In the not-too-distant future the moon is colonized and you are chosen to build

Question

In the not-too-distant future the moon is colonized and you are chosen to build a wireless communications infrastructure. The entire radio-frequency spectrum is open and at your disposal! You can choose a TDMA, FDMA, or CDMA architecture for your system. Here are the specifications for your system: There is a defined number of users; none will be added later The users must be able to communicate at any time they choose There can be no interference between users Which system do you choose, and why?

Explanation / Answer

as there is defined number of users and none will be added later, FDMA is the most appropriate system to chose. the entire bandwidth can be divided into multiple channels and as we know the total number of users, we can set the bandwidth of each channel in such a manner that there won't be any interference of any signals between users. With the help of it, users will be able to communicate at any time they want. there is no time limitation.

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