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Asymptotic performance of woven graph codes

Constructions of woven graph codes based on constituent block and convolutional codes are studied. It is shown that within the random ensemble of such codes based on s-partite, s-uniform hypergraphs, where s depends only on the code rate, there exist codes satisying the Varshamov-Gilbert (VG) and the Costello lower bound on the minimum distance and the free distance, respectively.

A Numerical Method for Design of PI Controllers

This paper presents an efficient numerical method to design PI controllers. The design is based on optimization of the load disturbance rejection, with constraints on the sensitivity and weighting of the set point response. Thus, the formulation of the design problem captures many aspects of industrial control problems. It leads to a nonconvex optimization problem. Efficient ways to solve the prob

A gap metric perspective of well-posedness for nonlinear feedback interconnections

A differential geometric approach based on the gap metric is taken to examine the uniqueness of solutions of the equations describing a feedback interconnection. It is shown that under sufficiently small perturbations on the Fréchet derivative of a nonlinear plant as measured by the gap metric, the uniqueness property is preserved if solutions exist given exogenous signals. The results developed r

An Industrial Dead-Time Compensating PI Controller

An industrial PI controller with dead-time compensation is presented. The advantage of the new controller compared with other dead-time compensating controllers is that it contains only three adjustable parameters; the gain, the integral time, and the dead time. The simple parametrization is obtained by calculating the process model needed for the dead-time compensation from the controller paramet