Code Division Multiple Access
To solve the inherent failings
of TDMA and FDMA, one must devise a technique to utilize system resources efficiently.
The innovation of Code Division Multiple Access (CDMA) solves the problem of
wasting idle resources. The system allots the entire available frequency spectrum
to each user and allows the users the ability to transmit over all time. In
order to distinguish one user transmission from the next, a code is assigned
to each user signal data bit. This code maintains a faster bit-rate than the
user signal. Using the designated code, receivers decipher only the desired
signal from the network traffic. In doing so, it regards all other signals as
noise.