Capacity of the Gaussian Two-way Relay Channel to within 1/2 Bit

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Physical-layer network coding: Tutorial, survey, and beyond (2011, methodology): “[14,36] considered a scheme with a similar spirit as XOR - CD , using the nested lattice code instead of XOR.”
Compute-and-Forward: Harnessing Interference Through Structured Codes (2009, background): “Nam, Chung, and Lee generalized this nested lattice strategy to include asymmetric power constraints [35], found the capacity to within half a bit [36], and extended their scheme to Gaussian multiple-access networks [37].”