1 Performance Enhancement for Wi-Fi Communications Presented by Tanim M. Taher.
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Transcript of 1 Performance Enhancement for Wi-Fi Communications Presented by Tanim M. Taher.
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Performance Enhancementfor
Wi-Fi Communications
Presented byTanim M. Taher
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Study of Interference by MicroWave Ovens (MWO)
Why can I never connect to the internet during lunch time everyday?
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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:
1. An AM-FM signal that is radiated for about 5-6 ms.
2. 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 ResultsMWOMWO CaseCase BERBER
11 NO MITIGATIONNO MITIGATION 11.29%11.29%
22 NO MITIGATIONNO MITIGATION 1.661%1.661%
33 NO MITIGATIONNO MITIGATION 0.7315%0.7315%
11 MITIGATIONMITIGATION 00
22 MITIGATIONMITIGATION 00
33 MITIGATIONMITIGATION 00
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Interference Mitigation Technique
• Data transmission using 802.11 channel 1 (shaded areas are transient locations)