WIRELESS LAN:PAST, PRESENT, AND FUTURE

Steven RenoDepartment of Computer Science

University of Wisconsin- Platteville

renosteven@gmail.com

CONTENTS

Introduction History Wi-Fi Today The Future of Wi-Fi Current Applications Problems Conclusion

INTRODUCTION

Nation of Convenience Stores Fast-food Microwaves Remote-controls

And now…Wireless LAN Ease of use

INTRODUCTION

Wireless Telegraph- late 19th century Morse Code

Radio- after telegraph/telephone No speech at first

INTRODUCTION

Wireless LAN Wireless Fidelity (Wi-Fi)

Usage Today Homes Offices Public places

Devices Computers Smartphones Music players Appliances

INTRODUCTION

IEEE- Institute of Electrical and Electronics Engineers

LAN 802.3

WLAN 802.11

Wireless- a very broad field Cellular Home telephony RFID

HISTORY

The need for WLAN First WLAN

ALOHAnet (1970) First Devices

ARLAN-SST (1988) RangeLAN (1989)

802.11 committee

HISTORY

RangeLAN2 (1994)

802.11-1997

WI-FI TODAY

IEEE established the standard- 802.11

First two amendments adopted: 802.11a 802.11b

WI-FI TODAY

802.11g Best of both worlds (from a/b)

802.11b remains dominant

WI-FI TODAY

Wireless Ethernet Compatibility Alliance (WECA) Now, Wi-Fi Alliance Interoperability testing Certification of 802.11 products

FUTURE OF WLAN

802.11n Increase Throughput Increase Range Multiple Input Multiple Output (MIMO) Spatial Division Multiplexing (SDM) Channel Width

MORE 802.11N

Backwards Compatibility Dual Mode 2.4 GHz Mode

Draft 802.lln Certified Since 2007

APPLICATIONS OF WLAN

Offered to Customers Attract Stay Example- coffee shops

APPLICATIONS OF WLAN

Business Travelers Airports Airplanes Hotels Conference Centers

College Students Campus Wi-Fi

PROBLEMS

Security Prevent Unauthorized Access WEP WPA MAC ID Filtering

MORE PROBLEMS

Range

Propagation Natural Interference Man-Made Interference

CONCLUSION

Constant Technology Improvement Faster Longer Range More Secure

Future IEEE 802.11n

Throughput Range Backwards Compatibility

CONCLUSION

Wireless Culture Retail Business College

Few Problems Security Range Propagation

REFERENCES Derfler, F., & Freed, L. (2005). How Networks Work. Indianapolis: Que Publishing.

Flickenger, R. (2007). Wireless Networking in the Developing World. Hacker Friendly LLC.

  IEEE 802.11. Wikipedia. Retrieved Nov. 2, 2009

<http://en.wikipedia.org/wiki/IEEE_802.11>.

Learn About Wireless Antennas. Retrieved Nov. 2, 2009. <http://www.wirelessantennahelp.com/index.htm>.

Negus, K. J. (2008, Apr. 4). History of WLANs in the Unlicensed Bands. 1-13. Retrieved Nov. 2, 2009.

  Stallings, W. (1005). Wireless Communications and Networks. Upper Saddle River:

Pearson Prentice Hill.  Wireless LAN. Wikipedia. Retrieved Nov 2, 2009

<http://en.wikipedia.org/wiki/Wireless_LAN>.  Wireless Without Compromise: Delivering the promise of IEEE 802.11n. Meru

Networks Retrieved Nov. 2, 2009.

THE END

Any Questions?