Difference Between GSM and CDMA (with Comparison Chart.
Frequency division multiple access (FDMA). Time division multiple access (TDMA). Code division multiple access (CDMA). The Advanced Mobile Phone Service (AMPS) system, the first cellular system widely used in the United States, uses FDMA. It partitions, or divides, the frequency spectrum and assigns each call a different subcarrier frequency.
There is an alternative technique: Time division multiple access (TDMA). TDMA occupies a channel but it allows two users to occupy the same channel at what appears to them to be the same time. An analogy could be the still shot frame rates in cinema, where at around 30 frames per second it gives the illusion of continuous movement but it is actually a time shuttling exercise.
Basically there are four multiple access techniques available namely, Time Division Multiple Access (TDMA), Frequency Division Multiple access (FDMA), Code Division Multiple Access (CDMA) and Space Division Multiple Access (SDMA). MAT is employed in terms of fixed time slots, fixed subchannels, and unique codes in TDMA, FDMA and CDMA respectively. SDMA makes use of the spatial separation of.
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