基于双门限判决修正Rife算法的正弦信号频率估计

针对正弦信号频率估计复杂度和性能难以兼顾的问题，提出一种基于双门限判决修正Rife算法的频率估计算法。将信号频点划分为3个区域分别采用不同处理方案，具有估计精度高、运算量小的特点，适用于低功耗、低延时等应用场合。仿真结果表明，该方法克服了经典Rife算法在部分频点估计误差大的问题，其频率估计均方根误差距离克拉美罗界仅有0.5dB。与现有其它改进Rife算法相比，该方法在保证估计性能基本不变的前提下大幅降低所需计算量，有利于工程实现。 

Frequency Estimation of Sinusoid Based on the Dual-Threshold Decision Modified Rife Algorithm

In order to make a good tradeoff between the complexity and performance for frequency estimation of sinusoid, a frequency estimation algorithm with high estimation accuracy and low computation was proposed based on the dual-threshold decision fixed Rife algorithm. The frequency was divided into three domains with different processing schemes, which would be suitable for low power consumption and low-delay applications. Simulation results show that the method overcomes the inherent flaw of the classic Rife algorithm, and the RMS (root mean square) error for the estimated frequency is only 0.5 dB from the CRB (Cramer-Rao Bound). Compared with other improved Rife algorithms, the new approach can significantly reduce the required computation under the premise of guaranteeing the performance of estimation, be propitious to the engineering.