Journal ArticleDOI
IEEE Standards Supporting Cognitive Radio and Networks, Dynamic Spectrum Access, and Coexistence
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TLDR
A review of standardization activities for cognitive radio technologies and comments on prospects and issues for future standardization are provided.Abstract:
Cognitive radio techniques are being applied to many different communications systems. They hold promise for increasing utilization of radio frequencies that are underutilized today, allowing for improved commercial data services, and allowing for new emergency and military communications services. For example, these techniques are being considered by the U.S. FCC for communications services in unlicensed VHF and UHF TV bands. Although traditionally these techniques are closely associated with software-defined radios, many standards such as WiFi (IEEE 802.11), Zigbee (IEEE 802.15.4), and WiMAX (IEEE 802.16) already include some degree of CR technology today. Further advances are occurring rapidly. IEEE 802.22 will be the first cognitive radio-based international standard with tangible frequency bands for its operation. Standardization is at the core of the current and future success of cognitive radio. Industry stakeholders are participating in international standards activities governing the use of cognitive radio techniques for dynamic spectrum access and coexistence, next-generation radio and spectrum management, and interoperability in infrastructure-less wireless networks. This article provides a review of standardization activities for cognitive radio technologies and comments on prospects and issues for future standardization.read more
Citations
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Journal ArticleDOI
MAC-Layer Packet Loss Models for Wi-Fi Networks: A Survey
TL;DR: An overview of the causes of packet loss and a comprehensive survey of the available models for packet loss in Wi-Fi networks are provided to help researchers understand the most important characteristics of the packet loss process inWi-fi networks and the strengths and weaknesses of the main packet loss models.
Journal ArticleDOI
Polyphase analysis filter bank down-converts unequal channel bandwidths with arbitrary center frequencies
TL;DR: This paper presents an efficient structure, based on polyphase filter banks, for CR receivers, a variant of the standard M-path polyphase down converter channelizer that is able to perform M/2-to-1 down sampling of the input time series.
Journal IssueDOI
Cooperative spectrum sensing with imperfect feedback channel in the cognitive radio systems
Dong-Chan Oh,Yong-Hwan Lee +1 more
TL;DR: A hard decision combining-based cooperative spectrum sensing scheme in the presence of a feedback error caused by imperfect channel condition is proposed, which can maximize the detection probability while guaranteeing that the desired false alarm probability is maintained.
Proceedings ArticleDOI
A cognitive based spectrum sharing scheme for LTE advanced systems
TL;DR: In LTE-Advanced system, spectrum scarcity is an inevitable issue due to wider bandwidth requirement for downlink peak throughput up to 1Gbps, so spectrum sharing methods for LTE- advanced system are not optimal enough.
Journal ArticleDOI
Resource Allocation in Cognitive Radio Relay Networks
Jui-Chi Liang,Jyh-Cheng Chen +1 more
TL;DR: This work proves that the problem of proportional fair scheduling in cognitive radio relay networks is NP-hard and is computationally infeasible to be solved in a timely manner by using brute force algorithms, and proposes two heuristic algorithms that can meet the requirement of real-time scheduling.
References
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Journal ArticleDOI
Cognitive radio: making software radios more personal
TL;DR: With RKRL, cognitive radio agents may actively manipulate the protocol stack to adapt known etiquettes to better satisfy the user's needs and transforms radio nodes from blind executors of predefined protocols to radio-domain-aware intelligent agents that search out ways to deliver the services the user wants even if that user does not know how to obtain them.
Journal ArticleDOI
Cognitive functionality in next generation wireless networks: standardization efforts
TL;DR: This article discusses recent standardization efforts related to cognitive radio focusing on the work of IEEE Standards Coordinating Committee 41, formerly known as IEEE 1900, and some important tasks to be performed by the CR standardization community.
Journal ArticleDOI
Recent advances in cognitive communications
Apurva N. Mody,Stephen R. Blatt,Diane G. Mills,Thomas P. McElwain,Ned B. Thammakhoune,Joshua D. Niedzwiecki,Mathew Sherman,Cory S. Myers,Paul D. Fiore +8 more
TL;DR: This article describes recent advances in cognitive communications, which combines the concepts of signal processing, communications, pattern classification, and machine learning to make dynamic use of the spectrum, such that the emanated signals do not interfere with the existing ones.