摘要
针对低信噪比多径信道下传统的正交频分复用(OFDM)信号子载波数估计方法存在估计性能不高、计算复杂度高等问题,提出了一种新颖的OFDM信号子载波数估计方法。首先计算接收信号的自相关矩阵,然后对此自相关矩阵进行特征分解,提取分解后的特征值,最后根据特征值的分布特性实现子载波数目的估计。仿真结果验证了该方法在高斯白噪声信道和多径信道条件下对OFDM信号子载波数估计的有效性与可靠性。
Aiming at the poor performance and high computation complexity problem of traditional estimation methods for the number of the subcarriers of the OFDM signal in low signal noise ratio and muhipath channel, this paper proposed a novel method to estimate the number of the OFDM signal. Firstly, it calculated the autocorrelation matrix of the received OFDM signal. Secondly, it implemented the eigen-decomposition for the autocorrelation matrix and extract all the eigenvalues. Finally, it estimated the number of the snbcarriers of the OFDM signal according to the distribution characteristic of the eigenvalnes. The experimental results prove the effectiveness and reliability of the proposed method under the Gaussian white noise and multipath channel circumstance.
出处
《计算机应用研究》
CSCD
北大核心
2017年第1期211-213,共3页
Application Research of Computers
基金
安徽省自然科学基金资助项目(1308085QF99
1408085MF129)
国家自然科学基金资助项目(61272333
61473237)
关键词
OFDM
子载波数估计
自相关矩阵
特征分解
计算复杂度
OFDM
subcarrier number estimation
autocorrelation matrix
eigen-decomposition
computation complexity
