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. |
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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) |
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Modeling of Antenna Calibration Error and its Impact on Open Loop Beamforming |
LI Ya-lin,FAN Xun,HU Bo,LI Chun-ting |
(AlcatelLucent 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
enloop beamforming. However, the RF(Radio Frequency)paths between antennas a
nd baseband 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 |