04-04-2011, 11:52 AM
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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.
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
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 .
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.
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.
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).
Benefits of Switched Beam and Adaptive Array systems
• Integration.
• Range or coverage.
Interference suppression
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.
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
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 .
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.
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.
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).
Benefits of Switched Beam and Adaptive Array systems
• Integration.
• Range or coverage.
Interference suppression
