Interference Cancellation Scheme for Three-hop Cooperative Relay Networks

• Yinghua Zhang,
• Lei Wang,
• Jian Liu,
• Yunfeng Peng,

Vol. 13, No. 9, September 29, 2019
10.3837/tiis.2019.09.007, Download Paper (Free):

• Cognitive Radio Networks
• interference cancellation
• Power control
• secondary outage probability

Abstract

In this paper, we focus on interference cancellation for three-hop cognitive radio networks (CRNs) over Rayleigh fading channels. In CRNs, secondary users (SUs) are allowed to opportunistically utilize the licensed spectrum during the idle time of primary users (PUs) to achieve spectrum sharing. However, the SUs maybe power constrained to avoid interference and cover a very short transmission range. We here propose an interference cancellation scheme (ICS) for three-hop CRNs to prolong the transmission range of SUs and improve their transmission efficiency. In the proposed scheme, a flexible transmission protocol is adopted to cancel the interference at both secondary relays and destinations at the same time. And a closed-form expression for the secondary outage probability over Rayleigh fading channels is derived to measure the system performance. Simulation results show that the proposed scheme can significantly reduce the secondary outage probability and increase the secondary diversity in comparison with the traditional cases.

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