1. Smart Antenna Rashmikanta Dash Regd.no:0601209202 ETC-A-52

2. OUTLINE Introduction What is Smart Antenna ? Why Smart Antenna ?
How Smart Antenna works ?
ULA
UCA
Conclusion

3. Introduction Rapid growth of wireless communication
Multi-services requirement
Effective usage of frequency band
Classic antennas are omni-directional
smart antenna

4. What is Smart Antenna ? Concept of SDMA system
Arrange in a particular geometric form
Use few methods to change EM wave pattern
Switched beam system
Adaptive antenna system

5. Switched beam system
。select one of several beams to enhance received signals

6. Adaptive antenna system
。adaptive beam system can adjust its antenna pattern to enhance the desired signal
。null or reduce interference
。collect correlated multipath power

7. Why Smart Antenna Higher capacity (traffic/area)
Better transmission quality and/or coverage
Higher capacity (traffic/area)
Spectrum is expensive therefore of great interest to operators
Better transmission quality and/or coverage
Energy better focussed on user (greater C/I) or greater coverage
Co-channel interference suppression
Dynamic cell coverage

8. Why Smart Antenna Reduction of transmitter power
Reduction of delay spread
Accurate user position estimation
Reduction of transmitter power
Reduction of delay spread
Tuning of the channel for desired delay profile characteristics
Accurate user position estimation
Requirement for new standards
Fixed cell shape
Dynamic cell shape

9. Limiting effects of the wireless channel
Multi-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

10. Multi-path propagation
Multipath components suffer different delays
This 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

11. 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 MP
Mobile 1
Interference

12. How Smart Antenna works
Uniform Linear Array geometry
Uniform Circular Array geometry

13. Uniform Linear Array geometry

14. Base-band signal

15. Uniform Circular Array geometry

18. Conclusion
Smart Antenna offer new ways to combat and/or exploit the spatial channel
Smart Antennas reduce co-channel interference, improve BER performance and hence capacity

19. THANK YOU……………..