Dynamic spectrum access in cognitive radio networks with RF energy harvesting

摘要: Spectrum efficiency and energy are two critical issues in designing wireless networks. Through dynamic spectrum access, cognitive radios can improve the capacity of On other hand radio frequency (RF) harvesting has emerged as a promising technique to supply networks thereby increase their efficiency. Therefore, achieve both efficiencies, secondary users network (CRN) be equipped with RF capability, such referred an RF-powered network. In this article we provide overview CRNs discuss challenges that arise for access these Focusing on trade-off among sensing, data transmission, harvesting, then channel selection problem multi-channel CRN. CRN user adaptively select transmit when is not occupied by any primary user. Alternatively, harvest transmission if occupied. The optimal policy obtained formulating Markov decision process (MDP) problem. We present some numerical results solving MDP