CSE5345_Lecture8

CSE5345_Lecture8 - 1 CSE 5345 – Fundamentals of Wireless Networks Yonghe Liu [email protected] Last Class Convolutional Code(n k K Encoder

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Unformatted text preview: 1 CSE 5345 – Fundamentals of Wireless Networks Yonghe Liu [email protected] 2/9/12 Last Class Convolutional Code (n, k, K) Encoder Decoder Last Part: PHY Layer Open Space Transmission Wireless Channel Channelization T/F/C-DMA Encoding/Modulation Forward Error Control Today Wireless LAN Discuss Project Networking Lab • ERB 124 2 5 What is IEEE 802.11? IEEE: Institute of Electrical and Electronics Engineers 802.11: Family of standards set forth by the IEEE to define the specifications for wireless LANs Defines: • Medium Access Control (MAC) • Physical Layer (PHY) 6 IEEE 802.11 and the ISO stack 7 IEEE 802.11 (1997, MAC+PHY) Local, high-speed wireless connectivity for fixed, portable and moving stations stations can be moving at pedestrian and vehicular speeds Standard promises interoperability vendors products on the same physical layer should interoperate Targeted for use in inside buildings, outdoor areas, anywhere! 8 IEEE 802.11 Uses Direct Sequence spread spectrum (DSSS) technology Frequency-Hopping spread spectrum (FHSS) can only be used for 1 or 2Mbps in US due to FCC regulations Operates in unlicensed 2.4 GHz ISM band ISM: Industrial, Scientific and Medical ISM regulatory range: • 2.4 GHz to 2.4835 GHz for North America 3 9 IEEE 802.11 Supported Speeds and Distances 1, 2 Mbps at distances of 150-2000 feet without special antenna Greater distances can be achieved by using special antennas Distance (or signal strength) greatly depends on obstructions such as buildings and other objects Maximum speed obtained depends on signal strength 10 IEEE 802.11b (1999, PHY) ‘b’ in IEEE 802.11b September 1999, 802.11b “High Rate” September 1999, 802....
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This note was uploaded on 03/22/2012 for the course CSE 5345 taught by Professor Youngheliu during the Spring '12 term at UT Arlington.

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CSE5345_Lecture8 - 1 CSE 5345 – Fundamentals of Wireless Networks Yonghe Liu [email protected] Last Class Convolutional Code(n k K Encoder

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