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Heart rate (HR) monitoring is necessary for daily healthcare. Wrist-type photoplethsmography (PPG) is a convenient and non-invasive technique for HR monitoring. However, motion artifacts (MA) caused by subjects' movements can extremely interfere the results of HR monitoring. In this paper, we propose a high accuracy method using motion decision, singular spectrum analysis (SSA) and spectral peak searching...
Robust adaptive beamforming algorithms with fully automatic diagonal level computation are desired but scarce in the literature. We note that the an imaginary-valued diagonal loading level well approximates but differs from its real-valued counterpart in terms of output signal-to-interference-plus-noise ratio (SINR), and an estimate of the optimal diagonal loading level can be found by the highest...
This paper proposes an extension of the NOncircularity Rate Maximization (NORM) beamformer that takes into account noncircular interferences. The main idea of the new approach is to utilize the spatial diversity and noncircularity dissimilarity between the desired signal and interferences plus noise simultaneously. For this purpose, the weight vector is designed by maximizing the non-circularity rate...
A parallel factor analysis (PARAFAC) based beamformer using a polarization sensitive array of co-centered orthogonal loop and dipole (COLD) vector antennas is proposed for near-field or far-field source signals. While joint suppression of the interferences in the direction, polarization, and range domains is achieved, the beamformer needs only one of the following source knowledge (maybe inaccurate)...
Adaptive beamforming using a crossed-dipole array is addressed in the hypercomplex framework. A new variant of Capon beamformer, called Quaternion-Capon (Q-Capon) beamformer, is herein proposed to fulfill the linearly constrained minimization operation in the quaternion domain. Simulation results show that the Q-Capon beamformer has a better convergence performance than the standard "long-vector"...
Automatic beamforming for noncircular signals with distinct noncircularity-rates can be achieved via Takagi factorization based on the second-order statistics. However, the requirement on noncircularity-rate diversity can not be satisfied by rectilinear signals (e.g., AM and BPSK signals), which are used in many practical communications systems. A mixed-order Takagi factorization scheme is herein...
A new adaptive beamforming scheme via noncircularity-rate maximization (NORM) is presented for blind recovery of a narrowband signal with nonzero noncircularity degree (such as AM, ASK and BPSK signals). By maximizing the noncircularity rate of the output signal, this new second-order blind beamformer can directly extract the signal of interest from circular interferences and noise (both are not necessarily...
In this paper we study an accurate interference rejection capability of a minimum-variance polarization sensitive (MVPS) beamformer using a uniform linear array of crossed dipoles. The interference cancellation is done in the spatio-polarized domain since MVPS beamformer search in both the direction of arrival and polarization domains. Also, MVPS beam-former has the capability of handling more signals...
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