Search results for: Mario Caron

Items from 1 to 11 out of 11 results

article

Blind Self-Calibration Technique for I/Q Imbalances and DC-Offsets

Zhiwen Zhu, Xinping Huang, Mario Caron, Henry Leung

IEEE Transactions on Circuits and Systems I: Regular Papers > 2014 > 61 > 6 > 1849 - 1859

The gain/phase imbalances and DC-offsets in the in-phase and quadrature branches in direct conversion transmitters (DCTs) are main sources of errors, especially at microwave frequencies and above. These impairments distort the spectrum of the transmitted signal and degrade the communications performance. In this paper, a blind technique based on higher order statistics is proposed to estimate the...

chapter

Multi-carrier LINC amplifier calibration by min-minimum criterion

Xinping Huang, Mario Caron

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013) > 1135 - 1138

2013 IEEE International Symposium on Circuits and Systems (ISCAS)

In this paper, we briefly introduce the LINC amplifier, and discuss its mismatch issues that reduce its linearity and degrade its performance. A calibration approach for the LINC amplifier is proposed for multi-carrier system applications such as OFDM systems. The technique estimates the LINC amplifier calibration coefficient from the LINC amplifier output signal envelope by using a min-minimum criterion...

article

A Blind AM/PM Estimation Method for Power Amplifier Linearization

Zhiwen Zhu, Xinping Huang, Mario Caron, Henry Leung

IEEE Signal Processing Letters > 2013 > 20 > 11 > 1042 - 1045

A higher order statistics (HOS)-based method is proposed in this letter to estimate the nonlinear amplitude-to-phase (AM/PM) conversion function of power amplifiers (PAs) in communications systems. By utilizing the symmetry property of the modulated signal, the proposed method estimates the AM/PM conversion function using only the PA output signal, from which the phase predistorter (PD) function can...

article

Theoretical and Experimental Studies of a Probabilistic-Based Memoryless PA Linearization Technique

Zhiwen Zhu, Xinping Huang, Mario Caron

Circuits, Systems, and Signal Processing > 2013 > 32 > 6 > 3031-3057

This paper studies the performance of a memoryless power amplifier (PA) linearization technique based on a probabilistic approach. This technique employs a nonparametric method to derive a predistorter function, which does not need any parametric modeling and explicit parameter estimation. It only needs to calculate a probabilistic cumulative distribution function (CDF) and a quantile function (an...

chapter

Statistics-based LINC amplifier calibration

Xinping Huang, Mario Caron

2012 IEEE International Symposium on Circuits and Systems > 1247 - 1250

2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012

In this paper, we describe the LINC amplifier concept, and discuss gain and phase mismatch issues that reduce its linearity and degrade its performance. A self-calibration approach for the LINC amplifier is proposed, which is based on minimizing a distortion measure of its output signal in the statistical domain. Computer simulations are carried out to validate the proposed LINC amplifier calibration...

article

Analytical Performance of M-PSK Communications Systems in the Presence of Gain/Phase Imbalances and DC-Offsets

Zhiwen Zhu, Xinping Huang, Mario Caron

IEEE Wireless Communications Letters > 2012 > 1 > 4 > 404 - 407

This letter addresses the performance of M-PSK communications systems in the presence of gain/phase imbalances and DC-offsets in in-phase and quadrature channels. A model is established to represent the gain/phase imbalances and DC-offsets in both the transmitter and the receiver, and two closed-form formulas are derived to calculate the symbol error rate (SER) of the M-PSK communications systems...

chapter

A type-based equalization technique for frequency response distortion compensation

Xinping Huang, Mario Caron

2012 IEEE Radio and Wireless Symposium > 187 - 190

2012 IEEE Radio and Wireless Symposium (RWS)

In this paper, we present a patent pending type-based equalizer estimation technique to compensate for in-band amplitude and group delay distortions in analog/RF circuits. Its underlining principle is that for a given modulation scheme and pulse-shaping function, the modulated signal has a unique statistical distribution, and that any in-band amplitude and group delay variations in the circuit distort...

article

Type-Based Group Delay Equalization Technique

Xinping Huang, Mario Caron

IEEE Transactions on Circuits and Systems I: Regular Papers > 2011 > 58 > 7 > 1661 - 1670

This paper presents a patented type-based group- delay equalization technique to compensate for in-band group- delay distortion typically existing in analog/RF filter circuits. The underlining principle is that for a given modulation scheme and pulse-shaping function, the modulated signal has a unique statistical distribution, and that when the modulated signal passes through a circuit, any in-band...

chapter

Ka-Band Multi-port Power Amplifier Calibration Experiment and Results

Zhiwen Zhu, Xinping Huang, Mario Caron

2010 Second International Conference on Advances in Satellite and Space Communications > 11 - 14

Second International Conference on Advances in Satellite and Space Communications (SPACOMM 2010)

A multi-port power amplifier (MPA) is a multi-input multi-output system that is capable of amplifying multiple input signals simultaneously by a set of shared power amplifiers without mutual interference. In a practical MPA, the component imperfections reduce the port isolation, which introduces leakage or cross-port interference. A patent-pending type-based calibration technique is studied in this...

chapter

Efficient Transmitter Self-Calibration and Amplifier Linearization Techniques

Xinping Huang, Mario Caron

2007 IEEE International Symposium on Circuits and Systems > 265 - 268

2007 IEEE International Symposium on Circuits and Systems

This paper shows how RF circuit imperfections such as imbalances in the quadrature vector modulator and nonlinearities in the power amplifier can be effectively mitigated digitally at baseband. Two patented techniques, one for vector modulator calibration, and the other for power amplifier linearization, are described. Simulation and experimental results are included to demonstrate the performance...

chapter

A statistical approach to generate propagation fade time series

Mario Caron

2006 First European Conference on Antennas and Propagation > 1 - 6

2006 First European Conference on Antennas and Propagation Conference

A methodology is presented to generate a propagation fade time series based on the hypothesis that the fade rate statistics fully determine the attenuation and the fade duration statistics and thus allow to generate time series not only replicating statistically the events of a measured fade time series but also allowing to generate events embedded into its statistics but not evidenced. The approach...

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INFONA - science communication portal

Search results for: Mario Caron

Blind Self-Calibration Technique for I/Q Imbalances and DC-Offsets

Multi-carrier LINC amplifier calibration by min-minimum criterion

A Blind AM/PM Estimation Method for Power Amplifier Linearization

Theoretical and Experimental Studies of a Probabilistic-Based Memoryless PA Linearization Technique

Statistics-based LINC amplifier calibration

Analytical Performance of M-PSK Communications Systems in the Presence of Gain/Phase Imbalances and DC-Offsets

A type-based equalization technique for frequency response distortion compensation

Type-Based Group Delay Equalization Technique

Ka-Band Multi-port Power Amplifier Calibration Experiment and Results

Efficient Transmitter Self-Calibration and Amplifier Linearization Techniques

A statistical approach to generate propagation fade time series

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Search results for: Mario Caron

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