Abstract: A new method for estimating t
he frequency from wide-band under-sampled data is proposed. With the aid of al
iased frequency information from two independent sampling channels and the propo
sed pairing method, we can solve the frequency ambiguity. Furthermore, the propo
sed method is not sensitive to the amplitude and phase errors of both channels a
nd data obtained from two channels can be processed separately, and thus it has
a wider applied field than the existing methods. The high estimation accuracy of
this proposed algorithm is confirmed by comparing simulation results with CRLB
accomplished at the end of this paper.

Key words: wide-band, under-sampled, frequency ambiguity, pairing method