| Popis: |
Aiming at the problem of secondary user energy restriction in cognitive radio Ad Hoc networks, a opportunistic spectrum access strategy based on energy efficiency is proposed. Considering both the time-varying channel state and the accuracy of secondary user spectrum perception, an analysis framework to maximize energy efficiency is established based on partially observable Markov decision-making process, which guides secondary users to select the most energy-efficient channel, and adaptively controls transmission power according to belief state, channel gain and detection probability. The simulation results show that this strategy can improve the energy efficiency of secondary user transmission, and achieve an effective compromise between transmission rate and energy overhead by effectively controlling transmission power. |
