多用户空间相关MIMO信道容量研究
发布时间：2018-07-15 19:18
【摘要】：多输入多输出(MIMO)技术能够在不增加系统带宽和发射功率的情况下,大幅度地提升系统容量,改善无线通信系统的性能,因此成为目前研究的热点。本文在已有的研究基础上,开展空域相关MIMO系统容量和自由空间MIMO系统关键技术研究,选题具有理论意义和应用价值。论文的主要研究工作如下:1.在平坦衰落信道下,结合MIMO系统天线之间的相关特性,研究了Kronecker相关信道模型。针对瑞利衰落信道下的均匀线阵,给出了不同角度功率谱分布下的相关系数解析式,分析了角度扩展和天线间距对相关性的影响。2.给出了相关信道下单用户MIMO遍历容量的近似表达式,并仿真分析了角度扩展、天线间距和平均波达角对信道容量的影响。研究了相关信道下注水功率分配对信道容量的影响,仿真结果表明,信噪比较低时相关性对系统容量具有提升作用。3.基于大规模随机矩阵理论,使用确定性近似的方法研究分析了上行多用户MIMO容量。在发射端已知统计的信道状态信息的情况下,研究了广义注水功率分配的具体算法。仿真结果表明,确定性近似计算方法具有很高的准确性。4.在航空信道环境下,仿真对比了自由空间视距MIMO容量和瑞利衰落MIMO容量。提出了基于单载波频域均衡(SC-FDE)和正交频分复用技术的自由空间宽带MIMO系统,并对系统容量进行了仿真。针对SC-FDE系统,考虑了天线间时延对信道容量的影响,仿真结果表明,采用空时联合处理方法,码间干扰可以提升系统容量。
[Abstract]:Multiple input multiple output (MIMO) technology can greatly enhance the system capacity and improve the performance of wireless communication systems without increasing the system bandwidth and transmission power, so it has become a hot research topic at present. Based on the existing research, this paper studies the key technologies of spatially correlated MIMO systems and free-space MIMO systems. The topic is of theoretical significance and practical value. The main research work of this paper is as follows: 1. In flat fading channel, the Kronecker correlation channel model is studied based on the correlation between antennas of MIMO system. For the uniform linear array in Rayleigh fading channel, the analytical formula of correlation coefficient under different angular power spectrum distribution is given, and the influence of angle spread and antenna spacing on correlation is analyzed. The approximate expression of MIMO ergodic capacity of correlated channel ordering users is given and the effects of angle spread antenna spacing and average angle of arrival on channel capacity are simulated and analyzed. The influence of water injection power allocation on the channel capacity in correlated channel is studied. The simulation results show that the correlation can enhance the capacity of the system when the SNR is low. Based on the large-scale stochastic matrix theory, the uplink multi-user MIMO capacity is analyzed using deterministic approximation method. Under the condition that the channel state information of the transmitter is known, the algorithm of generalized water injection power allocation is studied. The simulation results show that the deterministic approximation method has a high accuracy. In the aeronautical channel environment, the free space line-of-sight MIMO capacity and Rayleigh fading MIMO capacity are compared. A free space broadband MIMO system based on single carrier frequency domain equalization (SC-FDE) and orthogonal frequency division multiplexing (OFDM) is proposed, and the system capacity is simulated. For SC-FDE system, the influence of time delay between antennas on the channel capacity is considered. The simulation results show that using space-time joint processing method, inter-symbol interference can enhance the capacity of the system.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3
，
本文编号：2125117
[Abstract]:Multiple input multiple output (MIMO) technology can greatly enhance the system capacity and improve the performance of wireless communication systems without increasing the system bandwidth and transmission power, so it has become a hot research topic at present. Based on the existing research, this paper studies the key technologies of spatially correlated MIMO systems and free-space MIMO systems. The topic is of theoretical significance and practical value. The main research work of this paper is as follows: 1. In flat fading channel, the Kronecker correlation channel model is studied based on the correlation between antennas of MIMO system. For the uniform linear array in Rayleigh fading channel, the analytical formula of correlation coefficient under different angular power spectrum distribution is given, and the influence of angle spread and antenna spacing on correlation is analyzed. The approximate expression of MIMO ergodic capacity of correlated channel ordering users is given and the effects of angle spread antenna spacing and average angle of arrival on channel capacity are simulated and analyzed. The influence of water injection power allocation on the channel capacity in correlated channel is studied. The simulation results show that the correlation can enhance the capacity of the system when the SNR is low. Based on the large-scale stochastic matrix theory, the uplink multi-user MIMO capacity is analyzed using deterministic approximation method. Under the condition that the channel state information of the transmitter is known, the algorithm of generalized water injection power allocation is studied. The simulation results show that the deterministic approximation method has a high accuracy. In the aeronautical channel environment, the free space line-of-sight MIMO capacity and Rayleigh fading MIMO capacity are compared. A free space broadband MIMO system based on single carrier frequency domain equalization (SC-FDE) and orthogonal frequency division multiplexing (OFDM) is proposed, and the system capacity is simulated. For SC-FDE system, the influence of time delay between antennas on the channel capacity is considered. The simulation results show that using space-time joint processing method, inter-symbol interference can enhance the capacity of the system.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3
，
本文编号：2125117
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