11a wireless lan systems by james c chen phd jeffrey

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* “Measured Performance of 5-GHz 802.11a Wireless LAN Systems” By James C. Chen, Ph.D., Jeffrey M. Gilbert, Ph.D., Atheros Communications, Inc., 529 Almanor Ave., Sunnyvale, CA 94085 (408)773-5200 0 10 20 30 40 50 60 0 25 50 75 100 125 150 175 200 225 Range in Feet Data Rate in Mbps 802.11 a 802.11 b Distance vs. Rate SYSC-5403 WLAN 32 © Copyright Roshdy H. M. Hafez 1990-2007 1 13 12 11 10 9 8 7 6 5 4 3 2 2412 2417 2422 14 2432 2442 2452 2462 2472 2427 2437 2447 2457 2467 2477 Channel # Frequency Center in GHz Only Three Non-Overlapping Channels WiFi Channel Arrangement
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17 SYSC-5403 WLAN 33 © Copyright Roshdy H. M. Hafez 1990-2007 5.150 5.180 5.200 5.220 5.240 5.260 5.280 5.300 5.320 5.350 GHz 8 channels 20 MHz 16.25 MHz 52 Carriers/channel 312.5 kHz 802.11a SYSC-5403 WLAN 34 © Copyright Roshdy H. M. Hafez 1990-2007 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 2 3 3 2 2 3 3 3 2 2 1 6 5 8 7 1 3 5 2 2 3 6 6 4 7 8 2 3 5 4 7 5 7 6 4 3 6 8 1 8 1 1 802.11a 8 Channels 802.11b 3 Channels WiFi Frequency Reuse Patterns
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