(10.16) A receiver in an urban cellular radio system detects a 1 mW signal at d=
ID: 1922254 • Letter: #
Question
(10.16) A receiver in an urban cellular radio system detects a 1 mW signal at d= d0=1 meter from the transmitter. In order to mitigate co-channel interference effects, it is required that the signal received at any base station receiver from another base station transmitter which operates with the same channel must below -100dBm. A measurement team has determined that the average path loss exponent in the system isn n= 3. Determine the major radius of each cell if a seven-cell reuse pattern is used. What is the major radius if a four cell reuse pattern is used?Explanation / Answer
P0[dBm] = 0; Pr[dBm] = ¡100; n = 3; d0 = 1m
Pr[dBm] = P0[dBm] -10 x n x log ( d/d0)
d = 10 {(P0[dBm]¡Pr[dBm])/ (10xn)} = 2154.4m
Now, d is the minimum distance between same frequency cells so they do not interfere with each other, and because
R = d/Q= d/3N
we obtain for (b) N = 4 )>> R =622m, (a) N = 7 >> R = 470m
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