in this paper some new applications of empirical mode decomposition (emd) and hilbert spectrum in seismic ground-roll attenuation, random noise attenuation and spectral decomposition are introduced. hilbert spectrum is a time-frequency representation for hilbert-huang transform which is obtained by combination of instantaneous frequency (if) concept and intrinsic mode function of empirical mode...

Time-division-duplexing massive multiple-input multiple-output (MIMO) systems estimate the channel state information (CSI) by leveraging uplink-downlink reciprocity, which is no longer valid when mismatch arises from asymmetric uplink and downlink radio frequency (RF) chains. Existing works treat reciprocity as constant for simplicity. However, practical RF chain consists of nonlinear component...

In frequency division duplexing systems, the base station (BS) acquires downlink channel state information (CSI) via feedback, which has not been adequately investigated in presence of RIS. this study, we examine limited feedback scheme by proposing a novel cascaded codebook and an adaptive bit partitioning strategy. The RIS segments between BS mobile into two sub-channels, each with line-of-si...

Consider a robust multiple-input single-output downlink beamforming optimization problem in frequency division duplexing system. The base station (BS) sends training signals to the users, and every user estimates channel coefficients, quantizes gain direction of estimated them back BS. Suppose that state information at transmitter is imperfectly known mainly due quantization errors, estimation ...

Objective(s): A novel IQ-SPECTTM method has become widely used in clinical studies. The present study compares the quality of myocardial perfusion images (MPI) acquired using the IQ-SPECTTM (IQ-mode),conventional (180° apart: C-mode) and L-mode (90° apart: L-mode) systems. We assessed spatial resolution, image reproducibility and quantifiability using various physical phantoms. Materials and Me...