smart antenna

1. Presented By:
S.Farhath Sujana

3.  Basic Definition Of Antenna.
 Omni directional and directional antennas.
Figure A:Omni directional antenna B. Directional antenna
coverage pattern coverage pattern

4.  In the field of wireless and mobile
communications in which capacity and
performance are usually limited by two major
impairments multipath fading and co-channel
interference.

5.  A smart antenna is actually combination of an antenna
array and dedicated signal processing algorithm,that
changes the array pattern in response to signal
environment to improve the performance of a
communication system.

6.  Smart Antenna’s work on the principle of
electronically steered antennas and adaptive
signal processing.
 In normal antenna we need to steer the antenna
manually to get the maximum gain in a
particular direction for the desired signal .
 Beam direction can be estimated using the
Direction-of-Arrival (DOA) estimation
methods .

10. Figure- Switched Beam System Coverage Patterns
(Sectors)
 It subdivides sector into many narrow beams, then each
beam is considered as individual sector serving user or
group of users.

11. Figure : Block diagram of Switched beam systems
PSN, which forms multiple beams looking in certain
directions. RF Switch actuates the right beam in the desired
direction.

12.  This provides optimal gain while simultaneously
identifying, tracking, and minimizing interfering signals.
Figure- Adaptive Array System Coverage Pattern

13.  D/C : Converts from RF to IF.
 ADC : Converts Analog to Digital for further processing.
 W’s : It contains amplification and phase information

14. CRITERIA SWITCHED BEAM ADAPTIVE ARRAYS
INTEGERATION • Easy to implement
• Low cost
• Transceiver complexity
• High cost
RANGE/COVERAGE • More coverage
compared to
conventional systems
• Less coverage compared
to adaptive array
• More coverage
compared to switched
beam system
INTERFERENCE
REJECTION
•Difficulty in
distinguishing
between desired signal
and interferer (no nulling)
• Capable of nulling
interfering signals
ALGORITHMS •No Complex algorithms •Complex algorithms
HAND-OFFS •Frequently,
•Have to be controlled.
•Less

15. Switched
beam array
Adaptive
array

16.  Among the most sophisticated utilizations of smart
antenna technology is SDMA.
 It employs advanced technique to, in effect, locate
and track fixed and mobile terminals, adaptively
steering transmission signal toward user and
interferers.
 Beams are sliced to keep different users in different
beams at the same frequency which allows reuse of
frequency.
 This technology achieves superior levels of
interference suppression and reduces RF pollution.

17. Figure: SDMA technology(general and actual mechanism)
This is the next step in an evolutionary path towards increasing
the capacity of cellular systems

18.  Reduce co-channel interference and multipath
fading.
 Fully controllable by software so less manual
operations.
 Reduction in transmitted power.
 Range extension.
 Provides High security.
 Improve system capacity.
 Reduction in Hand-Off.
 Compatibility.

20.  Cellular and wireless networks.
 Electronic warfare (EWF) as a countermeasure
to electronic jamming.
 Satellite systems.
 Acoustic signal processing.

21.  Smart antennas are the intelligent antenna systems
that vastly improve the efficiency of wireless
transmission.
 SAS can achieve high transmission data rate and
coverage area by effectively reducing multipath and co
channel interference.
 Smart antenna systems are software-controllable,
remotely configurable.


22. [1].R. H .Roy, “An overview of smart antenna technology
and its application on wireless communication
systems,” Proc .IEEE conf .personal wireless
comm.,2007, pp. 234 – 238
[2].Chryssomallis, M., 2008. Smart antennas , IEEE
Antennas and Propagation Magazine, 42(3): 129 -136
[3].S. F. Shaukat , Mukhtar ul Hassan, R. Farooq, H. U.
Saeed and Z. Saleem, “Sequential studies of beam
forming algorithms for smart antenna systems”, world
applied sciences journal, vol .6, no. 6, pp 754-758,2009
[4].http://www.iec.org
[5].http://www.smartantennas.googlepages.com