分布式天线系统下行链路预编码技术研究

发布时间：2018-06-07 05:52

本文选题：分布式天线 + 协作多点传输　；参考：《东南大学》2016年硕士论文

【摘要】：随着移动互联网的快速发展和智能终端的大量普及,各种多媒体业务如网页浏览、社交网络、手机游戏、电子商务和高清视频等的相继涌现,人们对移动通信系统的速率和质量等提出了更高的要求和挑战。分布式天线技术可以有效地提高通信系统的容量和频谱利用率,已经成为未来移动通信系统的重要候选技术,以分布式天线为基础的协作多点传输技术已经被LTE-Advanced和802.11m标准所采纳。本文主要对分布式天线系统下行链路预编码技术进行了研究。首先,本文介绍了MIMO多天线技术和分布式天线技术的基本原理,概述了分布式天线系统的研究进展和多用户下行链路预编码技术。其次,本文研究了分布式天线系统的信道模型和相关性能。本文将MIMO多天线技术与分布式天线技术相结合,在对分布式天线系统信道建模的基础上,重点分析和研究了分布式天线系统的覆盖特性和信道容量。仿真结果表明,分布式天线系统比集中式天线系统具有更好的覆盖和信道容量性能。然后,本文研究了单小区分布式天线系统下行链路预编码技术。本文在分析传统经典的多用户预编码算法的基础上,提出了一种基于信漏噪比和信干噪比准则的收发联合优化算法及其加权算法,推导了最优预编码向量和接收合并向量的表达式。仿真结果表明,本文提出的改进算法能够有效提高系统的平均数据速率和平均误符号率性能。最后,本文研究了多小区分布式天线系统下行链路预编码技术。本文将协作多点传输技术与分布式天线技术相结合,针对多小区分布式天线协作系统,提出了一种基于用户位置的选择性协作传输方案,并通过在给定的接收信噪比约束条件下最小化系统的总发射功率来进行预编码设计。仿真结果表明,本文所提方案能够在系统发射功率和协作小区的信息交互之间取得折中。
[Abstract]:With the rapid development of mobile Internet and the popularity of intelligent terminals, various multimedia services such as web browsing, social networks, mobile games, e-commerce and high-definition video have emerged one after another. People put forward higher request and challenge to the rate and quality of mobile communication system. Distributed antenna technology can effectively improve the capacity and spectrum efficiency of communication systems, and has become an important candidate technology for mobile communication systems in the future. Cooperative multipoint transmission based on distributed antennas has been adopted by LTE-Advanced and 802.11m standards. In this paper, the downlink precoding technology of distributed antenna system is studied. Firstly, this paper introduces the basic principles of MIMO multi-antenna technology and distributed antenna technology, and summarizes the research progress of distributed antenna system and multi-user downlink precoding technology. Secondly, the channel model and related performance of distributed antenna system are studied. In this paper, MIMO multi-antenna technology and distributed antenna technology are combined. Based on the channel modeling of distributed antenna system, the coverage characteristics and channel capacity of distributed antenna system are analyzed and studied. The simulation results show that the distributed antenna system has better coverage and channel capacity performance than the centralized antenna system. Then, the downlink precoding technology of single cell distributed antenna system is studied. Based on the analysis of the classical multiuser precoding algorithm, this paper presents a new algorithm based on SINR and SINR criterion and its weighting algorithm. The expressions of the optimal precoding vector and the reception merge vector are derived. Simulation results show that the proposed improved algorithm can effectively improve the performance of the average data rate and the average symbol error rate of the system. Finally, the downlink precoding technology of multi-cell distributed antenna system is studied. In this paper, we combine cooperative multi-point transmission technology with distributed antenna technology, and propose a selective cooperative transmission scheme based on user location for multi-cell distributed antenna cooperative system. The precoding design is carried out by minimizing the total transmit power of the system under the given SNR constraints. The simulation results show that the proposed scheme can achieve a compromise between the transmission power of the system and the information interaction of the cooperative cell.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5

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