LDPC-Coded Modulations: Performance Bounds and a Novel Design Criterion
Konferenz: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
03.04.2006 - 07.04.2006 in Munich, Germany
Tagungsband: TURBO - CODING - 2006
Seiten: 6Sprache: EnglischTyp: PDFPersönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt
Franceschini, Michele; Ferrari, Gianluigi; Raheli, Riccardo (Dipartimento di Ingegneria dell’Informazione, University of Parma, Parma, 43100 Italy)
In this paper, we present a novel design criterion for low-density parity-check (LDPC)-coded modulations based on the concatenation of an LDPC code with a coded modulator (CM) tailored for the specific transmission channel. Although we use an analysis based on extrinsic information transfer (EXIT) charts, we focus on the bit error rate (BER) performance as opposed to the convergence threshold. First, we characterize the convergence behavior of the decoding process as a function of the LDPC code degree distributions. Then, the BER performance is accurately estimated by deriving upper and lower bounds as functions of the extrinsic information.