Frequency-selective IQ imbalance in zero-second-IF transceivers for wide-band mmW links

  1. Ainhoa Rezola 12
  2. Juan Francisco Sevillano 12
  3. David Del Río 12
  4. Iñaki Guruceaga 12
  5. Roc Berenguer 12
  6. Igone Vélez 12
  1. 1 Centro de Estudios e Investigaciones Técnicas de Gipuzkoa
    info

    Centro de Estudios e Investigaciones Técnicas de Gipuzkoa

    San Sebastián, España

    ROR https://ror.org/022wqqf69

  2. 2 Universidad de Navarra
    info

    Universidad de Navarra

    Pamplona, España

    ROR https://ror.org/02rxc7m23

Revista:
International Journal of Communications

ISSN: 1998-4480

Ano de publicación: 2015

Volume: 9

Páxinas: 98 - 104

Tipo: Artigo

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Outras publicacións en: International Journal of Communications

Resumo

This article deals with the analysis and mitigation of one of the most prominent impairments found in wideband zerosecond-IF transceivers, namely frequency-selective IQ imbalance. IQ imbalance can significantly reduce the performance of a communication system if it is not appropriately compensated. This article presents a mathematical analysis, followed by a compensation technique. Compensation processing, known as predistortion, takes place at the digital baseband and it is based on test tones and spectral measurements. The compensation strategy facilitates automatic IQ imbalance compensation procedure and it requires a minimum of extra hardware. The performance of the algorithm is evaluated in a transceiver with 64-QAM modulation and 1GHz of bandwidth implemented with real hardware. The results presented in the article suggest that the use of this technique is able to mitigate the impact of the IQ imbalance effects in wideband systems.