查询词典 feedback control system

to reduce the impact of carrier frequency offset in ofdm system,this thesis designs a new carrier frequency offset estimation scheme for ofdm system.the carrier frequency offset estimation includes acquisition and tracking.we adopt variable step size adaptive algorithm.the acquisition range of the proposed algorithm is as large as one half of the overall signal bandwidth.through this method we can not only avoid the feedback by using forward error correction,but also reduce the times of complex multiplication in order to reduce the power consumption of the system.this algorithm not only has low complexity and fast convergence nut also can improve the demodulation performance of ofdm system.computer simulation illustrates the superior performance of the proposed algorithm with regard to estimation accuracy in both awgn channel and multi—path channel.

摘 要：为了减小正交频分复用系统受频率偏差的影响，在ofdm系统中设计了一种新的载波频偏估计算法。频偏估计包括跟踪和捕获两个阶段，文中采用变步长自适应算法来进行跟踪，这个跟踪算法的捕捉范围是整个信号带宽的一半。通过此方法，不但可以利用前向纠错的方式来避免反馈，而且可以缩减复数乘法的次数以降低计算复杂度和系统功耗。该方法运算复杂度低，并具有较好的收敛性，能改善odfm的解调性能。从计算机的仿真效果可以看出无论是在awgn信道上还是在多径信道上都表现出了卓越的性能。

Since the company was founded, with accurate market positioning, rapid feedback, agile management thinking, be bold to introduce scientific research personnel, quickly established independent scientific and technological innovation system, the combination of international and domestic technological advantages, better suited to the Chinese market product positioning, and capture the market opportunities and won the trust of our customers, to become one of Huatai Machines China dyeing machinery industry the most complete product varieties, the most technologically advanced, the most superb quality manufacturers and one of the most competitive brands Enterprises, through strict implementation of ISO9001 international quality management system standards and 14001 international environmental management system standard, established based on continuous improvement of the quality management system, ends in September 2006, the company has ISO9000 quality OIA member of the staff has more than 70

公司创立以来，以准确的市场定位，快速的信息反馈，敏捷的管理思维，大胆引进科研人才，迅速建立起自主科技创新体系，结合国际，国内技术优势，以更适合中国市场的产品定位，抢占市场先机，赢得广大客户的信赖，使华泰印染机械一举成为中国印染机械行业产品品种最齐全，技术最先进，质量最精湛的制造商和最具竞争力的品牌之一企业通过严格贯彻ISO9001国际质量体系管理标准和14001国际环境体系管理标准，建立起了基于持续改进的质量管理体系，截止2006年9月，公司具备ISO9000内审员资质的员工已达70余名

The numerical results show that LQR could control the power flow transmission at the natural frequencies of the coupled system, but increase power transmission at the antiresonance frequencies. The position of the sensors in feedback control is important to the effect of the active isolation and the closedloop's stability.

研究结果表明：线性二次调节器可有效地控制系统共振时振动能量向基础的传递，但增加了系统反共振区域功率流的传递；在输出反馈控制中，从系统稳定性和可实现性上考虑，传感器应布置于隔振器与机器的连接点处。

Chaos synchronization for integral order system is accomplished by employing both linear feedback control and adaptive control based on Lyapunov first approximation theorem and asymptotical stability theorem.

利用线性回馈控制与适应性控制，使得整数阶系统达成浑沌同步。

Implementing a fuzzy logic controller in a simple neural network with less memory is valuable for the Distributed Control System . Fine coal ash feedback control is a key to get the best fine coal preparing results.

论文提出的用简单神经元网络实现模糊控制方法，为在集散式计算机控制系统中设计过程模糊控制提供了一种简易而节约内存的有效方法。

The control architecture and associated error equation are built for adaptive output feedback control. Then, a stable weight adjust rule for the no-line NN is derived by Lyapunov theory, thus assuring the stability of the closed-loop system.

NN的在线补偿规律由Lyapunov稳定性方法得到，保证了系统的稳定性，可以有效补偿模型参数不确定和未建模动态引起的控制偏差。

Based on X-filtered LMS algorithm and -filtered LMS algorithm adaptive inverse control, we use a new variable step size LMS algorithm. Adding little computation, variable step size LMS algorithm can result in fast convergence speed and low residual error simultaneously. The adaptive feedback control can counteract the beginning error of the system. The adaptive disturbance canceler can best erase noises and disturbances.

在原来的X-滤波LMS算法自适应逆控制和-滤波LMS算法自适应逆控制方法的基础上，引入了新的变步长LMS算法，在计算量增加不多的前提下，能同时获得较快的收敛速度和较小的稳态误差；引入自适应的反馈补偿控制克服了被控系统的直流零频漂移，使控制系统在初开始工作阶段快速收敛；还引入自适应扰动消除器，它能最大限度的消除扰动。

A new scheme of double loop feedback computer control system, which is based on virtual instruments technology, is put forward to improve control performance.

随着数字电子技术、计算机控制技术的迅速发展，数字控制系统的应用越来越广，已成为各类控制系统发展的趋势。

Hydraulic elevator is a typical electrohydraulic control system, and the speed feedback control method is advanced technology.

液压电梯是一种典型的电液速度控制系统，直接轿厢速度反馈控制是一项先进的技术。

According to the Lyapunov stability theory, the weight update law of neural network, the adaptive law of error bound and the feedback control are obtained, thus the stability of closed-loop control system is ensured.

基于Lyapunov稳定性理论，得到了神经网络的权值更新律、误差界自适应律及反馈控制律，确保了闭环控制系统的稳定性。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。