移动运营商定制终端的研究

随着移动数据业务广泛开展，终端独立发展模式不再适用．运营商定制终端成为趋势。运营商定制终端面临的挑战有：没有能力控制终端销售渠道、难以解决终端应用平台的兼容性、内容应用开发商与终端厂商整合不足、杀手级业务不明确、研定实力不足等。介绍了国外运营商定制手机的做法以及国内运营商定制终端的尝试。     

Performance analysis of an adaptive receiver structure for digital mobile communications

In this paper we investigate the performance of a combined estimation/equalization technique for the mobile radio channel, assuming a GSM-recommended transmission format (narrowband TDMA with midamble, recommendation 5.04) and MSK modulation scheme. Channel estimation is performed via correlation of the received signal with a suitably modulated replica of the transmitted midamble. Equalization is then obtained by means of a maximum likelihood sequence estimation (MLSE) scheme in the form of a so-called Viterbi equalizer. Our analysis provides theoretical results concerning the bit error rate (BER) attained by the receiver for a given stationary multipath channel model. Simulation results are also presented in order to integrate and validate the theory.     

Effects of fade distribution on a mobile satellite down-link and up-link performance in a frequency reuse cellular configuration

In a mobile satellite system with a frequency reuse cellular configuration, significant co-channel interference can be experienced due to the antenna side-lobe level. The signal will be subjected not only to its own fading, but also to the effect of the varying degree of fading on the co-channel interferer, and this interference will behave differently in the up and in the down-link. This paper presents a quantitative evaluation of the combined effects of fades and co-channel interference on a mobile satellite link.     

Validation of mobile LiDAR surveying for measuring pavement layer thicknesses and volumes

Mobile LiDAR surveying is currently one of the most popular topics in road inspections. This non-destructive technology is suitable for collecting infrastructure inspection data related to 3D geometry and radiometry. Ground penetrating radar (GPR) is traditionally used to measure pavement thickness, though this technique requires reference data (cores) when surveying in a ground-coupled configuration.Within this work, a new alternative method to GPR has been studied for determining pavement layer thicknesses and volumes. We analyze the performance of mobile LiDAR technology in this scope and test its accuracy compared to the results obtained with a ground-coupled 2.3-GHz GPR antenna. The findings presented here are based on field data collected from the Ourense–Celanova highway, in Northwestern Galicia. The results showed the potential of the Lynx Mobile Mapper to obtain the designed pavement thickness of newly constructed roadways with errors that are always less than 1.5 cm.     

一种基于代理技术的分层入侵监测方法

对现有的入侵监测系统做了一些介绍，提出了一个基于移动代理技术来实现入侵监测系统安全的方法．并对此系统的优缺点做了分析，对研究基于移动代理技术的入侵监测系统有一定的指导作用，最后，简单介绍利用代理实现安全的一些方案。     

手机电视的实现技术研究

本文介绍了“手机电视”业务的两种主要技术实现方式，包括基于移动通信网络的方式和基于数字电视地面广播的方式。然后对这两种实现方式的特点进行了分析和对比，最后提出了在应用层面进行融合的方式。     

Getting to know each other—Artificial social intelligence for autonomous robots

This paper proposes a research direction to study the development of ‘artificial social intelligence’ of autonomous robots which should result in ‘individualized robot societies’. The approach is highly inspired by the ‘social intelligence hypothesis’, derived from the investigation of primate societies, suggesting that primate intelligence originally evolved to solve social problems and was only later extended to problems outside the social domain. We suggest that it might be a general principle in the evolution of intelligence, applicable to both natural and artificial systems. Arguments are presented why the investigation of social intelligence for artifacts is not only an interesting research issue for the study of biological principles, but may be a necessary prerequisite for those scenarios in which autonomous robots are integrated into human societies, interacting and communicating both with humans and with each other. As a starting point to study experimentally the development of robots' ‘social relationships’, the investigation of collection and use of body images by means of imitation is proposed. A specific experimental setup which we use to test the theoretical considerations is described. The paper outlines in what kind of applications and for what kind of robot group structures social intelligence might be advantageous.     

具有多普勒频移校正功能的DQPSK调制解调器

本文介绍了一种适合于卫星移动通信的具有多普勒频移校正功能的ＤＱＰＳＫ调制解调器及其ＤＳＰ实现，给出了多普勒频移校正方法，提出了在大多普勒频移情况下的跟踪滤波器方法。实验测试表明，该调制解调器实现恶化小于１ｄＢ（输出误比特率Ｐｂ＝１×１０－４时，对应的Ｅｂ／ｎ０＝１１．６ｄＢ）。多普勒频移在－Ｒｓ／２～Ｒｓ／２内变化时，对Ｐｂ没有影响。多普勒频移速率可达１００Ｈｚ／ｓ，这里Ｒｓ是已调信号的符号速率。     

Steer angle fields: An approach to robust manoeuvring in cluttered, unknown environments

In this paper a simple, robust and efficient method for local obstacle avoidance is described. It takes into account both the geometric and the kinematic properties of the robot in order to calculate allowed and forbidden steer angles.

The algorithm has been implemented and extensively tested on our mobile robot. Results have shown that the robot is able to operate robustly in unknown and uprepared in-door environments for extended periods.