摘要
在O FDM系统中,由于定时恢复、频率同步和信道估计之间存在密切联系,时延和频偏的估计误差会影响信道响应估计的准确性.本文采用IEEE802.11a无线局域网系统标准定义的训练序列进行联合估计.考虑系统性能优化和算法简化,将处理过程分成两步,首先得到粗的同步和信道响应估计,再利用得到的结果进行细同步和信道估计.实验结果显示信道估计精度高,系统误码率低.
Timing and frequency synchronization and channel estimation can affect each other in OFDM system. This paper investigates a combined estimation scheme based on one training signal which is defined in the IEEE 802. lla WLAN system. The scheme includes two stages for performance improvement and simplicity. At the first stage,the coarse timing and frequency offset and channel response are obtained. The fine synchronization and channel response based on the coarse stage are obtained at the second stage. The simulation results show the effectiveness of the proposed estimation.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第3期508-512,共5页
Acta Electronica Sinica
