IEEE 802.11b Frequency Translation

This thesis investigates the IEEE 802.11b standard that describes radio communication for networks. The standard is carefully explained and the limitations of the standard are presented. To put the system in its context and to study the effects from the frequency translation, surrounding areas such as radio propagation and networks in general are presented. For radio communications the carrier frequency gives the basic properties for the application, long distance communication uses low frequencies and the opposite for short-range communication. The report investigates the possibilities to translate the frequency for an IEEE 802.11b system to move the limits of IEEE 802.11b Three alternative solutions are compared…


1 Introduction
1.1 Background
1.2 Problem Definition
1.3 Thesis Outline
2 Radio Propagation
2.1 Introduction
2.2 Free Space Propagation
2.3 Multipath Model
2.3.1 Rayleigh Distribution
2.3.2 Carrier Frequency Comparing
3 Network Topology
3.1 Introduction
3.2 The OSI-model
3.3 Multiple Client Network
3.4 CSMA
4 IEEE 802.11
4.1 Introduction
4.2 Substandards in IEEE 802.11
4.2.1 IEEE 802.11b
4.3 Medium Access Control, MAC
4.4 Physical Layer, PHY
4.4.1 Direct Sequence Spread Spectrum, DSSS
4.4.2 High Rate DSSS Using CCK
4.4.3 PBCC
4.4.4 Scrambling
4.4.5 OFDM
4.4.6 Modulation Techniques
4.5 Security
4.5.1 Wireless Equivalent Privacy, WEP
4.5.2 Authentication
4.5.3 Security Issues in IEEE 802.11b
4.6 Hardware for IEEE 802.11b
4.6.1 Receiver
4.6.2 IEEE 802.11b
5 Investigation
5.1 Introduction
5.2 Client-client or Client-accesspoint?
5.3 Basic Investigation
5.4 Initial Suggestions
5.4.1 Alternative I
5.4.2 Alternative II
5.4.3 Alternative III
5.5 Limitations and Decisions
5.5.1 AWL-700AP
5.5.2 Link Budget Using a Circulator
5.6 Final Suggestion
6 Conclusions and Future Work
6.1 Discussion
6.2 Future Work

Author: Harju, Janne

Source: Linköping University

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