针对 mW(m-Walsh)复合序列扩频信号的参数估计问题，根据循环谱理论推导了mW 复合序列扩频信号的循环谱表达式，并结合 Walsh 序列的频谱特征分析了 mW 复合序列扩频信号的循环谱特征，提出了基于循环谱的参数估计算法． 针对 mW 复合序列循环谱的获取所需采样率较高的问题，引入压缩循环谱技术，通过信号的压缩采样值来重构循环谱． 实验结果表明，利用压缩采样理论能有效地重构出信号循环谱，并实现对 Walsh序列序号、m 序列码片速率和载频等参数的有效估计．

In order to implement the parameter estimation of mW (m-Walsh) composite-sequence spread spectrum signals,the corresponding cyclic spectrum is derived according to the theory of cyclic spectrum,and the feature of cyclic spectrum is analyzed on the basis of spectrum characteristics of Walsh sequence,with a parameter estimation algorithm on the basis of cyclic spectrum being also presented.Moreover,a compressive cyclic spectrum is intro- duced to meet the high-rate sampling for the calculation of cyclic spectrum.Thus,the cyclic spectrum can be reconstructed from compressive samples.Simulated results indicate that the introduction of compressive sampling helps effectively reconstruct the cyclic spectrum and estimate the sequence number of Walsh sequence,the chip rate of m sequence as well as the carrier frequency.