Based on software radio technology practical spread spectrum communication construction of system and principle analysis 基于软件无线电技术的实用扩频系统结构及原理分析
However , key issues of the 2d - ss system are not studied widely at present . further research work should be done in this area 目前对二维扩频系统的研究尚浅,对其关键技术还需进一步的理论分析。
It contains the despread spectrum , baseband demodulation , synchronization and the technology of modulate and demodulate in the ss system 主要是扩频系统的相关解扩、基带解调、同步以及扩频系统中的调制与解调技术。
The synchronization is the key technology which affect the performance of the receiver heavily in the ds - ss ( direct - sequence spread - spectrum ) system 同步技术是直接序列扩频系统的关键技术,同步性能的好坏直接关系到系统性能的优劣。
Consequently pn synchronization is the key technique in spread spectrum system , and is an important element to influence the performance of the whole system 因此，扩频序列的同步是扩频系统中的关键技术，也是影响整个扩频系统性能的重要因素。
Chapter 3 discuss the modem technology and synchronization of direct sequence spread spectrum system ( the design in this paper also use this system ) 第三章对常用的直接序列扩频系统(本设计也正是使用这种系统)的调制解调以及同步技术进行了讨论。
Comparing with the traditional dsss systems , the length of c / a code in beidou project is longer than that of them , which brings us some advantages 相对于其他通信系统,卫星导航定位系统所采用的粗捕获扩频码( c / a码)相对于传统扩频系统的扩频码的周期较长。
Secondly , based on the methods of fast acquisition for code , a new algorithm with two - dimensional fft in order to increase the speed of signal processing is proposed 然后受扩频系统中码捕获原理的启发,本文提出利用二维傅立叶变换的方法进一步提高信号处理的速度。
During the design of the system , a special aim is how to reduce the scale and raise the speed of the system because the scale of ( 1024 , 10 ) is very large 在系统的设计过程中，针对高多进制扩频系统的规模大的特点，就如何降低系统规模和提高系统的工作速度进行了研究。
Synchronization technique of spread spectrum code is utilized in two stages . multipath searcher coarsely estimates the pn code phase and code tracking confirm the pn code phase precisely 这需要采用扩频系统中扩频码同步技术,即:多径搜索粗略地估计pn码相位,同步跟踪精确确定pn码相位。
