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SMART ANTENNA

SMART ANTENNA. What is Smart Antenna?. A smart antenna system combines multiple antenna elements with a signal-processing capability to optimize its radiation and/or reception pattern automatically in response to the signal environment.

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SMART ANTENNA

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  1. SMART ANTENNA

  2. What is Smart Antenna? • A smart antenna system combines multiple antenna elements with a signal-processing capability to optimize its radiation and/or reception pattern automatically in response to the signal environment. • In truth, antennas are not smart—antenna systems are smart. Generally co-located with a base station, a smart antenna system combines an antenna array with a digital signal-processing capability to transmit and receive in an adaptive, spatially sensitive manner.

  3. Types of Smart Antenna systems • Smart antenna systems are customarily categorized, as either switched beam or adaptive array systems. • ·  Switched beam—a finite number of fixed, predefined patterns or combining strategies (sectors) • · Adaptive array—an infinite number of patterns (scenario-based) that are adjusted in real time

  4. Switched Beam Antennas • It form multiple fixed beams with heightened sensitivity in particular directions. • These antenna systems detect signal strength, choose from one of several predetermined, fixed beams, and switch from one beam to another as the mobile moves throughout the sector. • switched beam systems combine the outputs of multiple antennas in such a way as to form finely sectorized (directional) beams with more selectivity .

  5. Switched Beam Antennas SUMMER TRAINING PRESENTATION 2004 Figure- Switched Beam System Coverage Patterns (Sectors) [5] BANDANA ROUT

  6. Adaptive Array Antennas • Adaptive antenna technology represents the most advanced smart antenna approach by using a variety of new signal-processing algorithms. • It provides optimal gain while simultaneously identifying, tracking, and minimizing interfering signals.

  7. Adaptive Array Antennas SUMMER TRAINING PRESENTATION 2004 Figure- Adaptive Array Coverage [7] BANDANA ROUT

  8. The goals of a smart antenna system • The purpose of a smart antenna system is to augment the signal quality of the radio-based system through more focused transmission of radio signals while enhancing capacity through increased frequency reuse. • The features of a smart antenna system are • - signal gain. • - inference rejection. • -power efficiency.

  9. Architecture of smart antenna system • Switched beam and adaptive array systems enable a base station to customize the beams they generate for each remote user effectively by means of internal feedback control. • Listening to the cell.(uplink processing). • Speaking to the users(downlink processing).

  10. Benefits of Switched Beam and Adaptive Array systems • Integration. • Range or coverage. • Interference suppression.

  11. Who can use smart antennas ? • Smart antenna technology can significantly improve wireless system performance and economics for a range of potential users. • It enables operators of PCS, cellular, and wireless local loop (WLL) networks to realize significant increases in signal quality, capacity, and coverage.

  12. Advantages of smart antenna • Smart antennas can help systems meet these requirements in the following manner: • First, both phased and adaptive arrays provide increased power by providing higher gain for the desired signal. • In terms of interference suppression, phased arrays reduce the probability of interference with the narrower beam, and adaptive arrays adjust the beam pattern to suppress interference.

  13. Uses of smart antenna • Phased arrays are mainly being studied for point-to-point wireless systems, e.g., for wireless local loops. • Adaptive arrays are being considered on cellular terminals where local scattering causes wide angular spread. • In the TDMA system ANSI-136 adaptive antenna algorithms have been widely deployed.

  14. Conclusion • The use of smart antennas is not purely a radio transmission issue. • It also influences network services such as handover and connection setup. • A smart antenna is a digital wireless communications antenna system that takes advantage of diversity effect at the source (transmitter), the destination (receiver), or both.

  15. Thank You!!!

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