Design of LDPC codes for two-way relay systems with physical-layer network coding
Date
2013
Authors
Tanc, A. K.
Duman, T. M.
Tepedelenlioglu, C.
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
This letter presents low-density parity-check (LDPC) code design for two-way relay (TWR) systems employing physical-layer network coding (PLNC). We focus on relay decoding, and propose an empirical density evolution method for estimating the decoding threshold of the LDPC code ensemble. We utilize the proposed method in conjunction with a random walk optimization procedure to obtain good LDPC code degree distributions. Numerical results demonstrate that the specifically designed LDPC codes can attain improvements of about 0.3 dB over off-the-shelf LDPC codes (designed for point-to-point additive white Gaussian noise channels), i.e., it is new code designs are essential to optimize the performance of TWR systems.
Description
Keywords
Density evolution, Additive white Gaussian noise channel, Degree distributions, Density evolution, Low-density parity-check (LDPC) codes, Optimization procedures, Physical-layer network coding, Relay channels, Two-way relay systems, Decoding, Design, Forward error correction, Network coding, Optimization