Consider a gsm uplink. the ms has 100 mw transmit power and the sensitivity of the bs receiver is -105 dbm.the distance between the bs and ma is 500 m.the propagation law follows the free space law up to a distance of dbreak=50m and for larger distances the receive power is similar to (d/dbreak)^-4.2. The transmit antenna gain is -7db the receive antenna gain is 9db. compute the fading margin