Patent ID: 6496982
Filing Date: 2002-12-17
Classification: H04H,H04N

Abstract:
Method for transmitting and receiving information over a cable TV network comprising at least one base station connected to a branched cable network branching outward from the base station to at least two subscribers provided with transmitters, the method comprising the steps of:assigning a unique carrier frequency to each of the subscribers' transmitters; selecting the carrier frequencies to be mutually orthogonal; transmitting signals from the subscribers' transmitters simultaneously, receiving the signals in the base station as a broadband signal and separating the signals with at least one common algorithm; introducing a protection period between transmitted symbols, the duration of said protection period forming a predefined part of the duration of the part of the algorithm separating the signals from the different subscribers' transmitters; and using the relationship between the duration of the protection period and the duration of the part of the algorithm separating the signals from the different subscribers' transmitters to determine a number of possible phase displacements. and the appearance of the phase displacements, for each separated signal.