一种新的QAM信号信噪比估计算法  

New SNR Estimation Algorithm for QAM Signals

作　　者：韩博[1] 吴杰[1] 许华[1] 李鹏[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《电视技术》2012年第21期132-134,共3页Video Engineering

基　　金：国家自然科学基金项目(61001111)

摘　　要：针对现有QAM信号信噪比估计算法在平坦衰落信道下,估计精度不高、复杂度高、计算量大的问题,提出了一种简单、实用的新算法。该算法计算了采样信号的二阶、四阶矩,对不同阶的QAM信号建立起各自信噪比与高阶矩之间的线性关系,并利用最小二乘算法拟合出关系式中的各系数。分析了算法的复杂度,并提出了基于低复杂度下的改进算法。经仿真验证,该算法估计精度较高,实现简单,改进后的算法复杂度明显降低,性能依旧保持较好。To salve the low estimation accuracy,higher complexity, great capacity of QAM SNR estimate under the flat fading channel, a new simple and applied SNR estimation algorithm is proposed. The two-order moments and four-order moments of sampling signal are calculated, the linearity rela- tionships between the SNR of different QAM and higher moments are created, and the coefficients are solved with least squares. The complexity of the al- gorithm is calculated, and an improved algorithm is proposed under lower complexity. Simulation results show that the estimation accuracy of this algo- rithm becomes higher, the realization is simple, and the complexity of the improved algorithm is obviously lower, but the performance still keeps better.

关 键 词：信噪比估计 平坦衰落信道 统计量 数据拟合 线性关系 

分 类 号：TN911.7[电子电信—通信与信息系统]