(a) For acceptable performance, the signal-to-CCI ratio must be at least 14dB if
ID: 2266038 • Letter: #
Question
(a) For acceptable performance, the signal-to-CCI ratio must be at least 14dB if v=3.5
(b) If the signal power received is-75dBm for the frequency reuse pattern you have determined from the above question ,find the value of the CCI?
(c) If the ACI is-117dBm, and the thermal noise power is -122dBm, for the above signal power the power and the above CCI, find the overall signal-to-noise-plus-interference ratio
(a) For acceptable performance, the signal-to-CCI ratio must be at least 143 ir (b) If the signal power received is-75d (c) If the ACI is-117dBm, and the thermal noise power is -122dBm, for the above the minimum number of frequency reuse for a cellular s ystem. Bm, for the frequency reuse pattern you have determined from the above question, find the value of the CC above signa power and the above CCI, find the overall signal-to-noise-plus-interference ratioExplanation / Answer
a) Given,
Signal to CCI ratio is 14dB
frequency re-use ratio q = sqrt(3*N)
S/I = (1/6) *q^k where k = 2
14 = (1/6) * ( sqrt(3*N))^2
14*6 = 3*N
14*2 = N
N = 28.
b) Signal to CCI ratio = (1/6) *q^k
q = sqrt(3*N)
= sqrt(3*28)
q = 9.16515
S = -75dBm ( 1dBm = 10log(dB))
S = 1.875dB
1.875 / CCI = (1/6) * q^k
1.875 / CCI = (1/6) *83.9999
1.875 / CCI = 13.99999
CCI = 0.1339dB = -8.7dBm
c) Thermal noise power P(dBm) = -122dBm
ACI(dBm) = -117dBm
Overall power = -122-117dBm = -239dBm
S/N = -75dBm / -122dBm = 0.61475
ACI/CCI = -117dBm/ -8.7dBm
= 13.4482
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