Markus Gardill

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To capture the dispersive effect of reverberation by Hidden Markov Model (HMM)-based distant-talking speech recognition systems, adapting the means of the current HMM state based on the means of the preceding states has been suggested in [1]. In this contribution, we propose to incorporate the reverberation models of [2] into the adaptation approach to(More)
This paper presents a cross-correlation-based synchronization architecture between the clock of the receiver and the transmitter of ultra-wideband systems. The proposed architecture is based on M-sequence signals instead of the conventional impulse signals. The M-sequence generator and the analog correlation circuit are fabricated on-chip using a low-cost(More)
We generally categorize the approaches for ultrawideband antenna array design, and consequently propose simplified concepts for antenna arrays for a high-precision, ultra-wideband FMCW radar 2-D local positioning system to obtain robustness against multi path interference, perform angle of arrival analysis, as well as instantaneous heading estimation. We(More)
In this contribution, we numerically investigate if the quasi-stationary (QS) response is a valid approximation for the response of antennas excited by wideband linear-frequency modulated continuous waveforms. We give results for two idealized example systems, showing how the validity of the QS response is dependent on the system's resonant behavior. It(More)
Low latency and highest transmission reliability are the key challenges for enabling time-critical industrial wireless applications, e.g. in factory automation. Both are significantly determined by the rough and dynamic environmental conditions as well as regulatory limitation of spectrum access in unlicensed frequency bands, especially in the 2.4 GHz(More)
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