|| Euclidean Distance Spectra of Irregular NB LDPC coded QAM Signals with Optimized Mappings
||Irina Bocharova, Boris Kudryashov, St.-Petersburg, ITMO university, Russia; Vitaly Skachek, University of Tartu, Estonia|
||D1-S4-T2: LDPC Codes II
||Monday, 12 July, 23:00 - 23:20
||Monday, 12 July, 23:20 - 23:40
Properties of non-binary (NB) LDPC codes used in conjunction with coded modulation systems are studied. It is observed that the performance of the NB LDPC coded transmission schemes strongly depends on the mapping between the NB symbols and the signal constellation points. The Euclidean distance spectra for an ensemble of random NB LDPC codes for specific mappings are derived. The simulation results for belief-propagation decoding in the coded modulation schemes with the NB QC-LDPC codes under different mappings are presented.