SUMMARY This paper proposes the use of the fictitious reference iterative tuning (FRIT) method, which has been developed for controller gain tuning in single‐input single‐output systems, in state feedback gain tuning for a single‐input multivariable system. The transient response data for a single‐input multivariable plant obtained in closed‐loop operation is used for model matching by FRIT in the time domain. The data is also used in the frequency domain to estimate the stability and improve the control performance of the closed‐loop system with the state feedback gain tuned by the FRIT method. The FRIT method is applied to a state feedback control system for an inverted pendulum with an inertial rotor, and its usefulness is illustrated through experiments. © 2013 Wiley Periodicals, Inc. Electron Comm Jpn, 97(1): 1–11, 2014; Published online in Wiley Online Library (http://wileyonlinelibrary.com). DOI 10.1002/ecj.11506

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In this paper, a simple scheme to estimate frequency responses of linear time-invariant single-input singleoutput (SISO) systems based on closed-loop step response data is investigated. The method uses only a single set of step response data of plants under closed-loop operating conditions. The input and output of a plant are filtered by a simple bandpass filter, and the frequency response of the plant is obtained with the Discrete Fourier Transforms (DFTs) of the filtered input and output signals. The validity of the proposed method is illustrated through simulations and experiments.

Professional wireless cameras using the millimeter-wave band can transmit more information than those in the UHF band, making this band especially useful for transmitting high-quality video and audio with low latency. Although such devices have been put into practical use, there is a need to downsize the equipment on the camera side to reduce expensive millimeter-wave band components and improve operability. In this study, we configure the downlink of a professional wireless camera for UHDTV as a single frequency network (SFN) and study the expansion of coverage provided by a booster. A coupling loop interference canceller and multi-path equalizer are installed in the booster. A computer simulation shows that the booster works well. SFN interference, in which the master and booster waves multiply propagate, can be equalized through frequency domain equalization (FDE) of the single-carrier (SC) system at the receiver side.

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