基于相位旋转法的NCO设计与实现  

Design and implementation of NCO based on phase rotation

作　　者：张青林[1] 罗义军[1] 陈淑珍[1] 颜佳[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《系统工程与电子技术》2010年第5期908-911,共4页Systems Engineering and Electronics

摘　　要：针对信道化接收机的低通滤波器组结构中NCO消耗资源巨大的问题,提出了一种基于三角函数的相位旋转法。介绍了该算法的结构,然后在FPGA上实现了该方法。最后通过产生八路NCO所占用资源的对比,说明该方法与直接使用查表法或CORDIC算法相比最少能节省50%的逻辑单元和存储器单元。该方法可以很容易推广到频谱监测、多频移键控调制、跳频接收等应用中。To solve the problem that resource consumption of NCO is large in the low-pass filter bank of channelized receivers,a method of phase rotation based on trigonometric-function is proposed.Firstly the algorithm structure is introduced and implemented in FPGA.Then the logic elements and memory elements used in this method can save by at least 50% as compared with that of direct look-up table method or CORDIC algorithm according to the resources to be occupied by eight-channel NCO.And the method can be broadly applied in frequency spectrum monitor,multiple frequency-shift keying and frequency hopping receiver and so forth.

关 键 词：信道化接收机 低通滤波器组 数控振荡器 相位旋转 FPGA 

分 类 号：TN914.3[电子电信—通信与信息系统]