Patent ID: 7817728
Filing Date: 2010-10-19
Classification: H04B,H04L

Abstract:
1. A method for demodulating data transmitted in a telecommunication system including at least one transmitter and one receiver, said transmitter being configured to transmit a signal formed by at least one pulse sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position within its relevant time window is defined by a chip number, which method comprises: decoding during at least one symbol decoding executed in said receiver to compute at least one modulation value representative of an amount of power carried by each pulse sequence; and comparing the modulation value to at least one predetermined threshold value, wherein the predetermined threshold value has previously been determined by equating a first and a second probability density function representing a likelihood for the transmitted signal to carry a first symbol and a likelihood for the transmitted signal to carry a second symbol, respectively, so that information carried by pulse sequences may be recovered at the receiver without said receiver having to precisely map the pulse sequences, and each signal to be transmitted is constituted by a superimposition of a predetermined number of pulse sequences, each pulse sequence having been subjected to symbol encoding and corresponding to one of several sub-bands into which a total bandwidth available for transmission has previously been divided.