Frequency estimation based on complex correlation with time-interleaved ADC

In this paper, a frequency estimation method based on complex correlation is proposed with TIADC (time-interleaved ADC) theory. Firstly, received signal is processed by amplification, filter, and quadrature demodulation. Then, TIADC is adopted to data acquisition, and parallel operation of complex correlation is used to deal with complex signal. Finally, signal frequency is acquired with phase angle obtained by arctangent function. Also, the detailed implementation and testification with FPGA are presented. The testification results show that the method can not only reduce time of frequency calculation, but also improve estimation precision with strong anti-interference performance.