一种基于链路质量的自维护拓扑控制博弈算法

针对无线传感器网络拓扑性能优化单一的问题,本文首先定义了表征双向通信质量的指标.其后将链路质量,节点干扰,剩余能量均衡性等参数融入收益函数,设计了一种基于链路质量的自维护拓扑控制博弈算法SMGLQ.理论证明该算法能保证各节点收敛到帕累托最优.仿真实验表明它能为网络选择通信质量较好的链路,并降低能耗.     

VSAT通信在海洋船舶上的应用研究

VSAT(Very Small Aperture Terminal)即"甚小孔径终端",它是一种微型的卫星通信地球站,是上世纪80年代所研发的卫星通信系统.该系统设备的天线口径极小(0.3~1.4m),且设备结构相当紧凑,拥有固体、智能化属性,在应用环境方面受制范围小,组网相当灵活,所以它在当前的海洋船舶通信方面起着巨大的应用价值.通过研究由它所构成的海洋船舶卫星通信网络及系统,分析VSAT系统链路程序,构建船载VSAT寻星系统将成为本文研究的主要内容.     

基于IPv6测试实验室的设计与实现研究

随着网络技术的发展,IPv4地址的耗尽,惠州城市职业学院在建设传统IPv4实验室的基础上,增加了IPv6测试实验室建设,本文主要研究了惠州城市职业学院的IPv6测试实验室的建设问题,在测试实验室中配置和测试Win2008 Server和win7的IPv6协议。通过本文的研究,完成一系列任务,即可从一个IPv4-only的测试实验网络架构,到混合的IPv4-only和IPv6-capable的架构,到最后IPv6-only的设施。本文IPv6测试实验室的建设将辅助开发ipv6应用程序或把现有程序修改为支持IPv4和IPv6的应用程序。     

A 10 Gb/s receiver with half rate period calibration CDR and CTLE/DFE combiner

This paper presents the design of a 10 Gb/s low power wire-line receiver in the 65 nm CMOS process with 1 V supply voltage.The receiver occupies 300×500/μm2.With the novel half rate period calibration clock data recovery(CDR)circuit,the receiver consumes 52 mW power.The receiver can compensate a wide range of channel loss by combining the low power wideband programmable continuous time linear equalizer(CTLE)and decision feedback equalizer(DFE).     

地基多站无源定位系统通信设计及仿真

对于地基多站无源定位系统而言,为形成协同作战能力,多站间的相互通信是其中的关键设计环节。针对多站无源定位系统的通信需求进行了分析,从通信的带宽、远距离传输以及安全性等多个角度进行了应用设计,并通过仿真测试验证了该设计能够满足需求。     

基于同步的Link-16干扰技术研究

在对Link-16的同步系统进行研究的基础上,提出了通过干扰网络时间基准（NTR）来达到破坏网同步,从而实现Link-16干扰的思路。同时分析讨论了此法下两种特殊干扰的效果,并给出仿真结果。     

基于虚拟分割机制的多服务交换路由器的研究

本文提出了一处基于虚拟分割机制的可编程多服务器由器实现结构：PVSMR，并对它的三个层面的主要构成及其关键技术进行了深入研究。PVSMR基于一种有效而灵活的资源虚拟分割算法，它能够提供与多类应用相适应的、灵活的报文处理和转发控制能力。     

2Mbit/s高速信令链路在移动通信七号信令网中的应用

通过对2Mbit/s高速信令链路原理、特点的介绍，阐明了该技术在现阶段使用的实际意义，并给出了2Mbit/s高速信令链路在移动通信七号信令网中的应用。     

Link adaptation for wireless systems

To improve the robustness and reliability of wireless transmissions, two complementary link adaptation techniques are employed: adaptive modulation and coding (AMC) at the physical layer and hybrid automatic retransmission request (HARQ) at the medium access control layer. Because of their effectiveness in combating errors induced by the wireless channel, AMC and HARQ are now integral components of most emerging broadband wireless system standards, for example, LTE and WiMAX. Spectral efficiency (SE) as measured in bit per second per Hertz is one important parameter used to characterize a wireless system for comparison between different systems or between different configurations of the same system. This work provides a holistic approach of cross‐layer optimizations with the intent of maximizing SE by combining AMC and HARQ. It formulates closed‐form equations for calculating the average SE for wireless systems with the Rayleigh fading channel model. A new online algorithm is developed to optimize SE for both Rayleigh and non‐Rayleigh fading channel. Simulations using proven LTE model are performed to compare SE obtained from closed‐form equations and the developed algorithm for different system configurations. With the developed algorithm to determine how many retransmissions required in addition to the initial transmission in advance depending on the current wireless channel condition, the latency can be reduced up to 24 ms when sending the initial transmission and all of its retransmissions sooner than waiting for retransmission requests as is done previously. Copyright © 2012 John Wiley & Sons, Ltd.     

噪声对消射频光子链路的噪声系数研究

噪声系数是宽带射频光子链路的重要参数,影响射频信号传输和处理系统的信噪比.提出了一种噪声对消射频光子链路,采用平衡光探测器对直流光和调制光转换的光电流相减处理,得到链路的噪声系数改善.从光信号调制、探测及噪声功率变化特性出发,建立了噪声对消射频光子链路的理论模型,并通过理论分析研究了噪声系数与激光功率、相对强度噪声、光...