Baseband I/Q regeneration method for direct conversion receiver to nullify effect of second order intermodulation distortion

M. Shah, Sanjeev Gupta
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Abstract

Direct Conversion Receiver is the choice of the today's designer for design of low power and compact wireless receiver. Direct Conversion Receiver is attractive due to low power, small size and highly monolithic integratable structure, but distortions affect its performance. Second order Intermodulation distortion is the one of the major distortion which is responsible for performance degradation. In this paper, a novel method for Direct Conversion Receiver is suggested, which makes it insensitive to the Second order Intermodulation distortion. Results demonstrate that proposed method is able to remove Second-Order Intermodulation distortion effectively and improve adjacent channel rejection by 10dB. Here the classical homodyne architecture is modified to nullify effect of Second order Intermodulation distortion. The proposed method can be implemented in the Digital Signal Processing (DSP) back-end section also. This feature makes it acceptable in the already designed/functioning classical homodyne architecture based receiver.
直接转换接收机基带I/Q再生方法以消除二阶互调失真的影响
直接转换接收机是当今设计人员设计低功耗和紧凑型无线接收机的选择。直接转换接收机因其低功耗、小尺寸和高度单片可集成的结构而受到人们的青睐,但其性能受到畸变的影响。二阶互调失真是导致性能下降的主要失真之一。本文提出了一种直接转换接收机对二阶互调失真不敏感的新方法。结果表明,该方法能够有效地消除二阶互调失真,并将相邻信道抑制提高10dB。本文对经典的同差结构进行了改进,以消除二阶互调失真的影响。该方法也适用于数字信号处理(DSP)后端部分。该特性使其在已经设计/运行的基于经典同差架构的接收机中可以接受。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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