面向5G毫米波通信的混合接收机结构研究

发布时间：2018-10-29 16:43

【摘要】：由于毫米波的频率高、可用带宽大,能给系统提供每秒千兆比特的传输速率,因此被视为5G通信的一项关键技术。为了保证足够的链路余量,毫米波系统在收发端需要都采用大规模天线的定向波束成型技术,由于硬件设备的高成本和功率损耗,毫米波频段的MIMO系统被分成模拟域和数字域两部分。因此,与微波频段的MIMO系统相比,多天线技术要求提出毫米波系统专有的通信算法,在此背景下,本文从系统的混合结构、信道模型、信道估计和混合合成算法这几方面对毫米波通信的MIMO系统进行研究。首先,本文给出了毫米波通信的系统结构,研究的基于开关切换器的混合结构与基于移相器的混合结构相比,具有更低的复杂度和功耗,并定义能量模型,用来评估两种结构的功率损耗。其次,本文研究了信道估计技术,将稀疏多径的毫米波信道估计转化为信号的重建,并采用压缩感知理论的重构算法进行毫米波的信道估计,同时也应用了最小二乘法对毫米波信道进行了估计,并对两种算法的估计性能进行仿真分析。最后,利用估计的信道状态信息,设计了合成算法,并对每种结构能实现的频谱效率和比特率进行仿真,综合分析每种结构的硬件复杂度、功耗和频谱效率,基于开关切换器的混合结构能获得更好的性能。
[Abstract]:Because of the high frequency of millimeter-wave and the large available bandwidth, it can provide the transmission rate of gigabit per second to the system, so it is regarded as a key technology in 5G communication. In order to ensure sufficient link allowance, the millimeter wave system needs to adopt the directional beamforming technology of large scale antenna in the transceiver, because of the high cost and power loss of hardware equipment. The MIMO system of millimeter wave band is divided into analog domain and digital domain. Therefore, compared with the MIMO system in microwave frequency band, the multi-antenna technology requires a special communication algorithm for millimeter-wave system. In this context, the mixed structure of the system, the channel model, The MIMO system for millimeter wave communication is studied in the aspects of channel estimation and hybrid synthesis algorithm. Firstly, the system structure of millimeter-wave communication is given. Compared with the hybrid structure based on phase shifter, the hybrid structure based on switch has lower complexity and power consumption, and the energy model is defined. Used to evaluate the power loss of both structures. Secondly, the channel estimation technique is studied in this paper. The sparse multipath millimeter wave channel estimation is transformed into signal reconstruction, and the reconstruction algorithm based on compression perception theory is used to estimate the millimeter wave channel. At the same time, the least square method is used to estimate the millimeter-wave channel, and the performance of the two algorithms is simulated. Finally, using the estimated channel state information, the synthesis algorithm is designed, and the spectrum efficiency and bit rate of each structure are simulated, and the hardware complexity, power consumption and spectrum efficiency of each structure are analyzed synthetically. The hybrid structure based on switch can achieve better performance.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN928

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