Consider a large cellular system and see under what conditions CDMA can provide a better performance than TDMA or vice versa. Try to vary the number of users and observe the performance under other schemes available
Answers
Answer:
TDMA
TDMA is an abbreviation of “Time-Division Multiple Access”. TDMA chops or divides the channel into sequential time portions. Users of the channel will have their respective round-robin turns in receiving and transmitting data. Breaking it down, only a single user is actually utilizing the channel at any given instance. Each user only uses the channel in short bursts at a time and that grant to use resources is given up for a while to also allow others to use the channel.
Mediavine
Actually, TDMA has been included into GSM for a very long time as it is already considered an old technology and it is beginning to become obsolete.
CDMA
CDMA is short for “Code-Division Multiple Access” and it is also a kind of multiplexing that allows several signals to use a single transmission channel.
CDMA, unlike TDMA, virtually allows numerous users to use the channel at the same time. Thus, transmitting and receiving are all done by various users simultaneously. This is only made possible by a process called Spread Spectrum, a type of modulation that captures every user’s flow of digital bits and spreads them all around the channel in a pseudo-random manner. The receiving end just interprets the scattered bits or in other words, un-randomize the bits to make them coherent
Of the two technologies, CDMA is the later one. Essentially, it emerged to resolve the inadequacies and the setbacks associated with TDMA.
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1. Their abbreviation meanings actually give light to the manner they optimize channels. TDMA is short for Time-Division Multiple Access while CDMA is for Code-Division Multiple Access.
2. TDMA emerged and was utilized first. CDMA is the more recent technology gradually replacing TDMA.
3. TDMA chops or divides the channel into sequential time portions as each user has its respective right turn for channel use.
Mediavine
4. CDMA uses a process called Spread Spectrum ‘“ scattering of digital bits in pseudo-random manner and collecting them for interpretation.
5. CDMA allows numerous users to use the channel at the same time while TDMA does not.
Explanation: