Compensation of frequency-selective I/Q imbalances in wideband receivers: models and algorithms
- 13 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
To achieve satisfactory performance in analog I/Q (inphase/quadrature) processing-based wireless receivers, the matching of amplitudes and phases of the I and Q branches becomes vital. In practice, there is always some imbalance and the image attenuation produced by the analog processing remains finite. Especially in wideband receivers, where the existence of strong image band signals makes the attenuation requirements extremely stringent, analog processing is incapable of providing adequate image rejection. We derive a general frequency-dependent signal model for an imbalanced analog front-end and present two alternative methods utilizing digital processing to enhance the analog front-end image rejection. Based on the obtained results, the proposed methods provide adequate image signal rejection with very few assumptions, even in the difficult cases of frequency-selective and/or time-varying imbalances.Keywords
This publication has 9 references indexed in Scilit:
- Digital I/Q imbalance compensation in a low-IF receiverPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Multichannel blind deconvolution and equalization using the natural gradientPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Advanced DSP for I/Q imbalance compensation in a low-IF receiverPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Blind source separation based I/Q imbalance compensationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Advanced methods for I/Q imbalance compensation in communication receiversIEEE Transactions on Signal Processing, 2001
- A novel adaptive mismatch cancellation system for quadrature IF radio receiversIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1999
- Software Radio ReceiversPublished by Springer Nature ,1999
- Low-IF topologies for high-performance analog front ends of fully integrated receiversIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1998
- Adaptive compensation for imbalance and offset losses in direct conversion transceiversIEEE Transactions on Vehicular Technology, 1993