摘要： 基于最小均方误差方法，在双衰落信道下，提出利用周期PN序列作为导频的信噪比(SNR)估计算法。在导频2侧插入保护间隔降低子载波间干扰对导频的影响，在时域进行相关运算消除噪声干扰，从而得到较精确的信道参数。仿真结果表明，该算法能较准确估计SNR，且可通过改变周期PN序列满足不同信道环境下的性能要求。

关键词: 正交频分复用, 信噪比估计, 双衰落信道, 周期PN序列

Abstract: Based on Minimum Mean Squared Error(MMSE) method, this paper presents Signal to Noise Ratio(SNR) estimation algorithm by using periodic PN sequence as pilot under Double Fading Channel(DFC). It inserts guard space at each edge of pilot to reduce the influence of Inter-Carrier Interference(ICI), and avoids noise interference by going on correlation operation in time domain to get more precise channel parameter. Simulation result shows that this algorithm can more accurately estimate SNR, and it can satisfy performance requirement under different channel environment by changing periodic PN sequence.

Key words: Orthogonal Frequency Division Multiplexing(OFDM), Signal to Noise Ratio(SNR) estimation, Double Fading Channel(DFC), periodic PN sequence

中图分类号: 

• TN929.5