Simulation And Application Of Cognitive Networks Based On Energy Harvesting Technology

The cognitive relay networks have many advantages,such as expanding signal coverage,reducing network communication interference,and using high frequency spectrum resources.However,regarding an energy constraint networks,once the relay node's energy is exhausted,the communication of information above it is terminated.So as to resolve the phenomenon of limited energy in the network,energy harvesting technology has emerged as a new technology that effectively extends the lifespan of wireless communication networks.Considering the Nakagami-m fading environment,this paper mainly studies the cognitive relay network based on energy harvesting(EH)and obtains some research results.First,for a single-antenna decode and forward(DF)relay network,consider that relay nodes use power splitting(PS)in energy harvesting technology to collect energy,and the transmit power of the cognitive transmitter S and cognitive relay R are limited by their maximum transmission power and the maximum interference power that can be stood by the primary user.The cognitive DF network not only improves the utilization rate of communication spectrum,expands the communication range,but also increases the time of use of the equipment and reduces the economic cost.We use math skills such as the binomial expansion,and obtain the expression of the outage probability under the Nakagami-m fading environment.The results obtained are matched with the Monte Carlo simulation curve,which verifies the authenticity of the analysis results.This research result can guide the structural design and performance optimization of the cognitive relay networks under the Nakagami-m fading environment.Secondly,based on the previous research,we analyzed the reliability of transmission of cognitive incremental DF(IDF)relay networks.Considering that there is a direct transmission link between the cognitive transmitter and the receiver.When the direct link communication quality is good,the transmitter communicates the signal to the receiver diametrically;otherwise,the transmitter forwards the signal to the receiver through an EH relay node,to ensure good communication quality.We obtain an accurate outage probability expression for this network under the IDF protocol.The match between the analytical value and the simulated value verifies the authenticity of the theory.The final conclusions provide an accurate and reliable communication scheme for cognitive relay networks.Finally,for the outage performance of cognitive relay networks under multi-relay and multi-primary users,we study the network outage probability performance under two energy harvesting protocols.Among them,the first one is the power splitting protocol(PS).The relay divides the received energy into two parts:one part is used to convert into its own energy,and the other part is used to process the received signal.The second is time switching(TS).The relay acquires the energy of the received signal for a short period of time and retrieves the information from the received signal during the rest of the time.This part of the study provides a good theoretical basis for the optimization and design of cognitive multi-relay energy acquisition networks.