Vishnu Unnikrishnan

According to our database, Vishnu Unnikrishnan authored at least 53 papers between 2014 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2024

Digital Polar Transmitters for Massive MIMO: Sum-Rate and Power Efficiency Analysis.

Guixian Xu, Vesa Lampu, Marko Kosunen, Vishnu Unnikrishnan, Jussi Ryynänen, Mikko Valkama, Lauri Anttila

IEEE Trans. Wirel. Commun., January, 2024

Reconfigurable Signal Processing and DSP Hardware Generator for 5G and Beyond Transmitters.

Agnimesh Ghosh, Andrei Spelman, Tze Hin Cheung, Dhanashree Boopathy, Kari Stadius, Manil Dev Gomony, Mikko Valkama, Jussi Ryynänen, Marko Kosunen, Vishnu Unnikrishnan

IEEE Trans. Very Large Scale Integr. Syst., January, 2024

2023

Multilevel Outphasing With Over-the-Air Combining in Large Antenna Arrays.

Vesa Lampu, Guixian Xu, Alberto Brihuega, Marko Kosunen, Vishnu Unnikrishnan, Jussi Ryynänen, Christian Fager, Mikko Valkama, Lauri Anttila

IEEE Trans. Commun., December, 2023

Prediction meets time series with gaps: User clusters with specific usage behavior patterns.

Miro Schleicher, Vishnu Unnikrishnan, Rüdiger Pryss, Johannes Schobel, Winfried Schlee, Myra Spiliopoulou

Artif. Intell. Medicine, August, 2023

High-Precision Time-to-Digital Conversion for Calibration of Outphasing Radio Transmitters.

Dhanashree Boopathy, Tze Hin Cheung, Andrei Spelman, Agnimesh Ghosh, Vesa Lampu, Lauri Anttila, Kari Stadius, Marko Kosunen, Jussi Ryynänen, Vishnu Unnikrishnan

Proceedings of the 21st IEEE Interregional NEWCAS Conference, 2023

A Similarity-Guided Framework for Error-Driven Discovery of Patient Neighbourhoods in EMA Data.

Vishnu Unnikrishnan, Miro Schleicher, Clara Puga, Rüdiger Pryss, Carsten Vogel, Winfried Schlee, Myra Spiliopoulou

Proceedings of the Advances in Intelligent Data Analysis XXI, 2023

Predicting Patient-Based Time-Dependent Mobile Health Data.

Anna Kleinau, Simon Flügel, Rüdiger Pryss, Carsten Vogel, Milena Engelke, Winfried Schlee, Vishnu Unnikrishnan, Myra Spiliopoulou

Proceedings of the 36th IEEE International Symposium on Computer-Based Medical Systems, 2023

2022

Energy-Efficient Cyclic-Coupled Ring Oscillator With Delay-Based Injection Locking.

Okko Järvinen, Vishnu Unnikrishnan, Ilia Kempi, Santeri Porrasmaa, Kari Stadius, Marko Kosunen, Jussi Ryynänen

IEEE Trans. Circuits Syst. II Express Briefs, 2022

True-Time-Delay Receiver IC With Reconfigurable Analog and Digital Beamforming.

Kalle Spoof, Miikka Tenhunen, Vishnu Unnikrishnan, Kari Stadius, Marko Kosunen, Jussi Ryynänen

IEEE Access, 2022

Reconfigurable Signal Processing and DSP Hardware Generator for 5G Transmitters.

Agnimesh Ghosh, Andrei Spelman, Tze Hin Cheung, Dhanashree Boopathy, Vishnu Unnikrishnan, Vesa Lampu, Guixian Xu, Lauri Anttila, Kari Stadius, Marko Kosunen, Jussi Ryynänen

Proceedings of the IEEE Nordic Circuits and Systems Conference, NorCAS 2022, Oslo, 2022

A 2 GS/s 9-bit Time-Interleaved SAR ADC with Overlapping Conversion Steps.

Miikka Tenhunen, Kalle Spoof, Vishnu Unnikrishnan, Kari Stadius, Marko Kosunen, Jussi Ryynänen

Proceedings of the 20th IEEE Interregional NEWCAS Conference, 2022

A 0.9-Nyquist-Band Digital Timing Mismatch Correction for Time-Interleaved ADCs Achieving Delay Tuning Range of 0.12-Sample-Period.

Ilia Kempi, Okko Järvinen, Marko Kosunen, Vishnu Unnikrishnan, Kari Stadius, Jussi Ryynänen

Proceedings of the IEEE International Symposium on Circuits and Systems, 2022

Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution.

Okko Järvinen, Vishnu Unnikrishnan, Ilia Kempi, Kari Stadius, Marko Kosunen, Jussi Ryynänen

Proceedings of the IEEE International Symposium on Circuits and Systems, 2022

A 0.8-6 GHz True-Time-Delay Beam-Nulling Receiver Front-End.

Kalle Spoof, Miikka Tenhunen, Vishnu Unnikrishnan, Kari Stadius, Marko Kosunen, Jussi Ryynänen

Proceedings of the 29th IEEE International Conference on Electronics, Circuits and Systems, 2022

Discovering Instantaneous Granger Causalities in Non-stationary Categorical Time Series Data.

Noor Jamaludeen, Vishnu Unnikrishnan, André Brechmann, Myra Spiliopoulou

Proceedings of the Artificial Intelligence in Medicine, 2022

2021

Data Conversion With Subgate-Delay Time Resolution Using Cyclic-Coupled Ring Oscillators.

Vishnu Unnikrishnan, Okko Järvinen, Waqas Siddiqui, Kari Stadius, Marko Kosunen, Jussi Ryynänen

IEEE Trans. Very Large Scale Integr. Syst., 2021

Interactive System for Similarity-Based Inspection and Assessment of the Well-Being of mHealth Users.

Subash Prakash, Vishnu Unnikrishnan, Rüdiger Pryss, Robin Kraft, Johannes Schobel, Ronny Hannemann, Berthold Langguth, Winfried Schlee, Myra Spiliopoulou

Entropy, 2021

A 100-750 MS/s 11-Bit Time-to-Digital Converter With Cyclic-Coupled Ring Oscillator.

Okko Järvinen, Vishnu Unnikrishnan, Waqas Siddiqui, Teuvo Korhonen, Kimmo Koli, Kari Stadius, Marko Kosunen, Jussi Ryynänen

IEEE Access, 2021

Discovery of Patient Phenotypes through Multi-layer Network Analysis on the Example of Tinnitus.

Clara Puga, Uli Niemann, Vishnu Unnikrishnan, Miro Schleicher, Winfried Schlee, Myra Spiliopoulou

Proceedings of the 8th IEEE International Conference on Data Science and Advanced Analytics, 2021

Love thy Neighbours: A Framework for Error-Driven Discovery of Useful Neighbourhoods for One-Step Forecasts on EMA data.

Vishnu Unnikrishnan, Yash Shah, Miro Schleicher, Carlos Fernández-Viadero, Mirela Strandzheva, Doroteya Velikova, Plamen Dimitrov, Rüdiger Pryss, Johannes Schobel, Winfried Schlee, Myra Spiliopoulou

Proceedings of the 34th IEEE International Symposium on Computer-Based Medical Systems, 2021

User-centric vs whole-stream learning for EMA prediction.

Saijal Shahania, Vishnu Unnikrishnan, Rüdiger Pryss, Robin Kraft, Johannes Schobel, Ronny Hannemann, Winny Schlee, Myra Spiliopoulou

Proceedings of the 34th IEEE International Symposium on Computer-Based Medical Systems, 2021

Circadian Conditional Granger Causalities on Ecological Momentary Assessment Data from an mHealth App.

Noor Jamaludeen, Vishnu Unnikrishnan, Rüdiger Pryss, Johannes Schobel, Winfried Schlee, Myra Spiliopoulou

Proceedings of the 34th IEEE International Symposium on Computer-Based Medical Systems, 2021

Energy-Efficient Array Transmitters Through Outphasing and Over-the-Air Combining.

Vesa Lampu, Guixian Xu, Lauri Anttila, Alberto Brihuega, Marko Kosunen, Vishnu Unnikrishnan, Jussi Ryynänen, Mikko Valkama

Proceedings of the 55th Asilomar Conference on Signals, Systems, and Computers, 2021

2020

True-Time-Delay Beamforming Receiver With RF Re-Sampling.

Kalle Spoof, Vishnu Unnikrishnan, Mahwish Zahra, Kari Stadius, Marko Kosunen, Jussi Ryynänen

IEEE Trans. Circuits Syst., 2020

Time-Based Sensor Interface for Dopamine Detection.

Olaitan Olabode, Marko Kosunen, Vishnu Unnikrishnan, Tommi Palomäki, Tomi Laurila, Kari Halonen, Jussi Ryynänen

IEEE Trans. Circuits Syst., 2020

Resilient flow control for wireless data streaming in inductively coupled medical implants.

Ilia Kempi, Nouman Ahmed, Andreas Hammer, Olaitan Olabode, Vishnu Unnikrishnan, Marko Kosunen, Jussi Ryynänen

Microprocess. Microsystems, 2020

Entity-level stream classification: exploiting entity similarity to label the future observations referring to an entity.

Vishnu Unnikrishnan, Christian Beyer, Pawel Matuszyk, Uli Niemann, Rüdiger Pryss, Winfried Schlee, Eirini Ntoutsi, Myra Spiliopoulou

Int. J. Data Sci. Anal., 2020

Resource management for model learning at entity level.

Christian Beyer, Vishnu Unnikrishnan, Robert Brüggemann, Vincent Toulouse, Hafez Kader Omar, Eirini Ntoutsi, Myra Spiliopoulou

Ann. des Télécommunications, 2020

Active feature acquisition on data streams under feature drift.

Christian Beyer, Maik Büttner, Vishnu Unnikrishnan, Miro Schleicher, Eirini Ntoutsi, Myra Spiliopoulou

Ann. des Télécommunications, 2020

Assessing the Difficulty of Labelling an Instance in Crowdworking.

Neetha Jambigi, Tirtha Chanda, Vishnu Unnikrishnan, Myra Spiliopoulou

Proceedings of the ECML PKDD 2020 Workshops, 2020

Injection Locking of Ring Oscillators with Digitally Controlled Delay Modulation.

Vishnu Unnikrishnan, Okko Järvinen, Kari Stadius, Marko Kosunen, Jussi Ryynänen

Proceedings of the IEEE International Symposium on Circuits and Systems, 2020

Multivariate Time Series as Images: Imputation Using Convolutional Denoising Autoencoder.

Abdullah Al Safi, Christian Beyer, Vishnu Unnikrishnan, Myra Spiliopoulou

Proceedings of the Advances in Intelligent Data Analysis XVIII, 2020

Predicting the Health Condition of mHealth App Users with Large Differences in the Number of Recorded Observations - Where to Learn from?

Vishnu Unnikrishnan, Yash Shah, Miro Schleicher, Mirela Strandzheva, Plamen Dimitrov, Doroteya Velikova, Rüdiger Pryss, Johannes Schobel, Winfried Schlee, Myra Spiliopoulou

Proceedings of the Discovery Science - 23rd International Conference, 2020

2019

Exploiting entity information for stream classification over a stream of reviews.

Christian Beyer, Vishnu Unnikrishnan, Uli Niemann, Pawel Matuszyk, Eirini Ntoutsi, Myra Spiliopoulou

Proceedings of the 34th ACM/SIGAPP Symposium on Applied Computing, 2019

A Sensor Interface for Neurochemical Signal Acquisition.

Olaitan Olabode, Marko Kosunen, Vishnu Unnikrishnan, Tommi Palomäki, Tomi Laurila, Kari Halonen, Jussi Ryynänen

Proceedings of the 62nd IEEE International Midwest Symposium on Circuits and Systems, 2019

Assessing the Reliability of Crowdsourced Labels via Twitter.

Noor Jamaludeen, Vishnu Unnikrishnan, Maya S. Sekeran, Majed Ali, Le Anh Trang, Myra Spiliopoulou

Proceedings of the Conference on "Lernen, Wissen, Daten, Analysen", Berlin, Germany, September 30, 2019

A Delay-Based LO Phase-Shifting Generator for a 2-5GHz Beamsteering Receiver in 28nm CMOS.

Yury Antonov, Mikko Valkama, Marko Kosunen, Jussi Ryynänen, Mahwish Zahra, Kari Stadius, Zahra Khonsari, Ilia Kempi, Toni Miilunpalo, Juha Inkinen, Vishnu Unnikrishnan, Lauri Anttila

Proceedings of the 45th IEEE European Solid State Circuits Conference, 2019

2018

Predicting polarities of entity-centered documents without reading their contents.

Christian Beyer, Uli Niemann, Vishnu Unnikrishnan, Eirini Ntoutsi, Myra Spiliopoulou

Proceedings of the 33rd Annual ACM Symposium on Applied Computing, 2018

A Configurable Hysteresis Comparator for Asynchronous Sigma-Delta Modulators.

Olaitan Olabode, Vishnu Unnikrishnan, Ilia Kempi, Andreas Hammer, Marko Kosunen, Jussi Ryynänen

Proceedings of the 2018 IEEE Nordic Circuits and Systems Conference, 2018

A Low-Power Hardware Stack for Continuous Data Streaming from Telemetry Implants.

Ilia Kempi, Nouman Ahmed, Andreas Hammer, Olaitan Olabode, Vishnu Unnikrishnan, Marko Kosunen, Jussi Ryynänen

Proceedings of the 2018 IEEE Nordic Circuits and Systems Conference, 2018

A 3-43ps time-delay cell for LO phase-shifting in 1.5-6.5GHz beamsteering receiver.

Yury Antonov, Mahwish Zahra, Kari Stadius, Zahra Khonsari, Nouman Ahmed, Ilia Kempi, Juha Inkinen, Vishnu Unnikrishnan, Jussi Ryynänen

Proceedings of the 16th IEEE International New Circuits and Systems Conference, 2018

Ring Counters as Phase Accumulator in VCO-Based ADCs.

Mark Vesterbacka, Vishnu Unnikrishnan

Proceedings of the 25th IEEE International Conference on Electronics, Circuits and Systems, 2018

A VCO-based ADC with Relaxation Oscillator for Biomedical Applications.

Olaitan Olabode, Antti Ontronen, Vishnu Unnikrishnan, Marko Kosunen, Jussi Ryynänen

Proceedings of the 25th IEEE International Conference on Electronics, Circuits and Systems, 2018

2017

Mitigation of Sampling Errors in VCO-Based ADCs.

Vishnu Unnikrishnan, Mark Vesterbacka

IEEE Trans. Circuits Syst. I Regul. Pap., 2017

2016

Design of VCO-based ADCs.

Vishnu Unnikrishnan

PhD thesis, 2016

Design of a VCO-based ADC in 28 nm CMOS.

Vishnu Unnikrishnan, Mark Vesterbacka

Proceedings of the IEEE Nordic Circuits and Systems Conference, 2016

Linearization of VCO-based ADCs using asynchronous sigma-delta modulation.

Vishnu Unnikrishnan, Mark Vesterbacka

Proceedings of the IEEE 59th International Midwest Symposium on Circuits and Systems, 2016

Mixed-Signal Design Using Digital CAD.

Vishnu Unnikrishnan, Mark Vesterbacka

Proceedings of the IEEE Computer Society Annual Symposium on VLSI, 2016

VCO-based ADCs for IoT applications.

Vishnu Unnikrishnan, Mark Vesterbacka, Atila Alvandpour

Proceedings of the International Symposium on Integrated Circuits, 2016

2015

A NAND gate based standard cell VCO for use in synthesizable ADCs.

Vishnu Unnikrishnan, Mark Vesterbacka

Proceedings of the Nordic Circuits and Systems Conference, 2015

A fully synthesized all-digital VCO-based analog-to-digital converter.

Vishnu Unnikrishnan, Srinivasa Rao Pathapati, Mark Vesterbacka

Proceedings of the Nordic Circuits and Systems Conference, 2015

Linearization of synthesizable VCO-based ADCs using delta modulation.

Vishnu Unnikrishnan, Mark Vesterbacka

Proceedings of the European Conference on Circuit Theory and Design, 2015

2014

Time-Mode Analog-to-Digital Conversion Using Standard Cells.

Vishnu Unnikrishnan, Mark Vesterbacka

IEEE Trans. Circuits Syst. I Regul. Pap., 2014