Abstract
Simultaneous wireless information and energy transfer based on radio frequency (RF) energy harvesting can transmit power and information at the same time and can use the same wireless signal to decode the information and to charge the battery. In order to improve spectrum efficiency of energy-constrained networks, we consider combining cooperative relay with simultaneous information and energy transfer in this paper. The optimal relay power allocation and relay selection algorithms based on statistical channel state information (CSI) and perfect CSI are proposed, respectively. Specifically, the system first selects the relay nodes that can correctly decode the source information and, then among them, selects the node with the best second hop channel condition. We derive the exact analytical outage probability of the proposed algorithms by using order statistical tool. The analytical results are compared and verified by Monte Carlo simulations. It is observed that the outage probabilities of our proposed algorithms based on statistical CSI and perfect CSI are all lower than that of the corresponding traditional max–min algorithms.
Highlights
The generation wireless network represented by 5G is expected to greatly increase wireless data rates, bandwidth, coverage, and connectivity, with a massive reduction in round trip latency and energy consumption
We propose an optimal relay selection strategy based on dynamic power allocation as well as statistical and perfect channel state information (CSI)
Two relay selection algorithms including statistical channel state information-based methods and perfect channel state information-based methods are compared with the max–min algorithm with respect to outage probability performance
Summary
The generation wireless network represented by 5G is expected to greatly increase wireless data rates, bandwidth, coverage, and connectivity, with a massive reduction in round trip latency and energy consumption. The power-constrained cooperative relay can be complemented by the radio frequency energy harvesting technology (RF-FH), which stimulates a new round of academic research and leads to a new revolution in wireless network technology [3]. It should be noted that energy harvesting requires −10 dBm power sensitivity, while information decoding requires as lower as −60 dBm [8]. The structures where SWIPT can adopt includes [9] time switching, power splitting, antenna switching, and integrated information-decoding and energy-harvesting. Introducing SWIPT into CoR can solve the problem of limited energy of relay nodes, thereby providing higher energy efficiency (EE) and spectrum efficiency (SE) for generation wireless networks
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