基于FPGA的QPSK的定点设计及仿真  

Fixed-Point Design and Simulation of QPSK Based on FPGA

作　　者：肖九思[1] 梁长松[1] 钱慧[1] 

机构地区：[1]福州大学物理与信息学院,福建福州350002

出　　处：《计算机仿真》2009年第5期154-157,共4页Computer Simulation

基　　金：福建省重大科技专项(2007HZ0003-1);福州市高新技术产业化贷款贴息项目(2007-D-006)

摘　　要：数字基带信号有时无法直接传输,需经过载波调制转换成适合的频带信号。而QPSK(Quaternary Phase Sh iftKeying)是一种线性窄带数字调制技术,被广泛应用于移动通信和卫星通信中,其突出特点是频带利用率高、频谱特性好、抗衰落性能强、可进行非相干解调。采用FPGA器件可以将原来的电路板级产品集成为芯片级产品,从而降低了功耗、提高了可靠性,同时还可以很方便地对设计进行在线修改。通过对QPSK的调制技术进行研究,利用自上而下的模块化设计方法把整个QPSK调制系统分解成串并转换、差分编码、译码、C IC滤波和正交载波调制5个小模块,并用Verilog硬件描述语言在FPGA上设计实现各个模块,实现了数字信号的传输,最后用testbench验证仿真结果。Digital baseband signal can not be transmitted directly in some situation, so it should be modulated by carrier into appropriate frequency band signal. QPSK（ Quaternary Phase Shift Keying） is one of the linear narrowband digital modulation technologies widely applied in mobile communication and satellite communication for its great performances such as high band utilization rate, good spectrum characteristic, effective anti - attenuation and available demodulation with noninterference. Using FPGA devices can integrate primary circuit board - level products into chip -level products, which can decrease power, improve reliability and edit the design online conveniently. In this paper, through studying the modulation technique of QPSK, top -down modularization design method, which partitions the entire QPSK modulation system into five small modules including series and conversion , difference encoding, decoding, CIC filter and orthogonal carrier modulation, is realized by Verilog hardware description language in FPGA modules. Digital signal transmission is implemented and finally the simulation result is verified by testbench.

关 键 词：定点 正交相移键控调制 数字调制 现场可编程门阵列 

分 类 号：TN[电子电信]