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In this paper, we propose a computationally simple and efficient subspace-based adaptive method for estimating directions-of-arrival (AMEND) for multiple coherent narrowband signals impinging on a uniform linear array (ULA), where the previously proposed QR-based method is modified for the number determination, a new recursive least-squares (RLS) algorithm is proposed for null space updating, and...
In this paper, a special design of Uniform Concentric Circular Array (UCCA) is proposed to improve directions of arrival (DoAs) estimation accuracy in fully correlated sources situation. The Centro-symmetry propriety of the introduced antennas shape, as well as each of its subarrays, allow us to develop a Modified Forward/Backward Spatial Smoothing technique (MFBSS) to remove signals' coherence. The...
The estimation of the position of an emitting source is an important aspect of emerging cognitive radio systems. We readdress the known problem of estimating the Direction-of-Arrival (DOA) of an emitting source via passive radio means, namely an antenna array. The challenges in the considered scenarios are (a) time-varying, terrestrial multipath propagation with medium-to-low SNR and (b) very short...
In this paper, a simple transmit beamforming scheme over MISO channel in two-way relay networks is proposed. Beam in the proposed scheme is built to maximize sum of the receive power of the two receivers according to their geographic location. The key consideration is to estimate signal direction of arrival (DOA) with the location information supported by localization and tracking instead of using...
This paper addresses a fast algorithm for joint estimation of the two-dimensional (2-D) angles and polarization of the impinging signals based on a novel hierarchical spacetime decomposition (HSTD) technique. The proposed algorithm makes use of a sequence of one-dimensional (1-D) Estimation of Signal Parameters via Rotational Invariance Techniques (ESPRIT) algorithms to estimate these parameters alternatively...
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...
In this paper we investigate the impact of fading correlation at the receiving elements of a compact antenna array in a relay assisted cooperative scheme in single-input multiple-output (SIMO) configuration with one or multiple relays operating in amplify-and-forward mode. We assume that the source and the relay terminals are each equipped with one antenna, while the destination terminal is equipped...
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