Method for identifying data encoded by PPM modulation, and receiver for said method

摘要

An identification method for a data Sk is disclosed which includes;
a) construction of a chronological sequence {T1; . . . ; Ti; . . . ; TN} of times of arrival Ti of pulses or a block of successive pulses,b) calculation of a value of similarity between this sequence {T1; . . . ; Ti; . . . ; TN} and a predetermined chronological sequence {TREFk1; . . . ; TREFkj; . . . ; TREFkM} of times of arrival coding the data Sk for several time offsets Ol between the sequence {T1; . . . ; Ti; . . . ; TN} and the sequence {TREFk1; . . . ; TREFkj; . . . ; TREFkM},c) identification of the data Sk in the series {T1; . . . ; Ti; . . . ; TN} if the calculated value of similarity for one of the time offsets Ol exceeds a predetermined threshold.

主权项

1. 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 {T1; . . . ; 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 {T1; . . . ; Ti; . . . ; TN} and a predetermined chronological sequence {TREFk1; . . . ; TREFkj; . . . ; TREFkM} of times of arrival coding said data Sk for several time offsets Ol between said series [T1; . . . ; Ti; . . . ; TN} and said sequence {TREFk1; . . . ; 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 {T1; . . . ; Ti; . . . ; TN} and said sequence {TREFk1; . . . ; TREFkj; . . . ; TREFkM} for a given time offset Ol, c) identification of said data Sk in said series {T1; . . . ; 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.