基于循环自相关的PSK信号码速率估计的噪声影响分析
doi: 10.3724/SP.J.1146.2006.00962
Influence of Stationary Noise on Cyclic-Autocorrelation Based PSK Symbol Rate Estimation
-
摘要: 采用循环自相关函数或基于循环自相关的循环统计量可以有效地估计PSK信号的码速率。与理论分析结果不符的是，实际中不具有循环平稳性的平稳噪声仍对基于循环自相关处理的PSK码速率估计有影响。该文分析了这类影响产生的原因，推导了循环自相关处理后，不期望项(即由平稳噪声所产生的项)的均值和方差的数学表达式，并给出了高斯白噪声情况下的简化表达式。仿真实验证明了这些结论的正确性。Abstract: Symbol rate estimation of PSK signals could be effectively implemented by employing the cyclic-autocorrelation function or cyclic-autocorrelation based cyclic statistics. Stationary noise, which does not possess cyclostationarity, has an influence on cyclic-autocorrelation based PSK symbol rate estimation in practice, and this is not consistent with the theoretical analysis. The origin of such influence is studied in this paper, and the analytic expressions of means and variances of those undesired items (which are produced by stationary noise), as well as the simplified forms for Gaussian white noise are derived. Simulation experiments have testified the analytic results.
-
Gardner W A. Exploitation of spectral redundancy in cyclostationary signals. IEEE Signal Processing Magazine, 1991, 8(2): 14-36.[2]Gardner W A. Signal Interception: A unifying theoretical framework for feature detection[J].IEEE Trans. on Commun.1988, 36(8):897-906[3]Gardner W A, Brown W A, and Chen C. Spectral correlation of modulated signals: part II, digital modulation[J].IEEE Trans. on Commu.1987, 35(6):595-601[4]Tang S and Yu Y. Fast algorithm for symbol rate estimation[J].IEICE Trans. Commun.2005, e88-b(4):1649-1652[5]汤素华, 戴旭初, 徐佩霞等. 基于循环自相关的符号率估计[J].兵工学报.2005, 26(2):251-255[6]金艳, 姬红兵, 罗军辉. 一种基于循环统计量的直扩信号检测与参数估计方法[J].电子学报.2006, 34(4):634-637[7]金艳, 姬红兵. 基于循环自相关的PSK信号盲参数估计新方法[J].西安电子科技大学学报.2006, 33(6):892-895[8]Dandwate A V and Ginnakis G B. Statistical tests for presence of cyclostationarity[J].IEEE Trans. on SP.1994, 42 (9):2355-2369[9]于宏毅, 保铮. 平稳过程循环相关处理的有限数据消失特性. 西安电子科技大学学报, 1999, 26(2): 133-136.Yu H and Bao Z. Vanishing characteristics of stationary processes processed by cyclic correlation. Journal of Xidian University, 1999, 26(2): 133-136. -
计量
- 文章访问数: 3063
- HTML全文浏览量: 71
- PDF下载量: 877
- 被引次数: 0
下载:
