摘要
基于LS(Lease Squares)的OFDM盲同步算法,提出了一种性能优良的OFDM盲同步算法。在接收端,采样周期取为原算法的M倍,计算出采样点处的判决函数值,然后对判决函数值从大到小排序,找到若干个最小的判决函数值对应的采样点,并找出这若干个采样点的最左端和最右端的位置,最后取最左端和最右端位置的中间位置作为符号定时判决点。仿真结果表明:在不同权重系数及强脉冲噪声干扰的电力线多径衰落信道中,该算法比文献[3,7,8]取得了更好的符号同步效果。
Based on LS blind synchronization algorithm, a robust blind synchronization method tor OFDM is proposed. At the receiving end, the sampling period is made to be M times of the original algorithm, thus to calculate the decision function value of the sampling points, and then the numerical value of the decision function is sorted from big to small to find the several sampling points corresponding to the minimum decision function values, then to find their most left side and right side timing point from the several timing points, of which the median is screened out for the result . Computer simulation indicates that the proposed estimator can outperform the blind symbol timing estimators proposed in the literature [3] and[7]-[8] in the multipath fading power-line channel with different weight coefficients and strong pulse noise.
出处
《通信技术》
2016年第9期1129-1133,共5页
Communications Technology
关键词
OFDM
LS
盲同步
信道
OFDM
LS
blind synchronization
channel
