Abstract

A low computational complexity scheme based on the modified Wigner–Ville distribution (MWVD) is developed for estimating the instantaneous frequency of continuous phase modulation (CPM) signals under low signal-to-noise ratio (SNR) scenario. To simplify the computation of the MWVD, a low order Chebyshev polynomial is chosen as the kernel function for suppressing the cross-terms. The implementation of this instantaneous frequency (IF) estimator is done through the Viterbi algorithm. The simulation results show that our scheme outperforms other estimating methods under low SNR scenario.

中文翻译：

---

低复杂度方法恢复低信噪比的连续相位调制信号

摘要

开发了一种基于修正的Wigner-Ville分布（MWVD）的低计算复杂度方案，用于估计低信噪比（SNR）情况下连续相位调制（CPM）信号的瞬时频率。为了简化MWVD的计算，选择低阶Chebyshev多项式作为抑制交叉项的核函数。此瞬时频率（IF）估算器的实现是通过维特比算法完成的。仿真结果表明，在低信噪比的情况下，该方案优于其他估计方法。