The document presents information on smart antennas for mobile communication. It discusses previous drawbacks like multipath fading, co-channel interference, and Doppler effects that smart antennas aim to overcome. Smart antennas estimate the direction of arrival of signals using techniques like MUSIC algorithms. They employ beamforming using adaptive antenna arrays to create customized radiation patterns for each user while minimizing interference. The document covers the history of smart antennas, describes switched beam and adaptive array systems, and lists applications and advantages and the future scope of smart antenna technology.

1. Presented By:-
Quraishi M Shoeb Alimuddin
ELCTRONIC & TELECOMMUNICATION
ENGINEERING
AIKTC School Of Engineering
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2. PREVIOUS DRAW BACKS
• Current & future demands in mobile communication
for various high speed multimedia data services entail
a robust,high data rate transmission system.
• Some problems likeMultipath Fading,
Co-channel interference
Doppler effects
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3. OBJECTIVE
• To overcome the above all problem SMART
ANTENNAS are used for Mobile Communication.
• Some techniques are used in smart antenna design
• The smart antenna system estimates the direction of
arrival of the signal.
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4. HISTORY
• The Smart antenna was developed for “Military Communications” &
“Intelligence gathering”.
• The Growth of Cellular Telephone in The year 1980 attracted interest in
Commercial Applications.
• The Mobile Phone Indoor Wireless & Satellite Broadcasting Industries
Created New Opportunities for Smart Antenna in the 1990s.
• Array Communication in the 1992.
• Designed to increased the capacity of Wireless employing Time Division
Duplex(TDD).
• 12/02/2014
Development of 4G MIMO
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5. INTRODUCTION
• Antenna is electrical device which converted electric power into
Electromagnetic waves or vice versa.
• A Smart Antenna consist of an antenna array, that changes the
array pattern in response to signal Environment to improve the
performance of a Communication System.
• Smart Antenna is not smart,it is the digital signal processing, along
with the antennas,which makes the system smart.
• Smart Antenna System are basically an extension of cell sectoring
in which the sector coverage is composed of multiple beams.
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6. WHAT IS DOA ESTIMATION ?
• It is direction of arrival.
• The smart antenna estimates the direction of arrival of the
signal,using technique such as MUSIC (multiple signal
classification) estimation of signal parmeters via rotational
invariance techniques (ESPRIT) algorithms,Matrix Pencil
method or one of their derivatives.
• They involve finding a spatial spectrum of the antenna/sensor
array, and calculating the DOA from the peaks of this spectrum
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7. BEAMFORMING
• Used to create the
radiation pattern of the
antenna array
• FIR tapped delay line
filter
• The weights of the FIR
filter may also be changed
adaptively, and used to
provide optimal
beamforming.
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8. TYPES OF SMART ANTENNA
Smart Antenna System are of two types:
* Switched Beam Antenna System.
*Adaptive Array Antenna System.
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9. SWITCHED BEAM ANTENNA SYSTEM
It is an extension of Cell Sectoring as
each sector is subdivided into smaller
sectors.
The switched beam System detects
the signal strength & continually
switches the beam as necessary.
The overall goal of the switched
beam system is to increase the gain
according to the location of the user.
If there is an interfere near the center
of the active beam,it may be enhanced
more then the desired user.
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10. ADAPTIVE ARRAY ANTENNA SYSTEM
>Adaptive array systems can customize
an appropriate radiation pattern for each
individual user.
>Adaptive array system can locate and
track signals(users and interferers).
>This provides optimal gain while
simultaneously identifying,tracking and
minimizing interfering signals.
>It can customize an appropriate
radiation pattern for each individual user.
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11. APPLICATION
•
•
•
•
•
•
MOBILE COMMUNICATION
CELLULAR & WIRELESS NETWORK
SATELLITE COMMUNICATION
WIRELESS SENSOR NETWORK
MILITARY
ELECTRONIC WARFARE(EWF)
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12. ADVANTAGES
•
•
•
•
•
•
•
Capacity.
Bit rate.
Coverage.
Efficiency.
Security.
Mobility&Compatibility.
Quality.
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13. FUTURE SCOPE
• In mobile handsets to achieve much better
performance
• 4G system with 1Gbit/s data rate and freq 20-100mhz
• Detect malignant tumors.
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14. CONCLUSION
• Smart Antenna are the intelligent antenna systems that
improve the efficiency of Wireless transmission.
• Promising technology to resolve the traffic capacity
• Efficient utilization of the scarcest resource of today’s
wireless comm.the RF spectrum.
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15. THANK YOU
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