基于数据辅助的CPM信号调制参数估计

石明军; 邓名桂; 周世东; 雷俊; 姚彦

doi:10.3724/SP.J.1146.2009.00523

基于数据辅助的CPM信号调制参数估计

doi: 10.3724/SP.J.1146.2009.00523

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出版历程
- 收稿日期: 2009-04-10
- 修回日期: 2009-06-18
- 刊出日期: 2010-05-19

On the Data-Aided Estimation of Modulation Parameters of CPM

摘要

摘要: 针对非合作条件下实现CPM信号相干解调，首先要准确估计CPM信号调制参数这一关键问题，该文提出了一种基于数据辅助的CPM信号调制指数与成型脉冲联合估计的新方法，使用符号间的相位差分消除CPM信号相位的记忆特性，采用最小二乘法获得调制指数和成型脉冲的联合估计。理论分析与数值仿真表明该方法是无偏的，当数据观测长度为N 时，其估计误差以1/N的速率收敛到0。算法适用于全响应和部分响应CPM信号，具有良好的抗噪声性能。
- 连续相位调制(CPM); 参数估计; 调制指数; 成型脉冲
Abstract: In non-cooperative communication scenarios, coherent demodulation of Continuous Phase Modulation (CPM) signals requires precise estimation of CPM modulation parameters. A new data-aided modulation index and shaping pulse joint estimation algorithm is proposed for CPM signals. The differential phase between symbols is used to eliminate signal phase memories, and Least-Square method is used for parameters estimations. Theoretical analysis and numerical simulations show that it is unbiased. The estimating error is converged to zero at 1/N where N is the length of observation data. The algorithm is applicable to both full and partial response CPM modulations and presents good anti-noise performance.

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