基于保护间隔的OFDM信号信噪比估计算法

摘要

Since SNR is playing an important role in signal processing for OFDM ,a kind of SNR estima‐tion is proposed based on the guard interval .The channel model and the guard interval are analyzed . Firstly ,two OFDM signals with different guard intervals are discriminated by using correlation function . Then ,according to the structure characteristics of two different guard intervals ,two kinds of SNR esti‐mations are put forward .Finally ,the SNR estimation is completed by combining the discriminant results with estimation algorithm .The simulation results show that the algorithm does not need auxiliary data and has good performance in different SNR conditions .%针对信噪比在O FDM信号处理中的重要作用，提出一种基于保护间隔的O FDM信号信噪比估计算法。通过对信道模型和保护间隔的分析，首先利用相关性函数完成两种不同保护间隔的O FDM信号的判别，然后根据两种不同保护间隔的结构特点，分别提出两种不同的信噪比估计方法，最后将判别结果与相应的信噪比估计算法相结合，完成O FDM 信号的信噪比估计。仿真结果表明，该算法不需要辅助数据，在不同的信噪比条件下均具有较好的识别效果。