ACS-2009-03 - Lecture topics Classification of radiowaves...

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1 Lecture topics: Classification of radiowaves The mobile radio propagation environment Introduction to radio link engineering Free-space propagation model Okumura method Okumura – Hata’s model MATLAB example of Hata’s model
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2 The Earth’s atmosphere
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3 The Earth’s atmosphere: Around 30 MHz, a significant shift in the propagation behaviour of radiowaves takes place. Below that frequency, the atmosphere “traps” radio waves by reflecting it back to the Earth’s surface. Above that frequency, radiowaves begin to escape the atmosphere to the outer space. The 30 MHz is defined as the start of the Very-High Frequency (VHF) range
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4 Classifications:
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5 Radiofrequency bands:
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6 Classifications of radiowave:
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7 Radiowave attenuation by oxygen and water vapour at sea level: T = 20 o C Water content = 7.5 g/m 3
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8 Mobile radio propagation environment:
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9 Radio link engineering: Radio link engineering problems are two kinds: Analysis – what is the RF field strength at a location of a given distance from a transmitter? Synthesis – where should a transmitter be located in order to produce a required level of RF field strength at a given location within a service area?
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