Book: CDMA Systems Capacity Engineering
Publisher: Artech House Publishers
The code division multiple access (CDMA) communication system is a wellestablishedtechnology in the sense that it is one of technically proven methods totransmit voice information for multiple users via wireless communications duringthe last decade. Further, CDMA is an emerging technology for next generation multimediainformation of real-time and nonreal-time traffic and various multisourcemultitraffic communications environments. We have envisioned that CDMA is akey technology to satisfy the mundane usage of information transmission, and weare devoted to refining the definitions of capacity of the CDMA systems as theproper analytic measure to optimize the resources. At first, we need to observe thebehavior of the voice and multimedia traffic to relate the simple measure of capacityand the characterizing parameters of traffic, where we specifically concentrated onthe traffic activity and activity factor of the traffic. Also, sensitivity, a key issue insystem engineering, is reinterpreted for the system capacity of the CDMA system tounderstand the nonideal parametric environment of system design. Once the capacityrepresents the objective for the system resource, while activity is the key parameterto represent traffic, the well-known capacity formula of an IS-95-type voice-onlyCDMA system can be revisited by our language. Naturally, we can extend theknown 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 andresource management, which is further analytically investigated for practicalapplications into traffic engineering, along with emerging environments. Weconsider that a service may be provided efficiently under hybrid frequency divisionmultiple access (FDMA)/CDMA systems and the overlaying multiaccess systems,respectively.