Performance Enhancement for WiFi Communications

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Performance Enhancementfor Wi-Fi Communications
Presented by Tanim M. Taher
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Study of Interference by MicroWave Ovens (MWO)
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Experimental Analysis of MWO Signal

• The Residential MWO signal is synchronized with
  the 60 Hz AC line cycle, and it radiates in the
  positive half cycle only.
• The MWO signal has the main characteristics
• An AM-FM signal that is radiated for about 5-6
  ms.
• Transient signals before and after FM signal
  (1ms).

On cycle of MWO
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• Power Spectral Density of MWO Signal

• Most power is concentrated over the narrow
  frequency range (15 MHz) swept by AM-FM signal.
• There is power scattered over entire ISM band.
• The wideband power is due to transients.

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MWO Signal Model
On cycle of MWO
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MWO Signal Spectrogram
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Interference Spectrogram
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Interference Mitigated
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Experimental BER Results
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Interference Mitigation Technique

• Data transmission using 802.11 channel 1 (shaded
  areas are transient locations)

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Thank you!Questions?Tanim Taher
(tahetan_at_iit.edu)