一种移动环境下的信噪比估计算法及其在多普勒频移估计中的应用  

SNR estimation scheme and its application in Doppler shift estimation in mobile communication systems

作　　者：华惊宇[1] 黄清[1] 滑翰[1] 尤肖虎[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2005年第5期132-137,共6页Journal on Communications

基　　金：国家"863"基金资助项目(2001AA123015;2003AA123310);国家NSFC重大基础课题基金资助项目(60496311)

摘　　要：利用移动信道的功率谱特性,提出了一种基于谱分析的平均信噪比估计算法,其实现可以利用FFT(fastfouriertransform),从而有效节省了运算资源。其次结合噪声环境下多普勒频移的理论偏差,提出了基于信噪比估计的改进方法。计算机仿真表明,在一般通信系统的工作信噪比范围,文章的信噪比估计方法具有较高的估计精度,而且基于信噪比估计的改进多普勒频移估计方法在各种移动速度和信噪比下都表现出较高的估计精度。An average SNR estimation method based on mobile channel power spectrum analysis was proposed here. It could be implemented with FFT to reduce operations effectively. In addition, an improved estimation method base on SNR estimation was proposed according to the theoretical bias of Doppler shift estimator. We verified the proposed algorithms by Monte Carlo computer simulation, the accurate results of the SNR estimator is found in the working SNR range for most communication system, and the high estimation accuracy in wide ranges of velocities and SNRs is observed from the results of the improved Doppler shift estimator.

关 键 词：信噪比 电平通过率 多普勒频移 

分 类 号：TN929.533[电子电信—通信与信息系统]