We build the baseband model of the ar self - encoded spread spectrum system both for a user and multi - user , and do a lot of simulation for the system . in addition , we discuss the performance deeply based on the simulation 本文建立了单用户及多用户的ar自编码扩频系统的基带模型,并在仿真结果的基础上,对该系统的性能进行了更深入的讨论。
The design of pn code synchronization should find a trade - off between the performance and the complexity of the reciever . in this paper , the pn code synchronization technique in spread spectrum communication is introduced 本论文首先介绍扩频系统中采用的pn码同步技术,然后结合wcdma上行链路的特点,提出适合wcdma上行链路的扩频码同步方案。
The data recovery at the receiver requires the spreading codes . in sess system , the receiver doesn ’ t know which spreading code will be used , so first it must de - spread the received signal correctly to regenerate the spreading code 自编码扩频系统的扩频序列是接收端事先未知的,不能用事先设计的本地扩频序列产生器产生,需要由恢复的数据获得。
After achieving the synchronization of the pn code and carrier , despreading and demodulating the received dsss signal can be executed with the local synchronized code and carrier . so , lots of energy and fund has been expended on it 直接序列扩频系统只有在完成了伪码同步和载波同步之后,才可能用同步的本地伪码和本地载波对接收的扩频信号进行解扩、解调。
Simulink and analysis about balanced gold code from correlation and power spectrum density curve are processed . at the same time , simulink experiment of ber performance on the base of theory analysis using designed spread spectrum system model 在码序列的互相关性和功率谱密度分布上对平衡gold码进行了仿真和分析，同时在构建的扩频系统上对理论分析进行了误码性能的仿真。
To combine theoretical and simulating productions with the practical application , we use cpld chip to realize the hardware flat of hybrid ds - fh spread spectrum communication system , which provides the basic of the further practicability 为将理论及仿真成果与实际应用相结合，本文应用cpld器件芯片实现了ds - fh混合扩频系统发射部分的硬件平台，为它的进一步实用化奠定了基础。
The gaussian approximation method used in single traffic cdma system is introduced , at the same time the improved gaussian method also discussed for greater accuracy , when the active user load is small . however , the improved gaussian method needs more complicated calculations 研究gsc的结构以及其输入端信号的统计分布，为我们后面研究多速率扩频系统分集合并的gsc接收机作一些必要的数学准备。
In this article , we introduce the basic principle of the self - encoded direct spread ( seds ) system , construct the model of the system , and analyze the main performances of the system , such as ber performance , self - interference , mai performance and so on 本文介绍了自编码扩频系统的基本原理,构建了系统模型,并对其主要性能,如误码率性能、自干扰特性、多址能力和抗多径干扰能力等作了分析。
This paper deals with some key techniques of m - ary spread spectrum systems . a design scheme for m - ary spread spectrum system ( 1024 , 10 ) is proposed , including coding scheme , spread spectrum scheme , synchronizing scheme and despreading scheme 本文就多进制扩频系统的一些关键技术进行了研究，提出了高多进制扩频系统（ 1024 ， 10 ）的系统设计方案，包括编码方案、扩频方案、同步方案和解扩方案等。
This thesis researched the time synchronization method for 2d - ss system , and deeply discussed the bit error rate ( ber ) performance of multicarrier domain spread spectrum chip - level differential detection ( mc - ss - cldd ) in the presence of multi - user interference 本论文从多载波扩频通信系统出发,提出了广义二维扩频系统的同步算法,并对多载波频域扩频码片级差分检测技术在多用户情况下的系统性能进行了深入的研究。
