摘要
针对宽带正交频分复用(OFDM)系统,提出了一种基于信道多径时延估计的自适应信道估计算法。文章分析了无线信道的特性,随后利用导频频域相关性进行多径时延估计,提出通过动态跟踪信道时延估计参数自适应选择信道估计中适宜的导频数目的方法,同时实现循环前缀(CP)长度的实时调整。仿真结果表明,在时变环境下,本文算法可以有效获知当前信道时延参数的近似统计信息,实现对系统冗余信息的优化。
In this paper, an adaptive channel estimation which based on delay spread detection algorithm was proposed in OFDM system. We utilize the frequency - domain correlation of pilot to estimate the channel condition. Then we can real time track the channel parameters and adaptive adjust the number of pilot and Cyclic Prefix （CP） length in transmitter. Simulation shows that this algorithm can obtain the approximately statistical information of channel model＇s delay parameters, and it can optimize the redundant characters of systems.
出处
《无线通信技术》
2009年第3期1-5,9,共6页
Wireless Communication Technology
基金
教育部"春晖计划"基金(Z2006-1-62006)
甘肃省自然科学基金
甘肃省高校研究生导师科研基金(0603B-03
0703-10)资助
关键词
OFDM
信道估计
时延估计
OFDM
channel estimation
delay spread estimation
