| On the basis of studying physical layer standard of TD-SCDMA, the use of smart antenna in TD-SCDMA is studied systemically and profoundly in this thesis. Firstly, the TD-SCDMA system and smart antenna technology are presented systemically. Secondly, taking uniform linear array as a model, the analysis and simulation of subspace-based MUSIC algorithm is carried on and the algorithm is extended to uniform circular array and is advanced to reduce the computation. And then it focuses on the non-blind adaptive beam-forming algorithm, mainly theoretically analyses the performance and computational complexity of LMS algorithm and RLS algorithm and achieves these algorithms in program; making full use of TD-SCDMA characteristic, two improved LMS algorithms are introduced and simulation results indicate the effectiveness of the improved algorithms. Finally, a simulation platform for smart antenna is set up and by comparing the performance of TD-SCDMA with smart antenna with the performance of TD-SCDMA without smart antenna, the simulation results show that adopting smart antenna in TD-SCDMA can effectively improve receiving quality, lower BER and enlarge system capacity. |
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