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。     

TD-SCDMA终端射频模块的研制

介绍了应用于第三代移动通信TD-SCDMA标准的移动终端射频模块的设计和实验测试结果。该射频模块具有结构紧凑、体积小、功耗低、兼容性强、易于与基带电路接口等优点。测试结果表明,其各项指标完全满足3GPP规范的相应要求。     

WCDMA移动终端(MT)射频模块的研制

本文介绍了应用于第三代移动通信体制WCDMA移动终端的射频模块设计和实验测试结果，整个射频模块集成设计在6层PCB上，工作电压＋3．3V，结构紧凑，测试结果表明达到了3GPP中射频相关的指标要求，以及国家863计划“第三代移动通信系统研发（C3G）项目”对WCDMAMT系统的性能和功能要求。     

WCDMA移动终端(MT)射频模块的研制

本文介绍了应用于第三代移动通信体制WCDMA移动终端的射频模块设计和实验测试结果,整个射频模块集成设计在6层PCB上,工作电压+3.3V,结构紧凑。测试结果表明达到了3GPP中射频相关的指标要求,以及国家863计划“第三代移动通信系统研发(C3G)项目”对WCDMA MT系统的性能指标和功能要求。     

WCDMA移动终端(MT)射频模块的研制

本文介绍了应用于第三代移动通信体制WCDMA移动终端的射频模块设计和实验测试结果,整个射频模块集成设计在6层PCB上,工作电压 3.3V,结构紧凑.测试结果表明达到了3GPP中射频相关的指标要求,以及国家86 3计划“第三代移动通信系统研发(C3G)项目“对WCDMA MT系统的性能指标和功能要求.     

第三代移动通信技术标准的演进

尽管3G系统的传输速率可高达2Mbit／s，但仍无法满足多媒体通信的需求，存在交换构架不是纯IP方式、多用户干扰使CDMA难以达到很高的通信速率等局限性。因此，3GPP和3GPP2等国际标准化组织开始了3G演进技术标准的制定。演进型3G技术标准的发展已是大势所趋。     

下载Keithley SignalMeister~(TM)射频通信测试工具包软件-3.0版本

Keithley的SignalMeister射频分析软件-3．0版本提供WLAN和WiMAX（包括802．16e Wave2）波形产生和分析能力的SISO和MIMO信号测试及3GPP、3GPP2和DVB波形产生能力。SignalMeister是新一代射频通信测试工具包软件，能够生成并分析最先进的无线通信协议中所采用的复杂信号。     

TD-LTE终端射频一致性检测

综述了TD-LTE终端射频一致性检测方法与指标,在系统研究3GPP相关协议标准,参照国内外测试仪表的功能和性能基础上,提出了TD-LTE终端射频一致性检测系统的软硬件架构。     

WCDMA接收器的主要指标和实施

第三代（3G）移动系统对无线／模拟蜂窝手机前端设计提出了重大挑战，文章阐述了基于第三代合作项目／（3GPP）的3G码分多址（WCDMA）主要射频接收器要求和实施条件，以WCDMA接收器ASIC的测量结果作为主要参数。     

异构网络的构建与小基站的测试需求

通过介绍异构网,引入small cell这一概念,着重论述了small cell在未来LTE网络中的重要性以及由此带来的新挑战。通过对比3GPP标准中相关宏基站与small cell在射频测试当中不同指标的定义,阐述了在测试small cell射频指标性能时所面临的挑战和解决方案。     

cdma2000/sup /spl reg// high rate broadcast packet data air interface design

The Third Generation Partnership Project 2 recently baselined the specification for a cdma2000/sup /spl reg// high-rate broadcast packet data air interface ("cdma2000 High Rate Broadcast-Multicast Packet Data Air Interface Specification", 3GPP2 C.50054). The standard allows high-speed delivery of packet data to multiple access terminals. The article describes the air interface design adopted by 3GPP2, and presents simulation results that predict the performance of the high-speed broadcast system.     

空时码在高速无线通信系统中的应用

介绍了一种有效的信道编码方案-空时码,它不用增加传输带宽就能大幅度提高信道的吞吐量。还对空时码不同分类间的优缺点作了比较,并提出了下一步研究的方向。由于空时码具有很高的频谱利用率,所以最近有一种叫空时扩频(space-timespreading)已经作为cdma2000(3GPP2)的一种候选传输方案,还有另一种空时发射分集(STTD)也被引入到UMTSW-CDMA标准(3GPP1)中,而且它还有可能在4G中和未来无线局域网中得到广泛的应用。     

UMTS/IMT-2000 based on wideband CDMA

The UMTS terrestrial radio access is based on wideband 4.096 Mchip/s DS-CDMA technology. UTRA will be connected to an evolved GSM core network for both circuit and packet services. A merger between ETSI/Europe and ARIB/Japan based on W-CDMA, a GSM core network, and a common frequency allocation according to the ITU Recommendation of 2 GHz makes a global IMT-2000 standard feasible. UTRA based on W-CDMA fully supports the UMTS/IMT-2000 requirements (e.g., support of 384 kb/s for wide-area coverage and 2 Mb/s for local coverage). Furthermore, the air interface has flexible support of mixed services, variable-rate services, and an efficient packet mode. Key W-CDMA features also include improved basic capacity/coverage performance compared to second-generation systems, full support of adaptive antenna arrays, support of hierarchical cell structures with interfrequency handover, and support of asynchronous inter-base-station operation. There have been no constraints due to the strong requirements for backward compatibility with second-generation systems. This has facilitated a high degree of flexibility and a future-proof air interface. Extensive evaluations by means of simulations and field trials have been carried out by a number of companies, and full system tests are ongoing. Consequently, W-CDMA technology can now be regarded as a mature technology, ready to provide the basis for UMTS/IMT-2000     

Reverse high-speed packet data physical layer enhancements in cdma2000 1/spl times/EV-DV

The rapid growth of Internet-based applications calls for design of a high-speed wireless packet data communication system. This anticipated increase in future mobile wireless packet data services has challenged the current 3G standardization bodies to respond with evolved 3G system specifications capable of providing increased data throughput. In response to such a need, 3GPP2 recently completed the enhanced reverse link standardization effort of the CDMA technology flagship, cdma2000/spl reg/ by completing the definition of the 1/spl times/EV-DV 1/spl times/ system. 1/spl times/EV-DV achieves higher data throughput while simultaneously providing coexisting and backward-compatible voice services within the same spectrum. This feature of 1/spl times/EV-DV allows wireless operators to manage the voice and data loading in their system more efficiently. This article describes the physical layer reverse link enhancements in cdma2000 revision D that are necessary to support 1/spl times/EV-DV.     

AMR语音编码技术在多环境下的性能分析及优化

自适应多速率语音编码是3GPP制定的主要应用于第三代移动通信W—CDMA系统中的语音压缩编码，当无线环境中的信道质量发生改变时，能通过自适应地改变语音编码方式对其进行差错纠正和保护。对比了传统GSM与AMR2种编码技术，对其在不同环境下的部分性能进行测试并分析结果；结合现有AMR算法原理，提出了一种有效降低运算量的代数码本快速搜索的方法，最后对其结果进行仿真验证。     

第三代移动通信技术的现状和展望

本文首先分析了第三代移动通信未来的业务和市场。回顾了第三代移动通信协议的标准化进程,分析了几种主流的第三代移动通信技术的特点和优势,特别分析了第三代移动通信标准化工作的最新内容和未来移动通信的可能发展方向,最后介绍了中国移动通信设备商在第三代移动通信设备研制和生产上的进展。     

Standardization of femtocells in 3GPP2 - [femtocell wireless communications]

Driven by the need for multivendor interoperability of femtocell devices and their supporting infrastructure equipment, the cdma2000reg standards community has been undertaking a large-scale and comprehensive effort to develop industry standards for femtocell devices and systems based on the cdma2000 family of radio access technologies. This article describes those standardization activities and provides an overview of the femtocell system architecture that has been developed within 3GPP2.     

Recent advances on TD-SCDMA in China

China has fully embraced the remarkable growth and unprecedented penetration of mobile services, and has become the world's largest mobile cellular market. TD-SCDMA was proposed by the China Wireless Technology Standard (CWTS) Group in 1998, approved as one of the 3G standards by ITU in May 2000, and joined 3GPP in March 2001. This has been a major effort by China to advance its mobile communication systems and facilitate its own technological development in this critical area. TD-SCDMA, a combination of TDD and synchronous CDMA, offers several unique advantages over its alternatives, WCDMA and cdma2000, such as flexible spectrum allocation, low-cost implementation, and easier migration from GSM systems. This article reviews the development, key technical features, and deployment of TD-SCDMA in China.     

cdma2000的全IP网络体系结构

本在3GPP2最新研究成果的基础上，从整体上对3GPP2的全IP网络体系结构模型进行了描述。章首先介绍了目前我国对cdma2000进行研究的必要性，以及国际上研究cdma2000标准的概况，然后介绍了网络模型中的一个重要部分——“传统移动终端域”(Legacy Mobile Station Do-main,LMSD)，给出了cdma2000的全IP网络模型图，并逐一介绍了其中的重要网络实体，最后从不同的平面和视角，对网络实体之间的关系进行了进一步勾画。