This letter introduces the notion of linear Discrete-time Output Negative Imaginary (D-ONI) systems. The D-ONI class is defined in z-domain and it includes systems having poles on unit circle. proposed definition involves a real parameter δ ≥ 0, which indicates strictness properties. > 0 specifies strict subset, Strictly (D-OSNI), within stable class. Interestingly, new captures existing D-NI w...

The problem of pole assignment, also known as an eigenvalue assignment, in linear discrete-time periodic systems in discs was solved by a novel method which employs elementary similarity operations. The former methods tried to assign the points inside the unit circle while preserving the stability of the discrete time periodic system. Nevertheless, now we can obtain the location of eigenvalues ...