This book describes circuit engineering efforts for modern mobile communication. Electronic circuits for latest mass applications like mobile phones and smart phones are realized as so-called systems on chip (SoC). Such SoCs are realized in nanometer CMOS technology and contain a lot of digital circuits for digital signal processing but they also contain analog circuits which often form the key devices for a good over-all performance. The importance of analog filters nowadays is often underestimated. They are, however, still necessary to obtain high-performance wireless receivers and transmitters. In fact, progress in CMOS technology and circuit design allows the revolution in modern mobile communication. Every ten years, a new mobile phone generation is introduced. Recently, LTE (Long Term Evolution) was started by telecom companies to form the 4th generation of mobile phones. Up to 100 Mbit/s are possible with LTE for downloads, which is a much higher data rate than with HSPA+.

关键词：移动通信；电子电路；数字信号；无线接收机

查看摘要 索取原文[174页]

An FSS is a type of satellite service that uses geosynchronous satellites for broadcasting TV and radio programs, telecommunications, and satellite communication. This service is mainly used by government organizations, the media, and network operators.

关键词：亚太地区；地球同步卫星；FSS；卫星服务

查看摘要 索取原文[66页]

In this chapter, we propose an adaptive equalization scheme for a chaos-based digital communication system. The studied system is a discrete-time version of the one proposed by Wu and Chua that has recently been considered for optical applications. Due to the nonlinear characteristics of the transmitters and receivers and the lack of robustness of chaos synchronization, even minor channel imperfections are enough to hinder communication. Adaptive equalization is succinctly reviewed by focusing on the normalized least-mean-squares (NLMS) algorithm, which is extended to fit the studied chaotic communication system. Simulation results show that the proposed chaotic NLMS can successfully equalize the channel.

关键词：数字通信系统；自适应；混沌通信

查看摘要 索取原文[25页]

The objective of this project was to create a real-time, context-aware transit navigation system. The system integrates the route-planning and real-time tracking functionality provided by current systems into a single, real-time and context-aware application, combining a smartphone end-user device, such as the Apple iPhone, with a sophisticated back-end service. The completed navigation system supports unified real-time transit navigation, including walking, biking or handicapped access, across all three Chicago transit agencies: CTA buses and subway trains, Pace suburban buses, and Metra commuter rail. The back-end is built as a generic routing service, which can be used by any number of client applications. On the client side, an iPhone application has been created, with an attractive user interface and a wide selection of convenient features. The iPhone application has been published on the iTunes App store for public download. The app is downloaded by approx. 2,0003,000 users per month, and has received over 1,000 reviews, many of which are very positive

关键词：通讯设备;通勤铁路;导航系统;公共交通

查看摘要 索取原文[13页]

This thesis explores a novel network design concept to address the data and communications needs of the Department of Defense (DoD). Current and future military operations are increasingly reliant upon data connectivity to facilitate situational awareness and distribute vital information. Current infrastructures are insufficient to meet the growing demand, especially in the myriad austere environments where military forces operate. The DoD has become reliant upon increasingly vulnerable and expensive satellite communications to fill those gaps. The wireless data technologies utilized in the commercial sector to meet the data distribution requirements of business and commercial telecommunications providers can be leveraged and adapted to meet the connectivity requirements of the DoD. By pairing these technologies with developing HAPs and their capabilities the potential for a long-range wireless broadband solution emerges. This thesis evaluates broadband wireless data technologies in combination with High Altitude Platform (HAP) technologies. It proposes a network design concept to serve as a model for future research and the ultimate integration of HAPs into battlefield information architectures bringing the concepts of network centric warfare ever closer to reality.

关键词：无线计算机网络；宽带；通信和广播系统；数据处理;

查看摘要 索取原文[115页]

High performance for numerical linear algebra often comes at the expense of stability. Computing the LU decomposition of a matrix via Gaussian Elimination can be organized so that the computation involves regular and efficient data access. However, maintaining numerical stability via partial pivoting involves row interchanges that lead to inefficient data access patterns. To optimize communication efficiency throughout the memory hierarchy we confront two seemingly contradictory requirements: partial pivoting is efficient with column-major layout, whereas a recursive layout is optimal for the rest of the computation. We resolve this by introducing a shape morphing procedure that dynamically matches the layout to the computation throughout the algorithm, and show that Gaussian Elimination with partial pivoting can be performed in a communication efficient and cache-oblivious way. Our technique extends to QR decomposition, where computing Householder vectors prefers a different data layout than the rest of the computation.

关键词：算法;高斯消元法;线性代数;数值分析;通信

查看摘要 索取原文[19页]

This research grant provided the opportunity to research and deploy beneficial transportation technologies to support transit needs. Working with the Transit Authority of Northern Kentucky (TANK), solutions were developed that can apply to transit agencies and emergency management across the country. As a result of this research, technologies were developed and deployed to Wi-Fi-enable buses, send video content to buses in transit, send riders service alerts via email and text, visualize the cost and environmental advantages of public transit, and provide location aware trip planning and other informational services via the Web, desktop gadgets, mobile apps, text messages, and kiosks.

关键词：信息系统;公共交通;物流;安全;公交车;电子信箱;应急管理;

查看摘要 索取原文[84页]

Consider a network of n processes each of which has a d-dimensional vector of reals as its input. Each process can communicate directly with all the processes in the system thus the communication network is a complete graph. All the communication channels are reliable and FIFO (first-in-first-out). The problem of Byzantine vector consensus (BVC) requires agreement on a d- dimensional vector that is in the convex hull of the d-dimensional input vectors at the non-faulty processes. We obtain the following results for Byzantine vector consensus in complete graphs while tolerating up to f Byzantine failures: * We prove that in a synchronous system, n > or = max(3f+1; (d+1)f+1) is necessary and sufficient for achieving Byzantine vector consensus. * In an asynchronous system, it is known that exact consensus is impossible in presence of faulty processes. For an asynchronous system, we prove that n > or = (d+2)f+1 is necessary and sufficient to achieve approximate Byzantine vector consensus. Our sufficiency proofs are constructive. We show sufficiency by providing explicit algorithms that solve exact BVC in synchronous systems, and approximate BVC in asynchronous systems. We also obtain tight bounds on the number of processes for achieving BVC using algorithms that are restricted to a simpler communication pattern.

关键词：拜占庭矢量共识;分布式计算;图;网络;矢量分析

查看摘要 索取原文[21页]

The vehicle terminal is part of the vehicle monitoring system,this article introduces ARM 9 and Bei Dou navigation and communication system which consisting of vehicle terminal system,which offers a method not only could combines Bei Dou communication,GPRS communication,Ethernet communication but also provides the multi-channel data acquisition,this method could ensure that the information transmission in the abnormal situations,and also could give full play to a variety of channels,use of resources,improve efficiency,reduce communication costs,and has great application prospects.

关键词：车载终端;多通道;斗;基于ARM9;在GPRS

查看摘要 索取原文[5页]

One of the long-term goals of this project is to analyze and propose energy-efficient communication techniques for underwater acoustic sensor networks. These techniques aim at consuming as less energy as possible as well as guaranteeing a minimum quality of service. In order to do so, we assume and validate some statistics of the underwater acoustic channels and derive stochastic optimal transmission policies. Another long-term goal of this project is to investigate the possibility that these underwater acoustic networks disrupt the behavior of surrounding species of marine mammals. As a consequence of these two studies, we aim at developing minimally disruptive communication schemes.

关键词：海洋;随机过程;水下声学;水下通信

查看摘要 索取原文[6页]