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Standard deviation for shadowing is 3.65 dB.
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We have considered independent lognormal random variables with a standard deviation of 8 dB for shadowing.
Figure 2 SER performance versus the relay placement with different standard deviations of shadowing.
Figure 3 SER performance versus the power allocation factor with different standard deviations of shadowing.
First, we derive an upper bound of symbol error rate (SER) for DF cooperative relaying over correlated lognormal shadowed Rayleigh fading channels with M-phase-shift keying (PSK) modulation, which shows how the correlation coefficients and the standard deviations of shadowing impact the SER performance.
The standard deviation of the shadowing loss is 10 dB.
The standard deviation of shadowing is 8 dB.
Since a larger correlation coefficient or standard deviation of shadowing means worse link quality, we conclude that the relay should be placed more closely to the node with a larger correlation coefficient and standard deviation of shadowing so as to compensate for the loss of the link quality.
Besides that, the standard deviation of shadowing shows a great influence on the distribution of ICI.
These include the values of the path loss exponent and the standard deviation of shadow fading for macro and pico BSs, along with their transmitted power levels.
In addition, the values of exponent for path loss formula and standard deviation for log-normal shadow fading set to 2.8 and 6.0, respectively.
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