A Novel Adaptive Calibration Scheme for Frequency-Selective I/Q Imbalance in Broadband Direct-Conversion Transmitters

Luo, Jian; Kortke, Andreas; Keusgen, Wilhelm; Valkama, Mikko

doi:10.1109/tcsii.2012.2235735

Cited by 24 publications

(18 citation statements)

References 9 publications

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“…There are number of other adaptive compensators which are suitable for higher baud-rate block data transfer; interested readers may refer to [11]- [22].…”

Section: Existing Solutions For Mismatch Compensationmentioning

confidence: 99%

Blind Adaptive Compensation of I/Q Mismatch and Frequency Offset in Low-IF Receivers

Abrar

Zerguine

Nandi

2014

2014 12th International Conference on Frontiers of Information Technology

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In this work, we present an adaptive non-dataaided compensator for the in-phase/quadrature-phase (I/Q) mismatch in low-intermediate frequency (heterodyne) receivers. In particular, the adaptive I/Q mismatch algorithm is derived by exploiting the uncorrelatedness between the desired and the image signals, and is used to compensate for gain imbalance and phase-offset error. Furthermore, the frequencyoffset error is separately compensated by using an adaptive minimization of a fourth-order statistics based cost function.

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“…There are number of other adaptive compensators which are suitable for higher baud-rate block data transfer; interested readers may refer to [11]- [22].…”

Section: Existing Solutions For Mismatch Compensationmentioning

confidence: 99%

Blind Adaptive Compensation of I/Q Mismatch and Frequency Offset in Low-IF Receivers

Abrar

Zerguine

Nandi

2014

2014 12th International Conference on Frontiers of Information Technology

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“…After several iterations, m 0 becomes zero in (10), and the iterative procedure in the I branch is described by…”

Section: Algorithm: Dm Compensation Of I/q Branchesmentioning

confidence: 99%

“…In [9], the mismatch between the reconstruction LPFs in the I/Q branches is estimated by Manuscript employing two paths in the feedback circuit. A calibration technique is presented in [10] to mitigate the frequency-selective I/Q impairment, including the DM with a mixer-based feedback circuit. A data-aided approach is presented to compensate for the I/Q impairment in orthogonal frequency-division multiplexing (OFDM) systems [7].…”

Section: Introductionmentioning

confidence: 99%

“…The proposed technique utilizes the instantaneous power measurement of the transmitted radio frequency (RF) signal to estimate and compensate for the DM. Therefore, it is applicable to the DCTs with different types of feedback circuits for the I/Q impairment compensation, such as demodulator-based [5], [6], mixer-based [10], and envelope-detector (ED)-based [4], [11] circuits. The ED-based circuit, which is used in this brief, mainly consists of a diode detector operated in its square-law region.…”

Section: Introductionmentioning

confidence: 99%

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Compensation of Delay Mismatch in a Direct Conversion Transmitter

Zhu

Huang

Leung

2014

IEEE Trans. Circuits Syst. II

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This brief analyzes the effects of the delay mismatch (DM) between in-phase (I) and quadrature (Q) branches of a direct conversion transmitter (DCT) on its image rejection capability. An iterative technique is proposed to compensate for the DM, based on the instantaneous power measurement of the DCT output signal. It is shown that the proposed compensation technique can obtain the true DM value even when the I/Q impairment exists in the DCT. Simulation results show that the proposed technique can effectively compensate for the DM, thereby improving the DCT performance. Index Terms-Correlation function, delay mismatch (DM), direct conversion transmitter (DCT), image rejection, interpolation filter.1549-7747

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“…Moreover, circuit modifications are possible only in a laboratory environment, and such modifications itself can change the imbalance values. Environmental factors, mainly temperature change, result in changes to the imbalance values over time [14]. This means that imbalance calibration should preferably be performed periodically or at least after each time the system is installed in a new environment.…”

Section: Introductionmentioning

confidence: 99%

Quadrature Imbalance Compensation With Ellipse-Fitting Methods for Microwave Radar Physiological Sensing

Zakrzewski

Singh

Yavari

et al. 2014

IEEE Trans. Microwave Theory Techn.

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Accurate displacement measurement using quadrature Doppler radar requires amplitudes and phase imbalance compensation. Previously, this imbalance calibration has required cumbersome hardware modifications and thus can only be performed in a laboratory setting. Recently, a data-based method that does not require hardware modifications has been proposed. This simplifies the calibration process and allows the calibration to be performed on-site periodically. The method is called ellipse fitting. In this paper, the different factors affecting imbalance estimation accuracy, namely, arc length, initial phase angle, and noise level were thoroughly investigated. The Levenberg-Marquardt (LM) algorithm is proposed for the first time to increase the estimation accuracy as compared to the previously suggested algebraic fitting. Comprehensive simulations and experimental data show that the algebraic fitting method results in biased estimates. The proposed LM method has also been demonstrated to be more robust to noise, varying arc lengths, and different initial angles. The LM method reaches sufficient imbalance estimation accuracy with an arc length of 40% and a noise level of 1.5%.

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A Novel Adaptive Calibration Scheme for Frequency-Selective I/Q Imbalance in Broadband Direct-Conversion Transmitters

Cited by 24 publications

References 9 publications

Blind Adaptive Compensation of I/Q Mismatch and Frequency Offset in Low-IF Receivers

Blind Adaptive Compensation of I/Q Mismatch and Frequency Offset in Low-IF Receivers

Compensation of Delay Mismatch in a Direct Conversion Transmitter

Quadrature Imbalance Compensation With Ellipse-Fitting Methods for Microwave Radar Physiological Sensing

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