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Reflection and scattering from rough surfaces

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Propagation of Radiowaves — Recommend this title to your library

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Radiowaves are reflected by the ground and from objects such as buildings. This can have various effects on radio systems. Reflections from buildings, etc., can permit a radio service to exist where the signal would otherwise be excessively attenuated by shadowing. Conversely, reflections can cause interference where shadowing alone would provide adequate attenuation of an unwanted signal. Reflections are also a major cause of multipath propagation. This can sometimes be exploited, particularly in a mobile radio system using code division multiple access (CDMA). For point-to-point links, on the other hand, ground reflections are generally viewed as an impairment, and every effort is made to minimise their effect.

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