The problem of controllability and control linear discrete-periodic systems is investigated in this paper. high-order fully-actuated models for discrete periodic time-varying are constructed, a criterion based on system proposed. On basis, stabilization as the fundamental issue studied state-feedback laws designed via approach parametric design, which converted original into pole assignment constant systems. Finally, numerical example given to verify validity feasibility proposed method.

This paper presents a novel method for channel estimation and signal detection in MIMO-OFDM systems based on the expectation-maximization algorithm (EM). In contrast to standard pilot aided interpolation methods, of given frequency bin without symbols is posed as maximum likelihood (ML) with missing observations solved by iterative EM algorithm. As semi-blind method, insensitive permutation scaling transmitted signals. To avoid this uncertainty, initialization optimization each achieved...

In SDN (Software Defined Network) environments, for the security considerations of upper-layer application behaviors, we need to consider adding an access control mechanism northbound interface layer limit capabilities applications, thereby improving SDN. addition, considering performance and management requirements SDN, features including cross-domain support should be considered. this paper, proposed MD-UCON model with role extension based on UCON role-based mechanism. At same time,...

Channel estimation is crucial in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems, especially with a few training sequences. To solve the problem of uplink channel mmWave MIMO PARAFAC-based algorithm proposed for joint multiuser channels. The orthogonal frequency divisional multiplexing (OFDM) technique exploited to combat selective fading In this paper, received signal at base station (BS) formulated as third-order parallel factor (PARAFAC) tensor, and then...

In order to solve the problem of signal detection and channel estimation in multiuser multiple-input multiple-out (MIMO) relay systems, a method joint based on parallel factor (PARAFAC) model has been proposed this paper. Above all, paper considers Gaussian multiple-access with an amplify-and-forward (AF) relay. Each users spreads corresponding information symbol matrix encodes it using space-time coding technique. And amplifies received signals forwards amplified destination. After being...

MIMO (Multiple-Input Multiple-Output) radar has drawn considerable attention due to its advantages that conventional doesn't have. Monostatic the anti-jamming and anti-stealth capacity, can also improve reliability localization accuracy of detecting targets. In this paper, we propose a monostatic target method based on parallel factor (PARAFAC) model. The proposed does not impose constraints signals, optimize feature radar. Comparing with classical radar-imaging-based methods, much better...

Compliant capture of the space non-cooperative targets is a key technology in on-orbit services. A great challenge that multi-dimensional contact force generated by tumbling target can destabilize spacecraft-manipulator system (SMS), which may eventually cause failure task. full-dimensional controllable damping mechanism (FDCDM) with gyroscopic structure introduced into joint SMS to buffer forces during capture. The six-dimensional outputs FDCDM be equivalent actuator end joint, could form...

The space target capturing task using the spacecraft-manipulator system (SMS) has special significance in on-orbit servicing due to its theoretical challenges and practical value. contact force between end effector (gripper) exerted by tumbling motion of destabilizes spacecraft base. A full-dimensional controllable damping mechanism (FDCDM) with a cross-axis structure was designed buffer transient impact on joint. introduction gives robot variable stiffness system, estimation algorithm is...