IQ imbalance estimation scheme in the presence of DC offset and frequency offset in the frequency domain

Mamiko Inamori, Shuzo Takayama, Yukitoshi Sanada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.

Original languageEnglish
Pages (from-to)2688-2696
Number of pages9
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE92-A
Issue number11
DOIs
Publication statusPublished - 2009 Nov

Fingerprint

Frequency Offset
Frequency Domain
Filter
Orthogonal Frequency Division multiplexing (OFDM)
Bit error rate
Orthogonal frequency division multiplexing
Error Rate
Time Domain
Receiver
Computer Simulation
Numerical Results
Computer simulation

Keywords

  • DC offset
  • Direct conversion
  • Frequency offset
  • IQ imbalance
  • OFDM
  • Pilot symbols

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics
  • Signal Processing

Cite this

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