【摘要】 数字下变频技术是软件无线电的关键技术之一,其主要功能是把信号搬移到更低的频率上,将宽带高速数据流信号转变成窄带低速数据流信号,以便实时信号处理.研究了一种产生正弦和余弦而无需大量查询表的方法———CORD IC算法(坐标旋转数字计算).此算法的优点在于它不但替代了巨大的查询表,而且4个乘法器也不需要了,这是由于CORD IC算法可以用于实现复数的复相位旋转.这种方法能有效提高信号处理效率,减小硬件设计的代价,并通过仿真证明该方法的高效性.更多还原

【Abstract】 The basic function of digital down-conversion technology is to transfer wideband high speed data signals to narrowband low speed data signals,so that DSP can process them in real time.This paper studies the design of digital down converter based on coordinate rotation digital computer(CORDIC) algorithm,which can improve the efficiency of signal processing and reduce the cost of hardware design.The high efficiency is proved by the use of simulation.更多还原