Figure 6

Bounds on the capacity region of the restricted half-duplex Gaussian two-way relay channel for N ₁ = N ₂ = N _R = 2 , P ₁ = P ₂ = P _R = 10, and α = 4 ; complex random channel coefficients: ${\left[{\mathit{H}}_{\text{AB}}\right]}_{\mathit{k},\mathit{\ell }}\sim {\mathcal{N}}_{\mathbb{C}}(0,{\mathit{d}}_{\text{AB}}^{-\mathit{\alpha }})$ iid. (results for one particular channel realization). (a) d _1R = d = 0.5, d _2R = 1−d = 0.5. (b) d _1R = d = 0.25, d _2R = 1−d = 0.75. (c) d _1R = d = 0.1, d _2R = 1−d = 0.9.