DocumentCode :
2948980
Title :
Optimization of LDPC Codes for Receiver Frontends
Author :
Lechner, Gottfried ; Sayir, Jossy ; Land, Ingmar
Author_Institution :
Telecommun. Res. Center Vienna
fYear :
2006
fDate :
9-14 July 2006
Firstpage :
2388
Lastpage :
2392
Abstract :
The degree distribution of low-density parity-check (LDPC) codes is optimized for systems that iterate over the receiver frontend, e.g., soft detector, demodulator, equalizer, etc., and the LDPC decoder. The overall extrinsic information transfer (EXIT) function of an iterative LDPC decoder is computed, based on the code´s own EXIT chart, under the Gaussian assumption. While the optimization of the variable node distribution is a nonlinear problem, the optimization of the check node distribution is shown to be a linear problem. This fact is exploited to design codes where both the variable and the check node distributions are optimized, resulting in more robust constructions. The technique presented requires only knowledge of the measured EXIT function of the receiver frontend
Keywords :
Gaussian distribution; iterative decoding; optimisation; parity check codes; receivers; Gaussian assumption; LDPC codes; extrinsic information transfer; iterative LDPC decoder; low-density parity-check codes; nonlinear problem; optimization; receiver frontends; variable node distribution; Communications technology; Curve fitting; Demodulation; Design optimization; Detectors; Equalizers; Iterative decoding; Parity check codes; Robustness; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory, 2006 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
1-4244-0505-X
Electronic_ISBN :
1-4244-0504-1
Type :
conf
DOI :
10.1109/ISIT.2006.262016
Filename :
4036398
Link To Document :
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