Impact of primary networks on the performance of energy harvesting cognitive radio networks

Abstract

In this paper, we investigate the effect of of the primary network on the secondary network when harvesting energy in cognitive radio in the presence of multiple power beacons and multiple secondary transmitters. In particular, the influence of the primary transmitter's transmit power on the energy harvesting secondary network is examined by studying two scenarios of primary transmitter's location, i.e., the primary transmitter's location is near to the secondary network, where the primary transmitter can interfere the secondary receiver, and the primary transmitter's location is far from the secondary network, where the secondary receiver is free from the interference. In addition, the peak interference constraint at the primary receiver is also considered. In the scenario where the primary transmitter locates near to the secondary network, although secondary transmitter can be benefit from the harvested energy from the primary transmitter, the interference caused by the primary transmitter suppresses the secondary network performance. Meanwhile, in both scenarios, despite the fact that the transmit power of the secondary transmitter can be improved by the support of powerful power beacons, the peak interference constraint at the primary receiver limits this advantage. In addition, the deployment of multiple power beacons and multiple secondary transmitters can improve the performance of the secondary network. The analytical expressions of the outage probability of the secondary network in the two scenarios are also provided and verified by numerical simulations.

Outage Probability Analysis in Power-Beacon Assisted Energy Harvesting Cognitive Relay Wireless Networks

“…Without loss of generality, we assume that the coordinates of the SS, SR, SD, and PR nodes in the -plane are (0, 0), (1, 4), (7,10), and (8, 2), respectively. For Scenario 1, the PBs are located at (0, 2), (5, 3), and (−1, 2).…”

“…To overcome this disadvantage, the authors in [4] proposed a novel wireless-powered system architecture in which power-beacons (PBs) are deployed to power wireless devices. Several PB-assisted energy harvesting systems have been then proposed and investigated in the literature; see, for example, [5][6][7][8][9][10].…”

Wireless powered underlay cognitive radio network with multiple primary transceivers: Energy constraint, node arrangement, and performance analysis

“…[10][11][12][13][14][15][16] The authors in Wang et al 10 derived the OP of a nonrelay-assisted SNet, which shares the spectrum of the primary network (PNet) and harvests energy while assisting primary transmission, and hence the secondary users (SUs) can harvest sufficient wireless energy to process the information in their network. [10][11][12][13][14][15][16] The authors in Wang et al 10 derived the OP of a nonrelay-assisted SNet, which shares the spectrum of the primary network (PNet) and harvests energy while assisting primary transmission, and hence the secondary users (SUs) can harvest sufficient wireless energy to process the information in their network.…”

“…Recently, due to the benefits of EH and CRNs, many works have focused on novel models to improve the system performance as in literature. [10][11][12][13][14][15][16] The authors in Wang et al 10 derived the OP of a nonrelay-assisted SNet, which shares the spectrum of the primary network (PNet) and harvests energy while assisting primary transmission, and hence the secondary users (SUs) can harvest sufficient wireless energy to process the information in their network. In Yang et al, 11 the authors considered underlay CRNs with one secondary transmitter-receiver pair, one EH secondary relay, and the presence of one primary receiver.…”

“…As can be seen the investigation in Park and Hong, 13 they aim to analyze the theoretically achievable throughput of the wireless energy constraint secondary transmitter, while opportunistically accessing the shared spectrum of the PNet. Regarding EH in cognitive radio where the presence of multiple antenna in power beacons powered by multiple secondary transmitters, the authors in Zhang et al 14 examined the SNet performance under the effect of the primary transmitter's location as well as changing the number of power beacons.…”