A reduced-complexity heterodyne multiband MIMO receiver with estimation of analog devices imperfection in a baseband feedback loop

Tomoya Ohta, Satoshi Denno, Masahiro Morikura

Research output: Contribution to journalArticle

1 Citation (Scopus)


This paper proposes a reduced-complexity multiband multiple-input multiple-output (MIMO) receiver that can be used in cognitive radios. The proposed receiver uses heterodyne reception implemented with a wide-passband band-pass filter in the radio frequency (RF) stage. When an RF Hilbert transformer is utilized in the receiver, image-band interference occurs because of the transformer's imperfections. Thus, the imperfection of the Hilbert transformer is corrected in the intermediate frequency (IF) stage to reduce the hardware complexity. First, the proposed receiver estimates the channel impulse response in the presence of the strong image-band interference signals. Next, the coefficients are calculated for the correction of the imperfection at the IF stage, and are fed back to the IF stage through a feedback loop. However, the imperfection caused by the digital-to-analog (D/A) converter and the baseband amplifier in the feedback loop corrupts the coefficients on the way back to the IF stage. Therefore, the proposed receiver corrects the imperfection of the analog devices in the feedback loop. The performance of the proposed receiver is verified by using computer simulations. The proposed receiver can maintain its performance even in the presence of strong image-band interference signals and imperfection of the analog devices in the feedback loop. In addition, this paper also reveals the condition for rapid convergence.

Original languageEnglish
Pages (from-to)1540-1550
Number of pages11
JournalIEICE Transactions on Communications
Issue number6
Publication statusPublished - Jun 2013



  • Analog devices imperfection in a feedback loop
  • Cognitive radio
  • Heterodyne multiband receiver
  • Multiple-input multiple-output
  • Raising frequency utilization efficiency

ASJC Scopus subject areas

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

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