What About Spectrum Opportunities in ‘Angle’ Dimension for Dynamic Spectrum Access in Cognitive Radio Network context? A new Paradigm in Spectrum Sensing

The cognitive radio technology is the new paradigm to fulfill ever increasing need of bandwidth ultimately the radio spectrum by accommodating the radio spectrum dynamically to secondary users/unlicensed users without causing the interference. In cognitive radio, the spectrum opportunities have been...

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Bibliographic Details
Published in:	Wireless personal communications Vol. 76; no. 3; pp. 379 - 397
Main Authors:	Dhope, Tanuja Satish, Šimunić, Dina, Dhokariya, Nikhil Suresh, Pawar, Vishal Sanjay, Gupta, Bhawana
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Boston Springer US 01-06-2014 Springer
Subjects:	Access methods and protocols, osi model Algorithms Applied sciences Arrays Channels Cognitive radio Communications Engineering Computer Communication Networks Engineering Equipments and installations Exact sciences and technology Fading Mobile radiocommunication systems Networks Performance enhancement Radio Radiocommunications Signal,Image and Speech Processing Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Teleprocessing networks. Isdn Transmission and modulation (techniques and equipments) Transmitters. Receivers Time varying fading channel Dynamic spectrum access Adaptive thresholding Angle of Arrival Cognitive radio IEEE 802.11 af Rayleigh channel Time frequency domain method Threshold detection Adaptive method Time varying system Frequency band Channel estimation Bandwidth Radio spectrum Fault tolerant system Threshold Fading channels Meshed network Transmission protocol Rayleigh channels Spectral analysis Arrival angle Wireless network Software radio Signal to noise ratio
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Summary:	The cognitive radio technology is the new paradigm to fulfill ever increasing need of bandwidth ultimately the radio spectrum by accommodating the radio spectrum dynamically to secondary users/unlicensed users without causing the interference. In cognitive radio, the spectrum opportunities have been checked for Space, Time and frequency dimensions but ‘Angle’ dimension has not been explored till now. In this paper we have investigated accuracy of various ‘Angle-of-Arrival (AoA)’ estimation algorithms: ESPRIT, MUSIC, Bartlett, and Capon for opportunistic secondary users’ network under AWGN and time varying fading channels. The improvement in performance of these algorithms has been observed as array elements, signal-to-noise ratio and samples increases. An ‘adaptive thresholding’ technique has been proposed to improve the performance of AoA algorithms. Thus by estimating an ‘Angle-of- Arrival’ of licensed users, the unlicensed users can be accommodated in the same geographical area into the same channel in the same frequency band at the same time by directing unlicensed users’ beam in different direction than the direction of licensed users. Thereby improving spectrum utilization.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0929-6212 1572-834X
DOI:	10.1007/s11277-014-1712-4