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If 20MHz of total spectrum is allocated for a duplex wireless cellular system and each simplex channel has 25Khz RF bandwidth,

find the number of duplex channels and the total number of channels per cell if

i) N=4 cell reuse is used.

ii) N=12 cell reuse is used.

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Total bandwidth = $20 MHz$

Channel Bandwidth = $25 \ KHZ * 2 \ simplex \ channels$

= $50 \ KHz$

Therefore

Total number of duplex channels= $\frac{20,000}{50}$

= $400 Channels$

(i) N=4 cell reuse

Total no of channels available per cell = $\frac{400}{4}$

= $100 Channels$

(ii) N=12 cell reuse

Total no of channels available per cell = $\frac{400}{12}$

= $33 (approx) \ Channels$

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