1摘 要人们口头常说的移动通讯在一定程度上可以归结为固定点到移动用户间或者双向移动用户所进行的一系列通讯形式。在此过程当中主要凭借卫星通讯、蜂窝、团队无线电以及集体等层面的系统形式,在相对较为复杂甚至存在扰动的外部环境当中实现的信息传播、通信。CDMA 技术又称码分多址技术,该技术已成为全球无线接入技术之一,是当前无线通信,特别是移动通信的主要技术,它不仅具备相对较高的高频利用率,在抵抗扰动方面也呈现出相对较强的态势。所谓的技术可有效凭借扩频技术进行一系列带宽信息的传输工作,相应的带宽在一定程2度上要比所谓的信息带所需宽高出多个数量级,正因如此,可以通过其伪随机码完成相应的调制,紧接着再依据载波调制完成相关信息发送。在接收端必须保持所用的伪随机码相对一致,才能对相应接收的带宽信号完成切实有效的处理,这也就是所谓的解扩,从而得以实现通讯。基于对完成虚拟通讯仿真工作,在此过程中可以得到相应的基带信号源以及完成调制后的相关频谱图。根据相应的仿真结果可以得知,即使存在相对较大的噪音干扰,相应的输入信号也能彻底在接收端完成全面再现。本文研究了 CDMA 系统的主要原理部分,包括系统理论模型,并仿真了一些计算模型。关键词:码分多址技术,直接序列扩频,m 序列伪随机码3ABSTRACTThe mobile communication that people often say verbally can be attributed to a certain degree of communication form from fixed point to mobile user or two-way mobile user. In this process, information dissemination and communication are realized in a relatively complex and even disturbed external environment mainly by means of system forms such as satellite communication, cellular, team radio, and collective.CDMA technology, also known as code division multiple access technology, has become one of the global wireless access technologies, and is the main technology of current wireless communication, especially mobile communication. It not only has relatively high frequency utilization, but also resists disturbance. The aspect also shows a relatively strong situation. 4The so-called technology can effecti...