Threshold improvement of low-density lattice codes via spatial coupling

Spatially-coupled low-density lattice codes (LDLC) are constructed using protographs. By using Monte Carlo density evolution with single-Gaussian messages, we observe that the threshold of the spatially-coupled LDLC is within 0.22 dB of capacity of the unconstrained power channel. This is in contras...

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Bibliographic Details
Main Authors: Uchikawa, H., Kurkoski, B. M., Kasai, K., Sakaniwa, K.
Format: Conference Proceeding
Language:eng ; jpn
Subjects:
Couplings
Lattices
Maximum likelihood decoding
Monte Carlo methods
Noise
Parity check codes
Online Access:Request full text
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Summary:Spatially-coupled low-density lattice codes (LDLC) are constructed using protographs. By using Monte Carlo density evolution with single-Gaussian messages, we observe that the threshold of the spatially-coupled LDLC is within 0.22 dB of capacity of the unconstrained power channel. This is in contrast with a 0.5 dB noise threshold for the conventional LDLC construction.
DOI:10.1109/ICCNC.2012.6167364