无线发射机镜像抑制的Hilbert变换方法分析

Analysis of Hilbert conversion method of wireless transmitter image rejection

采用超外差结构的无线发射机都会产生镜像频谱分量,如果不采取抑制措施,必然对其他信道产生严重的干扰,同时带来发射机效率降低、浪费频谱资源等问题。镜像抑制一直是无线发射机设计中的重点问题。从无插值镜像及有插值镜像2个方面,分析了实现镜像频谱抑制的Hilbert变换方法,对无线发射机镜像频谱抑制的设计与实现具有重要的借鉴意义。

All wireless transmitters using heterodyne architecture will generate image spectrums, which causes considerable interferences to other channels, and brings such problems as transmitter efficiency falling, wasting spectrum resource, etc. Image rejection is a significant issue in wireless transmitter design. From the two aspects of having no interpolation images and having interpolation images, this paper analyzes the Hilbert conversion method of realizing image rejection, which is helpful for the design and implementation of wireless transmitter image rejection.