Spatial transmission mode switching in multiuser MIMO-OFDM systems with user fairness (2010)
Schellmann, M., Thiele, L., Haustein, T., Jungnickel, V.
Multiantenna radio systems allow accessing the channel in diversity or spatial multiplexing (SMUX) mode. Adequate switching between thesemodes according to current channel conditions was shown to...
T. Haustein, A. Forck, H. Gäbler, V. Jungnickel, S. Schiffermüller
In this paper we focus on channel adaptive transmission in the multi-user OFDM Uplink where the base station uses multiple antennas. The additional degree of freedom in space requires extra signal...
Interference-aware scheduling in the multiuser MIMO-OFDM downlink (2009)
Jungnickel, V., Schellmann, M., Thiele, L., Wirth, T., Haustein, T., Koch, O., ...
With the introduction of orthogonal frequency- division multiplexing and multiple antennas in cellular networks, there are new opportunities to adapt the transmission to propagation and interference...
Wu, H.G., Haustein, T., Hoeher, P.A.
This paper compares the information rate achieved by SC-FDMA (single-carrier frequency-division multiple access) and OFDMA (orthogonal frequency-division multiple access), where a linear...
INVERSE EIGENVALUE STATISTICS FOR RAYLEIGH AND RICIAN MIMO CHANNELS (2008)
E. Jorswieck, G. Wunder, V. Jungnickel, T. Haustein
Recently reclaimed importance of the empirical distribution function of the eigenvalues of Wishart matrices was attached to the analysis of MIMO systems in [1]. But for the analysis of MIMO systems...
PHY 51-3 - Realtime multi-user multi-antenna downlink measurements (2008)
Wirth, T., Jungnickel, V., Forck, A., Wahls, S., Gäbler, H., Haustein, T., ...
In this paper, we present real-time broadband multi-user multi-antenna measurements in typical indoor and outdoor scenarios. For the first time, essential frequency-selective functions of a new...
Synchronization of cooperative base stations (2008)
Jungnickel, V., Wirth, T., Schellmann, M., Haustein, T., Zirwas, W.
We consider synchronization techniques required to enhance the cellular network capacity using base station cooperation. In the physical layer, local oscillators are disciplined by the global...
Feedback design for multi-user MIMO systems (2008)
Jungnickel, V., Thiele, L., Wirth, T., Schellmann, M., Haustein, T., Venkatkumar, V.
The authors consider feedback design for the integration of multi-user multiple input multiple output (MIMO) in cellular mobile radio systems. Feedback is given by the mobile terminals, which report...
Implementation concepts for distributed cooperative transmission (2008)
Jungnickel, V., Thiele, L., Schellmann, M., Wirth, T., Forck, A., Zirwas, W., ...
Information theory predicts huge performance gains in terms of spectrum efficiency by using cooperative transmission from multiple base stations. Cooperation eliminates inter-cell interference and it...
Halfmann, R., Haustein, T., Ibing, A., Zirwas, W.
WO 2009090233 A1 UPAB: 20090806 NOVELTY - The routing node (102) has a node receiving apparatus arranged such that the apparatus can be used to receive signals from a terminal device (103) e.g....
Verfahren und Vorrichtung zur Datenuebertragung (2008)
Zirwas, W., Eichinger, J.-M., Ibing, A., Thiele, L., Jungnickel, V., Haustein, T.
DE 102008007497 A1 UPAB: 20090826 NOVELTY - The method involves transferring data of the data source from a network knot working as a relay station to a data sink. The data is transferred on a...
Verfahren zum Steuern einer Relaisstation in einem Mobilfunknetzwerk (2008)
Ibing, A., Zirwas, W., Haustein, T., Halfmann, R.
DE 102008009087 A1 UPAB: 20090928 NOVELTY - The method involves receiving bandwidth requirements from terminals (150,160,170) by a broadcasting station (140). An aggregated bandwidth requirement is...
Vorrichtung zum Zuweisen und Schaetzen von Uebertragungssymbolen (2008)
Jaeckel, S., Jungnickel, V., Schierl, T., Hellge, C., Haustein, T.
WO 2009153068 A2 UPAB: 20100107 NOVELTY - The transmitter has a device to assign transmission symbols to information symbols of a partial stream, where the symbols are processed in a data processing...
Jungnickel, V., Jorswieck, E., Haustein, T., Helmolt, C.v.
WO2004047354 A UPAB: 20040624 NOVELTY - The channel matrix H is determined in terms of the reception- (y), transmission- (x) and noise (n) vectors, from y = Hx + n. Singularities are analyzed in...
Maximization of the single user rate in OFDMA assuming equal power on allocated subcarriers (2007)
Giovanidis, A., Haustein, T., Jorswieck, E., Donghee, K.
The problem of optimal power allocation for a single user in an OFDMA system is considered for uplink, under the assumption that the total power is divided equally to a selected subset of...
Haustein, T., Eichinger, J., Zirwas, W., Schulz, E., Forck, A., Gäbler, H., ...
In this paper the authors report on the system design and a real-time implementation of a MIMO-OFDM radio transmission system close to physical layer parameters as discussed in standardization for...
Haustein, T., Forck, A., Gäbler, H., Jungnickel, V., Schiffermüller, S.
A recently realized concept of a reconfigurable hardware test-bed suitable for real-time mobile communication with multiple antennas is presented in this paper. The reasons and prerequisites for...
Gigabit mobile communications using real-time MIMO-OFDM signal processing (2006)
Jungnickel, V., Forck, A., Haustein, T., Juchems, C., Zirwas, W.
Multiuser scheduling using equal power in allocated subcarriers for OFDM uplink (2006)
Giovanidis, A., Haustein, T., Hadisusanto, Y, Sezgin, A., Kim, D.
In this paper the problem of optimal subcarrier and power allocation for sum rate maximization in the uplink of an OFDMA system is considered, under the assumption that each user allocates equal...
Haustein, T., Forck, A., Gabler, H., Schiffermueller, S.
In this paper we investigate the achievable practical throughput with channel aware bit-loading in experiments on a real-time MIMO test-bed. We compare three prominent MIMO transmission schemes, two...
Haustein, T., Wiczanowski, M., Boche, H., Schulz, E.
We present a multi-antenna real-time implementation of a cross-layer uplink scheduler based on a recently developed framework. We outline the theory behind the stability-optimal scheduler, which...
1 Gbit/s MIMO-OFDM transmission experiments (2005)
Jungnickel, V., Forck, A., Haustein, T., Schiffermüller, S., Helmolt, C. Von, Luhn, F., ...
V. Jungnickel, T. Haustein, A. Forck, U. Krueger, V. Pohl, C. Von Helmolt
Over-the-air transmission experiments with a realtime MIMO test-bed are reported. We describe in principle a hardware architecture for spatial multiplexing at high data rates, discuss in detail the...
Haustein, T., Zhou, C., Forck, A., Gäbler, H., Helmolt, C. Von, Jungnickel, V., ...
In this paper we discuss a cross layer approach to apply channel aware scheduling for a multi user SIMO multiple access channel. We show how optimum power and rate allocation can be achieved when...
Implementation of adaptive channel inversion in a real-time MIMO transmission system (2004)
Haustein, T., Forck, A., Gäbler, H., Helmolt, C. Von, Jungnickel, V., Krüger, U.
The implementation of adaptive channel inversion into a real-time single carrier MIMO test-bed is reported for the first time. Since no joint detection is possible at the distributed users all signal...
Rea-time MIMO transmission with adaptive bitloading (2004)
Haustein, T., Forck, A., Gäbler, H., Helmolt, C. Von, Jungnickel, V., Krüger, U.
The Implementation of channel-aware rate control into a real-time single carrier MIMO test-bed is reported. The implemented algorithms are described and measurement results show throughput gains up...
Real-time concepts for MIMO-OFDM (2004)
Jungnickel, V., Haustein, T., Forck, A., Schiffermueller, S., Gäbler, H., Helmolt, C. Von, ...
We present a concept for implementing a real-time MIMO-OFDM system on a hybrid FPGA/DSP software-radio platform. The basic system parameters are chosen similar to the HiperLAN/2 standard using a...
A MIMO system with reciprocal transceivers for the time-division duplex mode (2004)
Jungnickel, V., Krüger, U., Istoc, G., Haustein, T., Helmolt, C. Von
For the application of advanced smart antenna and MIMO techniques as joint transmission, channel inversion and Tomlinson-Harashima pre-coding in future radio systems, channel side information is...
In this paper we propose a special antenna design for indoor applications which enables superior transmission properties within a designated and fixed area due to a line of sight (LOS) based MIMO...
The effect of path loss variations on the capacity of MIMO systems (2003)
Pohl, V., Jungnickel, V., Haustein, T., Helmolt, C. Von
Flat fading MIMO channels are often modelled by a transfer matrix with independent but identically distributed (i.i.d.) complex random numbers. Measurements indicate that the assumption of an...
Link adaptation in a multi-antenna system (2003)
Jungnickel, V., Haustein, T., Pohl, V., Helmolt, C. Von
We investigate a simple link adaptation scheme for a multi-antenna system based on adaptive channel inversion. A step-wise trade-off between spatial multiplexing and diversity is used to keep the...
Channel aware scheduling for multiple antenna multiple access channels (2003)
Boche, H., Jorswieck, E.A., Haustein, T.
In this paper, we study the optimum transmission strategy of the multiple access channel in a cellular system in which the base station has multiple antennas. Recently, scheduling algorithms...
Electronic tracking for wireless infrared communications (2003)
Jungnickel, V., Forck, A., Haustein, T., Krüger, U., Pohl, V., Helmolt, C. Von
A high-speed wireless system (>or=100 Mb/s) for indoor infrared (IR) communications via the line of sight is described and feasibility is shown in an experimental demonstrator. A diffuse link is...
Antenna spacing in MIMO indoor channels (2002)
Pohl, V., Jungnickel, V., Haustein, T., Helmolt, C. Von
We study the relation between antenna spacing and capacity of MIMO channels for indoor environments using a ray tracing program. It has been confirmed also by measurements that in rich scattering...
Jorswieck, E., Jungnickel, V., Haustein, T., Pohl, V., Helmolt, C. Von
In this work, we study a single-user MIMO transmission link in flat and frequency selective Rayleigh fading. The impact of the time dispersion in the channel on the performance of the signal...
Performance of MIMO systems with channel inversion (2002)
Haustein, T., Helmolt, C. Von, Jorswieck, E., Jungnickel, V., Pohl, V.
The paper discusses channel inversion which is a spatial equalization technique when channel state information is available at the transmitter. Channel inversion is a straightforward concept without...
A MIMO WLAN based on linear channel inversion (2001)
Jungnickel, V., Haustein, T., Jorswieck, E., Helmolt, C. Von
Multiple-input multiple-output (MIMO) techniques may increase the capacity of wireless local area networks (WLAN) since they profit from rich scattering of radio waves in indoor environments. On the...
Inverse eigenvalue statistics for Rayleigh and Rician MIMO channels (2001)
Jorswieck, E., Wunder, G., Jungnickel, V., Haustein, T.
Recently reclaimed importance of the empirical distribution function of the eigenvalues of Wishart matrices was attached to the analysis of MIMO systems in Hochwald et al. (2001). But for the...
Performance of a MIMO system with overlay pilots (2001)
Jungnickel, V., Haustein, T., Jorswieck, E., Pohl, V., Helmolt, C. Von
A multiple-input multiple-output (MIMO) indoor radio system is studied to identify the origin of a typical performance degradation. When the data and overlay pilot-sequences for the channel...
Bit error rates for a MIMO system in Rayleigh and Rician channels (2001)
Haustein, T., Jorswieck, E., Jungnickel, V., Krueger, U., Pohl, V., Helmolt, C. Von
Multiple input multiple output (MIMO) systems, being under intensive research nowadays, are discussed under the aspect of bit error rates (BER) that can be achieved in indoor scenarios. This paper...
A radio system with multi-element antennas (2001)
Pohl, V., Kruger, U., Helmolt, C. Von, Haustein, T., Stanczak, S.
A radio hardware concept for indoor WLAN applications is described in which both the transmitter and the receiver use multi-element antennas. The system exploits the increased capacity of the...
A power and bandwidth efficient modulation for diffuse wireless infrared communication (2001)
Kruger, U., Helmolt, C. Von, Jungnickel, V., Haustein, T.
A new coding scheme for wireless diffuse infrared links is proposed, allowing simultaneously improvements in power and bandwidth efficiency. It gives the freedom to design diffuse systems overcoming...
155 Mbit/s wireless transmission with imaging infrared receiver (2001)
Jungnickel, V., Haustein, T., Forck, A., Helmolt, C. Von
155 Mbit/s wireless transmission over a distance of nearly 2 m is demonstrated for the first time with electronic position detection and tracking of the transmitter at an imaging infrared receiver....