Design of An Arcak-Type Generalized H_2 Filter for Delayed Static Neural Networks

In this paper, an Arcak-type generalized \(H_2\) filter is designed for a class of static neural networks with time-varying delay. By employing some inequalities and constructing a suitable Lyapunov functional, a delay-dependent condition is derived by means of linear matrix inequalities such that the filtering error system is globally asymptotically stable and a prescribed generalized \(H_2\) performance is achieved. It is shown that the design of such a desired filter for a delayed static neural network is successfully transformed into solving a convex optimization problem subject to some linear matrix inequalities. It is thus facilitated readily by some standard algorithms. A numerical example is finally provided to show the effectiveness of the developed approach. A comparison on the generalized \(H_2\) performance for different gain parameters of the activation function is also given.     

车联网中基于联盟合作博弈的带宽分享策略

近几年来,车联网领域快速发展并引起广泛关注.在此背景下提出了一种混合Wi-Fi、WiMAX和3G/LTE的网络架构,在这种架构下,车辆可以根据自身的情况选择合适的方式接入网络.网络带宽分享采用基于联盟合作博弈的方式,车辆可以选择加入或离开合作联盟来最大化自身收益.模型从理论上证明了通过车辆间的效用分配与博弈合作,最终将形成一个纳什稳定的联盟划分并能适应车辆的动态变化.仿真结果表明,模型的算法性能接近于最优联盟分配.     

建筑用位置固定节点的无线传感器网络的设计

针对智能建筑中无线传感器网络物理位置固定的特点,设计了一种通讯协议简单的无线传感器网络。以建筑物的层高、纵向房间号和横向房间编号为已知信息对,无线传感器的地址编码,设计三维立方模型,使得每个节点可获得整个网络的拓扑信息。最后通过在智能建筑照明中的应用得以验证。     

On co-channel and adjacent channel interference mitigation in cognitive radio networks

Cognitive radio (CR) is an emerging wireless communications paradigm of sharing spectrum among licensed (or, primary) and unlicensed (or, CR) users. In CR networks, interference mitigation is crucial not only for primary user protection, but also for the quality of service of CR user themselves. In this paper, we consider the problem of interference mitigation via channel assignment and power allocation for CR users. A cross-layer optimization framework for minimizing both co-channel and adjacent channel interference is developed; the latter has been shown to have considerable impact in practical systems. Cooperative spectrum sensing, opportunistic spectrum access, channel assignment, and power allocation are considered in the problem formulation. We propose a reformulation–linearization technique (RLT) based centralized algorithm, as well as a distributed greedy algorithm that uses local information for near-optimal solutions. Both algorithms are evaluated with simulations and are shown quite effective for mitigating both types of interference and achieving high CR network capacity.     

QoS-IP业务的根本保证

介绍了目前在IP网络上实现QoS的主要架构，并着重阐述了Differv这种主流架构的原理，以及以Alcatel 7750 SR为代表的新一代面向业务设计的网络设备对于QoS的支持能力。     

基于10 Gbit/s器件的40 Gbit/s IM/DD-OFDM 40 km单模光纤传输

随着通信技术的快速发展,如何在有限的带宽下实现信息的低成本、大容量的传输引起了人们的广泛关注。文章描述了在40 km单模光纤上采用 IM/DD(强度调制/直接检测)和 OFDM(正交频分复用)技术的40 Gbit/s 光传输系统的设计,实验中使用的是10 Gbit/s级别的 EML(电吸收调制激光器)和 APD(雪崩光电二极管)。通过 MATLAB编程软件实现相关算法,利用 VPI仿真软件对系统进行仿真,并对实验结果进行了分析,验证了 OFDM技术在未来低成本高速率的光传输网络中应用的可行性。     

基于直接控制光纤长度的RoF系统色散管理

基于色散引起的双边带调制信号周期性功率衰落,提出了一种直接控制光纤长度来避免光纤色度色散对接收信号功率影响的新方法.从理论上证明了这个方法的可行性,并通过仿真分析比较了四种色散管理的方法,仿真结果表明,与其他三种方法相比,提出的直接控制光纤长度的方法不仅改善效果显著而且对光源中心频率和调制频率波动并不敏感,是解决WDM...     

非匀速平飞模式下双基地SAR成像分析

该文研究了收发平台非匀速平飞模式下的双基地SAR成像问题。首先构建收发非匀速平飞模式的几何场景,并通过对回波瞬时收发距离的分析得到了双基地SAR回波的近似模型。收发平台速度变化使得波束不同步,导致SAR数据在方位向非均匀采样,该文首先分析了将非匀速平飞双基地模型等效成单基地变速运动模型的方法,然后采用非均匀傅里叶变换处理变速运动引起的非均匀采样的问题。多组不同条件下的仿真实验表明双基地SAR图像质量较好,验证了该文方法的有效性。     

差分LC滤波器在通信电路中的设计和应用

差分信号在无线通信系统链路中应用越来越广泛,模拟的差分LC滤波器可以有效抑制射中频电路中的带外谐波和噪声等无用信号。文章提出差分LC滤波器设计途径和单端LC滤波器简单的转换关系,介绍了射中频差分LC滤波器在无线通信系统中的一些应用问题。