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Design of rate-compatible structured LDPC codes for hybrid ARQ applications

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3 Author(s)
Mostafa El-Khamy ; Corporate Research and Development, Qualcomm, San Diego (e-mail:, and ; Jilei Hou ; Naga Bhushan

In this paper, families of rate-compatible protograph-based LDPC codes that are suitable for incrementalredundancy hybrid ARQ applications are constructed. A systematic technique to construct low-rate base codes from a higher rate code is presented. The base codes are designed to be robust against erasures while having a good performance on error channels. A progressive node puncturing algorithm is devised to construct a family of higher rate codes from the base code. The performance of this puncturing algorithm is compared to other puncturing schemes. Using the techniques in this paper, one can construct a rate-compatible family of codes with rates ranging from 0.1 to 0.9 that are within 1 dB from the channel capacity and have good error floors.

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:27 ,  Issue: 6 )