Which of the following is the basis for cellular systems employing the code-division multiple access (CDMA)standard?
A)COFDM
B)QPSK
C)OFDM
D)DSSS

Question

Quizplus · Accepted Answer

CDMA stands for code-division multiple access, which is a method for allowing multiple users to share the same radio frequency band. The basis for this standard is direct-sequence spread spectrum (DSSS) technology, which spreads the signal over a wide bandwidth using a unique code for each user. COFDM and OFDM are used in other wireless communication standards, while QPSK is a type of modulation used in various communication systems.

Which of the Following Is the Basis for Cellular Systems