摘要
分析了多径直扩信号的循环平稳特性,推导了其循环相关函数和循环谱表达式。提出了一种基于循环谱包络的多径直扩信号的码元速率和载频估计算法,给出了实现步骤。算法不需要伪码等先验信息,可实现对信号参数的盲估计,且参数估计是在非零循环频率上进行一维搜索,避免了平稳噪声或干扰的影响,适用于低信噪比情况。计算机仿真实验验证了该算法的有效性。
The cyclostationary property of muhipath DS signals is analyzed, the expressions of both the cy- clic correlation function and cyclic spectrum are deduced, and a novel parameter estimation algorithm of DS sig- nals is presented based on cyclic spectrum amplitude. This algorithm can implement blind estimation without a prior knowledge of pseudorandom sequence and signal parameters. It is more efficient for only one-dimensional search in non-zero cyclic frequencies, which can avoid the affection of stationary noise and interference and is suitable for the estimation of the low input signal-to-noise ratio. Finally, the computer simulation shows that the algorithm is effective.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2008年第8期1427-1430,共4页
Systems Engineering and Electronics
关键词
直扩信号
多径
循环平稳
码元速率
载频
DS signal
muhipath
cyclostationarity
symbol rate
carrier frequency
