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Technical Paper Presentation on
Presented by:Shreedhar Subhas Electronics and Communication EngineeringDate:12-09-2015
Reconfigurable Filtennas and MIMO in Cognitive Radio Applications
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What is cognitive Radio?
Cognitive Radios(CRs) intelligent System which Allows the unlicensed users to access the unutilized part of licensed bands with a specific time and locations.
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$$$$$$
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The main purpose of adopting cognitive radio technology is to improve the spectrum usage efficiency.
Cognitive Radio(CR) System Allows the unlicensed users to dynamically access the “under-utilized" licensed bands.
The huge development of personal wireless technologies like - Wi-Fi, Bluetooth, digital phones, and so on which operate on unlicensed band.
Why cognitive Radio..??
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What is Reconfigurable Filtennas?
Filtennas = Filter + Antennas
Reconfigurable : reconfigurable antennas is used to maximize the antenna performance in a changing scenario or to satisfy changing operating requirements.
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Working:
A cognitive radio system learns from previous experiences and channel activity and adapts itself based on this information.
Principle :
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MIMO (Multiple Input Multiple Output)
Provide increased link capacity and spectral efficiency combined with improved links.
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Underlay cognitive Radio System
(a)Top layer (b)Bottom layer[all dimensions in mm ]
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(a) the top layer (b) the bottom layer with the integrated switches.
Fabricated underlay cognitive radio antenna
(a) (b)
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f [G Hz] Total Efficiency
S1/s2 OFF 3.93 65%
S1/s2 ON 4.35 74%
S1 ON 4.08 63%
VALUES FOR THE RECONFIGURABLE FILTENNA
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f [Ghz] Total Efficiency
S1/s2 OFF 3.93 65%
S1/s2 ON 4.35 74%S1 ON 4.08 63%
VALUES FOR THE RECONFIGURABLE FILTENNA
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Typical Cognitive Radio Applications
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Implemntation Issues:Complexity in Sensing
algorithms designSecurityShort range communication
with power level restriction
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CONCLUSION
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REFERENCES[1] S. K. Jayaweera and C. G. Christodoulou, “Radiobots: Architecture,Algorithms and Real-Time Reconfigurable Antenna Designsfor Autonomous, Self-Learning Future Cognitive Radios,”Univ. New Mexico, Tech. Re. [Online]. Available: http://repository.unm.edu/handle/1928/12306
[2] S. Haykin, “Cognitive radio: Brain-empowered wireless communications,”IEEE J. Sel. Areas Commun., vol. 23, pp. 201–220, 2005.
[3] Y. Tawk and C. G. Christodoulou, “A new reconfigurable antenna designfor cognitive radio,” IEEE Antennas Wireless Propag. Lett., vol.8, pp. 1378–1381, 2009.
[4] Y. Tawk, M. Bkassiny, G. El-Howayek, S. K. Jayaweera,K.Avery, andC. G. Christodoulou, “Reconfigurable front-end antennas for cognitiveradio applications,” IET, Microwaves, Antennas Propag., vol. 5, no. 8,pp. 985–992, Jun. 2011.
[5] A. Grau, J. Romeu, M. Lee, S. Blanch, L. Jofre, and F. De Flaviis, “Adual linearly polarized MEMS-reconfigurable antenna for narrowbandMIMO communication systems,” IEEE Trans.
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THANK YOU