A new preamble structure and design method for orthogonal frequency division multiplexing（OFDM）systems is described,which results a two-symbol long training preamble.The preamble contains four parts,the first part i...A new preamble structure and design method for orthogonal frequency division multiplexing（OFDM）systems is described,which results a two-symbol long training preamble.The preamble contains four parts,the first part is the same as the third,and the four parts are calculated by using nonlinear programming（NLP）model such that the moving correlation of the preamble results a steep rectangular-like pulse of certain width,whose step-down indicates the timing offset.Simulation results in AWGN channel are given to evaluate the perf o rmance of the proposed preamble design.展开更多
地热能是可再生能源之一,而地源热泵系统是应用地热能的一种重要方式。为提升工作效率,基于Visual Studio 2022开发平台,以C#编程语言下的WPF框架开发了一款地源热泵多能耦合系统方案设计软件,并依托于某项目对该软件在实际工程中的可...地热能是可再生能源之一,而地源热泵系统是应用地热能的一种重要方式。为提升工作效率,基于Visual Studio 2022开发平台,以C#编程语言下的WPF框架开发了一款地源热泵多能耦合系统方案设计软件,并依托于某项目对该软件在实际工程中的可用性、准确性进行了验证。该软件运行结果表明选用2台某地源热泵机组及5台某空气源热泵机组可承担该项目冷热负荷,每年耗能为4347.36MWh,总能耗费用449.53万元,单平米能耗费用33.30元/m^(2),在得到特定比例补贴的情况下投资成本总计3545.92万元,单平米造价262.66元/m^(2),与原设计方案一致。展开更多
A policy iteration algorithm of adaptive dynamic programming（ADP） is developed to solve the optimal tracking control for a class of discrete-time chaotic systems. By system transformations, the optimal tracking prob...A policy iteration algorithm of adaptive dynamic programming（ADP） is developed to solve the optimal tracking control for a class of discrete-time chaotic systems. By system transformations, the optimal tracking problem is transformed into an optimal regulation one. The policy iteration algorithm for discrete-time chaotic systems is first described. Then,the convergence and admissibility properties of the developed policy iteration algorithm are presented, which show that the transformed chaotic system can be stabilized under an arbitrary iterative control law and the iterative performance index function simultaneously converges to the optimum. By implementing the policy iteration algorithm via neural networks,the developed optimal tracking control scheme for chaotic systems is verified by a simulation.展开更多
基金supported by the National Natural Science Foundation of China under Grant No. 60501018
文摘A new preamble structure and design method for orthogonal frequency division multiplexing（OFDM）systems is described,which results a two-symbol long training preamble.The preamble contains four parts,the first part is the same as the third,and the four parts are calculated by using nonlinear programming（NLP）model such that the moving correlation of the preamble results a steep rectangular-like pulse of certain width,whose step-down indicates the timing offset.Simulation results in AWGN channel are given to evaluate the perf o rmance of the proposed preamble design.
文摘地热能是可再生能源之一,而地源热泵系统是应用地热能的一种重要方式。为提升工作效率,基于Visual Studio 2022开发平台,以C#编程语言下的WPF框架开发了一款地源热泵多能耦合系统方案设计软件,并依托于某项目对该软件在实际工程中的可用性、准确性进行了验证。该软件运行结果表明选用2台某地源热泵机组及5台某空气源热泵机组可承担该项目冷热负荷,每年耗能为4347.36MWh,总能耗费用449.53万元,单平米能耗费用33.30元/m^(2),在得到特定比例补贴的情况下投资成本总计3545.92万元,单平米造价262.66元/m^(2),与原设计方案一致。
基金supported by the National Natural Science Foundation of China(Grant Nos.61034002,61233001,61273140,61304086,and 61374105)the Beijing Natural Science Foundation,China(Grant No.4132078)
文摘A policy iteration algorithm of adaptive dynamic programming（ADP） is developed to solve the optimal tracking control for a class of discrete-time chaotic systems. By system transformations, the optimal tracking problem is transformed into an optimal regulation one. The policy iteration algorithm for discrete-time chaotic systems is first described. Then,the convergence and admissibility properties of the developed policy iteration algorithm are presented, which show that the transformed chaotic system can be stabilized under an arbitrary iterative control law and the iterative performance index function simultaneously converges to the optimum. By implementing the policy iteration algorithm via neural networks,the developed optimal tracking control scheme for chaotic systems is verified by a simulation.
