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Transmit diversity is a hotspot in MIMO research. In fading channels, the relation of open loop transmit diversity and close loop transmit diversity and their performance contrast has not been studied.

发射分集是多天线MIMO系统的研究热点，在衰落信道中开环和闭环发射分集的关系，不同信道状态条件下的性能对比还缺乏深入研究。

A step response of open-loop or close-loop control system is given.

可以给出控制系统开环或者闭环的阶跃响应。

In view of the present major problems of the open-loop control system for economic CNC lathe with stepping motor as feed motor, a newtype of closed-loop control system for stepping motor has been presented in the paper.

针对目前以步进电机驱动的经济型 CNC车床开环控制系统存在的主要问题，提出了一种新型的步进电机闭环控制系统。

The teaching experiments such as open-loop control system, closed-loop control system, machine vision and the sensor measuring were realized based on the hardware platform and the software.

通过对系统硬件平台和软件平台的构建，完成了开环控制系统、闭环控制系统、机器视觉、传感器技术等多项教学实验内容。

This thesis make a study on Vector-control VVVF system of asynchronous motor. In the course of study,making use of the mathematical model of asynchronous motor in MT axes . Then both open-loop control system and close-loop vector-control system are respectively simulated with simulation block SIMULINK in MATLAB.

本文对异电动机变频调速系统进行了研究、利用异步电动机在二相同步旋转MT坐标系下的数学模型，使用MATLAB中的仿真工具箱SIMULINK分别对开环控制系统和闭环矢量控制变频调速系统进行了仿真。

This thesis make a study on Vector-contorl WVF system of asynchronous motor. In the course of study, making use of the mathematical model of asynchomous motor in MT axes. Then both open-loop control system and close-loop vector-control system are respectively simulated with simulation block SIMULINK in MATLAB.

本文对异步电动机变频调速系统进行了研究，利用异步电动机在二相同步旋转MT坐标系下的数学模型，使用MATLAB中的仿真工具箱SIMULINK分别对开环控制系统和闭环矢量控制变频调速系统进行了仿真。

In Chapter four, the stability problem of the nonlinear open-loop control system is discussed by the concept of input-output stability. The L〓 stability is defined, the relationship between the L〓 norm of output variable and the input variable is proven firstly, and the sufficient condition for the stability of open-loop system , the H〓 norm of the n-th order frequency response function decreasing by n!

本章给出了非线性控制系统L〓稳定性的定义，首次严格证明了输出变量的L〓范数与输入变量的L〓范数之间的一个重要的关系式，并得到了一个开环系统L〓稳定性的充分条件，即n阶广义频率响应函数的范数〓应按n！

The POD PWM technique is applied to the topology and the control strategies of the new type of single-phase five-level CSI topology in open-loop control system and in closed-loop control system are discussed.

该拓扑结果简单，所用开关数目和分流电感比同类拓扑更少，针对该拓扑，应用多载波POD PWM技术应用，分别研究了开环和闭环控制方案。

In testing omni-directional robot system, open-loop control and close-loop PID control are used to discuss the response of omni-directional mobile robot system, and then compared to the result of simulation to image servo control procedure.

全方位移动机器人系统实测上，利用开回路控制以及闭回路PID控制探讨其响应，再配合模拟结果比对，以完成整个影像伺服控制过程。

It proposes the control-output transfer function of the nondeal Buck converter using circuit average method, the model in Pspice 10.0, the open-loop and gain of the voltage control loop simulations of the system. A prototype of output power 15W has been made up, and the experimental results are agreed with the simulative results.

用电路平均建模法推导出非理想Buck变换器控制-输出的传递函数，在PSpice10.0环境下建立了仿真模型，对系统进行了开环和电压控制环路增益仿真，并在研制的15W实验样机上进行了系统的实验测试。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样