基于FPGA的扩频发射系统的设计

Design of Spread Spectrum Lunch System Based on FPGA

针对一般无线通信系统抗干扰、抗噪声以及抗多径性能力差的缺点,提出了一种基于FPGA的直接序列扩频发射系统的设计;采用KASAMI码作为扩频调制的码序列,发射信息采用循环读ROM的方式,而后进行卷积编码,利用KASAMI码进行扩频,再进行极性变换,将扩频输出变为双极性码输出;在Altera公司的Quartus II软件中,使用硬件描述语言VHDL和原理图相结合的方法进行了电路的设计实现;最后通过Matlab进行描点画图,实验结果表明系统具有较好的扩频通信功能。

General wireless communication system has many has many shortcomings, for example the poor ability of anti--interference, anti--jamming and anti--multipath performance. This paper proposed the direct sequence spread spectrum Lunch System based on FPGA. This design uses KASAMI code series as spread spectrum modulation code sequences. The emission information produce by reading ROM , then eonvol the information and the information code is modulated by KASAMI code. In this paper , using both VHDL and principle diagram method design the circuit in the Altera company Quartus II software. Finally using Matlab draw some drawings to validate that The system has good spread spectrum communication function.