Patent ID: 8837574

Claim:
A method for identifying a data Sk encoded by PPM modulation (Pulse Position Modulation) in a received signal, said method comprising: a) construction of a chronological series {T 1 ; . . . ; Ti; . . . ; Tn} of times of arrival Ti of successive pulses or blocks of pulses contained in said received signal, b) calculation of a value of similarity between said series {T 1 ; . . . ; Ti; . . . ; TN} and a predetermined chronological sequence {TREFk 1 ; . . . ; TREFkj; . . . ; TREFkM} of times of arrival coding said data Sk for several time offsets Ol between said series [T 1 ; . . . ; Ti; . . . ; TN} and said sequence {TREFk 1 ; . . . ; TREFkj; . . . ; TREFkM}, each value of similarity being based on differences between time pairs (Ti; TREFkj) so as to be representative of a correlation between said series {T 1 ; . . . ; Ti; . . . ; TN} and said sequence {TREFk 1 ; . . . ; TREFkj; . . . ; TREFkM} for a given time offset Ol, c) identification of said data Sk in said series {T 1 ; . . . ; Ti; . . . ; TN} if said calculated value of similarity for one of said time offsets Ol exceeds a predetermined threshold, wherein said calculation of said value of similarity for a given time offset includes: counting differences between time pairs (Ti; TREFkj) which are included in a range of values containing said time offset, and computation of said value of similarity from a result of said counting step.