提高W-CDMA通信系统容量的技术

文章主要讨论了提高W-CDMA通信系统容量采取的技术,包括:小区间异步操作和3步快速小区搜索、引导符号辅助相干信道估计、基于信干功率比的快速发射功率控制、位置分集、前向链路的发射分集,以及干扰抵消和自适应天线阵列分集接收和发射。     

第三代移动通信测试信号源射频模块的研制

针对WCDMA,cdma2000以及TD-SCDMA这三种主流的第三代移动通信标准,研制了测试信号源射频模块。该模块具有集成度高、成本低、配置灵活等特点。文中给出了该模块的设计方案,对各种模式下的射频性能进行了仿真。研究了多种标准下的射频测试方案。最终研制的射频模块尺寸为7.5cm×6cm,测试结果满足3GPP和3GPP2的技术标准。     

W-CDMA Uplink Capacity and Interference Statistics of a Long Tunnel Cigar-shaped Microcells Using the Hybrid Model of Propagation with Imperfect Power Control

The uplink capacity and the interference statistics (mean and variance) of the sectors of the cigar-shaped W-CDMA microcell are studied. A model with eighteen sectors is used to analyze the uplink. The microcells are assumed to exist in a long tunnel with at least nine base stations. The hybrid model of propagation is used in the calculations. The capacity and the interference statistics of the sectors are studied in terms of the most important parameters: sector radius, specific attenuation factor, antenna sidelobe levels, bend losses and the power control standard deviation error.     

WCDMA uplink capacity and interference statistics of highways cigar-shaped microcells

The capacity and the interference statistics (mean value and variance) of the sectors of the cigar-shaped Wideband Code Division Multiple Access microcells are studied. The two-slope propagation model is used in the analysis. A model of five microcells is used to calculate the uplink capacity and interference statistics assuming highways cigar-shaped microcells. The capacity and the interference statistics of the microcell are studied for different sector range, propagation exponent, antenna side lobe levels and different standard deviation of the power control error. It is noticed that the quasi-maximum uplink sector capacity can be got when the sector range R is between 600 and 1,200 m and the sidelobe level of the directive antenna used in each sector is on the order of −15 dB.     

W-CDMA与CDMA2000的分歧与融合

本文对ＩＭＴ－２０００候选建议的两大主流方案Ｗ－ＣＤＭＡ和ＣＤＭＡ２０００的技术特性的相容性以及造成它们之间分歧的主要原因进行了深入探讨,并分析了它们对第三代移动通信无线标准制定的影响。     

第三代移动通信系统无线传输技术的发展

本文简要地介绍了第三代移动通信及其无线传输技术的发展状况。分析比较了当前几种主要的候选无线传输技术，最后对发展我国第三代移动通信提出了几点建议。     

W-CDMA Uplink Practical Capacity and Interference Statistics of Rural Highways Cigar-Shaped Microcells with Imperfect Power Control and Finite Transmitted Power

The capacity and the interference statistics of the sectors of the cigar-shaped W-CDMA microcell are studied. A model of 5 microcells is used to analyze the uplink. The microcells are assumed to exist in rural zones. The capacity and the interference statistics of the microcell are studied for different sector range, different antenna side lobe levels, different values of the break point distance, different values of the propagation parameter s ₂ and different standard deviation of the power control error.     

W-CDMA uplink capacity and interference statistics of cigar-shaped microcells in over-ground train service with imperfect power control and finite transmitted power

The capacity and the interference statistics of the sectors of the shaped Wideband Code Division Multiple Access (W-CDMA) microcells serving over-ground trains are studied. A model of five microcells is used to analyze the uplink. The capacity and the interference statistics of the microcell are studied for different antenna sidelobe levels and different sector ranges. In the study, imperfect power control and limited transmitted power are assumed. The effect of the power assigned to the uplink pilot is taken into account. It is shown that, the sector capacity depends on the train’s position. The uplink sector capacity limits (upper and lower) are presented. The lower capacity limit is given as a function of the sector range and the sidelobe level of the directive antenna used in each sector.     

一种适用于W-CDMA系统的多业务无线资源调度算法

3G系统将以分组交换方式提供语音、数据、视频等具有不同QoS要求的多种业务，资源调度对保证系统服务质量和提高资源利用效率起关键作用．本文提出了一种基于业务类型、当前待发送负荷以及剩余延时限的时间调度策略和基于资源优化的资源调度策略，并使无线链路的传输质量与业务的优先级水平一致．通过系统仿真评价了算法的性能．     

数字电视的数字调制技术

本主要介绍数字有线电视网上、下行信道频谱的划分，各种数字调制方法、性能特点和优缺点比较。