【摘要】 上行链路中的粗频偏及定时估计是多用户 OFDM系统的关键技术之一。如果粗频偏估计不准 ,将带来严重的子载波间干扰 ( ICI) ,而定时估计引入的符号间干扰 ( ISI)虽然可以通过加入保护间隔予以消除 ,但是如果定时估计不稳定将影响整频偏移的估计及均衡的效果。本文提出了一种基于 PN序列的粗频偏及定时估计 ,仿真结果表明该方法具有良好的性能更多还原

【Abstract】 The estimation of the coarse frequency offset and timing is one of the key technology in the uplink multiuser OFDM system. If the estimation of coarse frequency offset is not correct, serious ICI will be caused, and if the timing is unstable, the ISI that it causes can be eliminated by adding CP, but it will affect the estimation of the integral frequency offset and the performance of the equalization. In this paper, a new algorithm for estimating the coarse frequency offset and timing based on PN sequence is presented, and the results of simulation show that it has better performance.更多还原