Patent ID: 6829317
Filing Date: 2004-12-07
Classification: H04L

Abstract:
A signalling method in a radio communication system, comprising the steps of:transmitting from a first station, toward at least one second station, a radio signal formed from a first complex baseband signal generated in response to a flow of digital symbols according to a phase modulation such that the modulated phase is anti-symmetrical as a function of the symbols of the flow, wherein the first baseband signal contains a synchronisation signal generated in response to at least one synchronisation sequence contained in said flow of symbols and selected from a predetermined set on the basis of signalling information to be supplied to the second station; obtaining at the second station a second baseband signal from a received radio signal; detecting the synchronisation signal in a portion of the second baseband signal to compute synchronisation parameters and/or parameters for estimating a radio transmission channel, wherein the step of detecting the synchronisation signal comprises detecting a synchronisation pattern by performing a search of several patterns in the second baseband signal; using the computed parameters to demodulate another portion of the second baseband signal and extract transmitted information therefrom; and obtaining said signalling information on the basis of the detected synchronisation pattern, wherein the predetermined set of synchronisation sequences contains at least one first sequence, giving rise to a synchromsation pattern whose real and imaginary parts have substantially identical auto-correlations and a cross-correlation substantially lower than said auto-correlations, and a second sequence opposite the first sequence.