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Heterogeneous WiFi 802.11 a/b/g/n

Heterogeneous WiFi 802.11 a/b/g/n. Sarah El-Helw Jennifer Ogunlowo. Evaluate performance of Wi-Fi standards under multiple network conditions. 802.11n provides greater throughput and more range. Wi-Fi performance is easily affected by various interference. 802.11b

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Heterogeneous WiFi 802.11 a/b/g/n

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  1. Heterogeneous WiFi802.11 a/b/g/n Sarah El-Helw Jennifer Ogunlowo

  2. Evaluate performance of Wi-Fi standards under multiple network conditions. 802.11n provides greater throughput and more range. Wi-Fi performance is easily affected by various interference. 802.11b 2.4 – 5 GHz unlicensed radio spectrum Delivers 11 MB/s Uses DSSS (Direct Sequence Spread Spectrum) 802.11a 5 – 6 GHz Delivers 54 MB/s Uses OFDM (Orthogonal Frequency-Division Multiplexing) 802.11g 2.4 – 5 GHz range Delivers 54 MB/s Uses OFDM Introduction Prof. Ghassan AlRegib Summer 2007 ECE 3076

  3. Milestones • Background study on 802.11a/b/g/n. • Set-up basic topology and run traffic tools. • Compare different technologies under multiple network conditions. • Evaluate performance of multiple technologies under the same vicinity • Present analysis of results.

  4. Preliminary milestones • Obtained research on Wi-Fi standards. • Set-up topology between wired server and wireless client. • Transferred packets between client and server using Iperf. • Analyzed network performance indoors, outdoors, and microwave interference.

  5. Co-existence of multiple technologies802.11g & n

  6. Co-existence of multiple technologies802.11 a & b

  7. Outdoors Results • Selected greater distances to measure throughput ~ 150ft, 250ft. • Used additional tool, NetStumbler, to analyze signal strength over various distances. • Wired server indoors partitioned by glass, wireless client outdoors. • Observed presence of 32 additional AP’s.

  8. ~150ft (running TCP)

  9. ~150 ft (running UDP)

  10. ~250ft (running TCP)

  11. NetStumbler • Detects the presence of various access points. • Displays the signal strength in dBm against time. • Shows valid signal strength based on wireless cards in client machines. • Taller the green plot, the stronger the signal.

  12. NetStumbler • Signal quality evaluation : Decreased signal strength with increased distance yields low throughput.

  13. ~300 ft for 802.11n • 802.11n AP was only active AP for distance of ~300ft. • Signal lost over distance greater than 300ft.

  14. non -LOS • Experiments performed with wired server in one room and wireless client in other room, separated by a wall.

  15. Summary and Future Work • 802.11 a and 802.11 gSRX were superior to b and g performance. • 802.11a preformed best under most usual settings, while 802.11 gSRX was the best at a great distance. • Wi-Fi performance can be affected by various interference like microwave ovens, AP’s. • The future work would be to obtain an 802.11n router once they’ve completely been released, and compare it with the current network performance.

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