Oh! I just forget to answer your question.
This problem is my research work, not a mathematic class.
Clim : required channel capacity for MIMO (Multiple Input Multiple Output) transmission scheme.
dx : cross point distance between the channel capacity in direct link and relay link.
dR : optimum position to place a relay node.
other variables also have meaning but as for Mathematicien, the meaning of those variables are not so important, then just skip for short.
Thank you so much.
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