WCDMA前向功率控制的研究及移动台发射的硬件实现

【作者】 蒋大勃；

【导师】 赵春明；

【作者基本信息】 东南大学 ， 通信与信息系统， 2004， 硕士

【摘要】 WCDMA是第三代移动通信系统中最具竞争力的标准之一。在移动台低速运动的信道环境中,信道长时间处于深衰落。同时在CDMA系统中由于所有的用户均使用相同的频带,用户之间彼此干扰。除此以外,路径损耗等因素都导致了系统容量的下降,解决这些问题的最有效的方法就是采用功率控制技术。在本文的第一部分中,我们对功率控制作了一个全面的介绍,讲述了功率控制中的一些基本概念,特别分析了闭环功率控制的稳定性问题。在第二部分,首先给出了WCDMA前向闭环功率控制的仿真模型,其次讨论了影响闭环功控的因素,最后给出了功率控制下计算机仿真结果和实现时的注意点。在第三部分中,我们给出了外环功率控制的仿真性能,讨论了宏分集下调整环的作用。论文的最后一部分介绍了WCDMA上行链路物理层协议,复用流程及上行发射的硬件实现,给出了资源占用情况和测试结果。更多还原

【Abstract】 WCDMA is one of the most competitive CDMA systems in the Third Generation Mobile Communication System. When a mobile is in low speed, it will be in deep fading for a long time. At the same time, in CDMA system all users share the same bandwidth, so they will interfere with each other. They, including path losses etc, result in low system capacity. Power control is an effective way to solve this problem.In the first part of this thesis, we provide a full view of power control and give some basic principles. We especially analyze the stability of closed loop power control. In the second part, the simulation model of closed -loop power control in WCDMA downlink is introduced. Then, we discuss the factors pertinent to power control. Finally, simulation results are given. We also take the implementation into account. In the third part, we provide simulation results of outer loop power control and the adjustment loop in outer loop power control is under consideration. In the last part of the thesis, the physical layers of WCDMA uplink and the process of multiplexing are introduced .We successfully implemented WCDMA UE transmission module in FPGA platform.更多还原