VHDL扩频通信系统.doc

摘
要

随着社会信息化程度的加强,人们对通信质量要求越来越高。扩频通信技术具备了现代通信系统的诸多优点的,如容量足够大、传输距离足够远、保密性能好,而且还有提高频谱利用率、选择性寻址能力强、截获概率低、抗多径干扰、易于组网等优点。扩频通信技术广泛应用于众多领域,包括现代军事通信、移动通信、卫星通信、军事战术及指挥控制通信。扩频通信按工作方式分类可分为直接序列扩频、跳变频率扩频、跳变时间扩频和混合扩频四种。跳频—直接序列混合扩频适应于多址通信或离散寻址和多路复用等。
扩频通信系统完成的信号处理变得越来越复杂,电路的处理速度也必须相应提高。早期的分立器件自身体积大、消耗功率高,模拟器件受环境影响较大,在设计中不易实现。把电路集成后也存在成本高、采购困难等弊端。近几年,EDA技术和微电子技术发展势头强劲,跳频通信的实现大多是利用EDA技术,因此其成为数字信号处理领域的新生力量。基于上述现状,本次设计是用VHDL语言对直接序列跳频系统进行编程实现,在QuartusII软件环境下进行仿真,结果验证了设计的正确性。
关键词:VHDL;直接序列扩频;跳变频率扩频;Quartus II
ABSTRACT
With the strengthening of social information degree, people demand more and more high quality munication technology has many advantages of munication system, such as transmission distance far enough capacity is large enough Security performance is good, but also improve the utilization rate of spectrum selective addressing capability Low probability of intercept Resistance to multipath interference The advantages of easy munication technology is widely applied in many fields, including modern munication mobile munications military tactics mand and munication according to the classification of works can be divided into direct sequence spread spectrum frequency hopping spread spectrum jump time four frequency hopping spread spectrum and hybrid spread spectrum mixed direct sequence spread spectrum adaptation on multiple munication or discrete addressing and multiplexing, etc.
Spread munication system to plish the signal processing is ing more and plex, processing speed of the circuit must also improve the early discrete device corresponding high volume consumed power, analog devices are greatly influenced by the environment, in the design is not easy to achieve the goal of integrated circuit after have drawbacks such as the high cost of purchasing difficulty Development momentum in recent years, the EDA technology and microelectronic technology, the realization of frequency munication is mostly using EDA technolo