Fig. 2
From: LLR-based coded performance analysis of cognitive dual-hop BICM systems
Throughputs and BICM capacities of a two-hop cognitive relay channel as a function of \(\mathbf {\overline {\gamma }_{\text {sd}}}\), for different ratios δ p = d rp / d rd and fixed relay position δ r = 0 . 5. For different ratios δ p =d rp/d rd, lines correspond to the analytical results, filled markers correspond to simulation results obtained using the exact L-values, and hollow markers correspond to simulation results obtained using the max-log approximation of L values ([9], Eq. (8)). The capacity of the conventional two-hop source-relay-destination link is shown as a reference (dashed line)