2005年东盟政治经济与电信市场发展情况

在政治趋于稳定、经济持续发展的前提下，东盟电信市场继续稳步推进，不过，东盟各国的电信发展速度存在差异显著，越南、印尼、束埔塞和老挝等电信普及率较低的国家，电信用户的年增速在30％以上，而泰国、新加坡、菲律宾和文莱等电话普及率超过40%的国家，用户年增速已降至10％以内。电信业务的发展也不协调．移动用户的年增量一直远远高于固定用户，不过在小灵通、无绳电话的推动下．2005年出现了移动用户增速放慢、固定用户加快增长的局面。     

宽带接入网网管中的SNMP管理接口技术

随着宽带接入网在我国的广泛应用,宽带接入网的网管系统建设也越来越重要了.分析宽带接入网网络管理中的关键技术,及采用TMN体系结构和SNMP网络管理接口技术的优势,介绍SNMP原理和SNMP网络管理接口的实现过程.     

THE STUDY OF AN M-ARY MC-CDMA SYSTEM BASED ON CYCLIC SPREADING CODES ＆ PRE-EQUALIZATION

A novel fast despreading scheme for M-ary Multi-Carrier Code-Division Multiple Access (MC-CDMA) system is proposed based on cyclic spreading codes and pre-equalizer. In the transmitter, the M spreading codes of each user are generated by circularly shifting the prototype spreading code. A feedback pre-equalizer is employed to process the M-ary MCCDMA signal before transmitted. The received signal is multiplied by the Inverse Discrete Fourier Transform (IDFT) result of the mirror image code of the prototype spreading code, and then demodulated by Orthogonal Frequency-Division Multiplexing (OFDM) demodulator. Compared with the conventional M-ary MC-CDMA receiver, the proposed scheme increases bandwidth efficiency, meanwhile, it achieves M-ary despread spectrum and multi-carrier demodulation, which reduces computation complexity remarkably.     

LCoS背投电视再次考验市场

每一个LCoS技术的竞争者都具有吸引顾客的特点，那么，它能提供的优势是什么呢?     

电视墙系统中的存储器设计

电视墙系统中的存储器设计有多种方案。本文通过比较优选了其中的一种,即一■存储器方案,并详细介绍了具体电路。     

Optimal policies for integrating heterogeneous services on isdn channels

A technique for the classification and evaluation of hierarchical access integration policies of ISDN channels is proposed. The essence of the basic control decisions based on several parameters of the servers and channel is captured in a single priority-based-layered model of multiple queues. We solve for the resulting delay of different policies and investigate the performance in one tractable limit of this model. Using our understanding of the problem parameters and their interaction, we propose a number of heuristic policies for the general model. The results of the general problem complexity investigations suggest the use of simulation models. Problem parameters considered are channel acceptable access delay value, number of servers needed, and flow duration time of a request. Preemptive and non-pre-emptive policies on queued traffic are considered. Performance considers average delay, delay variation and channel utilization. Simulation data on these policies suggest that policies that favour shorter services given better overall delay over a wide range of system parameters. Policies that favour longer and broadband services, on the other hand, show better quality and smaller delay variation.     

一种基于角色的计算机协同CAD系统模型

针对当前协同CAD系统中存在的用户管理混乱、权限划分不明确的现状，本文提出并实现了一种基于角色的计算机协同CAD系统模型。在这个模型中，通过建立“用户／角色／权限”三者之间的映射关系，减小了权限管理的负担和代价，并且有利于系统的后期维护和扩充。     

ATM—success or failure? Economic remarks on the introduction of broadband technology in Europe

The introduction of ATM and broadband-based equipment into the European market requires considerable capital investment. It will result in a structural technological change, affecting the competitiveness of the European economy. Successful introduction depends on how both ATM network equipment and broadband based end-user equipment are brought onto the market. This paper focuses on economic benefits and anticipating marketing strategies, applicable in Europe with its specific, historically evolved structures. The price to pay for this ‘in-sight information’ is leaving out a global comparison. Refraining from evaluation whether conditions are good or bad for Europe or other areas, the article explains what conditions can be found there recently and where are the chances and challenges right now.     

2002年西班牙通信市场综述

西班牙自1998年市场开放以来,通信业显示出强劲的增长势头。但政府干预程度仍较大,为保证市场的稳定性而在某些方面超越欧盟的要求,Telefonica仍占据着市场的主导地位。近期的动向是政府降低移动通信的税收总额,并同监管部门商讨3G基础设施的共享问题。     

小额支付业务智能网实现方案

阐述采用智能网的体系架构实现小额支付业务时的技术方案和网络组织方案。