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Ultra-wideband impulse radio (UWB-IR) exhibits good immunity to the multipath in dense cluttered environments because of its high temporal resolution. However, UWB-IR source direction finding is more challenging due to the frequency-selective distortion. Furthermore, the multipath interferences in both far-field and near-field regions affect the direct path resolution. This paper presents a robust...
Indoor environments are typically complex wireless propagation channels with numerous multi-paths created by closely spaced scattering objects. The ability to resolve these multi-paths is very important for good ranging resolution and positioning accuracy. Impulse-Radio Ultra-Wideband (IR-UWB) is a promising technology to fulfill these usage requirements in indoor cluttered environment. A portable...
Antenna array is useful in direction-finding because of its spatial-spread signal profile. Conventional array processing for narrowband is not suitable for ultra-wideband impulse radio (UWB-IR) because of the wideband spectrum and large off signal period. This paper addresses the utility of uniform circular array for AOA estimation in a line-of-sight (LOS) UWB-IR channel. Maximum likelihood (ML) estimation...
An uniform circular array (UCA) structure with four-element antennas is proposed to perform Angle-Of-Arrival (AOA) estimation at the receiver in IR-UWB indoor positioning system. A novel algorithm named Common-Rhythm Detection is proposed to estimate Time difference of arrival (TDOA). The performances of TDOA estimation algorithms have been compared based on UCA receiver. The accuracy of estimated...
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