一种改进的OFDM系统中信噪比估计算法

信噪比是通信信号的关键参数,它是通信质量的衡量指标之一,在无线通信及有线通信的许多场合,如功率控制、自适应调制切换等,都需要知道信噪比的数值,以获得最佳的性能。本文首先分析了几种典型的SNR估计算法,并根据有线信道特点,在信道估计差量SNR估计方法的基础上,提出改进措施。仿真结果表明,改进算法有效的提高了估计精度,适用于有线信道的OFDM系统。

An Improved SNR Estimation Algorithm in OFDM

SNR（ Signal to Noise Ratio） is a typical parameter of communication,and it is one of measure standard of communication quality. We need know the value of SNR to get better performance in many occasions of communication,like power control and adap- tive modulation. In this article,several typical SNR estimation algorithms are analyzed,and according to the characteristics of cable channel,an improved algorithm is put forward based on the channel differentia SNR estimation algorithm. Simulation results show that the improved algorithm has improved the estimation precision effectively,and this SNR estimation algorithm can be applied for OFDM systems of cable channel.