EAN: 9783960671268

DEVELOPMENT OF FIELD PROPAGATION MODEL FOR URBA...

Wireless communication is one of the most dynamic and vibrant areas of technology development
in the communication field today. It has been found that severe climatic conditions disturb the
propagation of electromagnetic signals at higher frequencies (greater than 30 MHz). The
disturbance is mainly due to molecular absorption by oxygen for frequencies ranging between 60
and 118 GHz and due to water vapour in 22  183 and 325 GHz bands. Rain and fog has the most
significant impact  since the size of the rain drops is of the order of the wavelength of the
transmitted signal. This results in energy absorption by the rain drops themselves  and as a
secondary effect energy is scattered by the drops. The frequency selective absorption
characteristics of the atmosphere can be approximated by a transfer function. In most of the
practical channels when the signal propagates through the atmosphere the effect of many factors
on the signal has to be considered along with the free space propagation channel assumption.
The main objective of this study is  therefore  to find out whether  and how  the different
climatic conditions are influencing radio wave propagation in GSM frequency bands in general
and in Narnaul  Haryana (India) in particular. To carry out this investigation  the records of
radio wave propagation along with path loss during different climatic conditions have been
analyzed. On the strength of these analyses  a propagation path loss model has been developed
by proposing suitable correction factors due to different climatic conditions. The validation
of this developed path loss model has been verified by taking reference models and by applying
practically in different urban areas. The effect of these climatic conditions on the link
budget has also been analyzed.

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