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Main objective of this contribution is to apply Interference Alignment (IA) algorithms in real-world indoor environments for UWB MIMO MB-OFDM communication systems. In indoor environments, the required orthogonality between multiusers channels, which is necessary for proper IA, could be hardly reached. The spatial diversity among the users/nodes is mostly insufficient to obtain a robust performance...
This paper considers ultra-wideband (UWB) based localization of mobile users in indoor environment. Because of severe multipath indoor localization still presents a challenging issue and UWB is often considered as technology enabling precise localization. Typically for UWB Time of Flight (TOF) based approaches like Time of Arrival (TOA) or Time Difference of Arrival (TDOA) are applied. Recently also...
In this paper a positioning algorithm, based on the utilization of the receiving antenna properties is presented. The algorithm can be applied in Time of Flight (TOF) based localization systems with closely spaced receiving antennas additionally to the time estimation. In this work we present the practical measurements. But better result may be achieved using optimal receiving antennas and antenna...
In this paper we present a novel approach to cope with the mirroring problem for indoor localization. The suggested method is particularly suitable for Time-Difference-Of-Arrival (TDOA) based systems and can be implemented in locating systems with closely spaced receiving antennas (or base stations). Practical measurements are presented, showing the effectiveness of the algorithm in principle. The...
An open issue from a signal processing perspective is the adequate inclusion of real UWB antennas, and, in particular antenna array's, in an overall channel model for communication and localization purposes. The knowledge of several antenna properties, like polarization, directivity and phase patterns, and mutual coupling between neighbouring antennas - on both the transmit and receive side - are...
Aim of this contribution is to study the impact of typical ultra-wideband (UWB) antennas for communications over a spatial wireless channel. In order to adequately consider the directivity properties of real antennas, out analysis is suitably based on a ray tracing UWB channel model since this reflects the dependence on the angle of arrival (AoA) and angle of departure (AoD) of any multipath. A mathematical...
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