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摘要 TD-SCDMA 系统是我国自主研制的第三代移动通信系统，同时它也是国际上四大标准之一。TD-SCDMA 系统即时分同步码分多址系统，最终是要根据扩频码和扰码产生的复合码来识别用户和小区的。TD-SCDMA 系统研究时间相对于WCDMA系统要晚，在网络规划等技术方面还不够成熟。并且 TD-SCDMA系统的码资源要比 WCDMA 系统中的码资源少，所以对码字优化的要求要比WCDMA系统高。在码字优化方面，对 TD-SCDMA系统的码字优化的研究进行的比较少，且TD-SCDMA 系统的扩频码和扰码均为短码，就更加需要进行码字优化的设计和研究。 本文首先简单介绍了移动通信的概念及特点，同时简述了TD-SCDMA 系统码字优化研究的意义。接着是对 TD-SCDMA 的简介，包括 TD-SCDMA 系统导频码、扩频码、midamble 码、扰码以及由扩频码和扰码生成的复合码的产生过程。然后分析了TD-SCDMA系统中码字的不同的相关性，并且简述了扰码规划的各种常用方法，重点分析了一种常规扰码规划算法——扰码优化组合算法，应先确保选出的下行导频码在相邻小区内未被分配过， 接着再尽可能地确保选出的扰码和相邻小区的扰码相关性最好。最后在 MATLAB 软件中进行了扰码仿真，重点仿真了M 序列和 Gold序列。 37435
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毕业论文关键词：TD-SCDMA 扰码 复合码 相关性
Abstract TD-SCDMA system is the third generation mobile communication system which is independently developed in our country, and it is also one of the four international standards. TD-SCDMA system, is ultimately generated based on the spread spectrum code and scrambling code to identify the user and the community. The research time of TD-SCDMA system is later than the WCDMA system, and the technology of network planning is not mature enough. And the code resource of TD-SCDMA system is less than the code resource of WCDMA system, so the optimized code word optimization is higher than WCDMA system. In the code optimization, of the TD-SCDMA system and code optimization research is relatively small and TD-SCDMA system of spread spectrum codes and scrambling codes are short code, has increased the need for code optimization design and research. In this paper, the concept and characteristics of mobile communication are simply introduced, and the significance of the optimization of TD-SCDMA system code is briefly introduced.. Then the introduction of TD-SCDMA, including TD-SCDMA system pilot code, spread spectrum code, midamble code, scrambling code and the spread spectrum code and scrambling code generation of the code generation process. And then analyzes the different correlation of code words in TD-SCDMA system, and describes the scrambling code planning a variety of commonly used methods, focusing on analysis of the a conventional scrambling code planning algorithm, scrambling code optimization combination algorithm, to ensure that the selected downlink pilot frequency code in the adjacent cells is not pided with, then as far as possible to ensure the selected scrambling code and adjacent cell scrambling the best correlation. Finally, use MATLAB software to simulate the scramble code, especially M sequence and GOLD sequence.
Keywords: TD-SCDMA Composite Scrambling code Correlation
目录
摘要.I
AbstractII
1.绪论.1
1.1无线移动通信的介绍.1
1.1.1移动通信概念1
1.1.2TD-SCDMA系统的发展史.1
1.2TD-SCDMA码字优化的研究意义3
1.3本文主要内容和章节安排.5
1.3.1主要研究内容5
1.3.2章节安排5
2.TD-SCDMA系统的码字优化理论6
2.1TD-SCDMA简介6
2.2TD-SCDMA系统的码资源9
2.2.1上/下行同步码9