【作者】 骆纯；

【导师】 李平安；

【作者基本信息】 武汉理工大学 ， 通信与信息系统， 2010， 硕士

【摘要】 为了满足ITU为IMT-Advanced系统提出的性能指标,3GPP提出了LTE-Advanced技术。针对LTE系统中小区间干扰比较严重,已有的干扰协调技术不能很好的解决边缘用户频谱效率低的问题,在LTE-Advanced中引入协同多点传输和接收(Coordinated Multi-Point transmission/reception, CoMP)技术来解决此问题。该技术通过多个小区之间的联合调度或协作传输,降低邻区干扰,提高用户接收信号质量,从而有效提高系统容量和边缘用户频谱效率。本论文主要工作是针对CoMP中的协同传输技术(Joint Processing, JP)进行研究,以该技术方案为基础,利用系统级仿真,对CoMP JP方案及其性能进行了研究和评估验证。主要贡献包括以下方面：(1)根据3GPP标准会议提案和系统仿真方法,结合3GPP TR36.814中的场景假设,设计并搭建了CoMP JP的动态系统仿真平台。平台包括：多小区空间信道建模、协同小区簇划分、协同用户及协同小区集合确定、调度、预编码、干扰计算及终端接收机等功能模块。基于平台,评估了3GPP Case1场景下单用户JP和多用户JP的性能。(2)针对传统单小区调度算法不能满足CoMP多小区协同传输的问题,提出了应用于JP系统的集中式多小区协同调度算法及调度器实现,提出多用户系统下的配对算法及改进算法,并对算法进行了评估和分析。(3)针对协同处理的联合预编码需求,提出了不同的物理层信道合并方案,并对各种方案进行了仿真评估及分析。(4)基于以上仿真平台及算法实现,评估了理想信道估计条件下,单用户系统与多用户系统的性能,并对部分非理想因素对系统性能的影响进行了分析。更多还原

【Abstract】 3 GPP brought forward the LTE-Advanced techniques to meet the performance guideline, which ITU proposed for IMT-Advanced system. Since the interference between cells in LTE system is so severe that the existing interference coordination mechanisms fail to resolve the low spectrum efficiency problem of the tail users, LTE-A introduced the Coordinated Multi-Point transmission/reception (CoMP) scheme to cope with the problem. COMP shall benefit the system capacity and increase the spectrum efficiency of the tail users by employing the joint schedule and coordinated transmission, which could depress the adjacent cell interference and improve the signal quality of the user.This thesis shall mainly study the Joint Processing (JP) technique of COMP. The author’s work focus on the performance evaluation and verification of the COMP JP schemes by the system level simulations. The contributions are presented as follow:The author built the CoMP JP dynamic system simulation platform according to the methodology in the 3GPP standard conference specification, which is mainly based on the scenario assumption in the Technique Specification 36.814. And the platform consists of:spatial channel modeling of multi-cell, coordinated cell cluster division, identification of coordinated users and cell aggregation, schedule, pre-coding, interference calculation, terminal receiver and etc. The evaluation includes the JP system of single user and multi-user in the 3GPP Case 1 scenario.The traditional single cell schedule algorithm cannot be applied to the CoMP multi-cell coordinated transmission. Hence the author proposes a centralized multi-cell coordinated schedule algorithm, and the corresponding scheduler implement as well. The algorithm primarily formulates the partnership method and the corresponding updated method. Moreover, the validity of the algorithms is demonstrated by the numerical results and analysis.This thesis also provides several different physical layer channel combination schemes to meet the requirement of the coordinated processing joint pre-coding. And the corresponding simulation results and analysis are given as well.The single user and multi-user system performance is evaluated based on the simulation platform and algorithms mentioned above in the assumption of ideal channel estimation. And at the same time the impacts to the system performance that may be caused by some nonideal factors are analyzed.更多还原