Journal ArticleDOI
Dynamic resource allocation using load estimation in distributed cognitive radio systems
TLDR
An impressive design of a low complexity and high efficiency dynamic spectrum access technique for cognitive radio networks that does not require central controllers nor the pre-establishment and maintenance of common control channels, yet can provide throughput and fairness levels that approach the performance of centralized systems.Abstract:
Cognitive radio is an emerging wireless technology that is envisaged as a solution to the spectrum scarcity issue. To improve spectrum utilization, cognitive (unlicensed) wireless users are assigned an opportunistic access to vacant channels on the condition they avoid interference with primary (licensed) users. In this paper we present an impressive design of a low complexity and high efficiency dynamic spectrum access technique for cognitive radio networks. This spectrum assignment algorithm does not require central controllers nor the pre-establishment and maintenance of common control channels. Yet, it can provide throughput and fairness levels that approach the performance of centralized systems. In addition, the proposed technique reacts extremely well to disturbances in the cognitive radio network configuration, including when primary users are activated, or when newcomer cognitive users join the network. Furthermore, we present in this work an analytical model that can be used to provide quick predictions of the performance of our proposed algorithm.read more
Citations
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Journal ArticleDOI
EA-CRP: A Novel Energy-aware Clustering and Routing Protocol in Wireless Sensor Networks
TL;DR: Experimental results show that EA-CRP has superior performance in term of network lifetime, energy efficiency, and scalability.
Journal ArticleDOI
Improved clustering algorithms for target tracking in wireless sensor networks
TL;DR: Two algorithms to enhance the adaptive-head clustering algorithm are proposed, namely, the improved adaptive- head and improved prediction-based adaptive head, which uses dynamic clustering to achieve impressive tracking quality and energy efficiency through optimally choosing the cluster head that participates in the tracking process.
Journal ArticleDOI
C-DTB-CHR: centralized density- and threshold-based cluster head replacement protocols for wireless sensor networks
TL;DR: Two protocols to cluster a WSN through taking advantage of the shortcomings of LEACH, T-LEACH, and MT-CHR are proposed, namely centralized density- and threshold-based cluster head replacement (C-D TB-CHR) and C-DTB-CHR with adaptive data distribution (C -DTB -CHR-ADD) protocols.
Journal ArticleDOI
MT-CHR: A modified threshold-based cluster head replacement protocol for wireless sensor networks
TL;DR: In the MT-CHR protocol, a new probability of being a cluster head, for any node in any round, has been proposed which agrees fairly with the assumptions introduced in LEACH protocol and a new expression for threshold energy is proposed.
Journal ArticleDOI
A generic buffer occupancy expression for stop-and-wait hybrid automatic repeat request protocol over unstable channels
TL;DR: This paper proposes a new queuing study over networking systems that make use of sequential decoders that is totally generic and parameterized by not only channel condition and packet incoming rate, but also those that are automatically adapted to the channel conditions which include lower and upper bound decoding limits.
References
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Journal ArticleDOI
Game Theoretic Approaches for Multiple Access in Wireless Networks: A Survey
TL;DR: This survey provides a comprehensive review of the game models developed for different multiple access schemes (i.e., contention-free and contention-based random channel access) in wireless networks and outlines several of the key open research directions.
Journal ArticleDOI
Decision-Theoretic Distributed Channel Selection for Opportunistic Spectrum Access: Strategies, Challenges and Solutions
TL;DR: This article analyzes the challenges facing OSA systems globally, which mainly include interactions among multiple users, dynamic spectrum opportunity, tradeoff between sequential sensing cost and expected reward, and tradeoffs between exploitation and exploration in the absence of prior statistical information.
Journal ArticleDOI
Developing a standard for TV white space coexistence: technical challenges and solution approaches
Tuncer Baykas,Mika Kasslin,Mark Cummings,Hyunduk Kang,Joe Kwak,R. Paine,Alexander Reznik,Rashid A. Saeed,Stephen J. Shellhammer +8 more
TL;DR: A detailed overview of the regulatory status of TVWS in the United States and Europe is provided, the coexistence problem in TVWS is analyzed, and existing coexisting mechanisms to improve coexistence are summarized.
Journal ArticleDOI
Optimization for Centralized and Decentralized Cognitive Radio Networks
TL;DR: This paper proposes a novel optimization algorithm whose solution is guaranteed to be exactly optimal for networks with centralized management and networks with decentralized management, using the distributed energy minimization dynamics of the Hopfield-Tank neural network.
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