IEEE 802.11a中的载波频率估计技术

Carrier Frequency Estimation Technique for IEEE 802.11a

本文设计了一种针对无线局域网 IEEE 802.11a 系统的载波频率偏移的同步方法。802.11a 结合了基于 OFDM 技术的传输体制并且可以提供最高能达到54 Mbit/s 的多种传输速率。这种算法试图提供一种捕获以及跟踪阶段的载波频率偏差的估计以及补偿的方法。经过同步以及均衡的处理后,用误差向量的数量级来估计系统在 AWGN 以及多径衰落信道下的性能。经过仿真验证,这种算法在合理的复杂度之内有效的解决了载波频率偏差的问题。

This paper describes a synchronization method for cartier frequency offset （CFO） m wireless LAN LEEE 802.11a system, which adopts OFDM-based transmission techniques and provides several different transmission data rates up to 54Mbit/s. The algorithm prop.osed provides an estimation and compensation method for CFO in acquisition and tracking stages. Affer the processes of synchronization and equalization, the error vector magnitude is tised to evaluate the system＇s performance in both AWGN and multipath fading channels. According to the simulation results, the algorithm resolves CFO problems efficiently with reasonable complexity.