Journal ArticleDOI
Cognitive Mesh Network Under Interference from Primary User
TLDR
A simple antenna pattern switching where each cognitive node is equipped with three antennas, and tries to select the antenna configuration constituting 2-element linear array with the best antenna pattern for each link, which can reduce the hardware complexity.Abstract:
In a commonly accepted usage scenario, a cognitive radio appears as a secondary user of certain spectrum which is licensed to another, primary system. A prominent example of cognitive system is a mesh network operating under the interference from primary system. For such a scenario, we propose techniques for efficient secondary usage of spectrum, which rely on the adaptive array antenna in order to reduce the interference between the primary and the cognitive system. In order to keep the hardware complexity as small as possible, the number of antennas at each cognitive node should be small. However, with the simplest 2-element linear adaptive array, the created antenna pattern can result in non-optimized pattern between cognitive nodes in the mesh network. In order to solve such a problem, this paper introduces a simple antenna pattern switching where each cognitive node is equipped with three antennas, and tries to select the antenna configuration constituting 2-element linear array with the best antenna pattern for each link. The proposed configuration requires three antennas but only two transceiver chains, which can reduce the hardware complexity. We also introduce 3-element linear array and design a simple procedure to heuristically select the pattern. Our numerical results show that the proposed techniques can significantly increase the available bandwidth and networking connectivity with small complexity when a cognitive mesh network is located inside the communication area of the primary system.read more
Citations
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Journal ArticleDOI
A geometric approach to improve spectrum efficiency for cognitive relay networks
Min Xie,Wei Zhang,Kai-Kit Wong +2 more
TL;DR: The use of relaying is investigated to enhance the spectrum utilization of an idealized two-dimensional geometric network in Rayleigh fading channels and the benefits of concurrency, in which more than one CUs are allowed to transmit at the same time to improve the end-to-end (e2e) channel utilization are studied.
Journal ArticleDOI
Interference Aware Routing Game for Cognitive Radio Multi-Hop Networks
TL;DR: A distributed dynamic routing algorithm in multi-hop cognitive radio (CR) networks, in which secondary users (SUs) want to minimize their interference to the primary users (PUs) while keeping the delay along the route low, is introduced.
Journal ArticleDOI
Routing-Toward-Primary-User Attack and Belief Propagation-Based Defense in Cognitive Radio Networks
TL;DR: This paper proposes a new and powerful network layer attack, routing-toward-primary-user (RPU) attack in CR networks and develops a defense strategy using belief propagation to defend against this attack.
Proceedings ArticleDOI
Underlay MIMO Cognitive Radio Downlink Scheduling with Multiple Primary Users and No CSI
TL;DR: This work proposed user selection strategies for downlink of multiple input and multiple output (MIMO) cognitive radio (CR) network with low computational complexity and best-effort interference mitigation to PUs.
Posted Content
Overlay Cognitive Radio in Wireless Mesh Networks
TL;DR: In this article, the authors apply the concept of overlay cognitive radio to the communication between nodes in a wireless mesh network and analyze the cases of wireless mesh networks with regular and random topologies.
References
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Cognitive radio: brain-empowered wireless communications
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
Journal ArticleDOI
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Book
Introduction to Adaptive Arrays
TL;DR: This second edition is an extensive modernization of the bestselling introduction to the subject of adaptive array sensor systems, taking the reader by the hand and leading them through the maze of jargon that often surrounds this highly technical subject.
Proceedings ArticleDOI
Cognitive radio for flexible mobile multimedia communications
TL;DR: This paper characterizes the potential contributions of cognitive radio to spectrum pooling and outlines an initial framework for formal radio-etiquette protocols.
Journal ArticleDOI
Cognitive radio for flexible mobile multimedia communications
Joseph Mitola,Joseph Mitola +1 more
TL;DR: This paper characterizes the potential contributions of cognitive radio to spectrum pooling and outlines an initial framework for formal radio-etiquette protocols.