Pilot Contamination Alleviation in TDD Based Massive MIMO Sy

发布时间：2021-01-23 17:49

　　手机数据流量的不可控和快速增长给5G蜂窝网络的未来带来了巨大的挑战。根据一些研究,在2025年对数据流量的需求可能会增加10000倍。然而,当前蜂窝网络无法满足高频谱效率和高数据速率的需求。为了提高容量或频谱性能和效率,时分双工（TDD）大规模多输入多输出（massive-MIMO）被认为是未来无线蜂窝网络（5G）的关键技术,需要安装数百甚至数千个蜂窝天线和连接到基站的用户终端。然而,导频污染（PC）作为一个众所周知在大规模MIMO中由信道估计误差引起的状况,破坏和限定了这些目标。本文提出了一种创新的导频分配策略,即基于小区分割和扇区化的导频分配（CSS-PA）策略来减轻PC的负担。在这个策略中,以信号干扰噪声比（SINR）为基础,首先将用户划分为小区中心和边缘区域,随后对每个单元的边缘区域进行扇区化。然后将每个小区中心区域用户分配相同的导频序列。另一方面,对于边缘扇区,指定的序列在不同的小区中相互正交。在减轻的PC的帮助下,我们确定了近似的系统容量,其显示了无限数量的蜂窝天线在BS上的准确度。仿真结果表明,与传统的导频序列分配策略具有1或3个标记序列重用率相比,提出的CSS-PA策略... 

【文章来源】：北京邮电大学北京市 211工程院校 教育部直属院校

【文章页数】：60 页

【学位级别】：硕士

【文章目录】：
Acknowledgement
Abstract
摘要
Chapter 1 Introduction
    1.1 Background
    1.2 Multiple-Input Multiple-Output （MIMO）
        1.2.1 Single-User MIMO
        1.2.2 Multi-User MIMO System
    1.3 Massive MIMO
    1.4 Why Massive MIMO/Potential of massive MIMO
    1.5 Problem Statement
    1.6 Thesis Contribution
    1.7 Thesis Organization
    1.8 References
Chapter 2 Literature Review
    2.1 Channel Estimation for FDD and TDD Massive MIMO Systems
        2.1.1 FDD Mode
        2.1.2 TDD Mode
    2.2 Pilot Contamination and its main cause
    2.3 Related Works
        2.3.1 Pilot Sequence and Adaptive Pilot Allocation Algorithm
        2.3.2 Hungarian Algorithm
        2.3.3 Location aware and pilot assignment technique
        2.3.4 Asynchronous Pilot Transmission
        2.3.5 Scheme of Cell Sectorization Based Pilot Assignment （CS-PA）
        2.3.6 Pilot-Data Alignment and Fractional Pilot Reuse Scheme
        2.3.7 The Schemes of Pilot and Improved Partial Pilot Power Control
    2.4 Summary
    2.5 References
Chapter 3 Proposed Cell Splitting and Sectorization Based Pilot Assignment Scheme
    3.1 Overview of Channel Estimation Methods
        3.1.1 Least Squares Channel Estimation （LSCE）
        3.1.2 Minimum Mean Square Error （MMSE） Estimation
    3.2 System Model
    3.3 Proposed Scheme
        3.3.1 Cell Division
        3.3.2 Edge-Zone Sectorization
        3.3.3 Pilot Assignment
        3.3.4 SE Measurement
    3.4 Proposed Algorithm
    3.5 Achievable Spectral Efficiency of Proposed PA Technique
    3.6 Normalized Mean Square Error
    3.7 Summary
    3.8 References
Chapter 4 Simulation Results and Performance Analysis
    4.1 Simulation Parameters
    4.2 MSE and SNR Comparison
    4.3 Achievable Sum-Rates Versus Number of BS antennas
    4.4 SE Versus Number of Users
    4.5 NMSE Verses Effective SNR
    4.6 LS and MMSE Comparison
    4.7 Summary
Chapter 5 Conclusion and Future Work
    5.1 Conclusion
    5.2 Future Work
List of Publications


【参考文献】：
期刊论文
[1]大规模MIMO多小区TDD系统中的导频污染减轻方法[J]. 王海荣,王玉辉,黄永明,杨绿溪.  信号处理. 2013(02)



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