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SMART ANTENNA SYSTEMS. SMART ANTENNA SYSTEMS Increasing use in Mobile Wireless Communications du e t o demand for Higher Capacity Higher Coverage Higher bit rate Improved link quality Mobility. Smart Antenna A ntenna with a digital signal processing

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SMART ANTENNA SYSTEMS

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SMART ANTENNA SYSTEMS


  • SMART ANTENNA SYSTEMS

  • Increasing use in Mobile WirelessCommunicationsdue todemand for

    • Higher Capacity

    • Higher Coverage

    • Higher bit rate

    • Improved link quality

    • Mobility


  • Smart Antenna

  • Antenna with a digital signalprocessing

  • capability to transmit and receive in an

  • adaptive and

  • spatiallysensitive

  • manner.


  • Aim

  • to maximize the antenna gain in the desired direction

  • to minimize the gain in directions of interferers


An Example:

Smart Antenna Array = “a person’s head”


TYPES

  • (According to level of intelligence)

  • Switched Beam Antennas

  • Phased Arrays

  • Adaptive Arrays


Top View

Top View

Antenna Array

Antenna

SMART ANTENNAS (1)

Omnidirectional

Sectorized


Active Beam

Desired User

Antenna Array

Interfering User

Antenna Array

SMART ANTENNAS (2)

Switched Beam System

Adaptive Array


TYPES


TYPES

SDMA (Space Division Multiple Access)


Downlink: Transmission Part


Uplink: Reception Part


Comparison of Switched Beam Antennas and Adaptive Arrays:


USAGE

  • cellular and wireless networks

  • radar

  • electronic warfare (EWF) as a countermeasure to electronic jamming

  • satellite systems


SOME BENEFITS

  • Capacity increase

  • Range increase

  • Multipath rejection

  • Reduced expense

  • Higher reliability (security)


SOME DRAWBACKS

  • Transceiver complexity

  • Resource management

  • Physical size


REFERENCES

[1]“Smart Antenna Systems Tutorial”, The International Engineering Consortium, 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

[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/

[5]“Smart Antennas – A Non-technical Introduction”, SYMENA Software & Consulting GmbH, http://www.symena.com/Smart Antennas - A Nontechnical Introduction - SYMENA.pdf


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