Basic Consep of Radio Wave

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Presentation transcript:

Basic Consep of Radio Wave Politeknik Telkom 2008

Radio wave element Propagation channel Multipath channel Fading

Fading Klasifikasi fading Large scall fading Small scale fading Mengatasi fading : fading margin  menaikkan daya pemancar diatas level threshold

Communication system model

Increase transmitter quality Maximize power Raise height of antenna. Maximize antenna gain Attenuate cable loss

Increase receiver quality Maximize antenna gain Diversity methods Attenuate cable loss Attenuate noise

Diversity Space diversity Frequency diversity

Space diversity

Analog Modulation FM (Frequency Modulation) AM (Amplitude Modulation)

AM

FM

Digital Modulation ASK (Amplitude Shift Keying) FSK (Frequency Shift Keying) PSK (Phase Shift Keying)

ASK

FSK

PSK

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