Digital Instantaneous Frequency Measurement of a Real Sinusoid Based on Three Sub-Nyquist Sampling Channels

Table 3

Computation complexity comparison of the FFT and frequency deduction.

Method	MULT.	ADD.	DIV.	Search numbers	Square root	Look-up-table
FFT	20480	20480	0	1024	0	0
Frequency deduction	52	47	1	0	1	1

MULT. represents multiplication operation, ADD. represents addition operation, and DIV. represents division operation.