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New Standards for Wireless LANs

New Standards for Wireless LANs

Pathloss in Free Space

Pathloss in Free Space • Received power depends on frequency, transmitted power, antenna gains, distance and constants only P L L F R = P T ⎛ ⎜ ⎝ λ 4πd ⎞ ⎟ ⎠ • EIRP: effective isotropic radiated power: – EIRP = P T G T 2 P ( dB) = 10log P ( dB) = 10log G R T G T T G R F f : Frequency [Hz] + 10logG R - 32 - P G λ : d T / R T / R : : − 20log transmitted : Antenna Gain Transmitter/Receiver Wavelength[m] Distance[m] f / received − 20log d Power + 147. 56 TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

Attenuation of different frequencies ● Attenuation depends on the used frequency ● Can result in a frequency-selective channel ― If bandwidth spans frequency ranges with different attenuation properties Attenuation - 33 - moderate rain fog / clouds strong rain molecular dispersion frequency TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

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