Patent ID: 7751518

Claim:
A method applied in a personal handy-Phone system (PHS) for detecting preamble symbol and timing recovery, comprising the steps of: sampling a plurality of symbols of the PHS by an N-time sampling frequency to have N sampling points; obtaining an amplitude from each sampling point, and using the amplitude of M sampling points as a moving average amplitude to compute a moving average amplitude {tilde over (x)}; computing a vector average of Z symbols from said N sampling points after said each sampling point is multiplied by a phase control signal which is alternately 1 and −1; obtaining amplitudes by using said vector average of said N sampling points and computing a maximum {tilde over (y)} from the amplitudes of said N sampling points; and when the maximum {tilde over (y)} is larger than the moving average amplitude {tilde over (x)}, preamble symbol is found, and said sampling point is an optimal symbol timing.