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We propose a Disruption Aware Routing and link Scheduling (DARS) scheme for multi-hop cognitive radio networks. The objective is to minimize disruptions to secondary user communication sessions due to channel switching and the resource consumption. We formulate the problem into an optimization problem and develop an efficient algorithm to solve the problem. The main idea is to monitor the data rate...
Massive Multiple Input Multiple Output (MIMO) system is regarded as an emerging technology to enhance the capacity (achievable rate) of wireless communication systems. In this paper, we present an iterative algorithm that adapts transmit signal vector and power of the user using game theory to enhance the physical-layer security (achievable secrecy rate) of massive MIMO system in the presence of eavesdropper...
Cognitive radio network is regarded as an emerging technology to solve 'spectrum scarcity' through dynamic spectrum access to support exponentially increasing wireless subscriptions. However, spectrum sensing and dynamic spectrum sharing in cognitive radio network invite more security attacks making security as one of the main concerns. In this paper, we analyze the performance of the secondary users...
In this paper, we address the challenge of providing secondary users access to licensed spectrum when there are active primary user transmissions. The motivation is to eliminate the disruption to secondary user communications by the resurgence of primary user transmissions. We propose a novel protocol, termed spectrum co-access protocol (SCAP), for secondary users to transparently and simultaneously...
The IEEE 802.22 cognitive Wireless Regional Area Networks (WRAN) uses cognitive radio technique to allow Secondary Users (SUs) to opportunistically share the TV bands with TV broadcast service on a non-interfering basis and hence improve the spectrum utilization. WRAN employs Orthogonal Frequency Division Multiplexing (OFDM) technology for transmission and thus is sensitive to inter-carrier interference...
Dynamic spectrum access is a new spectrum sharing paradigm that allows secondary users to access the abundant spectrum holes or white spaces in the licensed spectrum bands. DSA is a promising technology to alleviate the spectrum scarcity problem and increase spectrum utilization. While DSA has attracted many research efforts recently, in this article, we discuss the challenges of DSA and aim to shed...
Covert channel is used to secretly transfer information. In covert timing channels, all messages are decoded based on the arrival time of packets at the receiver side. In covert communications, synchronization between the sender and receiver plays a key role in decoding accuracy. Lost, duplicated, and out-of-order arrived packets may cause the loss of synchronization between the sender and receiver...
Wireless mesh networks (WMNs) have recently emerged as a promising broadband access infrastructure for next-generation wireless networking. Several approaches that exploit directional antennas have been proposed in the literature to increase the performance of WMNs. In this paper, we study the interference optimization multicast problem in WMNs where nodes are equipped with directional antennas. Interference...
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