【作者】 乔春；

【导师】 王安义；

【作者基本信息】 西安科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 本文主要分析研究了TD-SCDMA系统中的关键技术:功率控制。码分多址CDMA系统是一个干扰受限系统,功率控制技术可以克服“远近”效应、“角”效应,减少一系列的干扰,使得系统既能维持高质量通信,又能增加系统的容量,功率控制技术被认为是所有关键技术的核心。本文首先介绍了第三代移动通信系统的发展和关键技术,对TD-SCDMA系统进行了简要的介绍。对第三代移动通信中的功率控制技术的准则、分类及各种方案进行了讨论分析。接着对TD-SCDMA系统中的功率控制技术进行了重点的研究分析,在原有算法的基础上提出了一种新的功率控制算法——自适应变步长算法。此算法是在传统的基于SIR的闭环功率控制的基础上加了一个自适应功率控制模块去实现的,该算法中移动台可以不依赖基站独自确定步长,因此该算法可以作为移动台一个附属功能而提高上行链路的TPC性能。然后详细的介绍了TD-SCDMA系统中自适应功率控制算法的仿真模型,最后对自适应功率控制算法的性能与原固定步长算法的性能进行了仿真比较分析,并且对无线信道和用户数对自适应功率控制算法的影响也做了研究。最后仿真结果表明自适应功率控制算法比固定步长算法性能更好,并且移动台干扰降低且快速收敛,具有较好的功率控制效果。更多还原

【Abstract】 Power control, as the key technologies of the TD-SCDMA system, is studied in this paper. CDMA Code Division Multiple Access system is an interference- limited system, and power control technology can overcome the“near-far”effect,“Angle”effect and reduce a series of interferences. It can allow the system maintain high-quality communication, and also increase the capacity of the system. So power control technology is the core of all key technologies.Firstly, this paper introduces the development and the key technologies of the third-generation mobile communication system and then brief introduce the TD-SCDMA system. Then it discusses and analyzes the power control guidelines、classification and various options of the third generation mobile communication technology. After that, mainly researches and analyzes the power control technology of the TD-SCDMA system and proposes a new power control algorithm—Adaptive Variable step algorithm on the basis of the original algorithm. The algorithm increases an Adaptive Power Control Module to achieve on the basis of the traditional SIR Closed-loop power control, and the algorithm can not rely on the mobile base station and alone determine the power control step. The algorithm can be used as a mobile subsidiary functions and improve uplink TPC performance. Afterward detailed introduce the simulation model of the TD-SCDMA system adaptive power control algorithm, and finally compare and analyze the simulation performance of the adaptive control algorithm with the fixed-step algorithm. Also the wireless channel and the number of users on the impact of power control algorithms have also done a study. In all, the simulation results show that the adaptive power control algorithm has a better performance than the fixed step algorithm, also can reduce interference、converge rapidly and has good power control.更多还原