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Regular and irregular progressive edge-growth tanner graphs

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3 Author(s)
Xiao-Yu Hu ; Zurich Res. Lab., IBM Res., Switzerland ; Eleftheriou, E. ; Arnold, D.M.

We propose a general method for constructing Tanner graphs having a large girth by establishing edges or connections between symbol and check nodes in an edge-by-edge manner, called progressive edge-growth (PEG) algorithm. Lower bounds on the girth of PEG Tanner graphs and on the minimum distance of the resulting low-density parity-check (LDPC) codes are derived in terms of parameters of the graphs. Simple variations of the PEG algorithm can also be applied to generate linear-time encodeable LDPC codes. Regular and irregular LDPC codes using PEG Tanner graphs and allowing symbol nodes to take values over GF(q) (q>2) are investigated. Simulation results show that the PEG algorithm is a powerful algorithm to generate good short-block-length LDPC codes.

Published in:

Information Theory, IEEE Transactions on  (Volume:51 ,  Issue: 1 )