A cellular system uses FDMA with a spectrum allocation of 12.5MHz. A guard band

Question

A cellular system uses FDMA with a spectrum allocation of 12.5MHz. A guard band of 10kHz at both edges of the allocated spectrum is enabled to avoid interfering with other systems/service providers. Each frequency channel has a bandwidth of 30kHz.

(a) What is the total number of available frequency channels?

(b) Suppose that each channel is equally shared by 8 users using TDMA and that each user has a receive signal-to-interference-plus-noise ratio (SINR) of 255. What is the maximum transmission rate of each user?

Explanation / Answer

(a) Total number of available freq channels =12.5*10^3-20/30 = 1248/3 = 416 channels

(b) Max transmission rate = 30 * 255/256 = 29.88kHz

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