基于OFDM无线通信系统的线性回归频偏估计算法

为了适应 60 GHz新型 WiFi 对频偏同步的要求, 提出了一种基于 IEEE802.11ad - 2012 修正案系统 的 线性回归频偏估计 (LROE)算法 。 算法将接收到的前导序列与本地序列进行互相关运 算,然后提取 互相关 值的 相位角进行线性回归计算 , 估计出频偏值。 从理论 推导了算法在高斯信道和多径信道下 的 抗噪声 和 抗多径 性能。 在 多径 信道仿真中, 本算法 的频偏 估计精度优于传统自相关算法 3个 数量级, 满足了系统 对高精度频偏估计的要求。 在全系统仿真中,对比研究了本算法和自相关算法对系统 误比特率(BER)性能 的影响, 并与无频偏对照组仿真进行对比。 LROE 算法的 BER 明显优于自相关算法。 仿真研究表明, LROE 算法基 本消除了频偏对系统BER的影响, 其性能 达到了无频偏 系统 的效果 ,达到了 60GHz 系统对频偏同步的 要求。

Linear regression frequency offset estimation algorithm based on OFDM wireless communication system

In order to adapt to the new 60GHz WiFi on frequency synchronization requirements,this paper presents a linear regression offset estimation (LROE) algorithm based on IEEE802.11ad-2012- amendment system . T he algorithm cross - correlate s the received preamble sequences with the local sequence s ,and then extract s the phase angle of the cross - correlation value to estimate the frequency offset by using the linear regression calculatio n.In the Gaussian channel and multipath channel, the algorithm performance of anti - noise and anti - multipath is analyzed in theory.In the multipath channel simulation, its accuracy of the estimation is beyond the traditional auto- correlation algorithm by three orders of magnitude,and it satisfies the accurate requirements in the frequency estimation system. In the whole sys tem simulation, compared with the traditional auto - correlation algorithm and the LROE algorithm ,the performance of the BER is studied,and a no frequency offset control group simulation is set up for comparison.The bit error rate of the L ROE algorithm is obvious ly better than the traditional auto - correlation algorithm . Simulation results show that the LROE algorithm eliminate s the frequency offset of the bit error rate of the system, and its performance has achieved no frequen cy offset . The frequency offset synchronization requirement of t he whole 60GHz system is realized by the LROE algorithm.