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直接数字频率合成(DDS)是一种新型的频率合成技术。介绍了如何利用DDS技术来产生调频波形及其他的数字调制波形;阐述了一种新的适合于软件无线电实现的算法,即采用预先计算后存贮在存贮器中的波形来代替实时运算,直接合成数字调制波形(DWS);研究了一种压缩查找表的方法。此外,还对此算法在实现过程中遇到的截断误差、运算量和存贮量的问题进行了探讨。对于所提及的算法,给出了仿真结果。
Direct digital frequency synthesis (DDS) is a new type of frequency synthesis technique. This paper introduces how to use DDS technology to generate FM waveforms and other digital modulation waveforms. A new algorithm suitable for software radio implementation is described, which uses pre-calculated waveforms stored in memory instead of real- Direct synthesis of digital modulation waveform (DWS); study a compression lookup table method. In addition, the problems of truncation error, computation and storage encountered in the realization of this algorithm are also discussed. For the algorithm mentioned, the simulation results are given.