摘要：分析了目前联通CDMA网络建设中的主要问题之一——导频功率分配问题。主要介绍了cdma1x系统的信道类型,以及前向链路信道功率分配原则,并且对导频信道功率与无线网络覆盖和容量之间的关系进行了初步探讨。

摘要：As one of the key characteristics in cognitive wireless networks(CWNs),network environment awareness techniques have received much attention *** of traditional spectrum sensing technology that suffers from problems of miss detection,false alarm,hidden node,and inefficiency,cognitive pilot channel(CPC) technology has been proposed as one of the candidate solutions for an efficient and accurate network information delivery scheme to user equipment(UE).The aim of the CPC technology is to provide the necessary information for the reconfiguration of the UE using the public signaling *** ensure the efficient information delivery,the whole geographical area covered by the CPC is divided into square meshes of the same ***,two typical network information transmission modes for CPC deployment are also proposed:broadcast CPC mode and on-demand CPC *** further improve the efficiency of network information delivery,an efficient dynamic mesh grouping scheme has been designed which is based on the fractal theory for the broadcast CPC mode,where adaptive rectangular sized meshes are used to approximately cover the whole *** to the traditional fixed size mesh division strategy,results show that the proposed dynamic mesh grouping scheme significantly reduces the number of meshes by grouping similar meshes together,and the average delay of receiving CPC information on the UE side is therefore reduced.

摘要：一、CDMA移动通信系统在中国的发展前景及其优化工程设计的必要性 我国拥有世界上最庞大的GSM用户群,并且发展势头惊人,1999年底中国移动用户已突破4300万,装机容量达到8000万线。但由于GSM频率利用率欠佳容量受限,加之世界频率资源紧缺。

摘要：本文首先介绍了作为 cdma2 0 0 0 1 x的增强型 1 x EV- DO的一些优点 ,然后详细地分析了 1 x EV- DO的前向链路结构 ,包括前向导频信道、前向 MAC信道、业务信道以及控制信道 ,并讨论了 1 x EV- DO相对于 IS- 95/1 X在前向信链路结构和技术上的改进。

摘要：文章探讨了CDMA系统中搜索窗的设置原则,并用实例 说明了搜索窗的大小对系统掉话、软切换等性能的影响。