=== Code Division Multiple Access ===
There is no restriction on time and frequency in this scheme. All the users can transmit at all times and at all frequencies. Because users are isolated by code, they can share the same carrier frequency, eliminating the frequency reuse problem encountered in other technologies.
[[Image:cdma11.jpg|thumb|600 px|centre|CDMA]]<br>
A comparative study between the above three access technologies with respect to time and frequency is as shown below.
[[Image:cdma12.jpg|thumb|600 px|centre|Comparison of cellular access schemes]]
==Code Division Multiple Access==