Improved Rife Algorithm for Frequency Estimation of Sinusoid Wave
Zhao Guo-qing · Signal Processing · 2010
Because the frequency estimate precision of Rife algorithm has a great deviation when the signal real frequency is near to the discrete frequency,but the frequency estimate precision can reach Cramer-Rao lower bound when the signal frequency is near to the midpoint of two neighboring discrete frequencies.An improved Rife(I-Rife) algorithm is presented by moving the signal frequency to the midpoint area of two neighboring discrete frequencies and then the frequency is estimated by Rife algorithm.The ill-judged probability of correctional frequency direction can decrease sharply after using improved criterion.The I-Rife algorithm holds on higher precision even when the SNR reaches to -13dB,but it need lower workload owing to using spectrum subdivision technique.The simulation results indicate that I-Rife algorithm not only has good frequency estimation precision,but also has a good stability in all frequency domains. Frequency estimation of sinusoid wave based on the I-Rife algorithm can be achieved in real-time.It can be implemented easily by the hardware.