【作者】 李娜；

【导师】 马洪；

【作者基本信息】 华中科技大学 ， 电磁场与微波技术， 2005， 硕士

【摘要】 随着城市里移动通信用户的急剧增多以及各种建筑及地下设施的建设,人们对移动通信网络的覆盖能力要求也在不断上升。对于建筑物内部及地下等电波盲区,虽然有多种可行的室内覆盖技术方案(如微蜂窝技术等),但在不需要增加容量的情况下,架设小功率直放站是最经济、简单地延伸通信网络覆盖能力的方法。本文在简单综述CDMA 直放站研制意义的基础上,详细描述了应用于CDMA 移动通信网络室内覆盖场合的CDMA 无线宽带小功率直放站的研制过程,并对其线性性能进行了分析仿真。本论文首先介绍了CDMA无线宽带小功率直放站基本结构及其技术指标要求。在此基础上,以直放站主机部分下行链路为例,详细描述了各部分电路的硬件电路设计、链路预算、器件选取及优化仿真,列举了调试工作中遇到的问题和解决方法,并给出了整机测试结果。为了衡量非恒定包络CDMA 信号激励下的直放站输出信号非线性失真特性,本文在综合利用复包络方法、时域/频域分析技术及MATLAB 仿真技术的基础上,对描述CDMA 信号激励下的直放站非线性失真特性的各种参量进行了定义、计算及分析比较,其中邻信道杂散发射及双频互调衰减指标对直放站的线性性能要求尤为严格。最后,本文进行了CDMA 直放站工程应用相关问题的研究。在上、下行链路平衡原理的基础上进行了CDMA直放站主要工作参数的分析和计算,讨论了CDMA直放站架设对900MHz GSM 系统及CDMA 系统的影响以及天线使用安装原则等。更多还原

【Abstract】 With rapid inceasing of the mobile phone users and the construction of the various building and underground facilities, subscribers have an increasing demand for the communication coverage ability. Although there are more feasible solutions for the indoor coverage (such as microcell technique), but for applications requiring no further capacity, a small-power repeater is the cheapest and simplest solution for communication coverage extending. Firstly, the significance of the CDMA repeater development is summarized in this paper, and then the development and performance analysis process of the CDMA wireless wideband small-power repeater which is applied to indoor coverage of CDMA mobile communication network is described in detail. This paper first illuminates the structure of the CDMA wireless wideband small-power repeater and its technical requirements. Give the repeater’s downlink for an example, its hardware design, chain circuit budget, elements choosing and optimization simulation are described. The problems encountered in circuit troubleshooting and the solutions are enumerated here and the test result of the whole repeater is also presented. In order to scale the distortion characteristic of the signal outputed by the repeater excited by CDMA signal with nonconstant envelop, the parameters used to describe the nonlinear characteristic of the repeater are defined, calculated and analyzed by utilizing the complex envelop, time/frequency domain analysis and MATLAB simulation techniques synthetically. By comparison, the index of spurious emission in adjacent channel and dual-tone intermodulation attenuation are more rigorous for the requirement of the repeater’s linear performance. Finally, the engineering application problem of the CDMA repeater is studied. The work parameters of repeater are analyzed and calculated on the basis of link balance principle. The influences between the repeater and the 900MHz GSM and CDMA system are discussed. And the problem of antenna’s usage is presented at the end of the paper.更多还原