The dynamic process of TCSC is considered in the system model and the nonlinear characteristic is reserved. An adaptive gain control law is applied to real-time para-meter estimation.

An adaptive iterative feedback control approach was proposed for a class of single-input, single-output uncertain nonlinear systems with completely unknown control gain.

For the OFDM system, a scheme of combining space-time code with the adaptive power control technology is proposed with simulation results, which increases the diversity gain and the adaptive gain.