  Spatially-coupled low-density lattice codes (LDLC) are constructed using
protographs. Using Monte Carlo density evolution using 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 lattice construction.
