Electrical and Electronics Commons^™

Quasilinear Control Of Systems With Time-Delays And Nonlinear Actuators And Sensors, Wei-Ping Huang

Graduate College Dissertations and Theses

This thesis investigates Quasilinear Control (QLC) of time-delay systems with nonlinear actuators and sensors and analyzes the accuracy of stochastic linearization for these systems. QLC leverages the method of stochastic linearization to replace each nonlinearity with an equivalent gain, which is obtained by solving a transcendental equation. The idea of QLC is to stochastically linearize the system in order to analyze and design controllers using classical linear control theory. In this thesis, the existence of the equivalent gain for a closed-loop time-delay system is discussed. To compute the equivalent gain, two methods are explored. The first method uses an explicit …

Decoupled Reference Governors For Multi-Input Multi-Output Systems, Yudan Liu

Graduate College Dissertations and Theses

In this work, a computationally efficient solution for constraint management of square

multi-input multi-output (MIMO) systems is presented. The solution, referred to as

the Decoupled Reference Governor (DRG), maintains the highly-attractive computational

features of scalar reference governors (SRG) compared to Vector Reference

Governor (VRG) and Command Governor (CG). This work focuses on square MIMO

systems that already achieve the desired tracking performance. The goal of DRG is to

enforce output constraints and simultaneously ensure that the degradation to tracking

performance is minimal. DRG is based on decoupling the input-output dynamics

of the system so that every channel of the system …

Leveraging Software-Defined Radio For A Scalable Wide-Band Wireless Channel Measurement System, James Jamison

Graduate College Dissertations and Theses

Wireless channel characterization is important for determining both the requirements for a wireless system and its resulting reliability. Wireless systems are becoming ever more pervasive and thus are expected to operate in increasingly more cluttered environments. While these devices may be fixed in location, the channel is still far from ideal due to multipath. Under such conditions, it is desirable to have a means of taking wireless channel measurements in a low-cost and distributed manner, which is not always possible using typical channel measurement equipment.

This thesis leverages a software-defined radio (SDR) platform to perform wideband wireless channel measurements. Specifically, …