用户具有多天线的大规模天线系统的研究

发布时间：2018-04-25 05:15

本文选题：大规模MIMO + ZF　；参考：《杭州电子科技大学》2017年硕士论文

【摘要】：无线通信技术已步入一个快速发展的阶段,人们对无线传输速率和质量的要求越来越高。大规模MIMO传输技术以其较高的频谱效率和功率效率成为下一代无线通信系统的关键技术之一。大规模MIMO技术通过在通信系统的发送端或/和接收端设置多根天线,允许多个天线同时发送或接收多个空间数据流,成为一种可用于提高性能或容量的资源,实现多个空间数据链路共享时间和频段的传输技术。由于大规模多输入多输出(MIMO)系统能够极大地增加系统容量和提高无线链路的质量方面的优点,其受到越来越多的关注。在以往的大规模MIMO系统研究中,往往是针对单天线用户的大规模MIMO系统进行研究。另一方面,随着技术的不断发展,在用户端装有多根天线也成为可能。本文对用户具有两根天线的大规模MIMO系统进行了分析研究。针对多小区的大规模MIMO上行系统,每个小区装备有M根天线的基站和同频同时段服务于K个用户。在假设每个用户端装备有两根天线的前提下,首先为了极大化线性解码的好处如ZF、MMSE解码,一个空时码的设计准则被给出;其次,本论文推导出系统在分别采用ZF、MMSE解码方法和所设计空时码的条件下用户可达上行速率的下限。并和已有单天线用户的大规模MIMO系统可达上行速率进行仿真比较,仿真结果表明双天线用户的大规模MIMO系统在同等条件下其可达上行速率几乎优于单天线用户的大规模MIMO系统的两倍。最后,在接收功率受限情况下,推导出当基站天线数M??时,用户可达上行速率的近似值。最后,对于单小区上行系统,本论文还推导了其在分别使用ZF和MMSE解码方法下的成对错误概率(PEP)公式,得出其成对错误概率的上下界以及近似估计的解析式。仿真结果验证了所推导出结论的正确性。最后在同样比特传输速率情况下,对单天线用户系统和双天线用户系统的误比特率做仿真比较,仿真结果表明双天线用户的误比特率要远远低于单天线用户的误比特率。
[Abstract]:Wireless communication technology has entered a stage of rapid development, people demand more and more high wireless transmission rate and quality. Large-scale MIMO transmission technology has become one of the key technologies in the next generation wireless communication system because of its high spectral efficiency and power efficiency. Large-scale MIMO technology allows multiple antennas to transmit or receive multiple spatial data streams simultaneously by setting multiple antennas at the transmitter or / and receiver of the communication system, becoming a resource that can be used to improve performance or capacity. The transmission technology of sharing time and frequency band for multiple spatial data links is realized. Because large scale MIMO systems can greatly increase system capacity and improve the quality of wireless links, more and more attention has been paid to it. In the past large scale MIMO system research, usually is the large-scale MIMO system which the single antenna user carries on the research. On the other hand, with the development of technology, it is possible to install multiple antennas at the user end. In this paper, a large scale MIMO system with two antennas is analyzed and studied. For a large scale MIMO uplink system with multi-cell, each cell is equipped with M-antenna base station and serves K users at the same time. Assuming that each client is equipped with two antennas, a design criterion of space-time codes is given for maximizing the benefits of linear decoding, such as ZFU MMSE decoding. In this paper, the lower limit of the uplink rate is derived under the condition that the system adopts the ZFU MMSE decoding method and the designed space-time code, respectively. And compared with the large scale MIMO system with single antenna, the uplink rate of the system is simulated and compared. The simulation results show that the uplink rate of the large scale MIMO system with dual antenna users is almost twice that of the large scale MIMO system with single antenna users under the same conditions. Finally, when the received power is limited, the number of antennas in the base station is deduced. The user reaches an approximation of the uplink rate. Finally, for a single cell uplink system, the pairwise error probability formula is derived by using ZF and MMSE decoding methods, and the upper and lower bounds of the pair error probability and the analytical formula of approximate estimation are obtained. The simulation results verify the correctness of the deduced conclusions. Finally, under the same bit transmission rate, the bit error rate of single antenna user system and dual antenna user system is simulated and compared. The simulation results show that the bit error rate of dual antenna user is much lower than that of single antenna user.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3

【参考文献】