基于QPSO算法的信道分配方法

由于传统的信道分配方法存在频率利用率低下和处理速度慢的缺点,为此,提出基于量子计算的PSO算法（QPSO）来快速实现信道最优化分配方法。这种优化方法利用了量子计算的并行计算能力强、全局收敛、运算速度极快等特点,主要包括初始化代表每个信道的粒子的速度和位置,根据信道分配的教学模型计算保证信道各种约束条件的适应度函数,根据量子粒子群的规律进行粒子位置更新,直至找到最佳信道分配方案等步骤。仿真结果表明其方法是行之有效的,优化效果优于基于遗传算法和PSO算法的信道分配方法。     

Delivering Dependable Telecommunication Services Using Off-the-Shelf System Components

For decades, traditional telecommunication systems have reliably delivered telephony services using expensive equipment and software. In spite of large R&D expenses, the end customer costs remained low due to the amortization of the equipment over a large population of users. With the advent of low cost and high performance computers, it has become conceivable to deliver similar and more powerful services using systems constructed with off-the-shelf components. The only obstacle remaining to make this a reality is the ability of system designers to provide rationable dependability of such systems. This paper illustrates one possible avenue for performing this task and identifies a condition that is necessary for the deployment of such systems, namely the components must in turn provide measures of survivability.     

Estimating the Mean of Heavy-Tailed Distributions

An asymptotically normally distributed estimate for the expected value of a positive random variable with infinite variance is introduced. Its behavior relative to estimation using the sample mean is investigated by simulations. An example of how to apply the estimate to file-size measurements on Internet traffic is also shown.     

The Future – Vision and Challenges (Seen from a Cellular Operator's Perspective)

The current trend within the development of the telecommunication networks indicates that the user will constantly be connected to the network independent on the locations and the covering network. In the following, this is defined as “Always on – everywhere”. Being always on everywhere requires more heterogeneous access networks, more intelligent services and a significant increase in the available capacity in the transmission- and the core network as well as a technology convergence. In the following, we will cover some of the ongoing trends towards a common high capacity infrastructure and what it requires to get there. An overall view will be presented on how the services, their availability, the bit rates and the infrastructure may develop. Most of the examples are seen from a cellular operator's perspective due to the background of the authors. The content of the paper reflects only the view of the authors and not necessarily the one of the TeliaSonera group.     

面向21世纪的中国电信发展

本文介绍了我国电信事业的发展现状，面临的机遇和挑战，以及未来的发展目标。     

通信技术三大跃进和媒体数字化

本文先叙述现代通信技术进展最快的三项 ,即 :硅片集成密度、光纤传输能力、无线通信容量 ,其中特别引人瞩目的是一根光纤的实验传输速率已达 1Tb /s,意味着将使用“奇妙的飞秒”的光脉冲。文中又提到媒体数字化的重要技术 ,这将依靠“朴实的比特”发挥作用。     

短距离光通信用塑料光纤的性能与应用

综述短距离光通信用塑料光纤的材料、制造、性能和应用方面的最新研究成果。     

扩频通信系统性能指标的分析

首先简要介绍了通信系统中接收机灵敏度和系统电平余量的概念，然后着重分析了在不同的扩频通信系统中这两项指标的估算方法，最后总结了各种系统的特点。     

台湾电信的发展现状和未来

本文介绍了台湾近50年来电信市场的变革过程，发展行动电话、通信网络、国际网络、广播电视的情况，无线电频谱的管理机制，以及新世纪头5年由宽带网络建设的主要项目。     

处在十字路口的电信运营者

在知识经济初见端倪和信息劳动保险风起云涌的世纪之交，传统电信运营者正处在重新思考，重新抉择的十字路口。本文从寻找新的增长点，强强联合，走向世界，下一代网和新的计价方法五个方面进行了。