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For free space {XE "Propagation model:Free space" } model the path loss is defined by:
Mathinline body $L=32.4+10{{\log }_{10}}\left( {{\left( \frac{\left( {{h}_{tx}}-{{h}_{rx}} \right)}{1000} \right)}^{2}}+d_{{}}^{2} \right)+20{{\log }_{10}}f$
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(Eq. 189)
comment:
the equation has been modified
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