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A17.11.2 A17.11.2

The mean path loss is characterised by a dual-slope model with a break point d_BP, an exponent of 2 for all distances less than d_BP, and an exponent of 3.5 otherwise. In short, the mean path loss, L, in dB is

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body $L\left( d \right)=\left\{ \begin{array}{*{35}{l}} {{L}_{FS}}\left( d \right) & \left[ dB \right] & d<{{d}_{BP}} \\ {{L}_{FS}}\left( {{d}_{BP}} \right)+35\times \log \left( \frac{d}{{{d}_{BP}}} \right) & \left[ dB \right] & d\ge {{d}_{BP}} \\ \end{array} \right.$

    (Eq. 243)

where d is the separation between the transmitter and receiver in kilometres, d_BP = 0.005 is the break-point in km (i.e. 5 m), and L_FS is free space path loss.

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body ${{L}_{FS}}=32.4+10\times {{\log }_{10}}\left( \frac{{{\left( {{h}_{Tx}}-{{h}_{Rx}} \right)}^{2}}}{{{10}^{6}}}+{{d}^{2}} \right)+20\times {{\log }_{10}}\left( f \right)$

    (Eq. 244)

where h_Tx and h_Rx are the height of the transmitter (Tx) and receiver (Rx) respectively and are expressed in m. d is the distance between the Tx and Rx and is expressed in km. f is the frequency and is expressed in MHz.

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T092 T092

Table 92: IEEE 802.11 Model C (modified) propagation model

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