Patent ID: 7170955

Claim:
A method for accurately detecting presence of a valid signal, the method comprises: determining energy of an input to produce a real-time energy level; delaying the input by period of the valid signal to produce a delayed input; correlating the input with the delayed input to produce a correlated input; determining energy of the correlated input to produce a correlated energy level; comparing the correlated energy level and the real-time energy level to determine probability that the input is a valid signal; generating a valid signal probability indication based on the probability that the input is a valid signal; determining a moving average of the correlated input; interpreting the moving average to determine end of an initialization sequence of the valid signal; interpreting the moving average with respect to the real-time energy level at the end of the initialization sequence; and indicating that the input is a valid signal when the interpreting the moving average with respect to the real-time energy level was favorable.