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Wireless Local Area Network (WLAN) technology is rapidly becoming a crucial component of computer networks and has developed extremely during the past few years.  

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CONTENTS ABSTRACT i ACKNOWLEDGEMENT ii 1. INTRODUCTION 3 1.1 AIMS AND OBJECTIVES 3 1.2 REPORT STRUCTURE 4 2. METHODOLOGY 6 2.1 BACKGROUND 6 2.2 LITERATURE SEARCH 6 2.3 VISITING PORTSMOUTH UNIVERSITY 6 2.4 WIRELESS LAN PROTOTYPE 7 2.4.1 EVALUATION AND TESTING 7 2.4.2 ANALYSING THE TEST RESULTS 7 3. WIRELESS NETWORKING 8 3.1 WHAT IS WIRELESS NETWORKING? 8 3.2 WHY WIRELESS? 8 3.3 WIRELESS LAN TECHNOLOGIES 9 3.3.1 IEEE 802.11 9 3.3.2 HIPERLAN 10 3.3.3 HOMERF SWAP 11 3.3.4 BLUETOOTH 11 3.4 SPREAD SPECTRUM TECHNOLOGY 11 3.4.1 UNDERSTANDING SPREAD SPECTRUM 11 3.4.2 FHSS VS. DSSS 12 4. THE IEEE 802.11 WIRELESS STANDARD 14 4.1 BENEFITS OF THE 802.11 STANDARD 14 4.2 IEEE 802.11 TOPOLOGY 14 4.3 ROAMING 15 4.4 IEEE 802.11 LOGICAL ARCHITECTURE 16 4.5 IEEE 802.11 PHYSICAL LAYERS 17 4.6 IEEE 802.11 DATA LINK LAYER (LLC AND MAC) 17 4.6.1 LOGICAL LINK CONTROL (LLC) 17 4.6.2 MEDIA ACCESS CONTROL (MAC) 18 4.7 ACCESSING THE WIRELESS MEDIUM 18 4.7.1 CSMA/CA 19 4.7.2 THE HIDDEN NODE PROBLEM 20 4.8 JOINING A NETWORK 20 4.8.1 STATION SYNCHRONIZATION 20 4.8.2 PASSIVE AND ACTIVE SCANNING 21 4.9 PROVIDING AUTHENTICATION AND ENCRYPTION 21 4.9.1 OPEN SYSTEM AUTHENTICATION 22 4.9.2 SHARED KEY AUTHENTICATION 22 5. PROJECT CONTEXT - THE WIRELESS LAN PROTOTYPE 23 5.1 HARDWARE 23 5.1.1 WIRELESS LAN ACCESS POINT - DWL-1000AP 24 5.1.2 WIRELESS USB NETWORK ADAPTERS - DWL-120 24 5.1.3 SWITCH, SERVER AND CLIENTS 25 5.2 DESIGN OF THE WIRELESS LAN PROTOTYPE 26 5.3 SITE SURVEY - 4TH FLOOR AND ACCESS POINTS 27 5.4 WIRELESS LAN PROTOTYPE DESIGN 28 5.5 PROTOTYPE ASSESSMENT PARAMETERS 28 5.5.1 TRANSMIT FREQUENCY PARAMETERS 28 5.5.2 TRANSMISSION PROTOCOL PARAMETER 29 5.5.3 MEDIUM ACCESS PROTOCOL PARAMETERS 29 5.5.4 ENCRYPTION 29 5.6 IMPLEMENTING THE WIRELESS LAN PROTOTYPE 29 5.6.1 ACCESS POINT INSTALLATION 29 5.6.2 WIRELESS USB NIC ADAPTERS 32 6. EVALUATION AND TESTING 34 6.1 RANGE TEST 34 6.2 ROAMING AND OVERLAPPING TEST 36 6.3 PERFORMANCE TESTING 36 6.3.1 TCP/UDP RESPONSE TIME 38 6.3.2 TCP THROUGHPUT 40 6.3.3 UDP STREAMING THROUGHPUT 41 7. CONCLUSION 43 7.1 CRITICAL EVALUATION 44 7.2 FUTURE DEVELOPMENT 44 REFERENCES 45 INTERNET 45 BOOKS 50 APPENDIX A -...

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