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In this paper a novel solution for coherent combination in ultra wide band (UWB) beamformings for real time locating systems (RTLS) is proposed. The architecture uses a double quadrature receiver and the time alignment is approached by digital phase-shifters. A comparison and evaluation with classical True Time delay (TTD) architectures is presented. Our proposed architecture achieves same performances...
This paper describes the implementation of a Digital Signal Processing (DP) subsystem for a single Long Wavelength Array (LWA) station. The LWA is a radio telescope that will consist of many phased array stations. Each LWA station consists of 256 pairs of dipole-like antennas operating over the 10-88 MHz frequency range. The Digital Signal Processing subsystem digitizes up to 260 dual-polarization...
A dynamic resource allocation algorithm with beam steering is evaluated for providing broadband wireless access to mobile users of the emerging IEEE 802.16 m air interface standard. Thanks to our design, the coverage area and total throughput may be significantly enhanced, compared to the current IEEE 802.16 e standard. Our proposed solution supports high mobility, improves fairness among the users...
In this paper, we propose a communications receiver architecture composed of a time-reversal approach to simplify the shallow underwater acoustic channel and to suppress multiuser interference followed by an iterative, successive interference cancellation (SIC) scheme to cancel the remaining interference. The SIC process is the multiuser interference equivalent of the decision-directed, feedback equalizer...
This paper addresses the problem of direct-path passive broadband localization of a shallow-water acoustic source with a sparsely distributed set of sensors in the presence of uncertain multipath propagation. The classical approach to broadband source localization with sensors spaced many wavelengths apart involves time delay estimation (TDE) via generalized cross-correlation (GCC) methods. In shallow-water...
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