In this paper, a robust sensor fault diagnosis observer with non-singular structure is proposed for a class of linear sampled-data descriptor system with state time-vary delay. Firstly, a sampled-data descriptor model...In this paper, a robust sensor fault diagnosis observer with non-singular structure is proposed for a class of linear sampled-data descriptor system with state time-vary delay. Firstly, a sampled-data descriptor model with time-vary delay is proposed and transformed into a discrete-time non-singular one. Then, a robust sensor fault diagnosis observer is proposed based on the state estimation error and the measurement residual, this observer can guarantee the robustness of the residual against the augmented disturbance and the sensor fault, which means the H∞ performance index is satisfied. As the confining matrix of the designed observer parameters does not meet the Linear Matrix Inequality (LMI), a cone complementary linearization (CCL) algorithm is proposed to solve this problem. The decision logic of the residual is obtained by the residual evaluation function. Simulation results show the effectiveness of the method.展开更多
In this paper, a time-switched space-time （TSST） coded orthogonal frequency division nmltiplexing （OFDM） scheme against the time-varying channels is proposed. In the TSST-OFDM scheme, it is equipped with four tran...In this paper, a time-switched space-time （TSST） coded orthogonal frequency division nmltiplexing （OFDM） scheme against the time-varying channels is proposed. In the TSST-OFDM scheme, it is equipped with four transmit antennas, but only double of them are used for coding in every time slot. It is shown that the signal to inter-antenna interference ratio is a function of Doppler frequency in time-varying channels for a given space-time code. The analyses and simulations results validate that the proposed scheme not only gets time- switched diversity and lower decoding complexity, but also suffers less time-varying impairments. Hence, it ex- hibits better performance than quasi-orthogonal space-time coded scheme.展开更多
针对具有时变时延的网络化控制系统(networked control system,NCS),提出一种新的分散事件触发通讯机制。该机制可以有效的节约网络资源并且不依赖于状态数据的完整信息,若干个空间分布式传感器结点采集状态数据的局部信息并根据子传输...针对具有时变时延的网络化控制系统(networked control system,NCS),提出一种新的分散事件触发通讯机制。该机制可以有效的节约网络资源并且不依赖于状态数据的完整信息,若干个空间分布式传感器结点采集状态数据的局部信息并根据子传输机制传输信号。本文首先建立包含网络时延和分散事件触发条件的闭环NCS模型,然后利用Lyapunov稳定性理论和线性矩阵不等式方法给出闭环系统渐近稳定的充分条件,进而给出H∞控制器和分散事件触发机制的协同设计方法,最后通过Matlab数值仿真验证该方法的有效性。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.61021002)
文摘In this paper, a robust sensor fault diagnosis observer with non-singular structure is proposed for a class of linear sampled-data descriptor system with state time-vary delay. Firstly, a sampled-data descriptor model with time-vary delay is proposed and transformed into a discrete-time non-singular one. Then, a robust sensor fault diagnosis observer is proposed based on the state estimation error and the measurement residual, this observer can guarantee the robustness of the residual against the augmented disturbance and the sensor fault, which means the H∞ performance index is satisfied. As the confining matrix of the designed observer parameters does not meet the Linear Matrix Inequality (LMI), a cone complementary linearization (CCL) algorithm is proposed to solve this problem. The decision logic of the residual is obtained by the residual evaluation function. Simulation results show the effectiveness of the method.
基金Sponsored by the Science and Technology Project of Dalian,China (Grant No. 2011J21DW009)
文摘In this paper, a time-switched space-time （TSST） coded orthogonal frequency division nmltiplexing （OFDM） scheme against the time-varying channels is proposed. In the TSST-OFDM scheme, it is equipped with four transmit antennas, but only double of them are used for coding in every time slot. It is shown that the signal to inter-antenna interference ratio is a function of Doppler frequency in time-varying channels for a given space-time code. The analyses and simulations results validate that the proposed scheme not only gets time- switched diversity and lower decoding complexity, but also suffers less time-varying impairments. Hence, it ex- hibits better performance than quasi-orthogonal space-time coded scheme.
文摘针对具有时变时延的网络化控制系统(networked control system,NCS),提出一种新的分散事件触发通讯机制。该机制可以有效的节约网络资源并且不依赖于状态数据的完整信息,若干个空间分布式传感器结点采集状态数据的局部信息并根据子传输机制传输信号。本文首先建立包含网络时延和分散事件触发条件的闭环NCS模型,然后利用Lyapunov稳定性理论和线性矩阵不等式方法给出闭环系统渐近稳定的充分条件,进而给出H∞控制器和分散事件触发机制的协同设计方法,最后通过Matlab数值仿真验证该方法的有效性。
