EP 1992072 A1 20081119 - CHECK-IRREGULAR LDPC CODES FOR UEP
Title (en)
CHECK-IRREGULAR LDPC CODES FOR UEP
Title (de)
IRREGULARITÄTSPRÜFUNG VON LDPC-CODES FÜR UEP
Title (fr)
CODES DE CONTRÔLE IRRÉGULIERS LDPC POUR UEP
Publication
Application
Priority
- EP 2007050842 W 20070129
- EP 06100979 A 20060127
- EP 07704196 A 20070129
Abstract (en)
[origin: WO2007085653A1] Data, especially when it is source coded multimedia information (video, speech, audio), often should be protected differently, since the effects of errors would lead to disturbances of different susceptibility. So-called "Unequal Error Protection (UEP) codes" are a suitable tool to protect data according to quality requirements or importance levels. Low-Density Parity-Check codes are generally known to be (almost) capacity-achieving. The common understanding was that they can be constructed to offer UEP properties by using different connection degrees at the bit-node side of the describing bi-partite Tanner graph. Involving a bit node into more checks, i.e., connecting it to more check nodes would improve the protection. However, the reliabilities of all bits grow with the number of iterations and the UEP properties finally disappear with the number of iterations. The invention proposes a method for the transmission of data of different sensitivities and realizes unequal error protection by an unequal distribution of connections (edges) to check nodes, representing the parity-check equations in the Tanner graph.
IPC 8 full level
H03M 13/11 (2006.01)
CPC (source: EP)
H03M 13/1148 (2013.01); H03M 13/356 (2013.01); H03M 13/618 (2013.01)
Citation (search report)
See references of WO 2007085653A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 2007050842 W 20070129; EP 07704196 A 20070129