Although the construction methods of duality sequence have their excellences , they have limit . for example , there are few number of address code , and the improved degree of correlation is near to zero . therefore , the duality sequence can not satisfy the demand of users and adapt the increase of user 虽然二元序列的各种构造方法有其各自的优点，但却共同存在着许多限制，如地址码数量过少，相关性能改善程度已趋近于零等，从而无法适应移动用户数量的不断增加且无法满足用户对通信质量不断提高的要求。
Having high quality in high - capacity , anti - jamming , privacy etc , inter - satellite optical cdma communication technology is promising . as the address code , code or encode multi - user detecting etc developing , it ’ s impossible to use optical cdma technology into satellite communication . this dissertation does research on the problem 为此,本文对以下内容展开深入的研究: 1 )分析研究了卫星光cdma通信系统的基本原理和关键技术,如调制解调技术、地址码的构造技术、光cdma编解码技术、探测技术、无线光-光纤耦合技术及atp技术。
On the base of researching the theory of the scheme and analyzing the signal feature , it is obtained that the existence manners and character of distance information in the differential frequency signal . at the same time , a new conclusion is gained that the technology of frequency agility can decrease the constant error of system . it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze . according to the theory of address coding in the hopping - frequency communication , the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes 在深入研究方案原理和分析信号特征的基础上，获得了该体制引信差频信号中，距离信息的存在形式和特点，得出了频率捷变技术的引入降低了系统定距固定误差这一新的结论，即频率捷变调频定距引信在定距性能上具有类似随机周期调频定距的特征。本文引入跳频通信地址编码理论，结合无线电引信的具体特征，提出了适用于无线电引信的频率捷变序列的选择原则，并构造了基于rs码的宽间隔频率捷变序列族。
The key is that the head - end emits the guide m sequence , which is non - correlative with any users " address code . the phase of all users address code and the head - end address code are combined with the guide m sequence . every user address code phase can attain after the guide m sequence phase is searched and tracked 论文所提出的方案是通过前端发射固定的导频信号，并且在前端和用户端都把用户地址码相位捆绑在导频相位上，使得用户在同步捕获和跟踪导频相位后，间接得到用户的地址码相位。
So the chaotic sequence can indeed serve as spreading address code in spreading communication . after discussing the communication theory of cdma , we propose the model of the ( cd ) 2ma communication system and utilize the simulation tools of matlab simulink to propose the ( cd ) 2ma simulation system according to this model 在论述了码分多址通信原理的基础上，给出了混沌数字码分多址( ( cd ) ~ 2ma )通信系统的模型，并依据此模型使用matlabsimulink仿真工具给出了混沌数字码分多址通信系统的可视化仿真系统。
In this dissertation , the researches on the application of cdma in fiber - optic communication systems have been reviewed , and several key techniques in the application are proposed with theoretical analysis . in traditional researches and applications of the hfc cdma communication system , the gold sequence was used as the users " address code . in this paper , we analyze the characteristics of the m sequence in detail 本文突破了以往在hfc系统中使用cdma扩频技术通信时，通常都采用gold序列来作为地址码的惯例，分析和提出了在hfc的特定环境中，使用同一m序列在某时刻具有的不同相移序列，来构成一个小区的地址编码，能够达到多用户通信时比使用gold序列进行通信具有更好的相关特性。
