基于零中频构架的OFDM射频调制系统设计
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摘要
针对正交频分复用(OFDM)信号功率谱旁瓣干扰大以及数模转换(DAC)引起的镜频干扰,设计了一种基于AD9364射频收发芯片有效抑制带外干扰的OFDM射频调制系统。首先设计数字插值滤波器对信号进行内插处理,从而分离镜频;再通过高阶模拟低通滤波器滤除镜频,同时抑制OFDM信号旁瓣,加速旁瓣衰减。最后测试结果表明了所设计的OFDM射频调制系统能够有效抑制镜频及带外干扰,获得清晰准确的射频传输信号频谱。且节省了额外的FPGA资源,设计方案简单实用。
Orthogonal frequency division multiplexing(OFDM)signal has large sidelobe on its power spectrum,and digital to analog converter(DAC)brings the image frequencies interference. Aiming to this issue,an OFDM RF modulation system with out-of-band emission reduction is designed based on AD9364 RF transceiver chip. Digital interpolation filter is designed for separating the image frequencies.Then,the image frequencies can be eliminated by high order analog low pass filter,and the OFDM sidelobes can also be controlled at the meantime. The final test result shows that the OFDM RF modulation system designed can effectively restrain the image frequencies and out-of-band interference,and obtain a clear accurate RF transmission signal spectrum.This design saves the extra FPGA resources and the design is simple and practical.
Orthogonal frequency division multiplexing(OFDM)signal has large sidelobe on its power spectrum,and digital to analog converter(DAC)brings the image frequencies interference. Aiming to this issue,an OFDM RF modulation system with out-of-band emission reduction is designed based on AD9364 RF transceiver chip. Digital interpolation filter is designed for separating the image frequencies.Then,the image frequencies can be eliminated by high order analog low pass filter,and the OFDM sidelobes can also be controlled at the meantime. The final test result shows that the OFDM RF modulation system designed can effectively restrain the image frequencies and out-of-band interference,and obtain a clear accurate RF transmission signal spectrum.This design saves the extra FPGA resources and the design is simple and practical.
引文
[1]Rahmatallah Y,Mohan S.Peak-to-average powerratio reduction in OFDM systems:A survey andtaxonomy[J].IEEE communications surveys&tutorials,2013,15(4):1567-1592.
[2]王清波.非线性功放条件下的恒包络OFDM系统性能[J].电信科学,2016,32(9):120-124.
[3]彭俊宇,蔡孙增,朱正航,等.基于MIMO-OFDM的高频段Gbit/s通信系统设计和实现[J].电信科学,2014,30(6):95-101.
[4]程波.认知OFDM信号旁瓣抑制算法研究[D].北京:北京交通大学,2013.
[5]周惠忠.一种镜像频率干扰抑制接收机系统设计[J].电子技术,2016,45(11):104-106.
[6]王超.相位平衡式镜频抑制混频器的ADS仿真与设计[J].舰船电子工程,2013,33(10):48-51.
[7]赵文文,李跃华.Ka波段相位平衡式镜频抑制混频器的设计[C]//全国军事微波技术暨太赫兹技术学术会议,2014.
[8]胡荣骅,杨士义.镜频抑制混频器设计中的相位优化[J].电子设计工程,2016(1):80-81.
[9]黄锦沛,唐宗熙,吴韵秋,等.Ka波段镜像抑制谐波混频器设计[J].半导体技术,2012(12):53-57.
[10]管玉龙.Ka波段谐波混频器设计与仿真[D].成都:电子科技大学,2012.
[11]Bouhamame M,Coco L L,Amiot S,et al.A 60d B harmonic rejection mixer for digital terrestrialTV tuner[J].IEEE Transactions on Circuits andSystems I:Regular Papers,2012,59(3):471-478.
[12]郭凡玉.K波段镜频抑制谐波混频器的研究[D].成都:电子科技大学,2012.
[13]杜海旺,马亮亮,陈晓阳.宽带镜频抑制混频器应用研究[J].电子设计工程,2012,20(23):87-89.
[14]Cheng X,He Y,Ge B,et al.A Filtered OFDMUsing FIR Filter Based on Window FunctionMethod[C]//Vehicular Technology Conference(VTC Spring),2016 IEEE 83rd.IEEE,2016:1-5.
[15]张军.模拟与数字信号的正交调制原理与实现[J].电子世界,2016(15):48-49.
[16]郭萌萌.一款200MS视频DAC电路的设计与实现[D].西安:西安电子科技大学,2012.
[17]张艳军,杨晟飞,杨祯.一种无谐波检测的中频有源电力滤波器[J].陕西电力,2016(12):73-75,88.
[18]李玲俐.智能保健监测系统中音频信号的分类算法研究[J].重庆师范大学学报:自然科学版,2012(4):73-76.
[2]王清波.非线性功放条件下的恒包络OFDM系统性能[J].电信科学,2016,32(9):120-124.
[3]彭俊宇,蔡孙增,朱正航,等.基于MIMO-OFDM的高频段Gbit/s通信系统设计和实现[J].电信科学,2014,30(6):95-101.
[4]程波.认知OFDM信号旁瓣抑制算法研究[D].北京:北京交通大学,2013.
[5]周惠忠.一种镜像频率干扰抑制接收机系统设计[J].电子技术,2016,45(11):104-106.
[6]王超.相位平衡式镜频抑制混频器的ADS仿真与设计[J].舰船电子工程,2013,33(10):48-51.
[7]赵文文,李跃华.Ka波段相位平衡式镜频抑制混频器的设计[C]//全国军事微波技术暨太赫兹技术学术会议,2014.
[8]胡荣骅,杨士义.镜频抑制混频器设计中的相位优化[J].电子设计工程,2016(1):80-81.
[9]黄锦沛,唐宗熙,吴韵秋,等.Ka波段镜像抑制谐波混频器设计[J].半导体技术,2012(12):53-57.
[10]管玉龙.Ka波段谐波混频器设计与仿真[D].成都:电子科技大学,2012.
[11]Bouhamame M,Coco L L,Amiot S,et al.A 60d B harmonic rejection mixer for digital terrestrialTV tuner[J].IEEE Transactions on Circuits andSystems I:Regular Papers,2012,59(3):471-478.
[12]郭凡玉.K波段镜频抑制谐波混频器的研究[D].成都:电子科技大学,2012.
[13]杜海旺,马亮亮,陈晓阳.宽带镜频抑制混频器应用研究[J].电子设计工程,2012,20(23):87-89.
[14]Cheng X,He Y,Ge B,et al.A Filtered OFDMUsing FIR Filter Based on Window FunctionMethod[C]//Vehicular Technology Conference(VTC Spring),2016 IEEE 83rd.IEEE,2016:1-5.
[15]张军.模拟与数字信号的正交调制原理与实现[J].电子世界,2016(15):48-49.
[16]郭萌萌.一款200MS视频DAC电路的设计与实现[D].西安:西安电子科技大学,2012.
[17]张艳军,杨晟飞,杨祯.一种无谐波检测的中频有源电力滤波器[J].陕西电力,2016(12):73-75,88.
[18]李玲俐.智能保健监测系统中音频信号的分类算法研究[J].重庆师范大学学报:自然科学版,2012(4):73-76.