一种针对压缩域信号的新型锁相环技术

针对通信信号压缩采样获得的压缩域信号频率、相位提取问题，提出了一种基于压缩感知的新型锁相环技术。通过深入研究压缩域的信号估计问题，提出了压缩域锁相环路，可以直接在压缩域同步跟踪信号频率和相位变化，不再需要高复杂度的信号重构处理。分析了环路模型及其估计性能，并针对该锁相环可行性和性能分别进行了仿真实验。仿真结果不仅验证了压缩域锁相环的可行性，同时表明该环路能够实现高动态信号的高精度频率提取。压缩域锁相环的应用潜力较大，例如可以作为压缩感知通信接收机的同步解调方法。

A new phase locked loop technique for compressed domain signal

To deal with the issue of compressed communication signal frequency and phase extraction,a new phase locked loop(PLL) technique based on compressive sensing is proposed. Firstly,the compressed domain PLL model is established on the basis of signal estimation analysis in compressed domain,which can directly track the frequency and phase information without reconstructing the original signal. Then,the estimation performance is explored by analyzing the model. Finally,the feasibility and performance of the proposed technique are investigated by simulation experiments. The results show that the technique is feasible,and the loop can accurately extract the high dynamic signal frequency. The proposed PLL has a great potential for the application. For instance,it can be used for synchronous demodulation in the communication receiver based on compressive sensing.