144 - Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol...

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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Wireless Networks Networking Anywhere You Want It Daniel Zappala Brigham Young University Computer Science Department Wireless Networks Daniel Zappala 1/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points 1 Wireless Networks 2 CDMA 3 WiFi 4 WiFi MAC 5 WiFi Protocol 6 BlueTooth and WiMAX 7 Take-Home Points Wireless Networks Daniel Zappala 2/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Questions of the Day How do wireless nodes communicate? How does WiFi work? Wireless Networks Daniel Zappala 3/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Motivation mobile phone subscribers now outnumber wired phone subscribers similar trend likely with Internet use Internet-enabled cell phones popularity of wireless access protocols many challenges communication over a highly lossly wireless link providing last-hop connectivity to mobile Internet users providing connectivity in networks of mobile users Wireless Networks Daniel Zappala 4/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Wireless Networks wireless access point: relay between wireless and wired nodes wireless hosts: laptop, PDA, phone wireless networks: clouds of wireless hosts Wireless Networks Daniel Zappala 5/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Wireless Link Characteristics radio signal strength weakens as it propagates interference from other sources and other devices (phones, motors) can cause packet loss radio signal can bounce off objects, arriving at destination multiple times Wireless Networks Daniel Zappala 6/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Wireless Signals BER : bit error rate SNR : signal-to-noise ratio BPSK : modulation scheme used in 802.11 QAM: modulation scheme used in cable modems, digital TV Wireless Networks Daniel Zappala 7/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX Take-Home Points Wireless Signals for a given modulation scheme, the higher the SNR, the lower the BER increase transmission power to lower SNR too high, and you interfere with other wireless users and you don’t gain much in BER Wireless Networks Daniel Zappala 7/26
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Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol BlueTooth and WiMAX
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This note was uploaded on 10/18/2011 for the course CS 460 taught by Professor Staff during the Spring '05 term at BYU.

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144 - Wireless Networks CDMA WiFi WiFi MAC WiFi Protocol...

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