4 years ago

New Standards for Wireless LANs

New Standards for Wireless LANs

Atmospheric attenuation

Atmospheric attenuation (dB/km) 10 1 0.1 0.01 Attenuation in Atmosphere 10 20 40 60 80 100 300 f (GHz) - 34 - vapor oxygen David Benkner: Digitale Mobilfunksysteme TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

• Signal can take many different paths between sender and receiver due to reflection, scattering, diffraction signal at sender Multipath Propagation • Time dispersion: signal is dispersed over time interference with “neighbor” symbols, Inter Symbol Interference (ISI) • The signal reaches a receiver directly and phase shifted distorted signal depending on the phases of the different parts - 35 - LOS pulses multipath pulses signal at receiver TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

IEEE 802.11: moving closer to practical wireless LANs
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