Distributed Power Control for Energy Conservation in Hybrid Cellular Network with Device-to-Device Communication

Device-to-Device （D2D） com- munication has been proposed as a promising implementation of green communication to benefit the existed cellular network. In order to limit cross-tier interference while explore the gain of short-range communication, we devise a series of distributed power control （DPC） schemes for energy conservation （EC） and enhancement of radio resource utilization in the hybrid system. Firstly, a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint. Then, biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system. Upon feasibility, a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency （SE）. The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.     

水下光声混合网络评价(英文)

The deployment of underwater networks allows researchers to collect explorative and monitoring data on underwater ecosystems.The acoustic medium has been widely adopted in current research and commercial uses,while the optical medium remains experimental only.According to our survey onthe properties of acoustic and optical communicationsand preliminary simulation results have shown significant trade-offs between bandwidth,propagation delay,power consumption,and effective communication range.We propose a hybrid solution that combines the use of acoustic and optical communication in order to overcome the bandwidth limitation of the acoustic channel by enabling optical communicationwith the help of acoustic-assisted alignment between optical transmitters and receivers.     

在具有点到点通信的蜂窝网络中面向节能的分布式功率控制(英文)

Device-to-Device(D2D) communication has been proposed as a promising implementation of green communication to benefit the existed cellular network.In order to limit cross-tier interference while explore the gain of short-range communication,we devise a series of distributed power control(DPC) schemes for energy conservation(EC)and enhancement of radio resource utilization in the hybrid system.Firstly,a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint.Then,biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system.Upon feasibility,a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency(SE).The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.     

陕甘宁边区的科普及其影响

科技普及是中国共产党建设陕甘宁边区的重要措施。边区科普坚持了科学为战争服务的原则,提出"科学的方法应该与科学的任务一致",理论与实践一致的理论。实践中重视干部和技术人员培养,重视群众教育,重视用科学解决群众迫切需要的问题,制定许多政策法规。建立科学机构,积极宣传报道科技,举办展览会。发动干部深入基层,用科技解决问题,取得了良好效果,巩固了边区,使群众和党紧密团结,为后来的胜利奠定了基础。陕甘宁边区的科普理论与实践对新中国的科普产生了重大历史影响。     

卢作孚的科学教育思想与实践探析

卢作孚是我国近代著名的爱国实业家。纵观卢作孚的一生,可以发现他也是一位功勋卓著的教育家和科学传播者。在现有文献资料的基础上,分析了卢作孚科学教育思想的形成,归纳了卢作孚科学教育内容和实践,并从这两个方面出发,对卢作孚科学教育思想进行了评价。     

卫星通信中连续相位QPSK调制的带宽效率分析

连续相位调制(CPM)是一种带宽效率很高的调制技术,适用于卫星非线性信道。在将正交相移键控(QPSK)表示成CPM的基础上,提出了一种基于离散傅里叶变换(DFT)的谱密度计算公式。利用MATLAB的快速傅里叶变换(FFT)运算仿真了连续相位QPSK(CPQPSK)的功率谱,结果表明CPQPSK较QPSK具有更高的带宽效率。     

基于电力线载波通信的智能调光系统设计

针对家用照明灯具远程测控系统的可靠性和经济性问题,设计了一套基于电力线载波通信的家居智能调光系统.整个系统以S3C6410智能网关为核心,内嵌Web服务器,结合GPRS/WIFI网络和电力线载波通信技术,实现了对室内LED灯具的调光控制、情景设置和定时开关等功能.介绍了该系统的总体设计方案、软硬件实现方法.测试结果表明,系统能够满足家居等对实时性要求不高的场合.系统结构简便、通信稳定、易于扩展.     

基于MSP430F169的水声遥控发射系统设计

随着水声通信技术的快速发展,水声遥控系统也已投入使用,它在水下通信、遥测及水下航行器的控制等方面有着广阔的应用前景.该设计基于微功耗单片机MSP430F169作为处理器设计路以便实现不同频率信号的产生、选择及显示,并选用D类功放对所产生的信号进行功率放大.系统软件根据所设计的电路进行移频编程,根据MFSK调制的基本原理,通过采用添加保护时间抵抗码间干扰的编码方案,完成不同遥控信号的产生、控制及显示.     

面向工程建设决策的移动话务量预测研究

随着通信网应用和规模的不断增加,新一代的网络建设规模对业务量的预测也提出了新的需求,其中通信话务量的预测分析已经成为其中非常重要的一部分。准确的话务量预测对网络管理、规划和设计具有重要意义。文章旨在对移动网络中的话务量随时间或事件变化的特性进行分析研究,建立合理科学的话务模型,并采用综合的预测方法进行预测研究。从而辅助通信运营商实时把握用户的行为习惯和话务量的发展趋势,并进行合理决策和投资。     

基于网络行为特征的隐蔽通信模型研究

隐蔽通信技术是信息隐藏技术在通信保密领域的重要应用,是近年来信息安全领域研究的热点之一。文章提出一种基于网络行为特征的隐蔽通信模型,首先通过主机的网络行为特征判定两者之间通信最频繁通信特征,而后将秘密信息嵌入到多媒体载体中,最后将携带秘密信息的多媒体根据通信特征发送到接收方完成隐蔽通信。实验结果表明,该模型不仅能够将隐蔽通信行为掩盖于主机间正常的通信行为中,而且还可以提供较高的通信安全性。