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There are very few techniques proposed today, which are able to improve radio network

What is smart antenna?. Smart antenna are antenna arrays with smart signal processing algorithms used to identify the direction of arrival of signal and to calculate beam forming vectors to track and locate the antenna beam on the target. .

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There are very few techniques proposed today, which are able to improve radio network

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  1. What is smart antenna? Smart antenna are antenna arrays with smart signal processing algorithms used to identify the direction of arrival of signal and to calculate beam forming vectors to track and locate the antenna beam on the target. There are very few techniques proposed today, which are able to improve radio network performance dramatically - Spatial processing - Multi-user detection - Channel reuse based on polarization - Advanced network control Spatial processing is among them and can be effectively combined with others techniques….

  2. Aim of any Rf Antenna • To maximize the antenna gain in the desired direction • To minimize the gain in directions of interferers • To Reduce path losses • Overall performances of network

  3. WHY SMART ANTENNA ARRAYS..? • Higher Capacity • Higher Coverage • Higher bit rate • Improved link quality • Spectral efficiency • Mobility

  4. Smart Antenna Technology: Benfactors Network capacity, coverage, less internetwork interference, filling “dead spots”, fewer BSs,QoS,new services... New market for more advanced BSs, flexible radio network control... Higher QoS, more reliable, secure communication, new services, longer battery life... Operator OEM User

  5. Smart Antenna Technology:Motivation Link level improvements System improvements - Interference cancellation at the up and down links - SNR improvement due to antenna gain - Multipath fading mitigation capacity coverage Quality of service (QoS), bit rate, mobility rate

  6. Smart Antenna Propagation • 1) Phased arreysystem • Use a number of fixed beams • Select one of several beams to enhance receive signals • 2) adaptive array system • Be able to change its antenna pattern dynamically

  7. Broadcast channels control with SA

  8. Different propagation environment WLL MSC LOSS Urban area BS BS NoLOSS Less density area BS MSC

  9. Working principle Work With multiple antennas at both ends of a radio link.. Channel capacity grows linearly with number of antennas by sending different messages on each antenna with same carrier frequency 8 antennas yield 8 times the capacity If send same message on each antenna Then we get only the power gain of the antenna array, and Capacity grows only logarithmically with the number of antennas 8 antennas yield 3 times the capacity

  10. Smart Ant. Tech. SA Integration into Cellular Networks 1G- analog systems 2G- digital systems 2.5G- digital+packet +.. (GPRS,..) 3G - W-CDMA 4G- cellular+ gigabit WLAN Network Planning - Capacity, coverage, interference planning - Joint fixed and radio network optimization, planning - System upgrade, economical issues Radio Network Management Radio Interface Receiver structure, Tx, Rx algorithms - Spatial proc. - Time domain proc. - Coding - Detection - Diversity - ……….. Services -> MS location DSP tech. SW Radio Network control - Resource management - call control Cell control - admission control - broadcast channel control - handover control - macro-diversity control 1G 2G Air Interface - Multiple access - Duplexing - Modulation - Framing - Availability of pilots 2.5G Link level control - Power Control - Quality Control - Tracking 3G 4G

  11. Smart Antennas in Mobile Communications on the Globe ArrayComm(USA) - installations in WLL - tests for GSM 1800 GigabitWireless(USA) WLL Ericsson (SW) first system system solution with SA GSM (commercially available) Radio Design AB (SW) NMT-450 NTT DoCoMo (Japan) Testbed for UTRA “ IntelliWave” Wireless Local Loop System Raytheon (USA) Commercially available Adaptive Smart Antenna System ARPA (USA )/GloMo project Metawave (USA) UMTS … Commercially available IntelliCell Switched Beam System TSUNAMI-SUNBEAM-SATURN/METRA Projects (EU)

  12. Top View Top View Antenna Array Antenna Conventional Antennas& Arrays Omnidirectional Sectorized

  13. Spatial Processing Approaches Sectorization - Sectorization - Macro-diversity with: * Combining (MRC,IRC) * Prefiltering/Coding (Trx. Coding, V-BLAST,...) - Beamforming (BF) Switched-beam Smart Antenna Adaptive beamforming Macro-diversity Switched-beam ant. Adaptive BF

  14. SNR CCI Diversity ISI Time domain diversity Improved Parameters Beamforming = BS MS

  15. Ways & Effect of Smart Antenna

  16. Interference Rejection Comparison Desired Signals Co-channel Interfering Signals

  17. Spatial Filtering for Interference Reduction (SFIR)

  18. A simple example Design a beamformer with unit response at 600 and nulls at 00, -300, -750

  19. SDMA • Spatial Division Multiple Access Uses an array of antennas to provide control of space by providing virtual channels in an angle domain

  20. SDMA (Space Division Multiple Access)

  21. USAGE OF SMART Antenna • Applications to: • Cellular and wireless networks • Radar • Electronic warfare (EWF) as a countermeasure to electronic jamming • Satellite systems

  22. Advantage of Smart Antenna - Improvement in SNR due to beamforming/combining array gain. (Improved coverage. ) - Reduced ISI. - Enhanced spatial diversity. Path diversity. - Interference cancellation. In Trx. and Rx. Capacity. - Improved transmission rate with link adaptation techniques. - Low wastage of power

  23. Drawbacks of Smart antenna Smart Antennas might be not very smart (Complexity) Integrated but relatively simple system design can provide considerable improvement with low level of complexity Cost is one of the major factor in Smart Antenna approach

  24. Acknowledgement Thanks to

  25. Thanks to allforKind attention

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