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ABSTRACT: Channel modelling today has to address time-variant systems with multiple antennas at the transmitter and at the receiver, the so-called MIMO (multiple input multiple output) systems. In order to describe this time-variant channel with spatially distributed antennas by a simple space-time filter, spatial system functions are defined, which are based on a space-time analogy of Bello's (1963) "physical-intuitive" systems functions. In addition, the paper in hand considers space-time correlation functions and introduces the corresponding space-time filter approach.
MIMO: Communications Systems from Concept to Implementations (Ref. No. 2001/175), IEE Seminar on; 01/2002
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ABSTRACT: IBMS is a concept for future mobile communication systems to provide a large range of data rates with different degrees of
mobility. The integration of heterogeneous services and communication systems requires a common Network Access and Connectivity
CHannel (NACCH) for basic signaling to provide permanent network access. Smart Antennas are utilized to adaptively enable
a trade-off between mobility and data rate.
12/2001: pages 35-48;
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ABSTRACT: Appropriate channel models are needed in order to determine the performance of new emerging space time processing techniques. This paper investigates several properties of the mobile space-time channel, which can be modeled by stochastic parameters of the time-variant azimuth-delay-power-spectrum (ADPS). The raw characteristics of the ADPS are determined from ray tracing methods using the Radiowave Propagation Simulator (RPS). A simple mobility model has been integrated into the simulation tool, which assumes a mobile user moving with constant velocity along specified corridors within the selected scenarios.
10/2001;
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ABSTRACT: The simulation of space-time receivers for wireless communication
systems requires a spatial channel model which reasonably characterizes
the time-variant effects of the mobile radio channel. This paper
describes a space-time vector channel model with stochastic fading
simulation and its effective implementation for bit-level simulations.
Measurements have been analyzed in order to verify the assumptions of
the channel model
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th; 02/1999
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ABSTRACT: In the recent years, the field of mobile communication has been vastly growing due to the introduction of new detection techniques. The latest innovation is the use of smart antennas in order to increase the capacity of mobile communication systems. As an impact of this new technology, the modem design has to be reviewed. New requirements of design criteria are formulated. The need for new channel models, that are dependent on the direction of arrival (DoA), is pointed out. Only a comprehensive view of the total modem including the smart antennas guarantees the development of effective algorithms for channel estimation in time and space, equalization, detection etc. Smart antennas have an inherent capability to increase the capacity of a mobile communication system, but not only to serve more users and to cover a larger region, but also to increase the data rate. This new aspect has been investigated both theoretically and by measurements. It is especially important in future mobile communication systems since there is an emerging demand for higher data rates.
Wissenschaftliche Zeitschrift der Technischen Universität Dresden. 01/1998;
