| 应用定向天线测量无线信道角度功率谱 |
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| 引用本文： | 李纪,张尔扬.应用定向天线测量无线信道角度功率谱[J].电波科学学报,2007,22(1):59-63. |
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| 作者姓名： | 李纪 张尔扬 |
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| 作者单位： | 国防科技大学电子科学与工程学院,湖南,长沙,410073;总参通信工程设计研究院,辽宁,沈阳,110005;国防科技大学电子科学与工程学院,湖南,长沙,410073 |
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| 摘 要： | 针对无线信道角度功率谱测量问题,提出了一种简单而新颖的测量方法.利用定向天线进行方位角扫描的功率测量,观测值、天线方向图和角度功率谱之间构成第一类Fredholm积分方程,通过求解积分方程可以得到角度功率谱.利用低通滤波器对观测数据进行预处理可以克服解积分方程的病态问题,改变滤波器参数并结合最小均方误差准则,可以得到角度功率谱的最小均方误差估计.仿真结果验证了该方法的有效性.
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| 关 键 词： | 无线信道 角度功率谱 定向天线 解卷积 |
| 文章编号： | 1005-0388（2007）01-0059-05 |
| 收稿时间： | 2005-07-24 |
| 修稿时间： | 2005年7月24日 |
Estimation of power azimuth spectrum for wireless channel using directional antenna measurements |
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| LI Ji,ZHANG Er-yang.Estimation of power azimuth spectrum for wireless channel using directional antenna measurements[J].Chinese Journal of Radio Science,2007,22(1):59-63. |
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| Authors: | LI Ji ZHANG Er-yang |
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| Affiliation: | 1. College of Electronic Science and Engineering, National University of Defense Technology, Changsha Hunan 410073, China; 2. Institute of Communication Engineering Design of General Stuff, Shenyang Liaoning 110005, China |
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| Abstract: | A novel method for estimating power azimuth spectrum(PAS)of wireless channel is presented in this paper.Based on azimuth-scanning power measurements by using directional antenna,a Fredholm integral equation of the first kind can be constructed from the mesurmed data,the antenna pattern and the PAS.The estimations of PAS can be achieved by solving the integral equation.The ill-conditioned problems can be overcome by pre-processing the observed data by employing a lowpass filter.The minimum mean square error(MMSE)estimation of PAS can be achieved by selecting the proper parameters of the lowpass filter based on the MMSE criterion.Simulation results show that the method presented is effective. |
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| Keywords: | wireless channel power azimuth spectrum directional antenna deconvolution |
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