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文中研究了软件无线电中数字混频的设计方法,分析了采用传统的数字混频结构实现的缺点,并提出了两种改进办法:传统方法基础上加全微分补偿的改进实现方法与基于CORDIC算法的数字混频方法,用FPGA分别对其进行了硬件实现,并比较了这两种实现方法的特点。本文分析的这两种实现方法,能够在硬件资源消耗很小的情况下,用FPGA实现高速数据混频,因而非常适合在软件无线电系统中使用。
In this paper, the design method of digital mixing in software radio is studied, and the disadvantages of using traditional digital mixing structure are analyzed. Two improved methods are proposed: the improved method based on traditional method with full differential compensation and the method based on CORDIC Digital mixing method, respectively, with its hardware were implemented FPGA, and compared the characteristics of the two methods. The two methods we analyzed in this paper can use FPGA to achieve high-speed data mixing with little hardware resource consumption, and thus are very suitable for use in software radio systems.