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Research of Adaptive Algorithm for Smart Antenna in TD-SCDMA System

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Tutor: XuDingJie
School: Harbin Engineering University
Course: Detection Technology and Automation
Keywords: TD-SCDMA,Smart antenna,Despreading re- expansion,Block affine projection,Constan
CLC: TN821.91
Type: Master's thesis
Year:  2009
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Abstract:
As a hot research topic in the field of wireless communications technology, smart antenna technology has been successfully applied to the TD-SCDMA communication system, and will play an important role in the future mobile communication systems. Adaptive beamforming smart antenna technology, it can adaptively controlled antenna array pattern in the direction of the user signals to produce a narrow beam of high-gain, deep nulls in the direction of the interfering signals, is to achieve the best reception of the user signals an effective way. This paper first introduces the basic theory of the smart antenna, smart antenna beam forming technology in the non-blind adaptive algorithms (LMS, RLS) and blind adaptive algorithm (SG-CMA, LS-CMA) were analyzed. Second on the the under GBSBEM vector channel model used in this paper, TD-SCDMA system wireless multipath propagation channel environment model. Papers focus on the constant modulus algorithm despreading weight expansion technology to expand research and analysis in the TD-SCDMA system blind adaptive beam forming algorithms analysis least squares despread re-expansion of the multi-objective (LS-DRMTA) algorithm, and Least Squares despreading re-expansion of multi-target based on the constant modulus algorithm (LS-DRMTCMA) proposed two improved algorithms, block-based recursive least squares despread re-expansion of multi-target constant modulus algorithm (Block RLS-DRMTCMA ) affine projection solution based on block expansion of re-expansion of multi-target constant modulus algorithm (Block AP-DRMTCMA), and details of the derivation of the algorithm. Block RLS-DRMTCMA use of the information carried by the previous data bits can achieve better performance in a non-time-varying channel environment; Block AP-DRMTCMA despreading re-expansion of the technology and the constant modulus algorithm to generate a reference signal, and then the use of block imitation overhead projector (Block APA) algorithm generates weight vector in static multi-user multi-path channel and dynamic channel conditions are able to achieve excellent performance. The simulation results show that the improved algorithm in multi-user multi-path channel environment beamforming accuracy of the output signal-to-noise ratio, bit error rate showed more excellent performance and dynamic tracking performance in dynamic channel environment also has been raised. Improved algorithm-based beam forming technology for TD-SCDMA system can effectively reduce or even eliminate the system of multi-user interference, multipath interference, improve system BER performance and expand the system capacity and, therefore, this study not only has theoretical significance , but also has a great practical value.
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