Method for detecting erasures

Details Method for detecting erasures Method for detecting erasures

H - Electricity

04

L

H04L 1/20 (2006.01) H04L 5/06 (2006.01) H04L 27/38 (2006.01)

Patent

CA 2147229

- 17 - ABSTRACT METHOD FOR DETECTING ERASURES A method is described for detecting erasures in a stream of sets of digital signal values received at a receiver side after transmission from a transmission side. Subsets of these sets are modulated on distinct carrier signals, each transmitted and received thus modulated carrier signal corresponding to one of a number of predetermined subset related points and to a receipt point on a carrier dependent modulation representing map respectively. The method includes the steps of: - selecting for each receipt point the nearest of the predetermined subset related points; - calculating a distance between the receipt point and the nearest subset related point and multiplying this distance with a map dependent weight factor; - summing the thus obtained weighted distances for all subsets of a set; and - marking the latter set as an erasure when the thus obtained result exceeds a predetermined threshold.

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