TD-SCDMA系统改进的波束形成算法研究
首发时间:2011-06-02
摘要:TD-SCDMA系统中同信道不同用户的信号干扰是影响系统性能的主要因素之一,这就需要运用各种算法来提高系统的抗干扰能力。本文讨论的是一种适用于TD-SCDMA系统的改进的最小二乘解扩重扩多目标恒模阵列 (LS_DRMTCMA) 智能天线自适应波束形成算法,该算法是将Z.Rong等提出的盲算法LS_DRMTCMA的参考信号应用到RLS算法当中,利用RLS算法调整权值,最后使权值达到最佳。仿真结果表明,改进的LS_DRMTCMA算法与LS_DRMTCMA算法相比,提高了系统的抗干扰能力并有较好的波束指向性,而且改进的LS_DRMTCMA算法分辨空间信号的能力和跟踪用户信号的能力都比较强,从而达到抑制其他用户信号干扰的目的。
关键词: TD-SCDMA系统 最小二乘解扩重扩多目标恒模阵列算法 智能天线 RLS算法 自适应波束形成
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Improved Beam-forming Algorithm Used in TD-SCDMA System
Abstract:Interference come from different users in the same channel is a main factor that infects the system performance. So it is important to use some algorithms to improve anti-interference capability of the system. The paper introduces a improved adaptive beam-forming algorithm which applies to smart antenna developed for TD-SCDMA system by using least-squares de-spread re-spread multi-target constant modulus adaptive array algorithm. The core of this algorithm is to apply the referenced signal in blind LS_DRMTCM adaptive array proposed by Z.Rong to RLS algorithm in order to get the most ideal performance by adjusting coefficient values. It is indicated that compared with LS_DRMTCM adaptive array algorithm, the improved algorithm not only enhances anti-interference ability and good directional beam of system, but also makes system much stronger in distinguishing space signal and tracking users in order to achieve the purpose that inhibit interference of other users.
Keywords: TD-SCDMA system LS_DRMTCM adaptive array algorithm smart antenna RLS algorithm adaptive beam-forming
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