A new transmission mechanism called direct and relay-aided transmissions based on inter group cooperation was proposed for the cognitive radio network. The performance of a single-relay system based on amplify-forward in the Rayleigh fading environment by considering the interference constraints and peak power constraints was analyzed. The impact of the relay node and the primary user... https://safeersappliancers.shop/product-category/neff-d85ibe1s0b-chimney-cooker-hood-a-energy-rating-black/