Université de Neuchâtel

Asymptotical Analysis of Timing Imperfections in UWB Receivers

Merz, Roman ; Botteron, Cyril ; Farine, Pierre-André ; Farserotu, John

In: 2nd IEEE International Conference on Circuits and Systems for Communications (ICCSC’2004), 2004, vol. 2, p. 1-4

In this paper, a model is proposed to analyze the influence of timing imperfections on ultra-wide bandwith (UWB) time-hopping spread-spectrum (TH-SS) signaling schemes, where N pulses are coherently added to increase the received signal-to-noise ratio (SNR). Based on this model, we derive asymptotical (valid for large N) expressions for the received signal after pulse summation and matched...

Université de Neuchâtel

Multiuser interference during synchronization phase in UWB impulse radio

Merz, Roman ; Botteron, Cyril ; Farine, Pierre-André

In: IEEE International Conference on Ultra-Wideband (ICU), 2005, p. 661-666

This paper analyzes the receiver's ability to differentiate between multiple users in ultra-wideband (UWB) impulse radio (IR) during the initial synchronization phase after a cold start, i.e., when the receiver is not yet synchronized with the user of interest. Because of multiple access interference (MAI), the receiver may combine the pulses of other users in a partially coherent way. In this...

Université de Neuchâtel

Analysis of low power, low data rate ultra wideband impulse radio systems

Merz, Roman ; Farine, Pierre-André (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th.2071.

During the last decade, ultra wideband (UWB) systems gained a large interest in the scientific world because of their suitability to realize among others communication systems with tremendous data rates and accurate indoor positioning and location systems. As a differing technology compared to classical narrowband radio transmission systems, UWB requires some novel approaches. Well established...

Université de Neuchâtel

Surface profiles of reflow microlenses under the influence of surface tension and gravity

Schilling, Andreas ; Merz, Roman ; Ossmann, Christian ; Herzig, Hans-Peter

In: Optical Engineering, 2000, vol. 39, no. 8, p. 2171-2176

We present a finite-element method to calculate 3-D surface profiles of refractive microlenses fabricated by melting-resist technology (reflow technique). The geometry of the microlenses can be arbitrary. Surface tension and gravity are taken into account. Gravity can have an advantageous influence on the profile form, so that smaller focal spots can be achieved. A simple scaling law is given to...

See also: similar author names
1 Merz, Ruben