Abstract:

Aimed at the problems that the central dot of sample sequence has particular requirement and the frequency estimation can be affected while the absolute value of frequency offset approximates 0.5 in all phase spectrum analysis algorithm, an improved spectrum analysis algorithm for all phase timeshift phase difference is proposed. In this algorithm, first of all, the original sequence is cyclically shifted a bit to the left, which can generate two sequences with only a bit timeshift relation. Then all phase fast Fourier transform (APFFT) is implemented on the two sequences respectively. The phase difference compensation is omitted so as to avoide the frequency offset, and the signal’s frequency and original phase estimation can be acquired by direct computation with the phase difference on the main spectral positions of the two sequences. Simulation results show that this algorithm is convenient and has high parameters estimation precision and stable frequency estimation precision.