基于软件无线电的QPSK调制的设计  

Design of QPSK Modulation Based on Software Radio

作　　者：刘秀兰[1] 王淑敏[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《计算机仿真》2008年第11期309-311,343,共4页Computer Simulation

摘　　要：在无线通信系统中,调制解调技术的好坏很大程度上决定了通信的质量,QPSK的调制技术在数字通信中占着非常重要的地位,这种调制方式具有优越的性能,在无线通信系统中被广泛应用。给出了QPSK的调制的整体结构以及串并转换电路的设计与VHDL语言的描述。对CORD IC算法的基本原理进行了研究,并提出了一种基于流水线CORD IC算法的数控振荡器(NCO)的设计方法,利用此算法代替传统的查表法(LUT),从而提高系统的运算速度和精度,也提高了系统资源的利用率。最后,在Quartusii环境下的对NCO进行了时序仿真并给出了仿真结果。In the system of wireless communication, modulation technology determines the quality of communication. QPSK plays an important role in digital communication system and this modulation has superior properties and is widely used in the field of wireless mobile communication. The architecture of QPSK modulation and series - parallel switch circuit and the part of VHDL are given. The principle of CORDIC algorithm is researched in the paper, then a NCO based on a pipelined architecture of CORDIC is designed, because CORDIC algorithm is substituted for lookup-table, the velocity and precision of system are improved and the utilization ratio of system is also raised. In the end, the paper gives the simulation result of NCO＇s scheduling in Quartusii.

关 键 词：坐标旋转数字计算算法 调制 四进制相移键控 数控振荡器 

分 类 号：TN929.5[电子电信—通信与信息系统]