Compare CDMA, FDMA & TDMA in terms of concept, key resources, sharing of resources, bandwidth, system flexibility and system complexity.

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Parameter	CDMA	FDMA	TDMA
Concept	Every bit of a conversation is been tagged with a specific and unique code.	It is a technology by which the total bandwidth available to the system is divided into frequencies. This division is done between non overlapping frequencies that are then assigned to each communicating pair	In TDMA the division of calls happens on time basis. The system first digitizes the calls, and then combines those conversations into a unified digital stream on a single radio channel.
key resources	Codes	Frequency	ActiveTime period
Sharing of resources	Sharing of resources is done through codes (PN sequence)	In FDMA each user is allotted a frequency, through which communication can be done all the time	In TDMA total available frequency is given to user for a particular time period
bandwidth	here entire bandwidth is shared among different users by assigning unique codes	here entire band of frequencies is divided into multiple RF channels/carriers. Each carrier is allocated to different users.	here entire bandwidth is shared among different subscribers at fixed predetermined or dynamically assigned time intervals/slots.
System flexibility	Flexible System	Less flexible than TDMA & CDMA	Less flexible than CDMA, More Flexible than FDMA
System complexity	Complex system	Less Complex than TDMA & CDMA	Less Complex than CDMA, More Flexible than FDMA

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