Patent ID: 6696900
Filing Date: 2004-02-24
Classification: H04L

Abstract:
In a PSK system having a transmitter for transmitting a PSK signal, and having a preamble period during which time no symbols are transmitted, a method for demodulating PSK modulated signals comprising the steps:(a) receiving said PSK modulated signal during said preamble period; (b) generating a reference signal; (c) detecting the phase difference between said PSK modulated signal and said reference signal and generating a first voltage level corresponding to said phase difference; (d) detecting the phase difference between said PSK modulated signal and said reference signal a second time after a predetermined phase delay and generating a second voltage level corresponding to said phase difference; and (e) adjusting the phase of the reference signal corresponding to the difference between said voltage levels to one of maximize and minimize the phase difference between the phase of the reference signals and the phase of the PSK modulated signal.