LTE-A论文：基于有限反馈的LTE-A下行系统码本设计及关键算法研究

1、 LTE-A论文：基于有限反馈的LTE-A下行系统码本设计及关键算法研究【中文摘要】随着第四代移动通信技术的兴起,学术界对LTE-Advanced的研究也不断增长,近年来,基于有限反馈的MIMO增强技术受到很大的关注。3GPP协议指出LTE-A系统下行峰值速率目标为1Gbps。而如此高的下行峰值速率要求LTE-A下行系统的天线数目必须扩展到8根,但目前3GPP LTE Release 8标准的码本只有4天线配置,因此有必要为LTE-A系统重新设计8天线码本。本文提出了一种适用于LTE-A下行系统的8天线码本方案。该方案使用酉矩阵和旋转矩阵,结合DFT码本以及LTE Release 8码本,不仅

2、保持后向兼容性,而且继承了LTE Release 8码本的优良特性。理论分析和模拟仿真证实了本方法的有效性。本文首先介绍了有关码本技术背景,并结合码本介绍了有限反馈在无线通信系统中的应用。这些应用有协方差量化、波束赋形、空间复用线性预编码等。其次基于LTERelease 8版本的物理层协议,进行了链路级仿真平台PDSCH发送模块的搭建工作。接着对包括码本设计在内的预编码模型进行了介绍。然后根据具有代表性的LTERelease 8码本和三星码本,对大家比较公认的码本设计原则进行了说明。最后介绍本文提出的码本算法的主要思想：结合8x8维度的DFT码本在非相关信道的优势,在LTERelease 8码

3、本设计的基础上,特别针对双极化信道状态矩阵的块对角化特征,设计了对应的旋转块对角化矩阵算法来生成LTE-A码本。这样设计的优点：继承LTE Release8码本的恒模特性、8-psk有限字符表特性、嵌套特性等优良特性,而且具有LTE-A系统的后向兼容性,特别是在双极化信道下本文设计的码本性能表现优秀。对具有代表性的LTE Release 8码本和三星码本进行理论反馈开销和复杂度分析,并在双极化信道、非相关信道和相关信道环境进行仿真,仿真结果进一步证明了本文提出的码本算法性能优良,能够有效提高系统的吞吐量和降低系统误块率,所以是一种适用于LTE-Advanced高效的码本设计方案。【英文摘要】W

4、ith the rising of the fourth generation of mobile communication technology, academic research on the LTE-Advanced is also growing. In recent years, MIMO enhancements technology based on the limited feedback is concerned.3GPP protocol 36.913 points out that LTE-A system should target a downlink peak

5、data rate of 1 Gbps, so it requires the number of antenna must be extended to eight in downlink transmission system of LTE-A. At present, the codebook of 3GPP LTE Release 8 standard codebook only supports four antennas, therefore, the design and research for a codebook based on limited feedback supp

6、orting eight antennas and its key algorithm is necessary in LTE-A downlink system. This thesis proposes a codebook method designed for eight antennas in dowenlink system of LTE-A. The proposed method uses the rotation of the DFT-based codebook, and reuses the LTE Release 8 codebook, not only to main

7、tain backward compatibility, but also inherit the good characteristics of LTE Release 8 codebook. Theoretical analysis and computer simulation confirm the validity of the method.Firstly this thesis describes the technical background about the codebook, and describes the application about codebook of

8、 limited feedback in wireless communication system. The application contains quantitative covariance, beamforming, spatial multiplexing with linear precoding. Secondly, based on the LTE Release 8 of the physical layer protocols, part of PDSCH sending module of the link level simulation platform is b

9、uilt. Then including codebook, precoding model is described. According LTE codebook and Samsung codebook, the recognized design principles of codebook are described. Finally, we introduce our idea of the proposed codebook:with combining the advantages of 8x8 DFT codebook in non-correlated channel, b

10、ased on LTE Release 8 codebook, we design of the corresponding rotation block diagonalization matrix for dual-polarized channel to generate the LTE-A codebook. This has the advantages that it can not only maintain the backward compatibility of LTE-A, but also inherit many good features of the LTE co

11、debook. We analysis the feedback overhead and the complexity of representative LTE Release 8 codebook and Samsung codebook in theoretical, and simulate them in the correlated channel, non-correlated channel and dual-polarized channel respectively. The simulation results show that the performance of

12、proposed codebook algorithm are excellent, it can effectively reduce the block error rate, and also improve the system throughput, so that it is a suitable design and efficient codebook for LTE-A system.【关键词】LTE-A 有限反馈 码本设计【英文关键词】LTE-A Limited Feedback Codebook Design【目录】基于有限反馈的LTE-A下行系统码本设计及关键算法研究摘

13、要6-7ABSTRACT7目录8-10第1章 绪论10-131.1 研究背景和研究意义101.2 国内外研究现状10-121.3 主要内容及组织结构12-13第2章 有关码本的有限反馈13-202.1 有限反馈系统概述132.2 有限反馈在多天线系统中的应用13-192.2.1 协方差量化14-152.2.2 波束赋形15-182.2.3 空间复用线性预编码18-192.2.4 有限反馈的缺点192.3 本章小结19-20第3章 物理层下行链路级仿真平台20-443.1 引言20-213.2 PDSCH发送21-433.2.1 DLSCH21-303.2.2 DLPCH30-433.3 链路级仿真平台搭建结果433.4 本章小结43-44第4章 LTE-A下行码本算法设计和性能仿真44-724.1 引言444.2 预编码系统模型44-464.3 经典码本算法46-534.3.1 3GPP LTE Release 8码本46-474.3.2 三星码本47