Transceiver I/Q imbalance self-calibration with phase-shifted local loopback for multichannel microwave backhaul

Xiaojing Huang, Y. Jay Guo, Jian A. Zhang

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Frequency-dependent I/Q imbalance estimation and compensation are of significant practical importance to low-cost wideband systems with an I/Q modulation architecture. To enable multichannel transmission without inter-channel interference, transmitter I/Q imbalance must be pre-compensated to meet stringent transmit mask requirement. In this paper, a simple frequency domain joint transmitter and receiver I/Q imbalance estimation method is proposed for self-calibration of such wideband multichannel transceivers. Using two frequency domain training signals and a phase shifter inserted in the transceiver local loopback channel, the transmitter and receiver I/Q imbalances can be estimated separately. The estimation errors are also analyzed and the mean square error lower bounds are derived. Simulation results are in good agreement with analytical ones. Compared with existing methods, the proposed technique demonstrates better image rejection performance and quicker adaptation to parameter changes, making it more applicable to many wireless systems, especially the multichannel microwave backhaul, for achieving high data rates with high-order modulation and wide transmission bandwidth.

Original languageEnglish
Pages (from-to)7657-7669
Number of pages13
JournalIEEE Transactions on Wireless Communications
Issue number11
Publication statusPublished - 1 Nov 2016
Externally publishedYes


  • multichannel backhaul
  • I/Q imbalance
  • image rejection
  • self-calibration


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