OFDM系统中一种改进的信噪比估计算法
发布时间：2018-11-18 13:19
【摘要】：在OFDM系统,SNR承担着监控信号质量的责任。主要研究了基于LMMSE信道估计的信噪比估计。针对现有算法的复杂度高,信噪比估计有偏的问题,提出了一种改进的修正算法。该方法通过无偏的噪声估计以及前后OFDM符号之间的迭代来实现快速收敛,并且直接利用LMMSE信道估计过程的系数来计算修正因子,计算复杂度低。经仿真表明,所提方法在高SNR时估计精度可提高2dB,误码率也有0.3d B的提升。
[Abstract]:In OFDM system, SNR is responsible for monitoring signal quality. The signal-to-noise ratio (SNR) estimation based on LMMSE channel estimation is studied. In order to solve the problem of high complexity and biased SNR estimation, an improved modified algorithm is proposed. This method achieves fast convergence by unbiased noise estimation and iterations between OFDM symbols, and directly uses the coefficients of the LMMSE channel estimation process to calculate the correction factor. The computational complexity is low. The simulation results show that the proposed method can improve the estimation accuracy by 2 dB and the error rate by 0.3 dB at high SNR.
【作者单位】： 展讯通信(上海)有限公司;
【分类号】：TN929.53
[Abstract]:In OFDM system, SNR is responsible for monitoring signal quality. The signal-to-noise ratio (SNR) estimation based on LMMSE channel estimation is studied. In order to solve the problem of high complexity and biased SNR estimation, an improved modified algorithm is proposed. This method achieves fast convergence by unbiased noise estimation and iterations between OFDM symbols, and directly uses the coefficients of the LMMSE channel estimation process to calculate the correction factor. The computational complexity is low. The simulation results show that the proposed method can improve the estimation accuracy by 2 dB and the error rate by 0.3 dB at high SNR.
【作者单位】： 展讯通信(上海)有限公司;
【分类号】：TN929.53
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