Smart antennas breed better wlans
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Smart Antennas Breed Better WLANs . Jack H. Winters Chief Scientist Motia, Inc. December 3, 2003 [email protected] 732 208-5568. Smart Antennas. SIGNAL. SIGNAL. BEAM SELECT. SIGNAL OUTPUT. BEAMFORMER. INTERFERENCE. BEAMFORMER WEIGHTS. INTERFERENCE. Adaptive Antenna Array.

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Smart Antennas Breed Better WLANs

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Smart antennas breed better wlans

Smart Antennas Breed Better WLANs

Jack H. Winters

Chief Scientist

Motia, Inc.

December 3, 2003

[email protected]

732 208-5568


Smart antennas breed better wlans

Smart Antennas

SIGNAL

SIGNAL

BEAM SELECT

SIGNAL OUTPUT

BEAMFORMER

INTERFERENCE

BEAMFORMER WEIGHTS

INTERFERENCE

Adaptive Antenna Array

Switched Multibeam Antenna

SIGNAL OUTPUT

  • Smart antenna is a multibeam or adaptive antenna array that tracks the wireless environment to significantly improve the performance of wireless systems

  • Adaptive arrays in any environment provide:

  • Antenna gain of M

  • Suppression of M-1 interferers

  • In a multipath environment, they also provide:

  • M-fold multipath diversity gain

  • With M Tx antennas (MIMO), M-fold data rate increase in same channel with same total transmit power


Smart antennas breed better wlans

Smart

Antenna

AP

Smart

Antenna

Smart Antennas for WLANs

AP

Smart

Antenna

Interference

Smart Antennas can significantly improve the performance of WLANs

  • TDD operation (only need smart antenna at access point or terminal for performance improvement in both directions)

  • Higher antenna gain  Extend range/ Increase data rate/ Extend battery life

  • Multipath diversity gain  Improve reliability

  • Interference suppression  Improve system capacity and throughput

    • Supports aggressive frequency re-use for higher spectrum efficiency, robustness in the ISM band (microwave ovens, outdoor lights)

  • Data rate increase  M-fold increase in data rate with M Tx and M Rx antennas (MIMO 802.11n)


Smart antennas breed better wlans

Smart Antennas for WLANs

  • Smart Antennas can (and to be successful should):

  • Be standards compliant

  • Work with any antennas:

    • Two antennas on APs and clients today

    • Four antennas in same space (e.g., PCMCIA card) with dual polarization

  • Can be added to existing systems for slight cost increase

  • Can be added to AP or client:

  • On AP:

  • All AP users have greater range

  • Higher system capacity

  • On client:

  • Greater range

  • Interference immunity

  • On both:

  • Gains are additive

  • Evolution to MIMO with standards (802.11n)


Smart antennas breed better wlans

JavelinChip

Existing Transceiver

Adaptive Array Appliqué

  • Four-antenna RF IC with analog weight calculation (plug-and-play/blind MRC Tx and Rx) provides:

  • 12-13 dB gain (vs. one antenna) in Rayleigh fading with 802.11b/g

  • 7-10 dB gain with 30-50 ns delay spread

  • Increases throughput by 50% (typical)

  • Reduces power drain by up to 90%


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