Performance of Outer-Loop Control for AMC Based on Mutual Information in MIMO-OFDM Downlink

2012 ◽  
Author(s):  
Teppei Ebihara ◽  
Hidekazu Taoka ◽  
Nobuhiko Miki ◽  
Mamoru Sawahashi
Keyword(s):  
Mutual Information ◽  
Outer Loop ◽  
Loop Control ◽  
Mimo Ofdm

Performance of Outer-Loop Control for Adaptive Modulation and Coding Based on Mutual Information in OFDM MIMO SDM

2015 ◽  
Vol E98.B (8) ◽  
pp. 1506-1517 ◽  
Author(s):  
Teppei EBIHARA ◽  
Yasuhiro KUGE ◽  
Hidekazu TAOKA ◽  
Nobuhiko MIKI ◽  
Mamoru SAWAHASHI
Keyword(s):  
Mutual Information ◽  
Adaptive Modulation ◽  
Adaptive Modulation And Coding ◽  
Outer Loop ◽  
Loop Control

scholarly journals A Robust Inner and Outer Loop Control Method for Trajectory Tracking of a Quadrotor

Sensors ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 2147 ◽  
Author(s):  
Dunzhu Xia ◽  
Limei Cheng ◽  
Yanhong Yao
Keyword(s):  
Trajectory Tracking ◽  
Control Method ◽  
Outer Loop ◽  
Loop Control

Closed-loop system disturbance recovery

2003 ◽  
Vol 217 (6) ◽  
pp. 631-649 ◽  
Author(s):  
R Whalley ◽  
M Ebrahimi
Keyword(s):  
Closed Loop ◽  
Low Frequency ◽  
Closed Loop Control ◽  
Multivariable System ◽  
Closed Loop System ◽  
Outer Loop ◽  
Loop Control ◽  
Passive Network ◽  
Loop Tuning ◽  
Reference Input

The regulation of linearized multivariable system models, following input set point and load disturbance changes, is considered. An inner and outer closed-loop control strategy is outlined, enabling targeted recovery rates, offset attenuation and low steady state interaction to be achieved. Proportional control and passive network compensation alone are employed. Gain ratio selection and outer loop tuning are exercised, ensuring thereby the confinement of output perturbations to low-frequency load disturbances and reference input changes. Application studies are presented for purposes of comparison.

Dryout Avoidance Control for Multi-Evaporator Vapor Compression Cycles With Transient Heat Flux

2014 ◽  
Author(s):  
Daniel T. Pollock ◽  
Zehao Yang ◽  
John T. Wen
Keyword(s):  
Heat Flux ◽  
Flow Rate ◽  
Coolant Flow ◽  
Coolant Flow Rate ◽  
High Heat Flux ◽  
Vapor Compression ◽  
Transient Heating ◽  
Outer Loop ◽  
Two Phase ◽  
Loop Control

Multiple-evaporator vapor compression cycles may be used for distributed cooling of high heat-flux systems, such as arrays of high-power electronics. Under transient heating conditions, these systems must be carefully controlled to avoid critical heat flux (CHF) due to evaporator dryout. An active control strategy is presented that regulates two-phase flow quality in multiple evaporators in order to avoid critical quality under transient heating conditions. A two-loop control system is used, in which an outer loop uses model-based feedforward combined with evaporator wall temperature feedback to determine the necessary coolant flow rate to avoid CHF, while an inner loop uses system actuators (variable speed compressor, electronic expansion valves) to track to the desired flow rate. An advantage of this approach is that the inner-loop control handles the system complexity arising from pressure coupling and actuator nonlinearity. Additionally, the outer-loop quality control may be applied to other two-phase cooling schemes, for instance pumped systems, by providing coolant flow rate setpoints. Simulations and corresponding experimental controller validation were conducted using a three-evaporator vapor compression testbed with transient imposed heat-flux.

Research of Wind Power into the Grid Based on Large-Capacity Parallel Converter Modules

2011 ◽  
Vol 383-390 ◽  
pp. 5899-5906
Author(s):  
Fei Ye ◽  
Zhong Dong Yin ◽  
Chen Xin Dai
Keyword(s):  
Control Method ◽  
Power Grid ◽  
Dead Zone ◽  
Loop Current ◽  
Parallel Operation ◽  
Outer Loop ◽  
Loop Control ◽  
Three Phase ◽  
The Dead ◽  
Three Phase Inverter

The converters connected to the power grid, including rectifier and inverter. The rectifier uses DC voltage outer loop control method and the input current inner loop control method, three-phase inverter output current uses SPWM modulation. With the capacity of the system increasing, the capacity of a single converter can no longer meet the requirements, for improving the system's power grid, reliability and efficiency, converters can be paralleled. Parallel operation generates loop current; one of the effective methods of suppressing the loop current is to connect limiting inductance in the inverter AC side. Through simulation, gets the suitable inductance value, and researches the dead zone time affecting on the loop current. When the dead zone times of two modules are not equal, the loop current increases.

Multivariable System Regulation

2006 ◽  
Vol 220 (5) ◽  
pp. 653-667 ◽  
Author(s):  
R Whalley ◽  
M Ebrahimi
Keyword(s):  
Controller Design ◽  
Cost Effective ◽  
Output Coupling ◽  
Outer Loop ◽  
Control Effort ◽  
Loop Control ◽  
Effective Implementation ◽  
Feedback Structure ◽  
Loop Feedback ◽  
Frequency Domain Techniques

The regulation of multivariable systems which are subjected to input set point changes and disturbances is considered. A regulation strategy, for analysis purposes, employing both an inner- and an outer-loop feedback structure is proposed. Prescribed, closed-loop, dynamic behaviour using minimum control effort while confining steady-state output coupling is achieved. Output recovery, following disturbance perturbations, via proportional, outer-loop control is advocated. Elementary procedures enabling the computation of conventional pre and feedback compensators are provided, facilitating thereby cost-effective implementation. Stability assessment via established frequency domain techniques is acknowledged. Application studies, enabling comparisons with existing controller design methods, are outlined.

Sign in / Sign up

Export Citation Format

Share Document