Cognitive multihop networks in spectrum sharing environment with multiple licensed users

Abstract

Multihop network has been considered as a breakthrough frontier to enhance the coverage of wireless network. Spectrum-sharing is an efficient technique to enhance the utilization of the limited radio frequency bandwidth. In this paper, we therefore consider the extension of multihop network to cognitive radio networks with the spectrum sharing approach. In particular, we investigate the cognitive multihop networks in the presence of multiple licensed transmitters and receivers. Under the stringent power constraint imposed by the licensed users, we derive the closed-form and asymptotic expressions for the outage probability over Nakagami-m fading channels. The tractable closed-form expressions reveal the impact of important network parameters such as the fading severity parameters of the unlicensed network, the number of licensed users, the peak interference power imposed by the licensed receivers, the interference power from licensed transmitters. A significant observation corroborated by our study shows that the cognitive multihop networks benefit both cognitive radio and multihop networks for improving the coverage extension and frequency spectrum utilization.Index Terms-Multihop network cognitive relay network, Nakagami-m fading, outage probability, outage probability, peak interference power, coverage extension.

Joint Spatial-Temporal Access Scheme for Multihop Cognitive Relay Networks Over Nakagami-m Fading

“…The cooperative CRN contains N þ 1 CUs that communicate with each other on the same licensed spectrum shared from PUs. The multihop transmission path is determined by the protocol in the network layer, which results in the fixed relaying mode [15,18,19,25]. For each time end-to-end communication, only when every CU on the multihop path has participated in the communication can the multihop transmission be successful.…”

“…In [17], a comprehensive performance study of multihop CRNs with interference constraints from multiple PRs over Nakagami-m fading is provided, and outage probability, error rate and ergodic capacity are derived. In [18], in the presence of multiple PTs and PRs, the outage performance of multihop CRNs over Nakagami-m fading is investigated. Moreover, aiming at minimizing the outage probability of multihop CRNs, a joint power and channel allocation scheme is proposed in [19].…”

Underlay Cognitive Multihop MIMO Networks With and Without Receive Interference Cancellation

“…The outage probability of dual-hop amplify-and-forward (AF) in Rayleigh fading was examined in [11]. Moreover, the work in [12] investigated the impact of multiple PUs on the outage probability of dual-hop DF relaying, which was extended to multihop CRNs in [13]- [15].…”

“…• We treat a generalized model of that adopted in [13]- [15]. Specifically, MIMO AF multihop underlay CRNs is considered with the use of TAS/MRC per hop in the secondary network in the presence of multiple PUs and under the effect of Rayleigh fading.…”

Cognitive Multihop Wireless Sensor Networks over Nakagami-m Fading Channels

“…Furthermore, two-hop or multihop sensor (relaying) can help the secondary systems, for example, mobile ad hoc wireless networks and wireless sensor networks, in achieving broader coverage and better transmission performance. As the combination of cognitive radio and cooperative communications, cognitive dual-hop or multihop networks benefit from both the high spectrum utilization and the cooperative diversity, which have been intensively studied recently [4][5][6][7][8].…”