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Given a RF sender and a receiver, suppose the obstacles between them are fixed, both their material and dielectric properties, does the path loss caused by their shadowing vary? If yes, what causes the variation? If not, why is it generally modeled as a log-normal random variable? We can assume there is only one path between the sender and receiver if this simplifies the question.

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Hi Sino. Welcome to Physics.SE Please keep in mind that, "Your user card sticks with every single post of yours". So, please don't add your special signatures along with your posts. –  Waffle's Crazy Peanut Mar 25 '13 at 19:06
    
@CrazyBuddy Thanks for the reminder. –  sinoTrinity Mar 26 '13 at 0:50

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