Fig. 4
From: LLR-based coded performance analysis of cognitive dual-hop BICM systems
BER of a two-hop cognitive relay channel as a function of \(\mathbf {\overline {\gamma }_{\text {sd}}}\) using a convolutional coding scheme. For different ratios δ p =d rp/d rd and I/P, lines correspond to the analytical results, hollow markers correspond to simulation results. The BER of the conventional two-hop source-relay-destination link is shown as a reference (dashed line)