基于相位旋转法的NCO设计与实现

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。

Design and implementation of NCO based on phase rotation

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 ...