NDLI: A Comparison of Rateless Codes at Short Block Lengths

Content Provider	IEEE Xplore Digital Library
Author	Haoming Li Marsland, I.D.
Copyright Year	2008
Description	Author affiliation: Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, ON (Haoming Li; Marsland, I.D.)
Abstract	Raptor codes and rate-compatible low-density parity-check (RC-LDPC) codes have drawn much attention in recent years as they can approach channel capacity without requiring channel information at the transmitter. Raptor codes have been shown to uniformly approach the binary-input AWGN channel capacity, especially at low SNR's, whereas RC-LDPC codes have the potential to provide higher throughput than Raptor codes at high SNR's. In this paper, we use different message word sizes to compare the throughput of three rateless codes, namely, Raptor codes, rate-compatible irregular repeat-accumulate (RC-IRA) codes, and the rate-compatible quasi-cyclic LDPC (RC/QC-LDPC) codes proposed in the 3GPP2 and 802.20 standards. The comparison is focused on short message word lengths under 16-symbol quadrature amplitude modulation (16-QAM). The simulation results in the AWGN channel show that RC-IRA and RC/QC-LDPC codes outperform Raptor codes at high SNR's. Under frequency flat Rayleigh fading channels, RC-IRA codes outperform RC/QC-LDPC codes at high SNR's and perform slightly worse at low SNR's. We also show that for short block lengths, the throughput of RC-IRA codes is not particularly sensitive to the mother code rate, the belief propagation (BP) algorithm scheduling, the existence of parallel edges during check node combining, and the symbol degree distribution (for fixed average left degree).
Starting Page	4483
Ending Page	4488
File Size	457745
Page Count	6
File Format	PDF
ISBN	9781424420759
DOI	10.1109/ICC.2008.841
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput Parity check codes Channel capacity AWGN channels Transmitters Code standards Quadrature amplitude modulation Frequency Fading Belief propagation
Content Type	Text
Resource Type	Article

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