非理想功率控制下WCDMA系统中的业务速率与系统容量  

INFORMATION RATE AND SYSTEM CAPACITY OF WCDMA SYSTEMS UNDER NON-IDEAL POWER CONTROL

作　　者：张彦[1] 阎鸿森[1] 朱世华[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《电子与信息学报》2003年第5期639-643,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60072040)

摘　　要：根据 WCDMA系统单小区功率分配算法有解的充要条件,通过将目标信干比抽象为对数正态随机变量的方法,该文得出了非理想功率控制条件下系统容量的定量关系式,为研究非理想功率控制下,VBR(Variable Bit Rate)业务的速率与 CBR(Constant Bit Rate)和 VBR业务的用户容量间的关系提供了一条有效的途径。分析和数值计算结果表明,非理想功率控制对系统性能有着显著的影响,业务速率和系统容量之间存在的互换关系。可以根据不同业务的性能要求,通过改变业务参数来提高系统的适应性,从而提高系统的资源利用率和服务质量。Starting from the sufficient and necessary condition of existence of solution for power assignment in a single cell WCDMA (Wideband Code Division Multiple Access) system, this paper obtains the system capacity under non-ideal power control through modeling the target SIR(Signal to Interference Ratio) with a log-normal random variable. This provides a criterion for determining the trade-off between the information rate of VBR(Variable Bit Rate) traffic and the capacities of CBR(Constant Bit Rate) and VBR traffics in mobile communications, Analysis and numerical results show that the system performance is notably declined by non-idea power control, and that the information rate and system capacity are exchangeable. As a result, the system can be adapted to diverse performance requirements for various services by varying the control parameters, then the resource utilization and quality of services of the system can be improved.

关 键 词：非理想功率控制 WCDMA系统 业务速率 系统容量 宽带码分多址 目标信干比 CBR业务 VBR业务 移动通信 接口标准 

分 类 号：TN929.533[电子电信—通信与信息系统]