基于TDMA的时隙慢跳频图案的研究-信息与通信工程专业论文.docxVIP

Classified Index: TN914.41 U.D.C: 621.3 Dissertation for the Master’s Degree in Engineering STUDY ON THE PATTERN OF SLOW FREQUENCY HOPPING BASED ON TDMA TIME SLOT Candidate： Zhang Wei Supervisor： Prof. Sun Pengfei Academic Degree Applied for： Master of Engineering Specialty： Information and Communication Engineering Affiliation: School of Electronics and Information Technology Date of Defence: June, 2009 Degree-Conferring-Institution: Harbin Institute of Technology 摘 要 近年来，我国专业网络发展迅速， iDEN（ Integrated Digital Enhanced Network）系统，TETRA（Terrestrial Trunked Radio）系统相继在各个城市亮 相，但是这些现有系统依然存在成本较高，频谱资源利用率不高的问题，使得 这些网络基本只在繁华地区布网使用。为了实现大规模的布网，就需要针对国 情设计成本更低，频谱利用率更高的 集群系统。因此，本文在集群 DMR （Digital Mobil Radio）协议的基础上提出了时隙慢跳频的信道使用方法，兼 顾了低成本和高频谱利用率。 本文首先介绍了传统跳频序列的设计方法。对序列的衡量标准和理论极限 进行探讨，并对研究较多的 m 序列和 RS 序列进行仿真和性能分析。上述两者 序列均具有良好的频率均匀性，较大的跳频间隔和优秀的汉明相关性能。 其次，对基于计数式跳频序列设计的方法及特性进行研究。分析了蓝牙序 列的构成方法，并借鉴其中计数的想法构建了一个新的跳频序列。序列的设计 采用了加法、异或、查表等便于硬件实现的方式。根据对序列的仿真，验证了 新序列符合频率的均匀性，较大的跳频间隔和较好的汉明相关性，完全满足设 计要求。 最后，本文探讨了跳频对系统容量的贡献。探讨跳频系统容量的计算方 法，并定量分析研究了采用时隙慢跳频信道使用方法后容量的提升。认为时隙 慢跳频的信道使用方法是可以实现的，并存在实际意义的，跳频技术的引入可 以获得更好的抗干扰性能，而且可以达到非常可观的容量提升。 关键词：时隙慢跳频；序列；容量；集群；时分多址 Abstract Trunking system is developing rapidly in China recent years. iDEN system, TETRA system have been built in some cities, but high cost and low utilization ratio of frequency spectrum cause these system can only be used in few developed cities. In order to cover the extensive under developed area, it is necessary to design a trunking system which has the characteristic of lower cost and higher spectrum efficiency. According to the DMR standard we propose a new method to use slow frequency hopping channel based on TDMA time slot. Firstly, the article introduces the traditional design methods of frequency hopping sequences, and discusses the measurement and theoretical limits. According to the simulation of the m sequences and RS code sequences, it shows that the two sequences have excellent uniformity in frequency domain, greater