【作者】 王瑜；

【导师】 续大我；

【作者基本信息】 北京邮电大学 ， 信号与信息处理， 2008， 硕士

【摘要】 TD-SCDMA系统是由中国电信科学技术研究院(CATT)在1998年代表中国提出,并在2000年5月得到ITU通过,成为第三代移动通信系统无线通信标准之一。TD-SCDMA采用了一系列的关键技术,包括TDD时分双工、同步CDMA、智能天线、联合检测、软件无线电、接力切换、动态信道分配等等。TD-SCDMA系统因此有很多领先的优势:不需要配对的频谱带宽、灵活的帧结构、适合非对称业务,更高的理论频谱效率以及采用智能天线和TDD技术的低成本基础设施等。本文首先介绍了当前第三代移动通信系统中的几大主流技术标准——WCDMA、CDMA2000、TD-SCDMA以及2007年10月刚刚通过ITU投票的WiMAX。然后简单描述了TD-SCDMA的物理层结构,根据3GPP LCR TDD的物理层规范,给出TD-SCDMA的物理层仿真平台的系统框图,并具体描述了其中传输信道的复用和信道编码处理部分的仿真实现,包括信道编码、传输复用、卷积码和Turbo码、交织、速率匹配等模块的仿真实现。最后给出了TD-SCDMA传输信道处理的仿真实验结果和分析。论文最后还介绍了HSDPA技术原理与关键技术,着重分析了HSDPA在TD-SCDMA系统中的应用。HSDPA技术采用了一些能提高下行信道容量的一些关键技术。在3GPP R5的技术规范中,HSDPA技术采用的关键技术包括HARQ(混合自动重传请求)、AMC(自适应调制编码)和基站快速调度。HSDPA技术是基于一种新的传输信道类型:HS-DSCH(高速下行共享信道),它位于基站并受到MAC-hs实体的控制。基于N频点的多载波HSDPA技术,通过多载波捆绑和最小化改动,可以有效的提高TD-SCDMA的HSDPA峰值速率和小区数据吞吐量。更多还原

【Abstract】 TD-SCDMA was proposed in 1998 on behalf of China by CATT (Chinese Academy of Telecommunication Technology), and approved by ITU (International Telecommunications Union) as one of the international CDMA standards for 3G mobile communications in May 2000. TD-SCDMA adopts a series of techniques, such as TDD, synchronous CDMA, smart antenna, joint detection, software radio, baton handover, dynamical channel allocation, and so on. Its expected advantages are unpaired frequency band, flexible frame structure, suitable for asymmetrical service, higher expected theoretical spectral efficiency, low expected cost of infrastructure by using smart antenna and TDD technology, etc.The paper firstly introduces these international CDMA standards for 3G mobile communications, including WCDMA, CDMA2000, TD-SCDMA and WiMAX approved by ITU in Oct 2007.Then the architecture of TD-SCDMA physical layer is simply described. According to the specifications of 3GPP LCR TDD physical layer, the system framework of TD-SCDMA physical layer simulation platform is issued, and the paper concretely describes the part of transportation channels coding and multiplexing, including the modules of channel coding, transportation multiplexing, convolution codes & Turbo codes, interleaving, rate matching and etc. Lastly, the results of simulation experiment of TD-SCDMA transportation channels disposal is given and analyzed.This paper finally introduces HSDPA theory and key techniques, and then analyzes application of HSDPA technique in TD-SCDMA system. HSDPA is a combination of several key techniques which all contribute to the enhanced capabilities of the downlink channel. 3GPP R5 HSDPA includes HARQ (hybrid automatic request), AMC (adaptive modulation and coding) and NodeB fast scheduling functionality. It relies on a new type of transport channel, the HS-DSCH, which is terminated in the Node B and controlled by MAC-hs. Based on N frequency Cell technique, TD-SCDMA multi-carrier HSDPA, by multi-carrier binding and little alteration, can efficiently improve the peak speed and cell data throughput.更多还原