NDLI: Linear Time Encoding of Low-Density Parity Check Codes and its Performance in Weak Atmospheric Turbulent Channels

Content Provider	IEEE Xplore Digital Library
Author	Jiajie Chen Xiaofeng Li Yanhui Liu
Copyright Year	2007
Description	Author affiliation: Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu (Jiajie Chen; Xiaofeng Li)
Abstract	A major drawback of low-density parity -check (LDPC) Codes is their apparently high encoding complexity and consequent encoding delay. A linear time encoding method proposed by Richardson and Urbanke can effectively reduce the encoding complexity to only linear encoding complexity. In this paper, LDPC codes based on the linear time encoding method is adopted for improving the bit-error rate (BER) performance of an on-off keying (OOK) modulated optical signal through a weak atmosphere turbulence channel. The optical atmosphere channel is modeled as a stationary ergodic channel with lognormal intensity fading. We simulate and analyze the BER performance of the channel using the linear time encoding method. Simulation results show that the presented encoding method can be greatly reduce the BER Moreover, as the code length increases or code rate decreases, the coding gain of LDPC codes over the uncoded system becomes large. Therefore, the presented encoding method with both large code length and low code rate obtain high encode gain for the optical atmosphere turbulence channel.
Starting Page	2948
Ending Page	2951
File Size	134874
Page Count	4
File Format	PDF
ISBN	9781424413119
DOI	10.1109/WICOM.2007.732
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-21
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Analytical models Atmospheric modeling Bit error rate Atmosphere Parity check codes Performance analysis Optical modulation Delay Modulation coding
Content Type	Text
Resource Type	Article

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