A novel beamforming (BF) system that employs two switched beam antennas (SBAs) at both ends of the wireless link in an indoor double-directional radio channel (DDRC) is proposed. The distributed directivity gain (DDG) and beam pattern correlation in DDRC are calculated. The channel capacity of the BF system is obtained from an analytical model. Using the channel capacity and outage capacity as ...

Free-space optical communication is emerging as a low-power, low-cost, and high data rate alternative to radio-frequency in short- medium-range applications. However, it requires close-to-line-of-sight link between the transmitter receiver. This paper proposes robust H∞ control law for free-space (FSO) beam pointing error systems under controlled weak turbulence conditions. The objective mainta...

In this paper, we consider the problem of joint beam selection and link activation across a set communication pairs to effectively control interference between via inactivating part in ultra-dense device-to-device (D2D) mmWave networks. The resulting optimization is formulated as an integer programming that nonconvex NP-hard. Consequently, global optimal solution, even local cannot be generally...

In this paper, a comprehensive study is presented on the effect of beam's length, shear deformation and beam's theory on the dynamic modeling of single-link flexible manipulator. At the first step, Euler-Bernoulli beams theory (EBBT) is adopted. According to this model the effect of shear deformation is neglected. So, this model is only reliable for the case of slender beam. When the beam is sh...

Flexible-link manipulators have high demand in many industrial and space applications. This is simply because they have many advantages over the rigid manipulators such as light weight, fast response time and large payload capacity. Optimal trajectories for a two-link rigid-flexible manipulator based on trajectory tracking and obstacle avoidance criteria are designed using Generalized Pattern S...

In this paper, we present physical layer and system level techniques that can increase the capacity of a multi-beam high throughput satellite (HTS) communication system. These include advanced predistortion and equalization techniques for the forward link, synchronization and non-linear distortion minimization techniques for the return link waveforms. Interference management techniques such as ...

This paper deals with the modeling and control of a special class of single-link flexible arms. These arms consist of flexible massless structures having some masses concentrated at certain points of the beam. In this paper, the dynamic model of such flexible arms is dewloped and some of the control properties are deduced. A robust control scheme to remove the effects of friction in the joins i...

The beam-wander contribution to the scintillation in a ground-to-satellite free-space optical link is one of major importance. An analytical model, based on the duality between beam wander and angle-of-arrival fluctuations, is proposed for the temporal statistics. The expression of the probability density function of the log-amplitude fluctuations is first obtained. Then, the expressions of the...