## Christian Vogel

- Room number
- IDEG110
- Position
- Adjunct Professor
- vogel@tugraz.at

Christian Vogel was born in Graz, Austria, in 1975. He received the Dipl.-Ing. degree in telematics, the Dr. techn. degree in electrical engineering, and the Venia Docendi in analog and digital signal processing from Graz University of Technology, Austria in 2001, 2005, and 2013, respectively. From 2006 to 2007 Dr. Vogel was Assistant Professor at Graz University of Technology, from 2008 to 2009 he was an Erwin Schrödinger postdoctoral research fellow at the S ignal and Information Processing Laboratory at ETH Zurich, Switzerland, and from 2010 to 2014 he was key researcher at the Telecommunications Research Center Vienna (FTW). He is currently head of the insitute of electronic engineering and leading the degree program electronics and computer engineering at FH Joanneum - University of Applied Sciences, Austria and Adjunct Professor at Graz University of Technology, Austria. His research interests include the theory and design of digital, analog, and mixed-signal processing systems with emphasis on communications systems and digital enhancement techniques. He worked on all-digital phased-locked loops, transmitter architectures, digital predistortion, vehicular communications, GPS receivers, and factor graphs, but is most known for his contributions to the understanding and further development of time-interleaved ADCs. Dr. Vogel is author and co-author of more than 70 international journal and conference papers, holds several international patents, and is the co-author of five papers that have received best paper awards including the 2009 IEEE Circuits and Systems Society Outstanding Young Author Award and the 2014 IEEE Circuits and Systems Darlington Best Paper Award.

## Research Programs

## Research Projects

## Student Projects

- Master Theses at FTW(open)
- Analysis of the SB-ZePoC Method for RF Transmitters
- Reconstruction Methods for Time-Varying Systems
- Sampling of Sparse Analog Signals
- Interpolation Filters for the GNURadio+USRP2 Platform
- A Study of Tube Amplifier Modeling Using Nonlinear Wave Digital Filters
- Reconstruction of Nonuniformly Sampled Signals
- Fixed-Point Algorithms for Channel Mismatch Calibration of Time-Interleaved Analog-to-Digital Converters

## PhD Theses

- Modeling, Identification, and Compensation of Channel Mismatch Errors in Time-Interleaved Analog-to-Digital Converters
- Behavioral Modeling and Digital Predistortion of Radio Frequency Power Amplifiers
- Measurement Methods for Estimating the Error Vector Magnitude in OFDM Transceivers
- Signal Processing for Burst‐Mode RF Transmitter Architectures

## Publications

- Article Enzinger H., Freiberger K. & Vogel C. (2018)
**Competitive linearity for envelope tracking**. in*IEEE Microwave Magazine*,*19(1)*, p. 69. [more info] [doi] - Conference contribution Freiberger K., Enzinger H. & Vogel C. (2017)
**The error power ratio estimates EVM for a wide class of impairments**. in*Proceedings of the 2017 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, INMMiC 2017*. [more info] [doi] - Article Freiberger K., Enzinger H. & Vogel C. (2017)
**A Noise Power Ratio Measurement Method for Accurate Estimation of the Error Vector Magnitude**. in*IEEE transactions on microwave theory and techniques*,*65(5)*, p. 1632-1645. [more info] [doi] - Paper Enzinger H., Freiberger K. & Vogel C. (2016)
**A joint linearity-efficiency model of radio frequency power amplifiers**.. [more info] - Conference contribution Freiberger K., Wolkerstorfer M., Enzinger H. & Vogel C. (2015)
**Digital predistorter identification based on constrained multi-objective optimization of WLAN standard performance metrics**. in*Proceedings of the 2015 IEEE International Symposium on Circuits and Systems*(pp. 862-865). [more info] [doi] - Conference contribution Enzinger H., Freiberger K. & Vogel C. (2015)
**Analysis of even-order terms in memoryless and quasi-memoryless polynomial baseband models**. in*Proceedings of the 2015 IEEE International Symposium on Circuits and Systems*(pp. 1714-1717). [more info] [doi] - Conference contribution Hotz M. & Vogel C. (2014)
**Block Processing with Iterative Correction Filters for Time-Interleaved ADCs**. in*Proceedings of the 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)*(pp. 4961-4965). [more info] [doi] - Conference contribution Enzinger H. & Vogel C. (2014)
**Analytical Description of Multilevel Carrier-Based PWM of Arbitrary Bounded Input Signals**. in*Proceedings of the 2014 IEEE International Symposium on Circuits and Systems (ISCAS 2014)*(pp. 1030-1033). [more info] [doi] - (Old data) Lecture or Presentation Singerl P., Mataln M., Schuberth C., Dielacher F., Seebacher D., Vogel C. & Hausmair K. (2013)
**Implementation of a 2.6 GHz, 5-W Carrier Bursting Switched Mode Transmitter**.. [more info] - Conference contribution Hausmair K., Chi S. & Vogel C. (2013)
**How to reach 100% coding efficiency in multilevel burst-mode RF transmitters**. in*Proceedings of the 2013 IEEE International Symposium on Circuits and Systems (ISCAS 2013)*(pp. 2255-2258). [more info] [doi] - Conference contribution Chi S., Hausmair K. & Vogel C. (2013)
**Coding efficiency of bandlimited PWM based burst-mode RF transmitters**. in*Proceedings of the 2013 IEEE International Symposium on Circuits and Systems*(pp. 2263-2266). [more info] [doi] - Habilitation Vogel C. (2013)
**Digitally Enhanced Mixed-Signal Processing Systems**.. [more info] - Article Geiger B. & Vogel C. (2013)
**Influence of Doppler Bin Width on GPS Acquisition Probabilities**. in*IEEE transactions on aerospace and electronic systems*,*49(4)*, p. 2570-2584. [more info] [doi] - Other report Bolliger L., Loeliger H. & Vogel C. (2013)
**LMMSE estimation and interpolation of continuous-time signals from discrete-time samples using factor graphs**.. [more info] - Article Hausmair K., Chi S., Singerl P. & Vogel C. (2013)
**Aliasing-Free Digital Pulse-Width Modulation for Burst-Mode RF Transmitters**. in*IEEE transactions on circuits and systems / Regular papers*,*60(2)*, p. 415-427. [more info] [doi] - Article Chi S., Singerl P. & Vogel C. (2013)
**Efficiency Optimization for Burst-Mode Multilevel Radio Frequency Transmitters**. in*IEEE transactions on circuits and systems / Regular papers*,*60(7)*, p. 1901-1914. [more info] [doi] - Conference contribution Vogel C., Hotz M., Saleem S., Hausmair K. & Soudan M. (2012)
**A Review on Low-Complexity Structures and Algorithms for the Correction of Mismatch Errors in Time-Interleaved ADCs**. in*2012 IEEE 10th International New Circuits and Systems Conference (NEWCAS)*(pp. 349-352). [more info] [doi] - Conference contribution Bernadó L., Zemen T., Czink N., Fuxjäger P., Sanchez F., Shivaldova V., Mecklenbräuker C., Paier A., Smely D., Jandrisits M., Rainer B. & Vogel C. (2012)
**Wireless Communications for Intelligent Transportation Systems**. in*19th ITS World Congress*(pp. 1-9). [more info] - Patent Vogel C. & Singerl P. (2012)
**System and Method for Generating a Pulse-width Modulated Signal**.. [more info] - Article Soudan M. & Vogel C. (2012)
**Correction Structures for Linear Weakly Time-Varying Systems**. in*IEEE transactions on circuits and systems / Regular papers*,*59(9)*, p. 2075-2084. [more info] [doi] - Article Geiger B., Vogel C. & Soudan M. (2012)
**A Comparison Between Ratio Detection and Threshold Comparison for GNSS Acquisition**. in*IEEE transactions on aerospace and electronic systems*,*48(2)*, p. 1772-1779. [more info] [doi] - Conference contribution Chi S., Singerl P. & Vogel C. (2011)
**Coding Efficiency Optimization for Multilevel PWM Based Switched-Mode RF Transmitters**. in*Proceedings of the 54th Midwest Symposium on Circuits and Systems (MWSCAS 2011)*(pp. 1-4). [more info] [doi] - Conference contribution Soudan M. & Vogel C. (2011)
**On the Correction of Linear Time-varying Systems by Means of Time-varying FIR Filters**. in*Proceedings of the 54th Midwest Symposium on Circuits and Systems (MWSCAS 2011)*(pp. 1-4). [more info] [doi] - Conference contribution Soudan M. & Vogel C. (2011)
**Low Complexity Least-Squares Filter Design for the Correction of Linear Time-varying Systems**. in*Circuit Theory and Design (ECCTD 2011)*(pp. 690-693). [more info] [doi] - Article Saleem S. & Vogel C. (2011)
**Adaptive Blind Background Calibration of Polynomial-Represented Frequency Response Mismatches in a Two-Channel Time-Interleaved ADC**. in*IEEE transactions on circuits and systems / Regular papers*,*58(6)*, p. 1300-1310. [more info] [doi] - Article Zemen T., Czink N., Bernadó L. & Vogel C. (2011)
**Funkkommunikation für intelligente Verkehrssysteme - Status und Ausblick**. in*e&i - Elektrotechnik und Informationstechnik*,*128(7-8)*, p. 276-281. [more info] [doi] - (Old data) Lecture or Presentation Vogel C., Nordström T., Trautmann S. & Kubin G. (2010)
**Energy Efficient Analog Front Ends for Access Networks through Digital Signal Processing - A Contribution to Green ICT**.. [more info] - Conference contribution Saleem S. & Vogel C. (2010)
**Adaptive Compensation of Frequency Response Mismatches in High-Resolution Time-Interleaved ADCs using a Low-Resolution ADC and a Time-Varying Filter**. in*2010 IEEE International Symposium on Circuits and Systems*(pp. 561-564). [more info] - Conference contribution Chi S., Vogel C. & Singerl P. (2010)
**The Frequency Spectrum of Polar Modulated PWM Signals and the Image Problem**. in*Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2010)*(pp. 685-688). [more info] [doi] - Conference contribution Bolliger L., Loeliger H. & Vogel C. (2010)
**Simulation, MMSE estimation, and interpolation of sampled continuous-time signals using factor graphs**. in*Information Theory and Applications Workshop*(pp. 1-4). [more info] - Conference contribution Geiger B., Soudan M. & Vogel C. (2010)
**On the Detection Probability of Parallel Code Phase Search Algorithms in GPS Receivers**. in*IEEE International Symposium on Personal, Indoor and Mobile Radio Communications*(pp. 864-869). [more info] - Conference contribution Berglez P., Seybold J., Geiger B., Soudan M., Vogel C., Abart C., Singh A. & Hofmann-Wellenhof B. (2010)
**Development of a Dual Frequency Software-based GNSS Receiver**. in*Proceedings of the ION GNSS 2010*(pp. 1967-1974). [more info] - Conference contribution Saleem S. & Vogel C. (2010)
**On Blind Identification of Gain and Timing Mismatches in Time-Interleaved Analog-to-Digital Converters**. in*Proceedings of 33rd International Conference on Telecommunications and Signal Processing (TSP 2010)*(pp. 151-155). [more info] - Patent Mendel S. & Vogel C. (2010)
**Frequency to Phase Converter with Uniform Sampling for all Digital Phase Locked Loops**.. [more info] - Chapter Vogel C. (2010)
**A Signal Processing View on Time-interleaved ADCs**. Springer, 1 ed.. [more info] - Conference contribution Dielacher F., Vogel C., Singerl P., Mendel S. & Wiesbauer A. (2009)
**A Holistic Design Approach for Systems on Chip**. in*IEEE International SOC Conference*(pp. 301-306). [more info] - Conference contribution Johansson H. & Vogel C. (2009)
**Efficient design and implementation of sampling rate conversion, resampling, and signal reconstruction**. in*International Conference on Sampling Theory and Applications*(pp. 1-4). [more info] - Conference contribution Mendel S., Vogel C. & Dalt N. (2009)
**Signal and Timing Analysis of a Phase-Domain All-Digital Phase-Locked Loop with Reference Retiming Mechanism**. in*16th International Conference on Mixed Design of Integrated Circuits and Systems*(pp. 681-687). [more info] - Article Vogel C. & Krall C. (2009)
**Digital Compensation of In-Band Image Signals Caused by M-Periodic Nonuniform Zero-Order Hold Signals**. in*Ubiquitous computing and communication journal*, p. 1-10. [more info] - Article Vogel C. & Mendel S. (2009)
**A Flexible and Scalable Structure to Compensate Frequency Response Mismatches in Time-Interleaved ADCs**. in*IEEE transactions on circuits and systems / Regular papers*,*56(11)*, p. 2463-2475. [more info] [doi] - Article Vogel C., Mendel S., Singerl P. & Dielacher F. (2009)
**Digital Signal Processing for Data Converters in Mixed-Signal Systems**. in*e&i - Elektrotechnik und Informationstechnik*,*126(11)*, p. 390-395. [more info] [doi] - Article Mendel S., Vogel C. & Dalt N. (2009)
**A Phase-Domain All-Digital Phase-Locked Loop Architecture without Reference Clock Retiming**. in*IEEE transactions on circuits and systems / Express briefs*,*56(11)*, p. 860-864. [more info] - Conference contribution Vogel C., Saleem S. & Mendel S. (2008)
**Adaptive Blind Compensation of Gain and Timing Mismatches in M-Channel Time-Interleaved ADCs**. in*IEEE International Conference on Electronics, Circuits and Systems*(pp. 49-52). [more info] - Conference contribution Mendel S. & Vogel C. (2008)
**Improved Lock-Time in All-Digital Phase-Locked Loops due to Binary Search Acquisition**. in*IEEE International Conference on Electronics, Circuits and Systems*(pp. 384-387). [more info] - Conference contribution Vogel C. & Krall C. (2008)
**Compensation of Distortions Caused by Periodic Nonuniform Holding Signals**. in*Proceedings of the 6th Symposium on Communication Systems, Networks and Digital Signal Processing*(pp. 152-155). [more info] - Conference contribution Vogel C. (2008)
**Compensation of Two-periodic Nonuniform Holding Signal Distortions by Using a Variable FIR Filter**. in*Proceedings of the International Conference on Signals and Electronic Systems (ICSES 2008)*(pp. 323-326). [more info] - Conference contribution Murmann B., Vogel C. & Koeppl H. (2008)
**Digitally Enhanced Analog Circuits: System Aspects**. in*2008 IEEE International Symposium on Circuits and Systems, ISCAS*(pp. 560-563). [more info] - Article Tertinek S. & Vogel C. (2008)
**Reconstruction of Nonuniformly Sampled Bandlimited Signals Using a Differentiator-Multiplier Cascade**. in*IEEE transactions on circuits and systems / Regular papers*,*55(8)*, p. 2273-2286. [more info] [doi] - Conference contribution Krall C., Vogel C. & Witrisal K. (2007)
**Time-Interleaved Digital-to-Analog Converters for UWB Signal Generation**. in*International Conference on Ultra Wide-Band*(pp. ---). [more info] - Conference contribution Mendel S. & Vogel C. (2007)
**On the Compensation of Magnitude Response Mismatches in M-channel Time-interleaved ADCs**. in*2007 IEEE International Symposium on Circuits and Systems, ISCAS*(pp. 3375-3378). [more info] - Conference contribution Mendel S. & Vogel C. (2007)
**A z-Domain Model and Analysis of Phase-Domain All-Digital Phase-Locked Loops**. in*Proceedings of the IEEE NORCHIP Conference*(pp. 1-4). [more info] - Conference contribution Saleem S. & Vogel C. (2007)
**LMS-Based Identification and Compensation of Timing Mismatches in a Two-Channel Time-Interleaved Analog-to-Digital Converter**. in*Proceedings of the IEEE Norchip Conference*(pp. 1-4). [more info] - Patent Vogel C. & Draxelmayr D. (2007)
**System for reconstruction of non-uniformly sampled signals**.. [more info] - Article Tertinek S. & Vogel C. (2007)
**Reconstruction of Two-Periodic Nonuniformly Sampled Bandlimited Signals Using a Discrete-Time Differentiator and a Time-Varying Multiplier**. in*IEEE transactions on circuits and systems / Express briefs*,*54(7)*, p. 616-620. [more info] [doi] - Conference contribution Mendel S. & Vogel C. (2006)
**A Compensation Method for Magnitude Response Mismatches in Two-Channel Time-Interleaved Analog-to-Digital Converters**. in*IEEE International Conference on Electronics, Circuits and Systems*(pp. 712-715). [more info] - Conference contribution Vogel C. (2006)
**A Frequency Domain Method for Blind Identification of Timing Mismatches in Time-Interleaved ADCs**. in*Proceedings of the IEEE NORCHIP Conference*(pp. 45-48). [more info] - Conference contribution Vogel C. & Johansson H. (2006)
**Time-Interleaved Analog-to-Digital Converters: Status and Future Directions**. in*2006 IEEE International Symposium on Circuits and Systems, ISCAS*(pp. 3386-3389). [more info] - Patent Vogel C., Draxelmayr D. & Kubin G. (2006)
**Zeitversetzt arbeitender Analog-Digital-Wandler**.. [more info] - Patent Vogel C., Kubin G. & Draxelmayr D. (2006)
**Analog-to-digital converter operable with staggered timing**.. [more info] - Conference contribution Vogel C., Draxelmayr D. & Kubin G. (2005)
**Spectral Shaping of Timing Mismatches in Time-Interleaved ADCs**. in*2005 IEEE International Symposium on Circuits and Systems, ISCAS*(pp. 1394-1397). [more info] - Conference contribution Vogel C., Pammer V. & Kubin G. (2005)
**A Novel Channel Randomization Method for Time-Interleaved ADCs**. in*IEEE Instrumentation and Measurement Technology Conference*(pp. 150-155). [more info] - Conference contribution Singerl P. & Vogel C. (2005)
**A Fast and Accurate Automatic Gain Control for a Wireless Local Area Network Receiver**. in*Proceedings of the 2005 Global Mobile Congress*(pp. 34-38). [more info] - Patent Vogel C., Draxelmayr D. & Kuttner F. (2005)
**Schaltungsanordnung zum Kompensieren von Nichtlinearitäten von zeitversetzt arbeitenden Analog-Digital-Wandler**.. [more info] - Patent Draxelmayr D., Vogel C. & Kuttner F. (2005)
**Circuit arrangement for compensation for nonlinearities from analog/digital converters operating with different timing**.. [more info] - Patent Vogel C., Draxelmayr D. & Kuttner F. (2005)
**Schaltungsanordnung zum Verzögerungsabgleich von zeitversetzt arbeitenden Analog-Digital-Wandlern**.. [more info] - Patent Vogel C., Draxelmayr D. & Kuttner F. (2005)
**Circuit arrangement for the delay adjustment of analog-to-digital converters operating in a temporally offset manner**.. [more info] - Doctoral Thesis Vogel C. (2005)
**Modeling, Identification, and Compensation of Channel Mismatch Errors in Time-Interleaved Analog-to-Digital Converters**.. [more info] - Article Vogel C. & Kubin G. (2005)
**Modeling of Time-interleaved ADCs with Nonlinear Hybrid Filter Banks**. in*AEÜ = International Journal of Electronics and Communications*,*59(5)*, p. 288-296. [more info] [doi] - Article Vogel C. (2005)
**The Impact of Combined Channel Mismatch Effects in Time-Interleaved ADCs**. in*IEEE transactions on instrumentation and measurement*,*54(1)*, p. 415-427. [more info] [doi] - Conference contribution Vogel C. & Kubin G. (2004)
**Analysis and Compensation of Nonlinearity Mismatches in Time-Interleaved ADC Arrays**. in*2004 IEEE International Symposium on Circuits and Systems, ISCAS*(pp. 593-596). [more info] - Conference contribution Singerl P. & Vogel C. (2004)
**An Analysis of a Low Complexity Received Signal Strength Indicator for Wireless Applications**. in*Austrochip 2004*(pp. 57-60). [more info] - Conference contribution Vogel C., Draxelmayr D. & Kuttner F. (2004)
**Compensation of Timing Mismatches in Time-Interleaved Analog-to-Digital Converters through Transfer Characteristics Tuning**. in*47th IEEE International Midwest Symposium On Circuits and Systems*(pp. 349-352). [more info] - Conference contribution Vogel C. & Kubin G. (2004)
**Time-Interleaved ADCs in the Context of Hybrid Filter Banks**. in*2004 International Symposium on Signals, Systems, and Electronics ISSSE'04*(pp. 214-217). [more info] - Commissioned report Vogel C. (2004)
**Work report on the project Digital Correction of Analog Signal Processing Errors in Fast Analog-to-Digital Converters**.. [more info] - Conference contribution Vogel C. & Köppl H. (2003)
**Behavioral Modeling of Time-Interleaved ADCs using MATLAB**. in*Austrochip 2003*(pp. 45-48). [more info] - Commissioned report Vogel C. (2003)
**Work report on the project Digital Correction of Analog Signal Processing Errors in Fast Analog-to-Digital Converters**.. [more info] - Diploma Thesis Vogel C. (2001)
**Urheberrechtsschutz im digitalen Zeitalter: Analyse der technischen Möglichkeiten**.. [more info]