1 / 16

Telecommunication

Dr. D óra Maros. Telecommunication. Radio propagation Path loss Shadowing Multipath fading , ISI. Cells. Earth Cell ( satelite ). Macrocell Size : 350m-20 km Outdoor , rural , roads. Microcell Size : 50m-300 m Outdoor , city. Picocell Size : some 10 m Indoor.

abby
Download Presentation

Telecommunication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dr. Dóra Maros Telecommunication Radiopropagation Pathloss Shadowing Multipathfading, ISI

  2. Cells EarthCell (satelite) Macrocell Size: 350m-20 km Outdoor, rural, roads Microcell Size: 50m-300 m Outdoor, city Picocell Size: some 10 m Indoor

  3. RadioPropagationin Mobile Networks

  4. GSM 900, 1800, 1900 bands(2G)

  5. UMTS GSM1800 DECT UMTS TDD UMTSFDD Műhold UMTS TDD UMTSFDD Műhold [MHz] 2100 2200 2500 2700 1800 1900 2000 2600 UMTS FrequencyBands • in2000, newfrequencybands • 806-960 MHz, 1710 - 1885 MHz (GSM bands!) • 2500 - 2690 MHz Channelbandwidth: 5,10, or20 MHz Pairedfr. bands Unpairedfr. bands

  6. LTEBands 30 bands: 21 FDD 9 TDD

  7. DirectionalAntennas Adjustableantennas GSM antennas

  8. Omniantennas Omni antenna mountedon mobile tower „Handy” omni antenna

  9. MicrowaveAntennas Micro antennas: connectionstowardsthecorenetwork (sometenGHz)

  10. 3G/4G Antennas Multiplesectorantennasinthesamecell MIMO antennas(LTE)

  11. IndoorAntennas (examples)

  12. RadiopropagationI. Frequency and wavelength • The wavelength is inverslyproportionaltothefrequency of elektromagneticwave : • λ = c/f, where • λ- wavelength(m) • c - velocity of electromagneticwave • (invacuum and inthe air about 3*108 m/s, accuratevalue: 299792458 m/s) • f - frequency(Hz) • Example: • 1. f=900 MHz (9*108 Hz) λ=? • 3*108 / 9*108 = 3/9 [m] ~ 0,33 [m] • f=2,6 GHz (2,6*109) • 3*108 / 2,6*109 = 1,154 * 10-1 ~ 0,1154 [m]

  13. Radiopropagation II. Pathloss Free spaceattenuation: RSL ReceivedSignalLevel (dB) a0 = 20 log (4Πd/λ) a0 = 20 log (df) + 28,14 d (distancefrom antenna)

  14. RadioPropagationIII. PropagationModels • Makrocellpropagationmodels: • Relativesmalltraffic (rural, road), highspeed of movement (>100 km/h) • Hata, COST231 • Mikrocellpropagation models: • Hightraffic (urban, suburban), smallerspeed of movement (30-80 km/h) • Walfish-Ikegami modell, COST 231 • Indoorpropagation models: • Mootley-Keenan (félempirikus) • Ray-tracing

  15. RadioPropagationIV. Shadowing BaseStation Mobile Equipment Meanvalue RSL (dB) d (distancefrom antenna) Slowfadingcausedbyshadowing

  16. RadioPropagationV. MultipathFading Mobile Equipment BaseStation Fastfadingcausedbyreflections

More Related