1. SMART ANTENNA SYSTEMS

2. Increasing use in Mobile Wireless Communications due to demand for  Higher Capacity  Higher Coverage  Higher bit rate  Improved link quality  Mobility

3. Smart Antenna Antenna with a digital signal processing capability to transmit and receive in an adaptive and spatially sensitive manner.

4. Aim to maximize the antenna gain in the desired direction to minimize the gain in directions of interferers

5. An Example: Smart Antenna Array = “a person’s head”

6. TYPES (According to level of intelligence) Switched Beam Antennas Phased Arrays Adaptive Arrays

7. SMART ANTENNAS (1) Antenna Top View Antenna Array Top View OmnidirectionalSectorized

8. SMART ANTENNAS (2) Switched Beam SystemAdaptive Array Antenna Array Desired User Interfering User Antenna Array Active Beam

9. TYPES

10. SDMA (Space Division Multiple Access)

11. Downlink: Transmission Part

12. Uplink: Reception Part

13. Comparison of Switched Beam Antennas and Adaptive Arrays: CriteriaSwitched BeamAdaptive Array Integration Easy to implement Low cost Transceiver complexity High cost Range / Coverage More coverage compared to conventional systems More coverage compared to switched beam system Interference Rejection Difficulty in distinguishing between desired signal and interferer Does not react to the movement of interferers. Focusing is narrower Capable of nulling interfering signals

14. USAGE cellular and wireless networks radar electronic warfare (EWF) as a countermeasure to electronic jamming satellite systems

15. SOME BENEFITS Capacity increase Range increase Multipath rejection Reduced expense Higher reliability (security)

16. SOME DRAWBACKS Transceiver complexity Resource management Physical size

17. REFERENCES [1 ] “Smart Antenna Systems Tutorial”, The International Engineering Consortium, http://www.iec.org/online/tutorials/smart_ant/http://www.iec.org/online/tutorials/smart_ant/ [2] Lehne, P.H. and Pettersen M., “An Overview of Smart Antenna Technology for Mobile Communications Systems”, IEE Communications Surveys, Fourth Quarter 1999, vol. 2, no.4, http://www.comsoc.org/livepubs/surveys/public/4q99issue/pdf/Lehne.pdf http://www.comsoc.org/livepubs/surveys/public/4q99issue/pdf/Lehne.pdf [3] Schüttengruber, W., Molisch A.F. and Bonek E., “Smart Antennas for Mobile Communications Tutorial”, http://www.nt.tuwien.ac.at/mobile/research/smart_antennas_tutorial/index.en.html [4] “Smart Antennas Tutorial,” http://viterbi.ece.iisc.ernet.in/prem/SmartAnt/http://viterbi.ece.iisc.ernet.in/prem/SmartAnt/ [5] “Smart Antennas – A Non-technical Introduction”, SYMENA Software & Consulting GmbH, http://www.symena.com/Smart Antennas - A Nontechnical Introduction - SYMENA.pdfhttp://www.symena.com/Smart Antennas - A Nontechnical Introduction - SYMENA.pdf