预编码空间调制方案的研究与仿真
发布时间：2019-04-26 04:39
【摘要】：多输入多输出技术(MIMO,Multiple Input Multiple Output)在发射端和接收端配置了多根天线,提升了信道容量和系统吞吐率,因而成为现代无线通信的关键技术之一。然而多天线的配置给系统带来巨大优势的同时也带来较多问题,其中之一就是多天线同时传输信号带来较大的天线间干扰(IAI,InterAntenna Interference),进一步导致接收端检测复杂度增大。针对该问题,空间调制技术(GSM,Generalised Spatial Modulation)减少发射端天线同时传输信号的数量,增加了空间域传输信息的方式,有效减少甚至消除了IAI,大大减少了发送端和接收端的复杂度,成为研究热点之一。预编码空间调制技术(GPSM,Generalised Pre-coding Spatial Modulation)则需要发射端获取信道状态信息进行预编码,减少接收端同时接收有用信号的数量达到在空间域传输信息的目的,这样便将计算任务从接收端转移到了发射端,大大减少了接收端的复杂度,因此GPSM方案适用于蜂窝网中基站到移动用户的下行链路通信场景。本文首先介绍了论文的研究背景,GSM、GPSM技术的国内外研究现状。详细说明了MIMO技术中的一种典型系统,垂直分层空时码系统的系统模型,工作原理以及系统特点。最后对空间调制系统的系统模型和系统特点进行详细阐述。论文主要研究了单用户模式下GPSM方案的系统性能,首先介绍了该方案的系统模型,主要包括传输符号的调制方法,主要的检测方案和工作原理。然后介绍了常用的两种预编码器,ZF和MMSE预编码器,推导采用该预编码器的平均误比特率的解析解上界,与链路级仿真结果进行比较以相互验证正确性。对GPSM方案进行BER性能仿真,速率匹配分析和鲁棒性分析,并与传统的MIMO方案在BER性能,传输速率和鲁棒性和接收端计算复杂度等方面进行比较,得出GPSM方案更优的结论。其次将GPSM方案应用到多用户情景下进行性能分析。采用了线性和非线性预编码技术。线性预编码包括三种多用户预编码方案,将其经过调整或改进后与GPSM方案结合,对比分析了三种方案的优缺点。非线性预编码技术则采用了THP(Tomlinson-Harashima Precoding)预编码,为了与预编码空间调制方案结合,将多用户单流系统推广到多用户多流系统,对结合方案的BER性能进行仿真分析。最后针对该方案的用户性能差异较大的问题,研究了”best-first”排序方法以最小化每个用户的等效噪声方差,仿真结果显示系统整体性能得到提高,并讨论分析了”best-first”排序法能有效提高系统平均性能的条件。
[Abstract]:Multi-input multiple-output (MIMO,Multiple Input Multiple Output) technology is one of the key technologies in modern wireless communication due to the deployment of multiple antennas at the transmitter and receiver, which improves the channel capacity and system throughput. However, the configuration of multi-antenna brings great advantages to the system as well as many problems, one of which is that multi-antenna simultaneous transmission signal brings about large inter-antenna interference (IAI,InterAntenna Interference),) further increases the detection complexity of the receiver. In order to solve this problem, the spatial modulation technology (GSM,Generalised Spatial Modulation) reduces the number of transmit signals at the same time, increases the way of transmitting information in the space domain, and effectively reduces or even eliminates the IAI,. It greatly reduces the complexity of the sender and receiver, and becomes one of the research hotspots. Pre-coded spatial modulation (GPSM,Generalised Pre-coding Spatial Modulation) requires the transmitter to obtain channel state information for pre-coding, to reduce the number of useful signals received by the receiver at the same time to achieve the purpose of transmitting information in the spatial domain. In this way, the computing task is transferred from the receiver to the transmitter, and the complexity of the receiver is greatly reduced. Therefore, the GPSM scheme is suitable for downlink communication scenarios from base stations to mobile users in cellular networks. Firstly, this paper introduces the research background of this paper, and the research status of GSM,GPSM technology at home and abroad. In this paper, a typical system in MIMO technology, the system model, working principle and system characteristics of vertical layered space-time code system are described in detail. Finally, the system model and system characteristics of spatial modulation system are described in detail. In this paper, the system performance of the GPSM scheme in single user mode is studied. Firstly, the system model of the scheme is introduced, including the modulation method of the transmission symbol, the main detection scheme and the working principle. Then two common precodecs, ZF and MMSE precodecs, are introduced. The upper bound of the analytic solution of the average bit error rate of the precodecs is deduced and compared with the link level simulation results to verify the correctness of the precodecs. The BER performance simulation, rate matching analysis and robustness analysis of the GPSM scheme are carried out. Compared with the traditional MIMO scheme in the aspects of BER performance, transmission rate and robustness, and the computational complexity of the receiver, the conclusion is drawn that the GPSM scheme is better than the traditional MIMO scheme in terms of performance, transmission rate, robustness and computational complexity of the receiver. Secondly, the GPSM scheme is applied to the multi-user scenario for performance analysis. Linear and nonlinear precoding techniques are used. The linear precoding includes three multi-user precoding schemes, which are adjusted or improved and combined with the GPSM scheme. The advantages and disadvantages of the three schemes are compared and analyzed. The nonlinear precoding technology adopts THP (Tomlinson-Harashima Precoding) precoding. In order to combine with the pre-coded spatial modulation scheme, the multi-user single-stream system is extended to the multi-user multi-stream system, and the BER performance of the combination scheme is simulated and analyzed. Finally, in order to minimize the equivalent noise variance of each user, the "best-first" ranking method is studied to solve the problem that the user performance of the scheme varies greatly. The simulation results show that the overall performance of the system is improved. The conditions under which the "best-first" sequencing method can effectively improve the average performance of the system are also discussed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3
本文编号：2465760
[Abstract]:Multi-input multiple-output (MIMO,Multiple Input Multiple Output) technology is one of the key technologies in modern wireless communication due to the deployment of multiple antennas at the transmitter and receiver, which improves the channel capacity and system throughput. However, the configuration of multi-antenna brings great advantages to the system as well as many problems, one of which is that multi-antenna simultaneous transmission signal brings about large inter-antenna interference (IAI,InterAntenna Interference),) further increases the detection complexity of the receiver. In order to solve this problem, the spatial modulation technology (GSM,Generalised Spatial Modulation) reduces the number of transmit signals at the same time, increases the way of transmitting information in the space domain, and effectively reduces or even eliminates the IAI,. It greatly reduces the complexity of the sender and receiver, and becomes one of the research hotspots. Pre-coded spatial modulation (GPSM,Generalised Pre-coding Spatial Modulation) requires the transmitter to obtain channel state information for pre-coding, to reduce the number of useful signals received by the receiver at the same time to achieve the purpose of transmitting information in the spatial domain. In this way, the computing task is transferred from the receiver to the transmitter, and the complexity of the receiver is greatly reduced. Therefore, the GPSM scheme is suitable for downlink communication scenarios from base stations to mobile users in cellular networks. Firstly, this paper introduces the research background of this paper, and the research status of GSM,GPSM technology at home and abroad. In this paper, a typical system in MIMO technology, the system model, working principle and system characteristics of vertical layered space-time code system are described in detail. Finally, the system model and system characteristics of spatial modulation system are described in detail. In this paper, the system performance of the GPSM scheme in single user mode is studied. Firstly, the system model of the scheme is introduced, including the modulation method of the transmission symbol, the main detection scheme and the working principle. Then two common precodecs, ZF and MMSE precodecs, are introduced. The upper bound of the analytic solution of the average bit error rate of the precodecs is deduced and compared with the link level simulation results to verify the correctness of the precodecs. The BER performance simulation, rate matching analysis and robustness analysis of the GPSM scheme are carried out. Compared with the traditional MIMO scheme in the aspects of BER performance, transmission rate and robustness, and the computational complexity of the receiver, the conclusion is drawn that the GPSM scheme is better than the traditional MIMO scheme in terms of performance, transmission rate, robustness and computational complexity of the receiver. Secondly, the GPSM scheme is applied to the multi-user scenario for performance analysis. Linear and nonlinear precoding techniques are used. The linear precoding includes three multi-user precoding schemes, which are adjusted or improved and combined with the GPSM scheme. The advantages and disadvantages of the three schemes are compared and analyzed. The nonlinear precoding technology adopts THP (Tomlinson-Harashima Precoding) precoding. In order to combine with the pre-coded spatial modulation scheme, the multi-user single-stream system is extended to the multi-user multi-stream system, and the BER performance of the combination scheme is simulated and analyzed. Finally, in order to minimize the equivalent noise variance of each user, the "best-first" ranking method is studied to solve the problem that the user performance of the scheme varies greatly. The simulation results show that the overall performance of the system is improved. The conditions under which the "best-first" sequencing method can effectively improve the average performance of the system are also discussed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3
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