【作者】 刘晓峰；

【导师】 袁东风； 郝军；

【作者基本信息】 山东大学 ， 电子与通信工程， 2008， 硕士

【摘要】 专业移动通信是移动通信的重要组成部分,市场十分广阔。集群移动通信系统是专业移动通信系统发展的高级阶段。数字化对集群系统带来的好处正如蜂窝系统数字化一样。目前应用广泛的数字集群系统有iDEN系统、TETRA系统、GT800系统和GoTa系统。数字集群通信系统与模拟集群通信系统相比,可望得到更丰富的业务种类、更强的抗干扰能力、更好的保密性、更高的频谱利用率等。本文介绍了基于GoTa的数字集群通信系统的基本工作原理及话务模型,GoTa系统是一种基于CDMA的数字集群通信系统,本课题就是在实际工作中,通过细致的需求分析、现场勘察、规划情况交流,为了提升网络质量而展开的。目的是通过不断学习,以提高网络通话质量为契机,通过对各种统计数据和全面的测试数据进行分析找出影响功能质量的结症所在,进行全网的系统性调整,从整体上使基于EDMA的数字集群网络质量达到一个新的水平。从而实现优化目标,使网络达到目前规模下最优的性能和质量。由于我国数字集群移动通信系统的研究和开发工作,尚处在学习和跟踪国外技术的阶段,技术力量不足,试验系统正在运行或拟建中,许多关键技术仍处在研究过程中,大型商用系统的规划、建设、运营可借鉴的经验很少。本文共分为五章:第一章绪论简要介绍数字集群系统的特点、发展,并对典型的数字集群通信体制进行了比较和分析;第二章首先详细介绍GoTa集群系统的网络结构、组网方式,并对其接口协议进行了具体分析;第三章主要介绍了基于GoTa系统的话务模型及分析;第四章在前一部分的基础上,对优化改进和提高进行具体描述,并通过测试和结果分析说明了该改进规划方案的可行性。更多还原

【Abstract】 Professional Mobile Radio(PMR) is an important part of mobile communication system and has a vast market desire. Trunked radio system is a high level development stage for the PMR system. Digitization of the tunked radio system brings many advantages just as the digitization of cellular system. Currently, there are several typical trunked radio system, such as iDEN, TETRA, GT800 and GoTa. Compared digital trunked system with current analog private mobile system, the digital trunked system has the advantage of abundant business kinds, preferable secrecy, excellent anti-interference and efficient spectral.Consequently, the thesis compares and contrasts the present digital trunking standards and types upon the summary of digital trunked systems at home and abroad. In course of our study, we focus on the GoTa technological criteria, which based on CDMA.At first the general flow of CDMA radio network design is given. Based on the theoretical analysis and of the building experience, a better GoTa Trunked radio network building sheme of Jina City used in urban districts is given. The scheme is wholly simulated by using soft and hard methods. The simulation results are shown and analyzed. It shows that the scheme has the characteristics of easy realization and excellent performance.However, we have lagged behind the foreign countries in researches and development of the digital mobile communication system. At present, some experimental systems are being used or to be set up. Many key techniques are still in the preliminary stage. No experiences can be borrowed for regulating, building and operating the large sized commercial systems. Because of poor technology, we still have to leran and follow foreign industries.更多还原