An iterative learning control algorithm using quantized error information is proposed in this article for both linear and nonlinear systems. The actual output is first compared with the reference signal and then the corresponding error is quantized and transmitted. A logarithmic quantizer is used to guarantee an adaptive improvement for tracking performance. The tracking error under this scheme...

There are two significant goals in teleoperation systems: Stability and performance. This paper introduces an LMI-based robust control method for bilateral transparent teleoperation systems in presence of model mismatch. The uncertainties in time delay in communication channel, task environment and model parameters of master-slave systems is called model mismatch. The time delay in communicatio...

Introduction: Application of biofeedback techniques in rehabilitation has turned into an exciting research area during the recent decade. Providing an appropriate visual or auditory biofeedback signal is the most critical requirement of a biofeedback technique. In this regard, changes in Surface Electromyography (SEMG) signals during wrist movement can be used to generate an indictable visual b...

Control theory principles have been used to gain understanding on how the different components of the oculomotor system operate. The purpose of this paper is to use the knowledge about how the visual system organizes these components to propose a new tracking paradigm. The tracking system is assumed to be described by linear time-invariant discrete-time state-space equations. The inputs to this...

The optimization of the modulation for open service (OS) signal located at L1 band in the working of global navigation satellite system (GNSS) signals design has some particularity, since this signal has huge amount of potential users and very wide application fields. For different application requirements, the expectations for performance and complexity are difference. A competitive OS signal ...

In a millimeter wave (mmWave) communication system with transmit/receive (Tx/Rx) beamforming antennas, small variation in device behavior or an environmental change can destroy beam alignment, resulting in power loss in the received signal. In this situation, the beam-tracking technique purely based on the received signal is not effective because both behavioral changes (rotation, displacement)...

In this paper we consider the study of the servomechanism problem for multi-input multi-output (MIMO) linear time-invariant (LTI) positive systems. In particular, we present results on the tracking problem of nonnegative constant reference signals for unknown stable MIMO positive LTI systems with nonnegative constant disturbances. Our results exploit the structure of tuning regulators and show ...

In this letter, stable direct and indirect adaptive controllers are presented that use Takagi–Sugeno (T–S) fuzzy systems, conventional fuzzy systems, or a class of neural networks to provide asymptotic tracking of a reference signal vector for a class of continuous time multi-input multi-output (MIMO) square nonlinear plants with poorly understood dynamics. The direct adaptive scheme allows for...

Two most common tasks in controller design is regulation and signal tracking. Regulating controllers try to keep system stably in a fixed state. Balancing an inverted pendulum or keeping the speed a car at constant level are most obvious examples of regulation problems. All kinds of servomechanisms, such as autopilots and robotic arms, are the examples of signal tracking problems. An open-loop ...