【作者】 杨会玉；

【导师】 李雅梅；

【作者基本信息】 辽宁工程技术大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 在以宽带码分多址技术为基础的第三代移动通信系统中,功率控制技术是其关键技术之一,是推进码分多址系统发展的核心技术。功率控制技术可以减小干扰对码分多址系统的影响,克服“远近效应”和“角效应”,在保证通信质量的前提下,提高通信系统容量。本文主要研究第三代移动通信系统中的功率控制算法。论文首先介绍了第三代移动通信系统的发展状况和关键技术,探讨了功率控制技术的目的、意义,控制准则,功率控制技术分类和影响功率控制的因素等。论文中讨论了功率控制算法的重要性,将不同类型的算法进行了比较和研究,分析不同算法的特点,并介绍了一些典型的功率控制算法及改进的功率控制算法。论文最后提出了一种上行链路自适应变步长功率控制算法,该算法是在传统定步长功率控制算法的基础上改进产生的,算法考虑了多个控制命令的变化,根据不同情况改变控制步长,因而该算法与固定步长算法相比能更好的补偿无线信道的衰减,可以提高系统性能。仿真结果表明,本文提出的自适应变步长功率控制算法与固定步长功率控制算法相比,无论从信干比的收敛性能,还是从误比特率的性能上都有一定的改善。而且本算法又有占用带宽窄,控制方法简单等优点,故有很大的优越性。更多还原

【Abstract】 In a wideband CDMA technology-based third generation mobile communication system, power control technology is one of the key technology,the core to promote the development of CDMA system. Power control technology can reduce the impact of interference on the CDMA system, overcome the "distance effect" and the "corner effect" in the premise of ensuring the quality of communication and improve communication system capacity.This thesis focus on power control algorithm of the third generation mobile communication system. Firstly,introduces the third generation mobile communication system development condition and key technologies,discusses the purpose, meaning and control guidelines of power control technology, along with power control technology classification and the factors affecting power control. Secondly, the paper presents the importance of power control algorithms, describes some typical and improved power control algorithms by comparing and analyzing on their characteristics. In the end, based on traditional fixed step power control algorithms, the paper proposes a novel variable step adaptive uplink power control algorithm, which taking a number of changes in control commands into account, can adjust the control step size depending on different circumstances. Thus the developed algorithm is better in compensating the attenuation of wireless channel than that with fixed step size, and can highly improve system performances. Simulation results show that the proposed adaptive variable step power control algorithm have improved a lot in both convergence performance of signal to interference ratio and bit error rate performance. Further more, the algorithm needs narrow bandwidth and simple to control and therefore has strong advantages.更多还原