A convenient delay, Doppler and angular-(DDA) domain representation of the multiple-input multiple-output (MIMO) wireless channel is conceived for deriving end to relationship in delay-Doppler (DD)-domain orthogonal time frequency space (OTFS)-based communications. Subsequently, a time-domain pilot based model developed estimating DDA-domain state information (CSI) our MIMO OTFS system. The key...

This paper investigates techniques for angular superresolution using limited data of real beam scanning radar (RBSR). In order to improve the angular resolution of RBSR, many algorithms have been proposed. However, for most algorithms, large amounts of sampling data is necessary. The requirement of data increases the burden of the radar system. Fortunately, the sparse signal reconstruction tech...

In an Orthogonal Frequency Division Multiplexing (OFDM) system, downlink beamforming can be implemented either before IDFT (frequency domain) or after IDFT (time domain) module in a base station transmitter. We denote the former scheme as PreIDFT downlink beamforming, and the latter as Post-IDFT downlink beamforming. In this work, we have compared Pre-IDFT downlink beamforming with Space-Time B...

Motion features play an important role in video retrieval. In this paper, we propose three new motion features that describe the local motion of arbitrarily shaped video objects. The proposed descriptors are based on the angular and circular area variances of the video object, the variances of the Angular Radial Transform coefficients of the object’s area, and the variances of the Fourier coeff...

We present a method to automatically decompose a light field into its intrinsic shading and albedo components. Contrary to previous work targeted to 2D single images and videos, a light field is a 4D structure that captures non-integrated incoming radiance over a discrete angular domain. This higher dimensionality of the problem renders previous state-of-the-art algorithms impractical either du...

The transient motion and the heat transfer of a viscous incompressible flow contained between two vertically eccentric spheres maintained at different temperatures and rotating about a common axis with different angular velocities is numerically considered when the angular velocities are an arbitrary functions of time. The resulting flow pattern, temperature distribution, and heat transfer char...

Let u 2 H be the exact solution of a given self{adjoint elliptic boundary value problem, which is approximated by some ~ u 2 S, S being a suitable nite element space. EEcient and reliable a posteriori estimates of the error j j u ? ~ u j j, measuring the (local) quality of ~ u, play a crucial role in termination criteria and in the adaptive reenement of the underlying mesh. A well{known class o...