Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.
2009Capacity measurements in a cooperative MIMO network
Jungnickel, V.; Jäckel, S.; Thiele, L.; Lei, J.; Kruger, U.; Brylka, A.; Helmolt, C. von
Journal Article
2008Flexible demonstrator platform for cooperative joint transmission and detection in next generation wireless MIMO-OFDM networks
Ibing, A.; Kühling, D.; Kuszak, M.; Helmolt, C. von; Jungnickel, V.
Conference Paper
2007Dynamisches datenratenadaptives Signalverarbeitungsverfahren in einem drahtlosen Infarot-Datenübertragungssystem
Grubor, J.; Jungnickel, V.; Langer, K.-D.; Helmolt, C. von
Patent
2007Mobile access techniques for data rates up to gigabit/s
Jungnickel, V.; Helmolt, C. von
Conference Paper
20051 Gbit/s MIMO-OFDM transmission experiments
Jungnickel, V.; Forck, A.; Haustein, T.; Schiffermüller, S.; Helmolt, C. von; Luhn, F.; Pollock, M.; Juchems, C.; Lampe, M.; Zirwas, W.; Eichinger, J.; Schulz, E.
Conference Paper
2005The algebraic structure of frequency-selective MIMO channels
Pohl, V.; Jungnickel, V.; Helmolt, C. von
Journal Article
2005Continuous flat-fading MIMO channels
Pohl, V.; Nguyen, P.H.; Jungnickel, V.; Helmolt, C. von
Journal Article
2005FUNKUEBERTRAGUNGSVERFAHREN IM INNENRAUMBEREICH ZUR PARALLELEN FUNKUEBERTRAGUNG VON DIGITALEN DATENTEILSTROEMEN UND MOBILES FUNKUEBERTRAGUNGSSYSTEM
Jungnickel, V.; Krueger, U.; Pohl, V.; Helmolt, C. von; Haustein, T.; Stanczak, S.
Patent
2005On the value of spatial diversity for the synchronisation in MIMO-OFDM systems
Schellmann, M.; Jungnickel, V.; Helmolt, C. von
Conference Paper
2004Implementation of adaptive channel inversion in a real-time MIMO transmission system
Haustein, T.; Forck, A.; Gäbler, H.; Helmolt, C. von; Jungnickel, V.; Krüger, U.
Conference Paper
2004Implementation of channel aware scheduling and bit-loading for the multiuser SIMO MAC in a real-time MIMO demonstration test-bed at high data rate
Haustein, T.; Zhou, C.; Forck, A.; Gäbler, H.; Helmolt, C. von; Jungnickel, V.; Krüger, U.
Conference Paper
2004A MIMO system with reciprocal transceivers for the time-division duplex mode
Jungnickel, V.; Krüger, U.; Istoc, G.; Haustein, T.; Helmolt, C. von
Conference Paper
2004A multi-code space-frequency RAKE receiver
Chen, H.; Jungnickel, V.; Pohl, V.; Helmolt, C. von
Conference Paper
2004Optimal length of the training and data phase in continuous flat fading MIMO channels
Pohl, V.; Jungnickel, V.; Helmolt, C. von
Conference Paper
2004Real-time concepts for MIMO-OFDM
Jungnickel, V.; Haustein, T.; Forck, A.; Schiffermueller, S.; Gäbler, H.; Helmolt, C. von; Zirwas, W.; Eichinger, J.; Schulz, E.
Conference Paper
2004Real-time MIMO transmission with adaptive bitloading
Haustein, T.; Forck, A.; Gäbler, H.; Helmolt, C. von; Jungnickel, V.; Krüger, U.
Conference Paper
2003Capacity of MIMO systems with closely spaced antennas
Jungnickel, V.; Pohl, V.; Helmolt, C. von
Journal Article
2003The effect of path loss variations on the capacity of MIMO systems
Pohl, V.; Jungnickel, V.; Haustein, T.; Helmolt, C. von
Conference Paper
2003Electronic tracking for wireless infrared communications
Jungnickel, V.; Forck, A.; Haustein, T.; Krüger, U.; Pohl, V.; Helmolt, C. von
Journal Article
2003Experiments on the element spacing in multi-antenna systems
Jungnickel, V.; Pohl, V.; Helmolt, C. von
Conference Paper
2003How often channel estimation is needed in MIMO systems
Pohl, V.; Nguyen, P.H.; Jungnickel, V.; Helmolt, C. von
Conference Paper
2003Limits of the achievable symbol rate in flat fading MIMO systems
Pohl, V.; Nguyen, P.H.; Jungnickel, V.; Helmolt, C. von
Conference Paper
2003Link adaptation in a multi-antenna system
Jungnickel, V.; Haustein, T.; Pohl, V.; Helmolt, C. von
Conference Paper
2002Antenna spacing in MIMO indoor channels
Pohl, V.; Jungnickel, V.; Haustein, T.; Helmolt, C. von
Conference Paper
2002On linear pre-processing in multi-antenna systems
Jungnickel, V.; Haustein, T.; Jorswieck, E.; Helmolt, C. von
Conference Paper
2002On the performance of signal detection algorithms in flat-fading and frequency-selective MIMO channels
Jorswieck, E.; Jungnickel, V.; Haustein, T.; Pohl, V.; Helmolt, C. von
Conference Paper
2002Performance of MIMO systems with channel inversion
Haustein, T.; Helmolt, C. von; Jorswieck, E.; Jungnickel, V.; Pohl, V.
Conference Paper
2002A physical model of the wireless infrared communication channel
Jungnickel, V.; Pohl, V.; Nonnig, S.; Helmolt, C. von
Journal Article
2002Zero forcing equalizing filter for MIMO channels with intersymbol interference
Pohl, V.; Jungnickel, V.; Jorswieck, E.; Helmolt, C. von
Conference Paper
2001155 Mbit/s wireless transmission with imaging infrared receiver
Jungnickel, V.; Haustein, T.; Forck, A.; Helmolt, C. von
Journal Article
2001Bit error rates for a MIMO system in Rayleigh and Rician channels
Haustein, T.; Jorswieck, E.; Jungnickel, V.; Krueger, U.; Pohl, V.; Helmolt, C. von
Conference Paper
2001A MIMO WLAN based on linear channel inversion
Jungnickel, V.; Haustein, T.; Jorswieck, E.; Helmolt, C. von
Conference Paper
2001Performance of a MIMO system with overlay pilots
Jungnickel, V.; Haustein, T.; Jorswieck, E.; Pohl, V.; Helmolt, C. von
Conference Paper
2001A power and bandwidth efficient modulation for diffuse wireless infrared communication
Kruger, U.; Helmolt, C. von; Jungnickel, V.; Haustein, T.
Journal Article
2001A radio system with multi-element antennas
Pohl, V.; Kruger, U.; Helmolt, C. von; Haustein, T.; Stanczak, S.
Conference Paper
2000A channel model for wireless infrared communication
Pohl, V.; Jungnickel, V.; Helmolt, C. von
Conference Paper
2000Integrating-sphere diffuser for wireless infrared communication
Pohl, V.; Jungnickel, V.; Helmolt, C. von
Journal Article
1999Fast word synchronisation for digital pulse-position modulation
Jungnickel, V.; Can, A.; Helmolt, C. von
Journal Article
1999Integrating sphere diffuser for wireless infrared communication
Pohl, V.; Jungnickel, V.; Hentges, R.; Helmolt, C. von
Conference Paper
1999OPTISCHER FREQUENZGENERATOR
Helmolt, C. von; Krueger, U.
Patent
1998Broadband wireless infrared LAN architecture compatible with Ethernet protocol
Jungnickel, V.; Helmolt, C. von; Kruger, U.
Journal Article
1998Optical microwave generation and transmission experiments in the 12- and 60-GHz region for wireless communications
Braun, R.-P.; Grosskopf, G.; Heidrich, H.; Helmolt, C. von; Kaiser, R.; Kruger, K.; Kruger, U.; Rohde, D.; Schmidt, F.; Stenzel, R.; Trommer, D.
Journal Article
1997Comparison of the cascadability performance of different types of commercially available wavelength (de)multiplexers
Caspar, C.; Foisel, H.-M.; Helmolt, C. von; Strebel, B.; Sugaya, Y.
Conference Paper
1997Microwave fiber-optic downconverter
Helmolt, C. von; Kruger, U.; Kruger, K.
Conference Paper
1997Quasicontinuous tunable fiber-ring laser applied as local oscillator in an absolute calibrated spectrometer for WDM systems
Kruger, U.; Kruger, K.; Helmolt, C. von
Journal Article
199658 GHz fibre optic upconverter
Helmolt, C. von; Kruger, U.; Kruger, K.; Kuller, L.
Journal Article
1996Absorption spectra of excited Kr 84 states between 1.5 and 1.58 mu m and their use for absolute frequency locking
Fischer, U.H.P.; Helmolt, C. von
Journal Article
1996Decentralized frequency stabilization scheme for a dense OFDM system involving simple filters and an absolute reference
Kruger, U.; Kruger, K.; Helmolt, C. von; Pawlowski, E.; Depovere, G.F.G.; Witlox, R.G.J.J.; Gils, R.A.J.C.M. van
Journal Article
1996Optical microwave generation and transmission experiments in the 12 and 60 GHz-region for wireless communications
Braun, R.P.; Grosskopf, G.; Helmolt, C. von; Kruger, K.; Kruger, U.; Rohde, D.; Schmidt, F.
Conference Paper
1996Special tunable fiber-ring laser, applied as local oscillator in an absolute calibrated spectrometer for WDM systems
Kruger, U.; Kruger, K.; Helmolt, C. von
Conference Paper
1995Long-term frequency stability of three absolutely referenced lasers at 1547.8 nm located at different places which were separated by 30 Km
Fischer, U.H.P.; Gladisch, A.; Giehmann, L.; Helmolt, C. von; Rocks, M.
Conference Paper
1995Saturation and isotopic shift of the Kr 84 excited-state transition at 1547.825 nm
Fischer, U.H.P.; Helmolt, C. von
Journal Article
1994Engineered automatic control and frequency stabilization unit for a coherent multichannel (CMC) system
Fischer, U.H.P.; Helmolt, C. von; Kruger, K.; Kruger, U.
Journal Article
1994Engineered, rack-mounted, optical reference unit at 1547.825 nm
Fischer, U.H.P.; Helmolt, C. von
Journal Article
1994Scanning heterodyne spectrometer with different local oscillator laser types
Fischer, U.H.P.; Helmolt, C. von
Journal Article
1994Wavelength manager covering the EDFA-band and capable of controlling hundreds of transmitters
Kruger, U.; Kruger, K.; Batchellor, C.R.; Fischer, U.; Helmolt, C. von; Nagengast, U.
Conference Paper
1993Optical frequency multiplex technique: principles, applications, and potential
Bachus, E.-J.; Grosskopf, G.; Heidrich, H.; Helmolt, C. von; Meissner, P.; Patzak, E.; Saniter, J.; Strebel, B.; Walf, G.; Weber, H.-G.
Journal Article
1993Polarisation insensitive frequency conversion of a 10-channel OFDM signal over 275 GHz in a semiconductor laser amplifier
Schnabel, R.; Hilbk, U.; Hermes, T.; Meissner, P.; Helmolt, C. von; Magari, K.; Raub, F.; Pieper, W.; Westphal, F.J.; Ludwig, R.; Kuller, L.; Weber, H.G.
Conference Paper
1992Absolute CMC frequency stabilisation with 0.8 THz control range and OEIC front-end module
Fischer, U.H.P.; Helmolt, C. von; Kruger, K.; Kruger, U.
Journal Article
1991Engineered automatic control and frequency stabilization unit for the RACE project R 1010: Coherent multichannel (CMC) system demonstrator
Fischer, U.H.P.; Helmolt, C. von; Kruger, K.; Kruger, U.
Conference Paper
1989Reflection suppression by orthogonal modes
Helmolt, C. von
Journal Article
1987Efficiency of guided wave acoustooptic interaction for selected cuts in LiNbO3
Helmolt, C. von; Schaffer, C.H.
Journal Article
1987Integrated optic strip waveguide phase modulator driven by a SAW
Helmolt, C. von
Journal Article
1987Polarisation transformer on Ti:LiNbO3 with reset-free optical operation for heterodyne/homodyne receivers
Heidrich, H.; Helmolt, C. von; Hoffmann, D.; Hensel, H.-J.; Kleinwachter, A.
Journal Article
1987Stable operation of a laser diode directly coupled to a LiNbO3 chip using optical isolation by orthogonal polarization
Helmolt, C. von; Heidrich, H.; Schunk, N.
Journal Article
1986Broadband single-mode Te/TM convertors in LiNBO3: a novel design
Helmolt, C. von
Journal Article