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Wireless Systems IK1330

Wireless Systems IK1330. Anders Västberg vastberg@kth.se 08-790 44 55. IK1330 Wireless Systems. INL1: 4.5 hec (A-F) Three case studies, poster presentations and opposition reports SEM1: 1.5 hec (P/F ) 6 seminars, compulsory participation, homework and assimilation problems

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Wireless Systems IK1330

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  1. Wireless SystemsIK1330 Anders Västberg vastberg@kth.se 08-790 44 55

  2. IK1330 Wireless Systems • INL1: 4.5 hec (A-F) • Three case studies, poster presentations and opposition reports • SEM1: 1.5 hec (P/F) • 6 seminars, compulsory participation, homework and assimilation problems • LABA: 1.5 hec. (P/F) • Two labs: Propagation measurements, Cellular planning • Required reading: • Stallings, W., Wireless Communications and Network, Pearson, 2005 • Course Webpage: • http://www.kth.se/social/courses/IK1330 • Book Webpage: • http://williamstallings.com/Wireless/Wireless2e.html

  3. IK1330 Wirless Systems • Learning outcomes This course provides an overview of wireless systems. It describes the basic design of radio links and radio networks, and describes the system architecture and function of different existing standards for wireless systems. To pass, the student should be able to: • Give an overview how a fading radio channel affects the link performance of wireless communication systems. • Dimensioning a radio link in terms of range and channel capacity based on given conditions • Explain how multiple access methods works. • Calculate the capacity of radio networks using simple models • Give an overview of the system architecture of the various existing wireless communication systems. For the highest grade, the student should be able to: • Explain wave propagation mechanisms and make judgments based on how these mechanisms affect the wave propagation. • Solve a general design problem for the radio links and radio networks by using simple formulas • Give an overview of various existing systems for wireless communications and compare the capacity and performance of them. Fulfilling parts of the learning outcomes of the highest grade results in grades D to B.

  4. Feisel-Schmitzstaxanomy • Define (Beskriva) • Calculate (Beräkna, Dimensionera … med givnaförutsättningar) • Explain (Förklara) • Solve (Lösa, analysera) • Judge (Görabedömningar, Jämföra)

  5. IK1330 Wireless Systems • Channel capacity, transmission, multplexing • Antennas, wave propagation, fading, • Digital Modulation, • Spread spectrum FHSS, DSSS, • Multiple access FDMA, TDMA, CDMA, OFDMA, • Error detection and error correction, • Wireless networks standards for cellular and mobile broadband systems, wireless LAN, sensor networks and PAN.

  6. Outline of the course • Introduction (chapter 1) • Part one: • Transmission fundamentals (chapter 2) • Part two: • Antennas and Propagation (chapter 5) • Signal encodingtechniques (chapter 6) • Spreadspectrum (chapter 7) • Coding and errorcontrol (chapter 8) • Channel Capacity (chapter 2)

  7. Outline of the course • Part three: • Satellite communcation (chapter 9) • Cellular wireless networks (chapter 10) • Cordless systems and Microwave links (chapter 11) • Part four: • WLAN (802.11/Wi-Fi) (chapter 13, 14) • Bluetooth / ZigBee / Sensor networks (chapter 15)

  8. Radio Communication • Radio or radio communication means any transmission, emission, or reception of signs, signals, writing, images, sounds or intelligence of any nature by means of electromagnetic waves of frequencies lower than three thousand gigacycles per second (3000 GHz) propagated in space without artificial guide. • Examples of radio communication systems: • Radio broadcasting. • TV broadcasting. • Satellite communication. • Mobile Cellular Telephony. • Wireless LAN. • Multimedia communication & Mobile Internet [Slimane]

  9. Electromagnetic Waves [NE]

  10. History • 1864: Maxwell describes radio wave mathematically • 1888: Hertz generates radio waves • 1896: Marconi makes the first radio transmission • 1915: Radio tubes are invented • 1948: Shannon’s law • 1948: Transistor • 1960: Communication Satellites • 1981: Cellular technology

  11. Classification of radio spectrum

  12. The Radio Spectrum • The frequency spectrum is a shared resource. • Radio propagation does not recognize geopolitical boundaries. • International cooperation and regulations are required for an efficient use of the radio spectrum. • The International Telecommunication Union (ITU) is an agency, within the UN, that takes care of this resource. • Frequency assignment. • Standardization. • Coordination and planning of the international telecommunication services.

  13. Higher Carrier Frequency: • Shorter Range = c/f • Higher Channel Capacity

  14. Radio Communication • Three main problems: • The path loss • Noise • Sharing the radio spectrum

  15. Current Problems • Energy efficiency • energy consumption at today's level while we can see a 1000-fold increase in traffic volume to 2020. • reduce operational cost • minimized RF emission • ”Revenue Gap” • Scalability (Internet ofThings) • billions of devices • ubiquitous services

  16. Evolution of Wireless Systems [Stallings., 2005]

  17. Evolution of Cellular Systems AMPS D-AMPS IS-136 CDPD TD-SCDMA TACS GSM GPRS EDGE WCDMA UTMS NMT CDMA IS-95 CDMAone IS-95B CDMA2000 1G (Analog) 2G (Digital) 2.5G (Packet) 3G [Slimane]

  18. Evolution of Cellular Systems (UTRA) WCDMA UTMS HSDPA HSPA-evolution LTE 3G 3.5G 4G

  19. LTE-Long Term Evolution • High spectral efficiency • Very low latency • Support of variable bandwidth • Simple protocol architecture • Simple Architecture • Compatibility and inter-working with earlier 3GPP Releases • Inter-working with other systems, e.g. cdma2000 • FDD and TDD within a single radio access technology

  20. Other Technologies • WLAN (IEEE 802.11) • Bluetooth • Sensor networks (ZigBee and IEEE 802.15.4)

  21. Communication Systems Message signal Source of information Transmitter Transmitted signal Channel Estimate of message signal Received signal Receiver Information sink [Ahlin et. al., 2006]

  22. Analog Communication System Source of information Signal Processing Modulator RF-Stage Channel Information sink Signal Processing Demodulator RF-Stage [Slimane]

  23. Digital Communication System Source of Information Source Encoder Channel Encoder Digital Modulator Modulator RF-Stage Channel Information Sink Source Decoder Demodulator RF-Stage Channel Decoder Digital Demodulator [Slimane]

  24. UppgifterinförF2 • Ta redapåformelnförattbyta bas på en logaritm (kursenimatematiskanalys) ochlösföljande: • Beräkna

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