摘要
在卫星通信系统中,噪声环境下的多径估计是消除多径干扰的前提。提出了一种基于MEDLL改进算法的多径估计方法,该方法先估计接收信号中多径信号幅度、相位和时间延迟参数,继而计算多径效应的误差值,从接收信号中分离多径信号,同时给出了基于MEDLL改进算法的理论推导过程。仿真结果表明该方法获得的接收信号误差很小,比一般的MEDLL算法在性能和精度上有很大改进,能够更有效地抑制多径效应,提高信号精度。结合信号接收机的实现原理,给出了该算法的实现过程。
In the satellite communications system,the multipath estimation in noise environment is the premise for elimination of the multipath interference.This paper proposes a multipath estimation method based on MEDLL improved algorithm.The signal amplitude,phase,time delay and other parameters are firstly estimated,then the errors caused by multipath effects are calculated and the multipath signal is separated from the received signal.Meanwhile,the theoretical deduction based on MEDLL improved algorithm is given.Finally,the simulation results show that the proposed method can effectirely suppress multipath effects and improve signal accuracy.
出处
《无线电通信技术》
2013年第4期11-13,共3页
Radio Communications Technology
关键词
多径
MEDLL
通信系统
噪声环境
multipath
multipath estimating delay lock loop
communications system
noise environment
