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Communications Systems ASU Course EEE455/591

Communications Systems ASU Course EEE455/591. Instructor : Joseph Hui Monarch Institute of Engineering. Textbook and Labs. Primary: Communications System Engineering, 2 nd Edition Author: John Proakis , Prentice Hall, 2001 The textbook contains more details than necessary for undergrads.

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Communications Systems ASU Course EEE455/591

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  1. Communications SystemsASU Course EEE455/591 Instructor: Joseph Hui Monarch Institute of Engineering

  2. Textbook and Labs • Primary: Communications System Engineering, 2nd Edition • Author: John Proakis, Prentice Hall, 2001 • The textbook contains more details than necessary for undergrads. • Lecture notes • The PowerPoint files contain almost all information needed • A Word file for each lecture is posted from earlier years. • Prerequisite: • Linear system/Transform methods (EEE303) • Probability (EEE350) • Lab sessions: • Graduate students now have to take the lab • Undergraduate students always take the lab

  3. Syllabus and Reading Material • Syllabus and topics covered: • This course is an introduction to basic communication techniques, including data sources, analog communications, digital communications, channel and source coding, and modern wireless communications. Examples of modern communication systems. • Goal of the course: • To understand the principles behind the design of communications systems, such as AM/FM radio, TV broadcasting, the digital telephone network, and cellular telephone networks of different generations. • Reading assignment for each lecture: • For today, read textbook sections 1.1 – 1.3 • Reading assignment stated in each PowerPoint • I’ll try to work out some examples in each class.

  4. Course Grading • Two quizzes • 1st quiz held in class as indicated on course documents • 2nd quiz held in class as indicated on course documents • Each quiz covers half of the material • 1 page of formula sheet on two sides allowed • For EEE455, each quiz is 25% of grade • For EEE591, each quiz is 40% of grade • For EEE455, 6 labs for 25% of grade • 10 homework, roughly one every week • For EEE455, total 15% of grade • For EEE591, total 20% of grade • Same letter grade assignment scale for grad and undergrad: A+ 95-100 A 90-95 A- 88-90 B+ 85-88 B 80-85 B- 78-80 C+ 75-78 C 65-75 D 50-65 E < 50 (For undergraduate)

  5. What you will learn: Analog Communications Signal in time domain Analog signals (baseband) Modulated signal (RF) Signal: Modulated signal: Signal in frequency domain X Modulated signal spectrum -f f Carrier spectrum frequency Signal spectrum -f f frequency frequency

  6. What you will learn: Analog Communications Radio Communications:Off the air TV Broadcasting: Amplitude Modulation (AM) Audio + Black & white TV Frequency Modulation (FM) Color TV

  7. What you will learn: Digital Communications • How to convert analog signal • into digital format: • Sampling theorem • Quantization of analog samples • How to send digital info: • On-off keying • PAM • PSK • FSK • QAM • Error probability • Power budgeting • Satellite • Cellular • Coding techniques Satellite Base Station Direct Broadcast Satellite TV Satellite Phone

  8. What You Will Learn: Cellular Networks 1G – Analog (Cellular, AMPS) 2G – Digital (GSM, TDMA, CDMA) 3G – Voice, video, data (WCDMA, CDMA2000) Backbone Network

  9. What is a Hertz, and in a Hertz? The concept of frequency spectrum • Signals in time can be decomposed into frequency components (Fourier transform) • A signal is called band limited if signal has frequency components within a frequency band. • Often signals are modulated to occupy different frequency bands in a large frequency spectrum • Signals can be transmitted in a wired system (copper wire, coaxial cable, fiber) • Signal can also be transmitted in a wireless system (microwave, satellite, cellular)

  10. Information source and input transducer Transmitter Receiver Output traducer and information sink Channel Analog Communications What facilitates communications? • Information transmitted over distance. (Speech, video, data) • Information often is an analog waveform for analog communication.

  11. Digital Communications What does it take to send data over a channel? • Time – More time, more bits transmitted • Frequency – More bandwidth, the faster you can transmit information • Space – The larger the transmitter and receiver, more bits transmitted • Power – The signal to noise ratio determines the number of bit per sample Fundamental equations government communication capacity: Nyquist Theorem: To reconstruct a signal band-limited to frequency f, we need only 2f samples per second. Shannon’s channel capacity: A channel of bandwidth W, transmitter power P, and noise power N0per hertz has capacity

  12. Frequency Spectrum:

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