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八天线TD-LTE系统的波束赋形算法分析
郭彬,樊迅,曹伟,李亚麟,蒋智宁
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(上海贝尔股份有限公司，上海 201206)

摘要:

多天线是天线技术的发展趋势，TD-LTE引入了8发2收的天线配置。基于小间距多天线阵列,利用TDD系统信道互易性，波束赋形技术可以根据上行导频获得信道信息，形成对基带（中频）信号的最佳组合或者分配，补偿无线传播过程中由空间损耗、多径效应等因素引入的信号衰落与失真，同时降低同信道用户间的干扰。EBB(Eigenbased Beamforming)算法是波束赋形主要算法之一，该算法中在整个波束空间中，找到使接收信号功率最大的赋形权矢量。通过仿真，对EBB算法在各种应用场景下的性能进行了分析，结果表明八天线E BB波束赋形算法可以正确实现波束合成，在低速或上行信道信息估计误差较小情况下能够明显提高系统性能。

关键词: TD-LTE 波束赋形特征值分解 EBB SCM-E

DOI：10.3969/j.issn.1001-893X.

基金项目:国家科技重大专项资助项目(2009ZX03002-001)

8 Antennas Eigen based Single Stream Beamforming Algorithm for TD LTE System

GUO Bin,FAN Xun,CAO Wei,LI Ya-lin,JIANG Zhi-ning

(AlcatelLucent Shanghai Bell Co., Ltd., Shanghai 201206，China)

Abstract:

Multiantenna technology is the mobile telecommunication trend and an 8×2 antenna configuration is introduced in TDLTE recently. Based on small distanc e multiantenna arrays, in such a system, by utilizing the TDDsystemspecific ch annel reciprocity characteristic, the beamforming gets channel information form uplink signals, then forms the best combination or distribution of base-band (IF ) signal, compensates signals fading and distortion caused by facto rs such as space loss or multipath effects in wireless communication process, w hile reducing cochannel interference between users. EBB (Eigenbased Beamform in g) algorithm is one of the main algorithms for beamforming. EBB algorithm finds the weight vector in the whole beam space, which makes the receiving signal powe r biggest. Through simulation, the EBB algorithm performance under various appli cation scenarios is analysed. The results show that the 8 antennas EBB algorithm can correctly achieve beam synthesis and significantly improve the system g ain under the cases with low speed and small channel estimation error.

Key words: TD LTE beamforming eigen value decomposition(EVD) eigen-based beamforming SCM-E