无线传感器网络的数据存储和索引技术

研究影响无线传感器网络数据存储和查询效率的应用指标,如查询比率和采样频率。对无线传感器网络数据存储方法与各种应用指标的关系进行定量分析和比较,给出各种方法的典型应用场景,为无线传感器网络的数据存储和索引技术设计提供了参考。     

卫星通信系统QOS管理的策略提炼

针对基于策略的DVB—RCS卫星通信系统服务质量管理,提出一种策略提炼模型,结合实例给出目标提炼过程。该模型以线性时态逻辑为基础,在提炼模式的辅助下从高层目标中提取出低层策略,可以有效保证策略提炼过程的正确性、合理性及一致性。在系统设计阶段,该模型用于指导系统功能规划与设计,在系统运行阶段,该模型为网络管理人员提供高层策略向系统设备行为的映射方法。     

航空全双工交换式以太网探究

针对传统航空总线不能满足下一代航空电子系统对高速和实时性数据通信的要求,提出航空全双工交换式以太网（AFDX）。描述AFDX通信网络的特点、结构、通信机制和协议栈,并给出AFDX终端系统和网络交换机的设计思路,阐明硬件结构和软件流程,对AFDX通信网络的研究具有一定的参考和推广价值。     

基于混沌级联的语音频域实时加密系统

针对现有语音实时保密通信系统中系统空载密钥泄漏现象导致容易遭受基于自适应同步控制方法攻击的问题,采用混沌级联对语音频域进行实时加、解密。该方案实现零密钥泄漏,有效抵御了基于自适应同步控制方法的攻击。系统测试分析结果表明,该方案是有效、安全的,优于基于单组混沌系统对时域的加密方法。     

多种通信网络及接口转换模块的研制

针对大系统中共存的多种通信网络和同种网络多种接口互相通信的需要,采用LPC2368SOC结合RTL-RTX实时操作系统,研制一个支持多种通信网络及接口互相转换的模块,实现以太网、串口网、CAN网（现场总线网）和USB之间的通信,以及RS232,RS422和RS485接口之间的通信。从线速上对网络转换速度进行定量分析,指出该模块使用时的极限约束条件。     

Explicit synchronisation of heterogeneous dynamics networks via three-layer communication framework

This paper addresses the explicit synchronisation of heterogeneous dynamics networks via three-layer communication framework. The main contribution is to propose an explicit synchronisation algorithm, in which the synchronisation errors of all the agents are decoupled. By constructing a three-layer node model, the proposed algorithm removes the assumptions that the topology is fixed and the synchronisation process is coupled. By introducing appropriate assumptions, the algorithm leads to a class of explicit synchronisation protocols based on the states of agents in different layers. It is proved in the sense of Lyapunov that, if the dwell time is larger than a threshold, the explicit synchronisation can be achieved for closed-loop heterogeneous dynamics networks under switching topologies. The results are further extended to the cases in which the switching topologies are only frequently but not always connected. Simulation results are presented with four single-link manipulators to verify the theoretical analysis.     

基于跳频和同步捕获技术的水下无线通信技术研究

本文所阐述的水下无线技术即基于跳频技术和同步捕获技术的水声通信,由于声波在海水中的传播特性显著优越于电磁波和可见光,使得水声技术成为海洋高技术的主要研究领域之一 ,在国防领域也具有十分重要的研究意义.本文主要论述了水声通信中跳频技术和同步捕获技术的原理、具体算法的实现方案以及部分硬件设施的使用简述,并通过展示实验结果验证算法的可行性.     

Scheduling gain for frequency-selective Rayleigh-fading channels with application to self-organizing packet scheduling

This paper investigates packet scheduling in the context of Self-Optimizing Networks, and demonstrates how to improve coverage dynamically by adjusting the scheduling strategy. We focus on α-fair schedulers, and we provide methods for calculating the scheduling gain, including several closed form formulas. Scheduling gain is analyzed for different fading models, with a particular focus on the frequency-selective channel. We then propose a coverage-capacity self-optimization algorithm based on α-fair schedulers. A use case illustrates the implementation of the algorithm and simulation results show that important coverage gains are achieved at the expense of very little computing power.     

基于ZigBee技术的远端通信站监控系统及其实现

提出了一种基于ZigBee技术的远端通信站环境监控系统设计方案。包括系统结构、Zigbee通信接口、单片微处理器、温度采集等模块的软硬件设计。此方案设计的监测系统已在某远端无人小型频谱监测站使用。