radio propagation path loss shadowing multipath fading, isi dr. dóra maros
TRANSCRIPT
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Radio propagationPath loss
ShadowingMultipath fading, ISI
Telecommunication
Dr. Dóra Maros
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GSM
Cells
Earth Cell(satelite)
MacrocellSize: 350m-20 kmOutdoor, rural, roads
MicrocellSize: 50m-300 mOutdoor, city
PicocellSize: some 10 mIndoor
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GSM
Radio Propagation in Mobile Networks
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GSM
GSM 900, 1800, 1900 bands (2G)
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GSM
Duplexing Uplink Downlink Bandwidth
UMTS-FDD 1920 - 1980 MHz 2110 - 2170 MHz 60 + 60 MHz
UMTS-TDD 1900 - 1920 MHz UL/DL2010 - 2025 MHz
UL/DL20 + 15 MHz
Satelite 1980 - 2010 MHz 2170 - 2200 MHz 30 + 30 MHz
in 2000, new frequency bands 806 - 960 MHz, 1710 - 1885 MHz (GSM
bands!) 2500 - 2690 MHz
DEC
TGSM1800
1800 1900 2000 2100 2200 2500 2600 2700
UMTSFDD
Műhold
UM
TS
TD
D
UM
TS
TD
D
UMTSFDD
Műhold
UMTS
[MHz]
Paired fr. bands
Unpaired fr. bands
Channel bandwidth: 5,10, or 20 MHz
UMTS Frequency Bands
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GSM
30 bands:21 FDD9 TDD
LTE Bands
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GSM
GSM antennas
Adjustable antennas
Directional Antennas
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GSM
Omni antenna mounted on mobile tower
„Handy” omni antenna
Omni antennas
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GSM
Micro antennas: connections towards the core network (some ten GHz)
Microwave Antennas
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GSM
MIMO antennas (LTE)
Multiple sector
antennas in the same cell
3G/4G Antennas
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GSM
Indoor Antennas (examples)
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GSM
The wavelength is inversly proportional to the frequency of elektromagnetic wave :
λ = c/f, where
λ - wavelength (m)c - velocity of electromagnetic wave (in vacuum and in the air about 3*108 m/s, accurate value: 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] 2. f=2,6 GHz (2,6*109)
3*108 / 2,6*109 = 1,154 * 10-1 ~ 0,1154 [m]
Radio propagation I. Frequency and wavelength
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GSM
RSL Received
Signal Level (dB)
d (distance from antenna)
Free space attenuation:
a0 = 20 log (4Πd/λ)
a0 = 20 log (df) + 28,14
Radio propagation II. Path loss
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GSM
Makrocell propagation models:Relative small traffic (rural, road), high speed of movement (>100 km/h)
Hata, COST231
Mikrocell propagation models:High traffic (urban, suburban), smaller speed of movement (30-80 km/h)Walfish-Ikegami modell, COST 231
Indoor propagation models:Mootley-Keenan (félempirikus)Ray-tracing
Radio Propagation III. Propagation Models
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GSM
RSL (dB)
Mean value
Slow fading caused by shadowing
Radio Propagation IV. Shadowing
d (distance from antenna)
Base Station
Mobile Equipment
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GSM
Fast fading caused by reflections
Radio Propagation V. Multipath Fading
Base Station Mobile Equipment