Physics, asked by tanvir3886, 1 year ago

State typical applications of CDMA systems.

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Answered by vedprakashpal3p57skg
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Answer:

Application of CDMA

CDMA is much more efficient as compared to FDMA or TDMA as it increases network capacity five to six times compared to the other two. Along this the power controlled CDMA gives enhanced system throughput as compared to power controlled protocols in non-spreading systems. This is due to the fact that in a non-spreading case, the W/R ratio is unity (see eqn. 1) (as R equals W here) and Eb/I0 is equal to the ratio of the total signal power received divided by the total interference power received due to the other users in the network and the background thermal noise while in the CDMA, the W/R ratio is much greater than unity because of the spreading of signal . So from Eqn. 1, we can see that the received signal-to-interference ratio is multiplied by the factor of W/R. Since minimum required Eb/I0 ratio for correct reception is typically a fixed number depending on the basis of receiver design, the tolerance level of the receiver increases because the signal power is multiplied by the processing gain. Hence, the receiver is able to decode packets which otherwise would not have been received correctly. This allows more number of simultaneous transmissions in single hop area for adhoc network. Thus power controlled CDMA MAC for adhoc networks combines the advantages of both variable transmission range protocols as well as spread spectrum multi-access communication.

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