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TD-LTE系统中动态下行波束赋形算法性能分析
曹伟,樊迅,郭彬,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:

根据加权粒度的差别，介绍了per-RB-MRT算法和full-BW-EBB算法的原理，并对这两种算法的特点以及性能差异进行了理论分析。构建了符合3GPP规范定义的TD-LTE系统上下行仿真平台，对这两种算法在有信道估计误差（包括信道估计精准度和信道信息时延）的情况下的其性能进行了理论分析和仿真研究。仿真结果表明，per-RB-MRT算法在上行信道估计值和下行信道实际值契合较好的情况下能够趋于最佳理论性能，而full-BW-EBB算法由于利用了相对稳定的信道空间相关特性，因而能够在较差的信道环境中保持较高的性能鲁棒性。这些仿真结果对于实际场景中的算法选择提供了重要的参考依据。

关键词: 多入多出 TD-LTE 波束赋形算法接收性能

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)

Performance Analysis of Downlink Beamforming Algorithms in TD-LTE System

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

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

Abstract:

Principles of two beamforming algorithms, i.e., per-RB-MRT and full-BW-EB B,are introduced. To provide performance reference for practical ap plications, a complete uplinkdownlink simulation platform is built according t o 3GPP-LTE specifications. The performance of two algorithms under imperfect chan nel estimation and channel information delay is studied. It is shown that perfor mance of the per-RB-MRT algorithm approaches the optimal theoretical benchmark w hen the uplink channel estimation is accurate and uplink/downlink channel matche s well. The full-BW-EBB algorithm, on the other side, provides robust performanc e under imperfect channel estimation and uplink/downlink mismatch. The theoretic al discussion and simulation results provide valuable reference for algorithm de sign in TD-LTE systems.

Key words: MIMO TD-LTE beamforming algorithm receiving performance