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The Basics of 802.11 Wireless LANsProduct Type: Market Research ReportPublished by: IEC Published: August 2005 Product Code: R329-81 Description OverviewThe integration of cellular networks, WLANs, and wireless metropolitan networks continues to progress rapidly, and wireless connection is becoming the norm in the daily lives of people around the world. The Basics of 802.11 Wireless LANs will help you understand the architecture and implementation of wireless local-area networks. This instructional resource examines the 802.11a, 802.11b, and 802.11g specifications, the benefits of each, and their interoperability. It also delves into the evolution of the various spread-spectrum techniques and explains the many forms of signal modulation, including frequency, amplitude, and phase. The Basics of 802.11 Wireless LANs also contains the latest information on broadband wireless access, including mobile wireless, fixed wireless, and Wi-Fi hotspots. This volume is a must-read for everyone, from students to business managers, who needs to sharpen their understanding of wireless communications. Table of Contents Table of ContentsChapter 1: A Hollywood Story Chapter 2: The Frequency Spectrum and the Secure Placement of Calls Radio Frequency Transmission The Electromagnetic Frequency Spectrum The Unlicensed Portion of the Frequency Spectrum Usage of the Licensed Portion of the Frequency Band for Cellular Communications Back to Hedy Lamarr's "Spreading of the Signal" Technique Chapter 3: Basic Modulation Schemes Modulation Types of Modulation Steps in Converting from an Analog Source to Digital Data Transmitting Voice over Telephone Wires Chapter 4: Advanced Modulation and Encoding Schemes Modulation Basics Amplitude Modulation Frequency Modulation Orthogonal Frequency Division Multiplexing Phase Modulation Phase Shift Keying Pulse Amplitude Modulation Pulse Code Modulation Digital Modulation Techniques Basic Encoding Techniques for Digital Data to Analog Signal Amplitude Shift Keying Frequency Shift Keying: Frequency Difference near Carrier Frequency Phase Shift Keying: Phase of Carrier Signal Shifted Binary Phase Shift Keying Differential Phase Shift Keying Quadrature Phase Shift Keying Quadrature Amplitude Modulation: QAM = ASK + PSK Chapter 5: Spreading the Signal across the Frequencies Frequency Hopping Spread Spectrum Direct Sequence Spread Spectrum Complementary Code Keying Chapter 6: The IEEE 802.11 Wireless LAN Standard The 802.11 Architecture 802.11 Media Access Control The Media Access Control and Logical Link Control Protocols Collision Avoidance Approach Timing and Power Beaconing The Basic Operation of 802.11 Networks with Control Frames Packet Acknowledgment Reliable Delivery: Two-Way Four-Way Reliability Media Access Methods for Control of Access to the Network The Distributed Access and Avoidance Method The Distributed Coordination Function The Point (Centralized) Control Function and the Short IFS The 802.11 Frame Format The IEEE 802.11 Standard Physical Media Chapter 7: IEEE 802.11a, 802.11b, and 802.11g WLANs The 802.11b Version of the IEEE 802.11 Wireless Network Standard The 802.11a Version of IEEE 802.11 Wireless Networking Orthogonal Frequency Division Multiplexing Scheme Eight Non-Overlapping 20-MHz Channels Forward Error Correction Multi-Path Reflection Data Rates and Ranges The MAC Layer — 802.11a The Four-Way Reliability Method Employed by 802.11a Compatibility and Incompatibility Features of 802.11a with 802.11b Transfer Rates and Distances of the Versions of 802.11 IEEE 802.11 g Comparing 802.11a, 802.11b, and 802.11g Technologies A Comparison of the Transmission Distances for 802.11 a, b, and g Chapter 8: 802.11 Wireless LAN Designs Access Points Channels RF Site Survey Site Channel Mapping Site Bandwidth Layout Example Designs for Specific Building Spaces Chapter 9: Wireless Metropolitan-Area Networks Unwired City Projects Chapter 10: Security for 802.11 Wireless LANs Insertion Attacks Jamming Wireless Sniffing Encryption and Cryptography Wired Equivalent Privacy WEP Authentication WEP's Shortcomings 802.11i TKIP CCMP 802.1x and Extensible Authentication Protocol RADIUS Technology Wi-Fi Protected Access: The Transition from WEP to 802.11i Chapter 11: Future Trends in Wireless LANs Even Faster Wireless LANs: 802.11n Portable Devices VoWi-Fi Chapter 12: Conclusion Appendix: Wireless Access Point and Router Vendors and Products 3Com ActionTec Electronics Adtran Technology Co. Ltd. Alvarion, Inc. AmbiCom, Inc. Anycom, Inc. APC (American Power Conversion) Apple Computer, Inc. Asanté Technologies Inc. ASUSTek Computer Inc. Avaya Inc. Belkin Components Buffalo Technology (USA), Inc. Cisco Systems, Inc. CNet Technology, Inc. Compex, Inc. CyberXLink D-Link Systems, Inc. Dell Computer Corp. Digi International Edimax Technology Co., Ltd. Efficient Networks, Inc. Enterasys Networks, Inc. Extreme Networks, Inc. Hawking Technologies Hewlett-Packard IBM Corp. Intermec IOGear Linksys Inc. Microsoft Corp. MicroSolutions, Inc. Motorola Corp. NetGear, Inc. Netopia Inc. Nomadix Nortel Networks Proxim Corp. SanDisk Corp. SMC Networks Socket Communications SonicWALL, Inc. Sony Electronics, Inc. StarTech Computer Products Symbol Technologies Toshiba TRENDware Troy Group, Inc. U.S. Robotics Zonet Zyxel Communications, Inc. |
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