WCDMA无线网络规划中的扰码规划问题

详细介绍了WCDMA无线网络规划中的扰码规划问题，并与GSM系统中的频率规划、CDMA系统中的PN码规划进行了比较分析。     

Capacity and Coverage Tradeoff in WCDMA Environments with Repeaters Deployment

This work derives the analytic expression of the feasibility condition for the uplink of a WCDMA mobile communications system with repeaters deployment in a multiservice environment with a general heterogeneous layout. In particular, a compact closed expression for the admission region is presented, suitable for a system where the users belong to an arbitrary number of different service classes. A tradeoff between capacity and coverage arises and it has been analysed both theoretically and by means of simulations. Different parameters are shown to have a major impact and their adjustment is discussed.     

中国3G市场调研

文章是针对目前中国3G的建设及市场需求进行分析,通过对3G发展的简介到目前中国三大营运商对3G建设的投入状况详细总结。概述了3G建网历次招标的情况及相关受益的设备厂商,并对中国3G带来的PCB行业机遇及挑战进行了分析。     

Femto业务传输QoS保障研究

Femto是主要面向家庭客户应用的家庭基站设备。如何保障Femto业务的QoS,尤其是语音和视频电话实时性业务的QoS,成为运营商和家庭客户越来越关心的问题。本文在深入研究Femto的网络架构的基础上,提出了Femto业务传输QoS保障的方案。     

WCDMA室内覆盖系统设计与实现

在阐述室内覆盖系统原理和组成的基础上,分析了WCDMA室内覆盖系统的信源选取和信号覆盖方式,对在已有2G覆盖的基础上进行WCDMA室内分布系统的布设问题进行了讨论.提出了WCDMA室内覆盖系统的一种设计方案,对方案的各方面进行了详细的分析计算,满足了3G网络对室内信号覆盖的要求.     

WCDMA无线直放站的Σ-Δ小数分频锁相环设计

根据WCDMA无线直放站锁相环的特点,结合Σ-Δ调制小数分频锁相环 噪声低、分辨率高、步进小的优点,给出了一种适用于WCDMA无线直放站的基于Σ-Δ调制小 数分频锁相环,并采用ADS工具对系统进行了仿真。仿真证明了基于Σ-Δ调制小数分频的WC DM A无线直放站锁相环模型的正确性,对WCDMA无线直放站锁相环设计有一定的指导意义。     

一种WCDMA系统下行信道频偏估计算法及其性能分析

文章在深入研究WCDMA下行链路的信道结构及接收信号处理流程基础上,提出了一种在Rake接收机中,通过对P-CPICH（主公共导频信道）序列两次相关检测实现频偏估计的算法;同时,对该算法主要性能指标进行了分析及仿真,验证了算法的可行性。     

Performance analysis of 3G systems in presence of UWB interference

In this paper,the impact of the interference from multiple ultra wideband(UWB) transmitters to a 3rd-generation(3G) terminal is evaluated under UWB emission power limit regulations of federal communications commission(FCC),european telecommunications standards institute(ETSI) and Japan respectively.A three-dimensional interference model is presented where a discrete spatial distribution of UWB transmitters is considered.It is assumed that a mobile terminal and a large number of UWB devices exist in one room simultaneously.A parameter which characterizes the link budget degradation at the victim receiver is defined to measure the UWB interference to 3G systems.The maximum acceptable density of UWB transmitters and the minimum acceptable distance between UWB transmitters and the 3G terminal are analyzed under different link budget degradations.The simulation results demonstrate that the performance of time division-synchronous code division multiple access(TD-SCDMA) is the best,the one of code division multiple access 2000(CDMA2000) is the worst and the one of wideband code division multiple access(WCDMA) lies between them in presence of UWB interference.     

WCDMA终端无线资源管理中的切换测试

RRM（无线资源管理）对WCDMA系统及其终端设备至关重要,其涉及的内容直接关系到WCDMA终端在网络中的表现。文章重点介绍WCDMA终端RRM中切换部分的关键指标,并针对3GPP规范中切换部分的要求及测试方法进行阐述。     

WCDMA网络IP化的传输应对策略研究

文章阐述TWCDMA网络IP承载对传输网的Qos需求，详细分析了运营商的几种应对方案的优缺点，最后提出了承载网IP化急需解决的问题以及后期将采用的技术PTN。