LTEA论文：基于有限反馈的LTEA下行系统码本设计及关键算法研究.docVIP

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】With 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 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 supporting 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 maintain 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