多速率分层结构CDMA系统联合控制算法

本文对多速率分层结构CDMA系统的联合控制算法进行了研究,提出了一种新的功率、速率和接入联合控制算法。在此基础上,考虑到基站发射功率资源受限以及信道的路径损耗、多径衰落和阴影衰落的影响,得到了系统容量与系统各业务负载的数量以及速率间的关系。另外,该联合控制算法使系统能够自适应地调节VBR业务的速率以及获得最大总有效数据速率;同时通过预测新用户接入系统所需的功率资源,来判断系统是否接受接入请求。最后,利用MonteCarlo方法对该系统算法进行了仿真,给出了相应的仿真结果和分析。

A joint control algorithm of multirate hierarchical CDMA systems

Joint control algorithms of multirate hierarchical CDMA systems are studied. We propose a new algorithm of power, rate and admission joint control. From the power limit of a base station, we get the relationship among of the system capacity, system load and service rate, taking account of path loss and shadow shading. The VBR rate can be adaptively adjusted by the system under the control of the joint control algorithm, then the system can get the maximum total effective data rate. By predicting the required power of a new call, we make a decision about the admission of this new call. Finally using the Monte Carlo method, we simulate the joint algorithm of the multirate hierarchical CDMA system, and give the results of the simulation.