| 1. | Three wideband access schemes of wire , wireless and satellite based are defined in different communication conditions on the operating environment
根据现场不同的通信条件确定了有线、无线、卫星三种不同的宽带接入技术方案。 |
| 2. | The design of the access equipments is implemented for the different access schemes . it achieves mainly the functions of collecting , dealing and passing various services
重点针对三种不同的接入方案完成了相应接入设备的配置，其主要完成现场各类业务的采集、处理及上传功能。 |
| 3. | An action group headed by the planning , environment and lands bureau will be set up to identify areas of the city which are badly affected by street level pollution that could benefit from pedestrianisation or restricted access schemes
一个由规划环境地政局统筹的行动小组将会成立，找出深受路旁空气污染问题影响的地区，并在这些地区设立行人专用区或限制车辆驶入。 |
| 4. | On considering the influence of parameters such as rtsjthreshold , packet error rate , i analyze the performance of csma / ca in basic access scheme as well as rts / cts scheme . by successfully simulated the functions of 802
通过对站点接入概率的分析，本文系统的分析了csma ca基本接入机制和rts cts接入机制的性能，并考虑了rts _ threshold参数、信道误码率对性能的影响。 |
| 5. | An action group headed by the planning , environment and lands bureau will be set up to identify areas of the city which are badly affected by street level pollution that could benefit from pedestrianisation or restricted access schemes
一个由规划环境地政局统筹的行动小组将会成立，找出深受路旁空气污染问题影响的地区，并在这些地区设立行人专用区或限制车辆驶入。 |
| 6. | Providing a novel access scheme for solving “ last mile ” wideband access and global person communications . in wireless optical code multiple access ( w - ocdma ) network , media access control ( mac ) is a key issue , which determines network performance 、 bandwidth efficiency 、 complexity and cost of terminal
无线光码分多址( w - ocdma )接入网中,数据链路层的媒质接入控制技术( mac )至关重要,它直接影响网络的性能、带宽利用效率、终端设备的复杂度和成本。 |
| 7. | With the trend that cdma will be the dominant multi - access scheme in the new generation of wireless communication , how to apply spatial processing in cdma system has been becoming the emphasis of research in smart antenna . a proper method is space - time processing due to the space - time structure of wireless channel . beamforming can be combined with rake to form 2d rake receiver , which can effectively weaken the enhancement of mai in conventional rake receiver . however a more effective method is to use space - time filtering . these two scheme will be discussed and the structure and realization will be presented
码分多址技术逐渐成为新一代通信系统的主流多址技术,如何在码分多址系统中引入空域处理以改善系统性能是当前智能天线技术研究的重点之一.考虑到无线信道的时空二维结构特征,一种合理的实现方式是采用时空处理方法,将波束形成技术与时域分集技术相结合;另一种更有效的方法是在接收端采用时空二维联合处理,对无线信道进行时空二维均衡 |
| 8. | Capacity and performance of mobile radio systems essentially depend on the choice of the multiple access scheme . a novel and promising wireless digital modulation / multiple access technique called multicarrier cdma is studied in this thesis , including reducing the peak - to - average ratio , which is one of its key techniques . mc - cdma is combination of ofdm and cdma , thus advantages of both techniques are exploited
移动通信系统的容量和性能在很大程度上取决于多址方案的选择，本文主要讨论了在通信领域新兴的扩频多址方式一多载波cdma ( mc - cdma ) ，并对降低mc - cdma系统峰值平均功率比这一关键技术进行了研究。 |
| 9. | While some organizations abroad has started research on this area and can surport broad band access scheme and devices , some demestic institution and company just start research and do not have corresponding solution . under this condition , we started our research , including key technologies research of gpon and system framework research of gpon
国外已经开始这方面的研究,并且已有少数公司可以提供基于gpon的宽带接入方案和设备,而在国内对gpon的研究还刚刚开始,主要集中在一些关键技术上,还没有成熟的解决方案。 |
| 10. | In this paper , we study the performance of input - buffered atm switching with window - access scheme and output - grouping architecture . the close - form formulae of maximum switch throughput , mean cell delay and cell loss probability are obtained by probability generating function approach . the accuracy of theoretical analysis is verified by computer simulations and results show that the maximum switching throughput will reach 99 % under random uniform traffic when the window size and the group size are 4 and 16 respectively
本文提出了具有组合的窗口接入和线群输出结构的输入缓冲atm交换网络并对其性能进行了研究.通过概率生成函数方法得到了计算该交换网络最大吞吐率，平均信元时延和信元丢失率的封闭表达式，并通过计算机模拟实验验证了理论分析的精确性.研究结果表明，在随机均匀业务下，当窗口尺寸和输出群尺寸分别为4和16时，最大吞吐率可达到99 |
