-time(ST) Rake receivers for Time Division Synchronous Code Division Multiple Access(TD-SCDMA) base stations(BS). The beamforming of BS transforms the uplink MIMO channel space into many sub-sectors' channels to be nearly orthogonal, thus, well established 1-D Rake technology can be used to TD-SCDMA base station to construct ST Rake, which simplified the system's implementation as well as enlarged users' capacity by the beamforming. The construction and capacity of MIMO sub-sectors by multi-beamforming have been presented. The proposed ST Rake algorithm include the multi-beamforming algorithm for MIMO sub-sectors and classical 1-D Rake algorithm. The calculating formulas for interference plus noise ratio(SINR) and bit error rate(BER) have been derived. Simulations verify that the proposed ST Rake receiver for BS is effective, and the BS systems can get higher system capacity and can be of better performance than presented TD-SCDMA systems.
Key words: Space-Time, Rake Receivers, CDMA Systems, Array Antennas, Multi-Beamforming, MIMO Sub-Sectors
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