一种PEDS系统分集接收方法的研究及仿真验证

发布时间：2018-04-22 08:42

本文选题：PEDS + 分集接收　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：近年来,具有中国独立知识产权的中国警用数字集群(Police Digital Trunking)标准的研发工作已经圆满结束。PDT警用数字集群标准,是在我国公安主管单位带领下,由中国国内通信系统供应商一起研究制定的数字专业无线通信技术标准,它充分考虑了我国公安机关指挥调度的通信需求,同时还吸收了国际上比较成熟的标准协议的长处,因此将成为我国公安通信领域的数字集群通信系统标准的发展方向。但是,由于PDT采用的是窄带通信技术,除了语音通信外,无法实现包括图像在内的高速数据传输,因此国内现研究的PEDS(Police Enhanced Data Service)系统是用以由窄带集群系统向宽带集群系统的演进。本课题研究的是一种PEDS系统分集接收方法,并对分集接收算法进行仿真验证和外场工程测试。本文首先对PDT系统进行了简要的分析介绍,通过与现行的几种数字集群技术的对比,分析了PDT系统的优势和不足,论证了PEDS系统的研究必要性。其次深入研究了无线信道特性和分集合并技术的基本原理,并根据PEDS的实际要求,通过比较传统的分集合并方法,选择空间分集和最大比合并的方法作为PEDS的分集合并技术。之后重点对分集接收方法,进行了PEDS系统建模与仿真,并对多种分集合并方式、多种环境情况、多种信号类型的仿真结果进行了对比,确定了最佳的分集合并接收方案。然后,根据系统实际要求,针对同步方式,提出了具体的解决方法,并优化了匹配滤波同步的性能。最后,针对合并接收时相位调整的问题,根据锁相环原理,提出了一种相位对齐的优化方案,使得多个支路信号的合并效果得到提升。最后根据前面提出的分集接收算法和性能优化,对PEDS系统的分集接收过程进行了外场测试,同时将算法和优化方案进行了工程实践,并从实践中发现问题,解决问题。并根据其理论性能和实测结果的分析,可确定算法实现过程中的不足,并最终进行了最优化处理,达到了工程项目的应用要求。
[Abstract]:In recent years, the research and development of the police digital trunking (Digital) standard, which has independent intellectual property rights in China, has been successfully completed. The digital professional wireless communication technology standard, which has been studied and formulated by domestic communication system suppliers in China, fully takes into account the communication needs of the command and dispatch of public security organs in China, and at the same time absorbs the advantages of more mature international standard protocols. Therefore, it will become the development direction of the digital trunking communication system standard in the field of public security communication. However, because PDT uses narrowband communication technology, it is impossible to realize high-speed data transmission, including images, except for voice communication. Therefore, the PEDS(Police Enhanced Data Service (PEDS(Police Enhanced Data Service) system is used to evolve from narrowband trunking system to broadband trunking system. In this paper, a diversity receiving method in PEDS system is studied, and the diversity receiving algorithm is verified by simulation and field engineering test. In this paper, firstly, the PDT system is briefly analyzed and introduced, and the advantages and disadvantages of PDT system are analyzed by comparing with several current digital trunking technologies, and the necessity of research on PEDS system is demonstrated. Secondly, the characteristics of wireless channel and the basic principle of diversity combination are deeply studied. According to the actual requirements of PEDS, the spatial diversity and maximum ratio combination are selected as the diversity merging techniques of PEDS by comparing the traditional diversity merging methods. After that, the PEDS system modeling and simulation are focused on, and the simulation results of multiple diversity merging methods, environment and signal types are compared, and the optimal diversity merge reception scheme is determined. Then, according to the actual requirements of the system, a specific solution is proposed for the synchronization mode, and the performance of matched filtering synchronization is optimized. Finally, according to the principle of phase-locked loop, a phase alignment optimization scheme is proposed to improve the combination effect of multiple branch signals. Finally, according to the diversity receiving algorithm and performance optimization proposed above, the field test of diversity receiving process in PEDS system is carried out. At the same time, the algorithm and optimization scheme are carried out in engineering practice, and the problems are found and solved from the practice. Based on the analysis of the theoretical performance and the measured results, the shortcomings of the algorithm can be determined, and the optimization treatment is finally carried out, which meets the requirements of the engineering project.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.52

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