Abstract:

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.