Advanced methods for I/Q imbalance compensation in communication receivers
- M. Valkama, M. Renfors, V. Koivunen
- BusinessIEEE Transactions on Signal Processing
- 1 October 2001
The results indicate that the I/Q imbalance can be effectively compensated during the normal operation of the receiver even in the rapidly changing case, as long as a linear system model for the imbalance is valid.
Circularity-Based I/Q Imbalance Compensation in Wideband Direct-Conversion Receivers
- L. Anttila, M. Valkama, M. Renfors
- BusinessIEEE Transactions on Vehicular Technology
- 15 July 2008
Two novel blind low-complexity I/Q imbalance compensation techniques are proposed and analyzed to digitally enhance the analog FE image attenuation in wideband direct-conversion receivers and can provide very good compensation performance with low computational resources and are robust in the face of different imbalance levels and dynamics of the received signals.
Full-Duplex Transceiver System Calculations: Analysis of ADC and Linearity Challenges
- D. Korpi, T. Riihonen, Ville Syrjälä, L. Anttila, M. Valkama, R. Wichman
- Computer ScienceIEEE Transactions on Wireless Communications
- 15 January 2014
It is observed that the nonlinear distortion produced by the transmitter PA is a significant issue in a full-duplex transceiver and, when using cheaper and less linear components, also the receiver chain nonlinearities become considerable.
Frequency-Selective I/Q Mismatch Calibration of Wideband Direct-Conversion Transmitters
- L. Anttila, M. Valkama, M. Renfors
- EngineeringIEEE Transactions on Circuits and Systems - II…
- 15 April 2008
This brief focuses on digital-signal-processor-based I/Q mismatch calibration in wideband direct-conversion transmitters, assuming the challenging case of frequency-dependent I/ Q mismatch, and proposes two alternative principles for calibration parameter estimation.
Widely Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver
- D. Korpi, L. Anttila, Ville Syrjälä, M. Valkama
- BusinessIEEE Journal on Selected Areas in Communications
- 25 February 2014
The analysis shows that after realistic antenna isolation and RF cancellation, the dominant self-interference waveform at the receiver digital baseband can be modeled through a widely linear transformation of the original transmit data, opposed to classical purely linear models.
Joint Mitigation of Power Amplifier and I/Q Modulator Impairments in Broadband Direct-Conversion Transmitters
- L. Anttila, P. Handel, M. Valkama
- EngineeringIEEE transactions on microwave theory and…
- 15 March 2010
In this paper, we present a novel digital predistorter structure for joint mitigation of frequency-dependent power amplifier (PA) and in-phase and quadrature (I/Q) modulator impairments in…
Blind signal estimation in conjugate signal models with application to I/Q imbalance compensation
- M. Valkama, M. Renfors, V. Koivunen
- EngineeringIEEE Signal Processing Letters
- 17 October 2005
It will be shown that blind signal recovery in this kind of signal model is feasible using only the second-order statistics of the observed signal, under the assumption of circular or proper complex signals.
Nonlinear self-interference cancellation in MIMO full-duplex transceivers under crosstalk
- D. Korpi, L. Anttila, M. Valkama
- EngineeringEURASIP Journal on Wireless Communications and…
- 2 February 2017
The signal model utilized by the canceller is capable of modeling the in-phase quadrature (IQ) imbalance, the nonlinearity of the transmitter power amplifier, and the crosstalk between the transmitters, thereby being the most comprehensive signal model presented thus far within the full-duplex literature.
Recent advances in antenna design and interference cancellation algorithms for in-band full duplex relays
- M. Heino, D. Korpi, M. Valkama
- BusinessIEEE Communications Magazine
- 14 May 2015
Novel state-of-the-art antenna solutions as well as digital self-interference cancellation algorithms for compact MIMO full-duplex relays, specifically targeted for reduced-cost deployments in local area networks are presented.
Full-duplex mobile device: pushing the limits
- D. Korpi, J. Tamminen, M. Valkama
- Computer ScienceIEEE Communications Magazine
- 13 October 2014
The findings indicate that deploying the full-duplex principle can indeed also be feasible in mobile devices, and thus be one potential technology in, for example, 5G and beyond radio systems.
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