1.

What type of multiplexing is widely used in cellphones?(a) Time division multiplexing(b) Frequency division multiplexing(c) Code division multiplexing(d) Spatial multiplexingI got this question during an online interview.This question is from Frequency Division Multiplexing in chapter Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer»

Right answer is (c) Code division MULTIPLEXING

The explanation is: Another form of MULTIPLE accesses is known as code-division multiple access (CDMA). It is widely used in cell phone SYSTEMS to allow many cell phone subscribers to use a common bandwidth at the same time. This SYSTEM uses special codes assigned to each user that can be identified. CDMA uses a technique called spread spectrum to make this type of multiplexing POSSIBLE.



Discussion

No Comment Found

Related InterviewSolutions