A low complexity heterodyne multiband MIMO receiver with baseband automatic gain control

Tomoya Ohta, Satoshi Denno, Masahiro Morikura

Research output: Contribution to journalArticle

Abstract

This paper proposes a novel heterodyne multiband multiple-input multiple-output (MIMO) receiver with baseband automatic gain control (AGC) for cognitive radios. The proposed receiver uses heterodyne reception implemented with a wide-passband band-pass filter in the radio frequency (RF) stage to be able to receive signals in arbitrary frequency bands. Even when an RF Hilbert transformer is utilized in the receiver, image-band interference occurs due to the imperfection of the Hilbert transformer. In the receiver, analog baseband AGC is introduced to prevent the baseband signals exceeding the voltage reference of analogto- digital converters (ADCs). This paper proposes a novel technique to estimate the imperfection of the Hilbert transformer in the heterodyne multiband MIMO receiver with baseband AGC. The proposed technique estimates not only the imperfection of the Hilbert transformer but also the AGC gain ratio, and analog devices imperfection in the feedback loop, which enables to offset the imperfection of the Hilbert transformer. The performance of the proposed receiver is verified by using computer simulations. As a result, the required resolution of the ADC is 9 bits in the proposed receiver. Moreover, the proposed receiver has less computational complexity than that with the baseband interference cancellation unless a frequency band is changed every 9 packets or less.

Original languageEnglish
Pages (from-to)3124-3134
Number of pages11
JournalIEICE Transactions on Communications
VolumeE96-B
Issue number12
DOIs
Publication statusPublished - Dec 2013

Keywords

  • Analog devices imperfection in a feedback loop
  • Baseband automatic gain control
  • Cognitive radio
  • Heterodyne multiband receiver
  • Multiple-input multiple-output

ASJC Scopus subject areas

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

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