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Global Asymptotic Control for Uncertain Stochastic Time-delay Systems with Unmodeled Dynamics
Qianjin Zhao,Shanshan Xiang,Xiaobo Li,Jian Wu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3
This paper considers the global adaptive regulation by dynamic partial state feedback method for a class of uncertain stochastic time-delay cascade system with asymmetric structure and nonlinear parameterization. The global asymptotic stability can be achieved under input-to-state stability (ISS) like the condition based on the zerodynamics with time delay. The partial state adaptive control scheme with a delay-independent has been developed by employing the adaptive feedback domination design. By constructing suitable Lyapunov-Krasovskii functionals, it is proven that all the states of the closed-loop system signals can be regulated to the origin. Meanwhile, the boundedness of the closed-loop system signals is kept. Simulation results further demonstrate the effectiveness of the proposed method.
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Improved Wideband Precoding with Arbitrary Subcarrier Grouping in MIMO-OFDM Systems
Hang Long,Kyeong Jin Kim,Wei Xiang,Shanshan Shen,Kan Zheng,Wenbo Wang 한국전자통신연구원 2012 ETRI Journal Vol.34 No.1
Precoding in the multiple-input multiple-output orthogonal frequency division multiplexing system is investigated. In conventional wideband precoding (WBP), only one precoder, obtained from the decomposition of the subcarrier independent channel matrix, is used for all subcarriers. With an investigation of the relationship between the subcarrier independent channel matrix and the temporal/frequency channels, an improved WBP scheme is proposed for practical scenarios in which a part of subcarriers are allocated to a user. The improved WBP scheme is a generalized scheme of which narrow-band precoding and conventional WBP schemes are special modes. Simulation results demonstrate that the improved WBP scheme almost achieves the optimum performance of a single precoder and outperforms the conventional WBP scheme in terms of the bit error ratio and ergodic capacity with slight complexity increase. The largest advantage of the improved WBP scheme on signal-to-noise ratio in simulation results is over 2.1 dB.
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