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D'Angelo L.T.,TU Munich | Tarita E.,Biosigna GmbH | Zywietz T.K.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Lueth T.C.,TU Munich
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10 | Year: 2010

In this contribution, a system for internet based, automated home care ECG upload and priorisation is presented for the first time. It unifies the advantages of existing telemonitoring ECG systems adding functionalities such as automated priorisation and usability for home care. Chronic cardiac diseases are a big group in the geriatric field. Most of them can be easily diagnosed with help of an electrocardiogram. A frequent or long-term ECG analysis allows early diagnosis of e.g. a cardiac infarction. Nevertheless, patients often aren't willing to visit a doctor for prophylactic purposes. Possible solutions of this problem are home care devices, which are used to investigate patients at home without the presence of a doctor on site. As the diffusion of such systems leads to a huge amount of data which has to be managed and evaluated, the presented approach focuses on an easy to use software for ECG upload from home, a web based management application and an algorithm for ECG preanalysis and priorisation. © 2010 IEEE. Source

Ludwig A.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Schulz M.-L.,Keysight Technologies | Schindler P.,Infinera Corporation | Wolf S.,Karlsruhe Institute of Technology | And 3 more authors.
Optics Express | Year: 2015

A new modulation scheme with a sensitivity of 2.3 photons per bit at a bit-error ratio (BER) of 10-3 is discussed theoretically and demonstrated experimentally. We achieve a limiting sensitivity of 2.3 photons per bit (3.7 dB photons per bit) by stacking the modulation formats 64PPM, 4FSK and polarization-switched (PS) QPSK. This modulation stack encodes 11 bit per symbol (PPM: 6 bit, FSK: 2 bit, PS-PQSK: 3 bit). We also replaced 4FSK by 2ODFM (2-channel multiplex) for comparison. With 64PPM-2OFDM-PS-QPSK a total of 12 bit are encoded (PPM: 6 bit, 2 OFDM channels with PS-QPSK: 2 × 3 bit). Both modulation stacks show a similar limiting sensitivity and are probably the highest sensitivities so far reported for a BER of 10-3. Our theoretical considerations are supported by simulations and experiments. © 2015 Optical Society of America. Source

Pezzei P.,Institute of Microwave and Photonic Engineering | Wurster C.,Rosenberger OSI GmbH and Co. OHG | Wollitzer M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Fuchs M.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Leitgeb E.,Institute of Microwave and Photonic Engineering
International Conference on Transparent Optical Networks | Year: 2014

In this paper optical power distribution of free space optical propagation depending on the position of the receiving area is considered. A laser diode in continuous wave mode (cw-mode) defined by total optical emitted power and divergence angle was used for this study. The maximal observed distance between source and receiving area was 10 mm. In addition to the simulations of the received power depending on the receiver's position, measurements were also done for verification. Considerations concerning the power distribution of optical sources are inevitable for calculating link budgets. © 2014 IEEE. Source

Armbrecht G.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | Zietz C.,Leibniz University of Hanover | Denicke E.,Leibniz University of Hanover | Rolfes I.,Ruhr University Bochum
IEEE Transactions on Antennas and Propagation | Year: 2014

This paper concerns dielectric tube antenna design in the frequency range from 8.5 to 10.5 GHz for the use in the field of industrial radar level gauging for process automation industry. The application is based on monostatic radar configurations, which thus demands for highly directive endfire antennas made of chemically inert dielectrics, such as polytetrafluoroethylene (PTFE) or polypropylene (PP). Herein, the antennas consist of solid and tubular waveguides with cylindrical cross sections as well as transitions among these sections. In order to approach the promising theoretical directivity limits of thin-walled dielectric tubes at small aperture diameters, a fundamental HE11 mode-preserving waveguide transition forms the core element of the antenna. This yields compact dielectric antennas with directivity levels of around 20 dBi. By this means, a significant improvement in comparison to a circular metallic horn aperture of the same outer diameter as the radiating tube and a length reduction with regard to dielectric rod antennas is achieved. Finally, prototypes of the proposed antennas are manufactured and verified by measurements. © 2012 IEEE. Source

Pezzei P.,Institute of Microwave and Photonic Engineering | Hinteregger M.,Institute of Microwave and Photonic Engineering | Plank T.,Institute of Microwave and Photonic Engineering | Ludwig A.,Rosenberger Hochfrequenztechnik GmbH and Co. KG | And 4 more authors.
International Conference on Transparent Optical Networks | Year: 2015

In this contribution different types of transmitter misalignments are analysed with the ZEMAX and MATLAB software tools (including measurements) to show their influence on free space optical (FSO) links. The paper presents and defines a method to find the permissible lateral and angular transmitter misalignment of a unidirectional FSO link by changing different optical parameters. The analysis leads to an optimization of such link scenarios. The evaluated optical wireless link consists of a lens collimating the beam radiated by an optical source and another lens focusing the beam on a receiver area (detector). The received optical power is simulated in ZEMAX for different lateral and angular transmitter misalignments and additionally for various receiver area shifts out of the focal length of the lens at the detector site. Supplementary measurements are done to estimate the minimum received optical power (ROP) required for such misaligned FSO links under consideration of a given data rate of 10 Gb/s. Using MATLAB the simulated data are compared with the minimum ROP. The misalignment parameter value pair consisting of two entries is calculated, which describes succinctly the permissible lateral and angular transmitter misalignment of an optical wireless system. A configuration of a lens system for the transmitter and receiver of a unidirectional FSO link can be found by generating and comparing these pairs for various lens combinations. © 2015 IEEE. Source

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