Authors:
W. Proß
1
;
M. Otesteanu
2
and
F. Quint
3
Affiliations:
1
Politehnica University of Timisoara and University of Applied Sciences, Romania
;
2
Politehnica University of Timisoara, Romania
;
3
University of Applied Sciences, Germany
Keyword(s):
Irregular LDPC Codes, Density-evolution, Downhill-simplex, Markov-modulated Gaussian Channel.
Related
Ontology
Subjects/Areas/Topics:
Architecture and Protocols
;
Design and Implementation of Signal Processing Systems
;
Digital Audio and Video Broadcasting
;
Mobile Multimedia (GSM, GPRS, RF, Wi-Fi,…)
;
Multimedia
;
Multimedia and Communications
;
Multimedia Devices
;
Multimedia Systems and Applications
;
Telecommunications
Abstract:
This paper deals with the design of short irregular Low-Density Parity-Check (LDPC) codes. An optimization method for the underlying symbol-node degree-distribution (SNDD) of an irregular LDPC code is introduced, which is based on the Downhill-Simplex (DHS) algorithm. In order to compare our method with the optimization described in (Hu et al., 2005), which is based on a simplified version of the DHS algorithm, we first designed a rate 0.5 irregular LDPC code of length n = 504 for an Additive White Gaussian Noise Channel (AWGNC). The proposed optimization method was then used to design an irregular LDPC code for a Markov-modulated Gaussian Channel (MMGC). The decoding performance of the resulting LDPC code is then compared to the design based on the Density-Evolution (DE) method.