Phase and gain imbalance compensation in low-IF receivers

Teruji Ide, Takeo Fujii, Mamiko Inamori, Yukitoshi Sanada

    Research output: Contribution to journalArticle


    In this paper, we present a modified image rejection method that uses imbalance compensation techniques for phase and gain in low-intermediate frequency (IF) software-defined radio (SDR) receivers. In low-IF receivers, the image frequency signal interferes with the desired signal owing to the phase and gain imbalances caused by analog devices. Thus, it is difficult to achieve the required image rejection ratio (IRR) of over 60 dB without compensation. To solve this problem, we present modified blind compensation techniques based on digital signal processing using a feedback control loop with a practical computation process. The modified method can reduce the complexity when a hardware logic circuit is used, like an FPGA. The simulation and experimental results verify that the modified method achieves an IRR greater than 50-60 dB for both the carrier and the modulated waves.

    Original languageEnglish
    Pages (from-to)211-223
    Number of pages13
    JournalIEICE Transactions on Communications
    Issue number1
    Publication statusPublished - 2016 Jan 1


    • Image rejection
    • Low-IF receiver
    • Phase and gain imbalance
    • SDR

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Computer Networks and Communications
    • Software

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