smart antenna (1)
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The document contains ppt on Smart Antennatechnology with suficient info.TRANSCRIPT
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Smart AntennaSmart AntennaRashmikanta DashRashmikanta DashRegd.no:0601209202Regd.no:0601209202ETC-A-52ETC-A-52
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OUTLINEOUTLINEIntroductionWhat is Smart Antenna ?Why Smart Antenna ?How Smart Antenna works ?
◦ULA◦UCA
Conclusion
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IntroductionIntroductionRapid growth of wireless
communicationMulti-services requirementEffective usage of frequency bandClassic antennas are omni-directional
smart antenna
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What is Smart Antenna ?What is Smart Antenna ?
Concept of SDMA systemArrange in a particular geometric formUse few methods to change EM wave pattern
◦ Switched beam system◦ Adaptive antenna system
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Switched beam systemSwitched beam system
。 select one of several beams to enhance received signals
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Adaptive antenna Adaptive antenna systemsystem
。 adaptive beam system can adjust its antenna pattern to enhance the desired signal
。 null or reduce interference
。 collect correlated multipath power
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Why Smart AntennaWhy Smart Antenna
Higher capacity (traffic/area)Better transmission quality and/or
coverage
Standard Coverage
Extended Coverage
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Why Smart AntennaWhy Smart Antenna
Reduction of transmitter powerReduction of delay spreadAccurate user position estimation
Fixed cell shape Dynamic cell shape
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Limiting effects of the wireless channelMulti-path propagation gives rise to
fading inter-symbol interference time variation of signals
Co-channel interference gives rise to increased noise level and hence greater
errors
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Multi-path propagationMultipath components
suffer different delaysThis gives rise to ISI reject or stimulate
multipath components by changing their radiation patterns
significantly reduce the requirements of equalization and/or increase CINR
Mobile
Smart Antenna
LoS
MP
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Co-channel interference
Interference from other directions than wanted user
suppress unwanted user by placing nulls in directions of unwanted signals
improved transmission quality and/or system capacity
Mobile 2
Smart Antenna
LoS
MPMobile 1
Interference
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How Smart Antenna worksHow Smart Antenna works
Uniform Linear Array geometryUniform Circular Array geometry
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UUniformniform L Linearinear A Arrayrray geometrygeometry
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cos ( 1) cos( ) ( ) 1 .....Tjkd j L kd
ULAa g e e
( 1) 0T
lr l d
1
( ) ( ) ( )M
m mm
t s t
x aBase-band signal
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UUniformniform C Circularircular A Arrayrray geometrygeometry
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2 ( 1) 2 ( 1)cos sin
T
l
l lR
L L
r
(0, ) (1, ) ( 1, )( ) ( ) .....Tj j j L
UCAa g e e e
2 ( 1) 2 ( 1)( , ) cos cos sin sin
l ll kR
L L
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1( ) ( )....... ( )T
Mt s t s ts
( ) ( ) ( ) ( )t t t X A s n
1( ) ( .... ( ) ( )M L x M A a a
1
( ) ( ) ( )M
m mm
t t
x a s
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ConclusionConclusionSmart Antenna offer new ways to
combat and/or exploit the spatial channel
Smart Antennas reduce co-channel interference, improve BER performance and hence capacity
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THANK YOU……………..THANK YOU……………..