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TDD系统中非完美信道信息条件下双流波束赋形吞吐量分析
张雷,蒋智宁,胡波,李春亭
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(上海贝尔股份有限公司，上海 201206;复旦大学电子工程系，上海 200433)

摘要:

在时分双工多天线系统中，由于上行信道估计误差和上下行传输时延，上下行链路信道的互易性并不完美；且终端也存在信道估计误差。针对包含这些因素的非完美信道信息条件下的双流波束赋形，导出了吞吐量准确值及其下界的表达式。分析表明，当下行链路信噪比趋于无穷大时，由终端信道估计误差导致的每一路数据流的吞吐量损失几乎不超过lb 3 bit/s·Hz-1。数值和仿真结果表明，所得吞吐量下界与准确值较为接近；且与完美信道信息情形相比，非完美信道信息对系统的复用增益没有影响，只会降低系统的阵列增益。

关键词: 多入多出时分双工双流波束赋形非完美信道信息吞吐量分析

DOI：

基金项目:国家科技重大专项资助项目(2010ZX03002-003)

Throughput Analysis of Dual stream Beamforming in TDD Systems with Imperfect Channel State Information

ZHANG Lei,JIANG Zhi-ning,HU Bo,LI Chun-ting

(AlcatelLucent Shanghai Bell Co., Ltd., Shanghai 201206,China; Department of Electronic Engineering,Fudan University,Shanghai 200433,China)

Abstract:

In a Time Division Duplex(TDD) multiple antenna system, the channel r eciprocity between uplink and downlink is imperfect due to the uplink channel es timation error and the transmission delay. Besides, the channel estimation error exists at the terminal. In this paper,the dualstream beamforming t echnique is investigated with imperfect Channel State Information(CSI) as descri bed above, and a throughput expression and its Lower Bound(LB) are derived. Analysis shows tha t the t hroughput loss of each stream due to the channel estimation error at the termina l will be almost not more than lb 3 bit/s·Hz-1 if the downlink Signalto Noise Ratio(SNR) is infinite. The numerical and simulation results demonstrate that the d erived th roughput LB is close to its theoretic value. The imperfect CSI only degrades the array gain while not impacting the multiplexing gain.

Key words: multiple input mu ltiple output(MIMO) time division duplex(TDD) dual-stream beamforming imperfect channel state information throughput analys is