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天线校准误差建模及对开环波束赋形技术的影响
李亚麟,樊迅,胡波,李春亭
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(上海贝尔股份有限公司，上海 200070;复旦大学，上海 200433;空军工程大学导弹学院，陕西三原 713800)

摘要:

时分双工系统中上下行无线信道具有互易性，使得基站可以利用获得的上行信道信息实施开环波束赋形技术。但是基站天线口与基带处理模块之间的射频通道并不对称，在进行校准后由于硬件精度所限会有天线校准误差。为此，根据实测数据对天线校准误差进行建模，通过仿真得出，射频通道校准幅度误差标准差在1 dB、角度误差在20°以内时，开环波束赋形技术在误码率为10-5时性能损失小于1 dB。并由此给出了对天线校准误差的要求。

关键词: 时分双工多输入多输出开环波束赋形天线校准误差信道互易性

DOI：10.3969/j.issn.1001-893X.

基金项目:国家科技重大专项“TD LTE系统预商用设备开发”课题(2009ZX03002-001)

Modeling of Antenna Calibration Error and its Impact on Open Loop Beamforming

LI Ya-lin,FAN Xun,HU Bo,LI Chun-ting

(AlcatelLucent Shanghai Bell Co.,Ltd.，Shanghai 200070，China;Fudan University, Shanghai 200433,China;The Missile Institute, Air Force Engineering University, Sanyuan 713800, China)

Abstract:

The reciprocity between TDD (Time Division Duplex) uplink and downlink wireless channels makes it realizable to apply the uplink channel estimated result for op enloop beamforming. However, the RF（Radio Frequency）paths between antennas a nd baseband module are not symmetrical, which would degrade the perfor mance of beamforming. This paper models the antenna calibration error, and the s i mulation results show that within 1dB standard deviation of calibration amplitud e error, and 20°phase error, the performance degradation is less than 1dB at 10-5 BER(Bit Error Rate). And this conclusion gives the accuracy requi rement of antenna calibration.

Key words: time division duplex(TDD) MIMO open loop beamforming antenna calibration error channel reciprocity