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the channel gain, G between a transmitter v and a receiver u, is composed of distance-dependent path loss, log-normal shadowing, and channel variations due to frequency-selective fading.
G=H^2*10^((-L(d)+X)/10)
where H accounts for the channel transfer factor between transmitter and receiver, L(d) is the distance-dependent path loss (in dB), and X is the log-normal shadowing value(in dB) with standard deviation delta. the delay profiles are used to generate the frequency-selective fading channel transfer factor H.
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