Publications de Vladimir Kopta

Ultra Low Power FM-UWB Transceiver for High-Density Wireless Sensor Networks

The WiseSkin project aims to provide a non-invasive solution for restoration of a natural sense of touch to persons using prosthetic limbs. By embedding sensor nodes into the silicone coating of the prosthesis, which acts as a sensory skin, WiseSkin target ...

EPFL2018

A 100 kb/s, 4 GHz, 267 mu W Fully Integrated Low Power FM-UWB Transceiver with Multiple Channels

Christian Enz, Vladimir Kopta

A 4 GHz, 100 kb/s FM-UWB transceiver for short-range communications in a body area network is presented. Two receivers and a transmitter use the same RF port with a fully-integrated matching network. The first receiver provides multi-user communication cap ...

IEEE2018

FM-UWB: Towards a Robust, Low-Power Radio for Body Area Networks

Christian Enz, John Farserotu, Vladimir Kopta

The Frequency Modulated Ultra-Wideband (FM-UWB) is known as a low-power, low-complexity modulation scheme targeting low to moderate data rates in applications such as wireless body area networks. In this paper, a thorough review of all FM-UWB receivers and ...

2017

Efficient through-waveguide wireless power transfer for body area networks

Christian Enz, John Farserotu, Vladimir Kopta

2017

An Approximate Zero IF FM-UWB Receiver for High Density Wireless Sensor Networks

Christian Enz, Vladimir Kopta

A low-power frequency modulated-ultra-wideband (FM-UWB) receiver for short-range communications, capable of simultaneously demodulating multiple FM-UWB signals located at the same frequency, is presented in this paper. The proposed receiver utilizes an "ap ...

Institute of Electrical and Electronics Engineers2017

A 420 mu W, 4 GHz Approximate Zero IF FM-UWB Receiver for Short-Range Communications

Christian Enz, Vladimir Kopta

A low-power FM-UWB receiver intended for short range communications in wireless sensor networks is presented in this paper. It utilizes an "approximate zero IF" architecture which combines a free-running ring oscillator as the RF LO with a modified delay-l ...

Ieee2016

Are We Modular Lying Cues Detectors? The Answer Is "Yes, Sometimes"

Mathieu Arminjon, Vladimir Kopta, Amer Chamseddine, Aleksandar Paunovic, Christine Mohr

We quickly form first impressions about newly encountered people guiding our subsequent behaviour (approach, avoidance). Such instant judgments might be innate and automatic, being performed unconsciously and independently to other cognitive processes. Lyi ...

Public Library of Science2015

A 2.4-GHz low complexity polar transmitter using dynamic biasing for IEEE 802.15.6

Christian Enz, Raghavasimhan Thirunarayanan, Vladimir Kopta, Franz Xaver Pengg

A 2.4 GHz polar transmitter compliant with the IEEE 802.15.6 standard is presented in this paper. A Linearized class-C power amplifier, employing dynamic biasing is used to minimize the adjacent channel interference and satisfy the defined spectrum mask re ...

IEEE2015

Tactile Prosthetics in WiseSkin

Christian Enz, Stéphanie Lacour, Vladimir Kopta

IEEE Conference Publications2015

The WiseSkin artificial skin for tactile prosthetics: A power budget investigation

Christian Enz, Vladimir Kopta

The use of prosthetic hands are limited partly due to the fact that they lack the provision of sensory feedback to the user. A first step to providing sensory feedback is having adequate sensors in the prosthesis. The WiseSkin project targets the use of ar ...

IEEE2014

A 2.4-GHz low power polar transmitter for wireless body area network applications

Christian Enz, Vladimir Kopta, Franz Xaver Pengg

A 2.4 GHz low power polar transmitter is proposed in this paper. A dynamic biasing circuit, controlled by a digital envelope signal, is used as a direct digital-to-RF envelope converter. It effectively linearizes the input-output characteristic of the over ...

Springer Verlag2014

A 2.4-GHz low power polar transmitter for wireless body area network applications

Christian Enz, Vladimir Kopta, Franz Xaver Pengg

A 2.4-GHz low power polar transmitter architecture is proposed in this paper. A dynamic biasing circuit, controlled by a digital envelope signal, is used to linearize the input-output characteristic of the overdriven class-C power amplifier. A model of the ...

2013