The mode switching between spatial multiplexing （SM） and space-time block code （STBC） diversity is investigated for the multiple-input multiple-output （MIMO） automatic repeat request （ARQ） system. Five importa...The mode switching between spatial multiplexing （SM） and space-time block code （STBC） diversity is investigated for the multiple-input multiple-output （MIMO） automatic repeat request （ARQ） system. Five important practical factors are considered in the proposed switching scheme： transmit correlation, ARQ technique, packet loss probability （PLP） constraint, discrete rate transmission （DRT） and channel coding. Under the spatially correlated channel, the distributions of the post signal-to-interference-plus- noise ratio （SiNR） for the SM mode and the STBC mode are obtained by using Gamma approximations. Then this paper derives the closed-form expressions of the PLP and the throughput for different modes when the ARQ technique is employed, based on which the mode switching algorithm is proposed to improve the spectral efficency. In the simulation, the correction of the expressions is first verified. Then, the significant gain observed by the proposed algorithm is presented. Since the switching point is the key parameter to implement the mode switching, this paper also shows how the switching point is affected by the practical factors considered.展开更多
In this paper, the robust control problem of general nonlinear multi-input multi-output (MIMO) systems is proposed. The robustness against unknown disturbances is considered. Two algorithms based on the Sliding Mode C...In this paper, the robust control problem of general nonlinear multi-input multi-output (MIMO) systems is proposed. The robustness against unknown disturbances is considered. Two algorithms based on the Sliding Mode Control (SMC) for nonlinear coupled multi-input multi-output (MIMO) systems are proposed: the first order sliding mode control (FOSMC) with saturation (sat) function and the FOSMC with sat combined with integrator controller. Those algorithms were simulated and implemented on the three tanks test-bed system and the exprimental results confirm the effectiveness of our control design.展开更多
In this study an indirect adaptive sliding mode control (SMC) based on a fuzzy logic scheme is proposed to strengthen the tracking control performance of a general class of multi-input multi-output (MIMO) nonlinear un...In this study an indirect adaptive sliding mode control (SMC) based on a fuzzy logic scheme is proposed to strengthen the tracking control performance of a general class of multi-input multi-output (MIMO) nonlinear uncertain systems. Combining reaching law approach and fuzzy universal approximation theorem, the proposed design procedure combines the advantages of fuzzy logic control, adaptive control and sliding mode control. The stability of the control systems is proved in the sense of the Lyapunov second stability theorem. Two simulation studies are presented to demonstrate the effectiveness of our new hybrid control algorithm.展开更多
在5G多模终端多天线系统设计中,需要进行阵列参数估计,提出一种基于多输入多输出(Multi input multi output,MIMO)的5G多模终端多天线系统设计方法,进行5G多模终端多天线传感阵元联合参数估计,提高对目标检测和识别能力.采用多分辨的近...在5G多模终端多天线系统设计中,需要进行阵列参数估计,提出一种基于多输入多输出(Multi input multi output,MIMO)的5G多模终端多天线系统设计方法,进行5G多模终端多天线传感阵元联合参数估计,提高对目标检测和识别能力.采用多分辨的近场源分布阵列构建5G多模终端多天线的传感阵元目标阵列分布节点模型,采用多传感器联合跟踪识别方法构建5G多模终端多天线系统的传输信道模型,结合MIMO系统的窄带分布源特性,建立5G多模终端多天线系统的接收端信号检测模型,采用匹配滤波器进行5G多模终端多天线输出的阵列优化模式和检测滤波设计,提高对5G多模终端多天线输出信号的波束集成能力,采用自适应波束形成算法,实现5G多模终端多天线系统的多波束集成分布式传输设计,在MIMO系统中实现5G多模终端多天线通信和信号传输.仿真结果表明,采用该方法进行5G多模终端多天线系统设计的信道均衡性较好,输出稳定性较强,5G多模终端多天线输出的误码率较低.展开更多
对多用户多输入多输出系统(multiple input multiple output,MIMO)传输模式切换进行了研究,在迫零(zero forcing,ZF)和最大传输比(maximal ratio transmit,MRT)两种预编码方式以及不同传输数据流数所定义的几种传输模式中,选取吞吐率最...对多用户多输入多输出系统(multiple input multiple output,MIMO)传输模式切换进行了研究,在迫零(zero forcing,ZF)和最大传输比(maximal ratio transmit,MRT)两种预编码方式以及不同传输数据流数所定义的几种传输模式中,选取吞吐率最大的最优传输模式进行数据发送.首先,通过引入偏离角的概念,建立了发射端信道状态信息(channel state information at the transmitter,CSIT)误差模型;在此基础上,分析了CSIT误差对于ZF和MRT传输性能的影响,并给出了在CSIT误差与信噪比组成的二维空间中最优传输模式区域划分;最后,提出一种低复杂度的快捷传输模式切换算法.理论分析和仿真结果表明,在不同程度的CSIT误差条件下,该算法仍可保证可达吞吐率与信噪比间近似线性增长.展开更多
基金supported by the Chinese Important National Science and Technology Specific Project(2010ZX03002-003-01)
文摘The mode switching between spatial multiplexing （SM） and space-time block code （STBC） diversity is investigated for the multiple-input multiple-output （MIMO） automatic repeat request （ARQ） system. Five important practical factors are considered in the proposed switching scheme： transmit correlation, ARQ technique, packet loss probability （PLP） constraint, discrete rate transmission （DRT） and channel coding. Under the spatially correlated channel, the distributions of the post signal-to-interference-plus- noise ratio （SiNR） for the SM mode and the STBC mode are obtained by using Gamma approximations. Then this paper derives the closed-form expressions of the PLP and the throughput for different modes when the ARQ technique is employed, based on which the mode switching algorithm is proposed to improve the spectral efficency. In the simulation, the correction of the expressions is first verified. Then, the significant gain observed by the proposed algorithm is presented. Since the switching point is the key parameter to implement the mode switching, this paper also shows how the switching point is affected by the practical factors considered.
文摘In this paper, the robust control problem of general nonlinear multi-input multi-output (MIMO) systems is proposed. The robustness against unknown disturbances is considered. Two algorithms based on the Sliding Mode Control (SMC) for nonlinear coupled multi-input multi-output (MIMO) systems are proposed: the first order sliding mode control (FOSMC) with saturation (sat) function and the FOSMC with sat combined with integrator controller. Those algorithms were simulated and implemented on the three tanks test-bed system and the exprimental results confirm the effectiveness of our control design.
文摘In this study an indirect adaptive sliding mode control (SMC) based on a fuzzy logic scheme is proposed to strengthen the tracking control performance of a general class of multi-input multi-output (MIMO) nonlinear uncertain systems. Combining reaching law approach and fuzzy universal approximation theorem, the proposed design procedure combines the advantages of fuzzy logic control, adaptive control and sliding mode control. The stability of the control systems is proved in the sense of the Lyapunov second stability theorem. Two simulation studies are presented to demonstrate the effectiveness of our new hybrid control algorithm.
文摘在5G多模终端多天线系统设计中,需要进行阵列参数估计,提出一种基于多输入多输出(Multi input multi output,MIMO)的5G多模终端多天线系统设计方法,进行5G多模终端多天线传感阵元联合参数估计,提高对目标检测和识别能力.采用多分辨的近场源分布阵列构建5G多模终端多天线的传感阵元目标阵列分布节点模型,采用多传感器联合跟踪识别方法构建5G多模终端多天线系统的传输信道模型,结合MIMO系统的窄带分布源特性,建立5G多模终端多天线系统的接收端信号检测模型,采用匹配滤波器进行5G多模终端多天线输出的阵列优化模式和检测滤波设计,提高对5G多模终端多天线输出信号的波束集成能力,采用自适应波束形成算法,实现5G多模终端多天线系统的多波束集成分布式传输设计,在MIMO系统中实现5G多模终端多天线通信和信号传输.仿真结果表明,采用该方法进行5G多模终端多天线系统设计的信道均衡性较好,输出稳定性较强,5G多模终端多天线输出的误码率较低.
文摘对多用户多输入多输出系统(multiple input multiple output,MIMO)传输模式切换进行了研究,在迫零(zero forcing,ZF)和最大传输比(maximal ratio transmit,MRT)两种预编码方式以及不同传输数据流数所定义的几种传输模式中,选取吞吐率最大的最优传输模式进行数据发送.首先,通过引入偏离角的概念,建立了发射端信道状态信息(channel state information at the transmitter,CSIT)误差模型;在此基础上,分析了CSIT误差对于ZF和MRT传输性能的影响,并给出了在CSIT误差与信噪比组成的二维空间中最优传输模式区域划分;最后,提出一种低复杂度的快捷传输模式切换算法.理论分析和仿真结果表明,在不同程度的CSIT误差条件下,该算法仍可保证可达吞吐率与信噪比间近似线性增长.
