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                           <rdf:li><rdf:Description xmpDM:name="Frequencies Signals, antennas, signal propagation, MIMO Multiplexing, Cognitive Radio Spread spectrum, modulation Cellular systems Mobile Communications Chapter 2: Wireless Transmission" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prof." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="File:Rainbow-gradient-fully-saturated.svg" xmpDM:startTime="38600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description 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frequencies in" xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="UHF to SHF range some systems planned up to EHF limitations due to absorption by, e.g.," xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="water (dielectric heating, see microwave oven) weather dependent fading, signal loss caused by heavy rainfall etc." xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prof." xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="248267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Frequencies and regulations Examples Europe USA Japan Cellular networks GSM 880-915, 925-960, 1710-1785, 1805-1880 UMTS 1920-1980, 2110-2170 LTE 791-821, 832-862," xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="2500-2690 AMPS, TDMA, CDMA, GSM 824-849, 869-894 TDMA, CDMA, GSM, UMTS 1850-1910, 1930-1990 PDC, FOMA 810-888, 893-958 PDC 1429-1453, 1477-1501" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="FOMA 1920-1980, 2110-2170 Cordless phones CT1+ 885-887, 930-932 CT2 864-868 DECT 1880-1900 PACS 1850-1910, 1930-1990 PACS-UB 1910-1930 PHS 1895-1918 JCT" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="245-380 Wireless LANs 802.11b/g" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="2412-2472 802.11b/g" xmpDM:startTime="560800" 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xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="see e.g." xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="3GPP TS 36.101" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="V16.5.0" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="(2020-03)" xmpDM:startTime="560800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Great flexibility with LTE See, e.g.," xmpDM:startTime="1156333" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="en.wikipedia.org/wiki/LTE_frequency_bands" xmpDM:startTime="1156333" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="or 3GPP TS 36.101" xmpDM:startTime="1156333" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E-UTRA: User Equipment (UE) radio transmission and reception Prof." xmpDM:startTime="1156333" 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xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="1698533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="1698533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="1698533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications 1 0 1 0 t t ideal periodic signal real composition (based on harmonics)" xmpDM:startTime="1698533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Real technical systems are always bandwidth-limited Prof." xmpDM:startTime="1989900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="1989900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="1989900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="1989900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications frequency [Hz] attenuation bandwidth threshold 0" xmpDM:startTime="1989900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Signals II Different representations of signals amplitude (amplitude domain) frequency spectrum (frequency domain) constellation diagram (amplitude M and phase " xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="in polar coordinates) Composed signals transferred into frequency domain using Fourier transformation Digital signals need infinite frequencies for perfect transmission" xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="modulation with a carrier frequency for transmission (analog signal!) Prof." xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications f [Hz] A [V]  I= M cos  Q = M sin   A [V] t[s]" xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="2360733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Antennas: isotropic radiator Radiation and reception of electromagnetic waves, coupling of wires to space for radio transmission Isotropic radiator: equal" xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="radiation in all directions (three dimensional) - only a theoretical reference antenna Real antennas always have directive effects (vertically and/or" xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="horizontally) Radiation pattern: measurement of radiation around an antenna Prof." xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications z y x z y x ideal isotropic radiator" xmpDM:startTime="2740733" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Antennas: simple dipoles Real antennas are not isotropic radiators but, e.g.," xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="dipoles with lengths /4 on car roofs or /2 as Hertzian dipole  shape of antenna proportional to wavelength Example:" xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Radiation pattern of a simple Hertzian dipole Gain: maximum power in the direction of the main lobe compared to the" xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="power of an isotropic radiator (with the same average power) Prof." xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications side view (xy-plane) x y side view (yz-plane) z y top view (xz-plane) x z simple dipole /4" xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="/2" xmpDM:startTime="2935700" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Antennas: directed and sectorized Often used for microwave connections or base stations for mobile phones (e.g.," xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="radio coverage of a valley) Prof." xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications side view (xy-plane) x y side view (yz-plane) z y top view (xz-plane) x z top view, 3" xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="sector x z top view, 6 sector x z directed antenna sectorized antenna" xmpDM:startTime="3197633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Antennas: diversity Grouping of 2 or more antennas multi-element antenna arrays Antenna diversity switched diversity, selection diversity receiver chooses antenna" xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="with largest output diversity combining combine output power to produce gain cophasing needed to avoid cancellation Prof." xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications + /4 /2 /4 ground plane /2 /2 + /2" xmpDM:startTime="3354600" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="MIMO Multiple-Input Multiple-Output use of several antennas at receiver and transmitter increased data rates and transmission range without additional transmit" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="power or bandwidth via higher spectral efficiency, higher link robustness, reduced fading Examples IEEE 802.11n," xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="LTE, HSPA+, … Functions “beamforming”: emit the same signal from all antennas to maximize signal power at receiver antenna spatial" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="multiplexing: split high-rate signal into multiple lower rate streams and transmit over different antennas diversity coding: transmit single stream over" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="different antennas with (near) orthogonal codes Prof." xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications sender receiver t1 t2 t3 Time of flight t2=t1+d2 t3=t1+d3 1 2 3 Sending time 1: t0 2:" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="t0-d2 3: t0-d3" xmpDM:startTime="3624633" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Questions &amp; Tasks Frequency regulations may differ between countries." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Check out the regulations valid for your country (within Europe CEPT may be able to help you, https://www.cept.org/," xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="for the US try the FCC, www.fcc.gov," xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="for Japan ARIB, www.arib.or.jp)." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Why can waves with a very low frequency follow the earth’s surface? Why are they not used for data transmission" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="in computer networks? Why does the ITU-R only regulate ‘lower’ frequencies (up to some hundred GHz) and not higher frequencies" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="(in the THz range)? What are the two different approaches in regulation regarding mobile phone systems in Europe and the" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="US? What are the consequences? Why is the international availability of the same ISM bands important? Is it possible to" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="transmit a digital signal, e.g.," xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="coded as square wave as used inside a computer, using radio transmission without any loss? Why? Is a directional antenna" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="useful for mobile phones? Why? How can the gain of an antenna be improved? If you are unsure about Shannon," xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Nyquist etc." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="– go back to our Computer Networks lecture and refresh your knowledge! Prof." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Dr.-Ing." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Jochen H." xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Schiller www.jochenschiller.de" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Mobile Communications" xmpDM:startTime="3933267" xmpDM:duration="1000"/></rdf:li></rdf:Seq>
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