基于数字补偿的快速频率合成方法的研究  

A Fast frequency synthesizer technique based on digital Pre-compensatation

作　　者：房启志[1] 张盱昊[2] 罗海明[2] 耿爽[3] 

机构地区：[1]沈阳航空工业学院电子工程系,辽宁沈阳110034 [2]电信科学技术研究院,北京100083 [3]东北微电子研究所,辽宁沈阳110032

出　　处：《沈阳航空工业学院学报》2007年第1期65-67,40,共4页Journal of Shenyang Institute of Aeronautical Engineering

摘　　要：基于I/Q调制的快速频率合成方法比目前采用的频率合成方法更易调试,而且使用灵活。其思路是将信号先通过单边带调制,将较低频率调制到需要的频率范围;然后采用对基带信号的数字预补偿方法来抑制镜像频率和载波泄漏,从而达到应用的目的。文章中还给出一种基于输出信号包络信息的补偿系数调整算法,其仿真结果说明该新补偿算法可以有效抑制镜像频率和载波泄漏。A frequency synthesizer technique based on L/Q adjustment makes it easier to debug and use comparing with the ongoing method. First, a low frequency tone is up- converted to the needed frequency range by means of SSB （ single side band modulation）. Then we perform digital pre - compensation method, which can be used in the processing of base band signal to reject image frequency and protect carrier leak to meet the ap- plication purpose. Furthermore, an algorithm according to the envelope of out signals for updating the compensator coefficients is proposed. Simulation results illustrate the excellent performance of the proposed pre - compensation structure can significantly reject image frequency and protect carrier leak.

关 键 词：快速频率合成 镜像频率 载波泄漏 数字预补偿 

分 类 号：TN957.52[电子电信—信号与信息处理]