Simulation Of Multipath Channel Radio In Wireless Local Area Network (WLAN)

Nasrul Muhaimin , Ab Rahman (2008) Simulation Of Multipath Channel Radio In Wireless Local Area Network (WLAN). Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

A wireless local area network (WLAN) is the linking of rnro or more computers without using wires. WLAN utilizes OFDM modulation technology based on radio waves to enable communication between devices in a limited area. This gives users the mobility to move around within a broad coverage area and still be connected to the network. Rayleigh fading is a statistical model for the effect of a propagation environment on a radio signal, such as that used by wireless devices. It assumes that the magnitude of a signal that has passed through such a transmission medium (also called a communications channel) will vary randomly, or fade, according to a Rayleigh distribution. In other words, the signal offered to the receiver contains not only a direct line-of-sight radio wave, but also a large number of reflected radio wave that arrive at the receiver at different time. Delayed signals are a result of reflections from terrain features such as trees, hills, mountains, vehicles, or building . These reflected delayed wave with the direct wave will cause intersymbol interference (lSI), which cause significant degradation of the network performance. So, a wireless network must be designed in such a way as to minimize these adverse effects.

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