NDLI: LDPC code design for OFDM channel: graph connectivity and information bits positioning

Content Provider	IEEE Xplore Digital Library
Author	de Baynast, A. Sabharwal, A. Aazhang, B.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA (de Baynast, A.; Sabharwal, A.; Aazhang, B.)
Abstract	We present an optimized channel coding scheme for OFDM transmission. In the future wireless standards such IEEE 802.11n, frame error rates (FER) as low as 0.0001 are targeting. Irregular LDPC codes have excellent performance at moderate computational complexity: they are strong candidates for channel coding in such systems. In the context of an OFDM transmission, Mannoni et al. (2002) proposed to optimize the graph connectivity of the irregular LDPC code accordingly to the channel spectrum. However, their codes did not have good performance for a FER range of 0.001-0.0001. In this paper, we propose to optimize the LDPC code in two steps: first, we optimize the graph connectivity in order to get a minimum operational average SNR and therefore excellent FER; then we optimize the information bits placement accordingly to the channel. By simulation, we show that our approach provides substantial performance gain in term of FER over the existing methods (1 dB or more for FER equal to 10/sup -4/).
Starting Page	649
Ending Page	652
File Size	795383
Page Count	4
File Format	PDF
ISBN	0780390296
DOI	10.1109/ISSCS.2005.1511324
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-14
Publisher Place	Romania
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Quadrature amplitude modulation Error analysis Interference Performance gain Parity check codes OFDM modulation Decoding Channel coding Computational complexity
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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