滑动DFT在宽带数字接收机中的应用  

Application of Sliding DFT in Digital Wideband Receivers

作　　者：徐海源[1] 周一宇[1] 冯道旺[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《现代雷达》2007年第9期92-94,共3页Modern Radar

摘　　要：提出了一种基于滑动DFT的数字信道化接收机的结构设计。滑动DFT算法利用前一组DFT结果仅需少量运算即可得到新一组值,因此可以达到较高的运算速度,并节省运算单元,易于硬件实现。在DFT后增加了频域卷积,以减小频谱泄漏的影响。该接收机方案基于时频分析的思路,对各信道输出数据进行聚类处理,以实现对宽带信号的截获,仿真结果验证了该结构的有效性。A new architecture of digital channelized receiver based on sliding DFT is presented. The sliding DFT algorithm requires a constant number of operations to compute a successive DFT output. The algorithm can be easily implemented in hardware with high speed. The window function is used in frequency domain, so as to reduce the frequency leakage. A clustering is performed for the data from all of the channels, in order to intercept wideband signals. Simulation results show the validity of the proposed architecture.

关 键 词：信道化接收机 时-频分析 滑动DFT 短时傅里叶变换 

分 类 号：TN858[电子电信—信息与通信工程]