Lecture1 - ELEN E4703 3.0 Units Angel Lozano Lecture 1...

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ELEN E4703 3.0 Units Angel Lozano Lecture 1 Outline Course Logistics Syllabus The Wireless Vision Applications, Requirements and Challenges Notions of traffic theory. Brief Historical Tour Spectrum Regulation and Standards The Cellular Concept and its Guiding Principles System Classification Text: “Wireless Communications” by Andrea Goldsmith Appendix B of the text provides a review of probability and random variables. Grading HW 20% Midterm 30% Final 50% Course Goals Provide a broad coverage of all major themes relevant to the functioning of a wireless communications system. To study in some detail a few central topics. Mobile radio channel Multiple access Interference management Course Syllabus Introduction (1) The Mobile Radio Channel (1-2) Capacity of Wireless Channels (1) Digital Modulation (1) Equalization (1) Diversity (1) Coding (1) Spread Spectrum (1) Multiuser Communication: Multiaccess (1-2) Multiuser Communication: Interference Management (1-2) Time Stamp: 13m00s 1
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The Wireless Vision Multimedia communication from anywhere, anytime, using a portable device. Increasingly, communication may be people-to-machine and machine-to-machine. Applications Voice Text Messaging Still Pictures Video Web browsing File transfer Gaming Sensing Remote Control Military (unmanned vehicles) Time Stamp: 21m00s QoS (Quality-of-Service) QoS refers to the needs of a given application: Data rate (R in bits/s) – a measure of speed. BER (Bit Error Rate) – a measure of quality. Latency (ms) – a measure of delay. Blockage and dropping probabilities. Vary widely depending on application. Example: Voice (R ~ 10Kbps; BER ~ 10^-3; Latency <= 100ms; blockage < 3%) Classification An additional feature of an application is whether the nature of its traffic is continuous or bursty. For some applications (e-commerce), security and authentication are important. Application Data Rate BER Latency Traffic Voice Low Medium Low Continuous Messaging Very Low Very Low High Bursty Pictures Medium Low High Bursty Video High Low Low Continuous Web Browsing Low Very Low Medium Bursty File Transfer Low to High Very Low High Bursty Gaming Low Very Low Very Low Bursty Time Stamp: 30m00s 2
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Challenges Wireless channels are an unreliable and capacity-limited broadcast communication medium. Traffic patterns, user locations, and network conditions are constantly changing. Applications are heterogeneous with hard QoS needs that must be met by the system. Much harder to provide QoS over wireless relative to wireline networks. Wireless networks lag wireline networks in data rate, BER, and latency.
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Lecture1 - ELEN E4703 3.0 Units Angel Lozano Lecture 1...

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