| 摘要: |
| 对于分布式天线系统，虽然传统迫零接收算法能够通过信道估计获得无线信道状态信息，从而取得分集增益，但对于相干信道，迫零方法因为无法准确估计信道而不再适用。为此，提出一种新方法，针对相干信道，利用功率倒置准则，并使用最小均方自适应滤波算法校正各个接收通道信号的相位差完成信号合成，最终获得阵列增益。该方法无需信道状态信息或者信号波达方向等先验信息，实现简单。计算机仿真证明了算法的有效性。 |
| 关键词: 分布式天线阵 信号合成 功率倒置 自适应滤波 |
| DOI： |
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| 基金项目:中央高校基金(2018CDGFTX0014)；“十三五”国防预研基金(305010905) |
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| Signal Combination of Distributed Antenna Array Using Power Inversion Criteria |
| LI Xiaoqing,LI Pengjie,LIU Xin,HE Zhanquan,LI Chuang |
| (1.Space Star Technology Co.,Ltd.,Beijing 100095,China;2.School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400044,China) |
| Abstract: |
| In distributed antenna system,the traditional zero-forcing receiving algorithm acquires wireless channel state information through channel estimation,so that diversity gain is obtained.But zero-forcing algorithm can not work because accurate channel estimation is not available in the case of coherent channels.With the proposed method,the phase difference between signals received by antenna elements can be corrected in coherent channels using power inversion criteria and least mean square(LMS) adaptive filtering algorithm.The proposed method is easier to be implemented without extra information of channel state or directions of arrival（DOA）of the signals.The computer simulation proves the effectiveness of this algorithm. |
| Key words: distributed antenna array signal combination power inversion adaptive filtering |
