无线通讯网络功率和流量的预联合控制

To mitigate the loop delay in distributed wireless networks, a predictive power and rate control scheme is proposed for the system model that also accounts for the congestion levels and input delay instead of state-delayed in a network. A measurement feedback control problem with input delay is formulated by minimizing the energy of the difference between the actual and the desired signal-to-interference-plus-noise ratio (SNR) levels, as well as the energy of the control sequence. To solve this problem, we present two Riccati equations for the control and the estimation for the time delay systems. A complete analytical optimal controller is obtained by using the separation principle and solving two Riccati equations, where one is backward equation for stochastic linear quadratic regulation and the other is the standard filtering Riccati equation. Simulation results illustrate the performance of the proposed power and the rate control scheme.     

浅谈IP电话

问世100多年的电话正经历着它的第二次巨大变革.第一次是程控电话的出现,第二次则是随着网络技术发展而出现的IP电话,这种全新方法的出现,立刻引起了人们的普遍关注.它也是企业和消费者正缓慢地开始才采用的一种廉价的打电话方式.该文对IP电话基本原理和分类做了一个简单阐述.     

浅谈IP电话

问世100多年的电话正经历着它的第二次巨大变革。第一次是程控电话的出现,第二次则是随着网络技术发展而出现的IP电话,这种全新方法的出现,立刻引起了人们的普遍关注。它也是企业和消费者正缓慢地开始才采用的一种廉价的打电话方式。该文对IP电话基本原理和分类做了一个简单阐述。     

基于BRAS和PPPoE的认证方法分析及应用

1宽带接入技术和接入网的发展状况宽带接入技术将呈现多技术融合发展的局面,总体上将朝着高带宽方向发展。与此同时,用户需求的多样化决定了宽带接入将长期呈现多种接入技术的融合与协调发展的局面。     

带马尔科夫跳和乘积噪声的随机系统的最优控制

讨论了N个选手随机系统的最优控制问题. 设计了无限时间的带有马尔科夫跳和乘积噪声的随机系统的Pareto最优控制器. 应用推广的Lyapunov方法和解随机Riccati代数方程得到了系统的Pareto最优解, 证明了最优控制器是稳定的反馈控制器, 以及对应于最优控制器的反馈增益中的随机Riccati代数方程的解是最小解.     

无线通讯网络功率和流量的预联合控制

To mitigate the loop delay in distributed wireless networks,a predictive power and rate control scheme is pro- posed for the system model that also accounts for the conges- tion levels and input delay instead of state-delayed in a network. A measurement feedback control problem with input delay is formulated by minimizing the energy of the difference between the actual and the desired signal-to-interference-plus-noise ratio (SNR)levels,as well as the energy of the control sequence.To solve this problem,we present two Riccati equations for the con- trol and the estimation for the time delay systems.A complete analytical optimal controller is obtained by using the separation principle and solving two Riccati equations,where one is back- ward equation for stochastic linear quadratic regulation and the other is the standard filtering Riccati equation.Simulation re- sults illustrate the performance of the proposed power and the rate control scheme.