| The code division multiple access (CDMA) communication system is a wellestablished
technology in the sense that it is one of technically proven methods to
transmit voice information for multiple users via wireless communications during
the last decade. Further, CDMA is an emerging technology for next generation multimedia
information of real-time and nonreal-time traffic and various multisource
multitraffic communications environments. We have envisioned that CDMA is a
key technology to satisfy the mundane usage of information transmission, and we
are devoted to refining the definitions of capacity of the CDMA systems as the
proper analytic measure to optimize the resources. At first, we need to observe the
behavior of the voice and multimedia traffic to relate the simple measure of capacity
and the characterizing parameters of traffic, where we specifically concentrated on
the traffic activity and activity factor of the traffic. Also, sensitivity, a key issue in
system engineering, is reinterpreted for the system capacity of the CDMA system to
understand the nonideal parametric environment of system design. Once the capacity
represents the objective for the system resource, while activity is the key parameter
to represent traffic, the well-known capacity formula of an IS-95-type voice-only
CDMA system can be revisited by our language. Naturally, we can extend the
known results to general cases, including:
1. Multiple traffic cases;
2. Imperfect power control environment;
3. Delay requirements;
4. Limited system hardware resources;
5. Systems with multiple sectors and multiple frequency allocation (FA).
The CDMA system capacity is limited by the call processing algorithm and
resource management, which is further analytically investigated for practical
applications into traffic engineering, along with emerging environments. We
consider that a service may be provided efficiently under hybrid frequency division
multiple access (FDMA)/CDMA systems and the overlaying multiaccess systems,
respectively. |
