空间调制映射与星座图的研究与设计

发布时间：2018-03-22 22:18

本文选题：空间调制　切入点：广义空间调制　出处：《山东大学》2017年博士论文　论文类型：学位论文

【摘要】：空间调制是一种新型的多天线调制技术,它采用单射频链路即可实现低复杂度、高能效的信息传输,是非常具有应用前景的多天线传输技术之一。作为一种调制技术,如何提升其设计灵活性、实用性和传输可靠性是其研究重点之一。围绕该科研问题,本博士论文从比特符号映射和三维星座图的设计入手,开展了如下创新性工作:1.提出了三维联合映射空间调制的概念,解决了传统空间调制的发射天线数目约束问题,提高了设计灵活性和实用性。针对如何基于给定信号调制星座图实现三维星座图的最优设计问题,提出了一种针对每根激活天线分开选取最优子星座图来构造三维星座图的方法,并证明了在M-PSK作为信号调制时该设计方法的最优性。针对采用其他信号调制的情况,提出了一种低复杂度次优方案,并可轻松扩展到广义空间调制。2.基于创新性工作1的系统模型,进一步研究了空间调制一般化三维星座图设计问题。通过扩大星座符号的选取范围,从有限集合放宽到整个复数域,将一般化三维星座图设计建模成一个混合离散变量和连续变量的优化问题,提出了穷举设计算法和递归设计算法来求解该问题,实现了传输可靠性最高(即误符号率最小)的三维星座图设计。3.为进一步挖掘映射设计提高空间调制传输可靠性的潜力,针对简化的空间调制——空移键控系统,基于不同反馈信息提出了4种自适应比特符号映射方案。具体包括:在发射机已知信道状态信息时设计了 OBSA映射和低复杂度的POBSA映射;在有限反馈时设计了 RBSA映射和低复杂度、低反馈开销的PRBSA映射。理论分析了这4种设计的计算复杂度、反馈开销和性能增益,并都通过蒙特卡洛仿真进行了验证。所提设计在不需要额外的硬件消耗的情况下(例如额外的功率放大器、相位旋转部件和天线单元等)即可带来可观的性能提升。与此同时,它可和其他链路自适应技术相结合提供额外的性能增益。4.针对空移键控自适应映射扩展应用到空间调制存在反馈开销大、计算复杂度高的问题,进一步提出了适合空间调制、尤其更适合采用高进制信号调制星座图的空间调制的低反馈自适应映射设计——蛮力映射。量化分析了蛮力映射带来的性能增益,同时研究了最小反馈码本的设计问题。理论分析和仿真均表明,本文所提出的蛮力映射以少量反馈为代价即可显著提升系统可靠性。综上所述,本博士论文提出了三维联合映射空间调制和相应的三维星座图设计算法,并基于不同反馈信息设计了多种链路自适应映射,低成本低开销地提升了空间调制的设计灵活性和可靠性,使得该传输模式在未来的多天线传输系统中更具应用前景。
[Abstract]:Spatial modulation is a new type of multi-antenna modulation technology. It can achieve low complexity and high energy efficiency information transmission by using a single RF link. It is one of the most promising multi-antenna transmission technologies. How to improve its design flexibility, practicability and transmission reliability is one of its research emphases. The following innovative work is carried out: 1. The concept of 3D joint mapping spatial modulation is proposed, which solves the problem of the number of transmit antennas constrained by traditional spatial modulation. The design flexibility and practicability are improved. Aiming at how to realize the optimal design of 3D constellation diagram based on the given signal modulation constellation diagram, In this paper, an optimal sub-constellation diagram is selected separately for each active antenna to construct 3D constellation diagram, and the optimality of the design method when M-PSK is used as signal modulation is proved. A suboptimal scheme with low complexity is proposed, which can be easily extended to generalized spatial modulation. 2. The system model based on innovative work 1. In this paper, the generalized three-dimensional constellation map design of spatial modulation is further studied. By expanding the selection range of constellation symbols, the problem is extended from finite sets to the whole complex number domain. The generalized three-dimensional constellation design is modeled as an optimization problem with mixed discrete variables and continuous variables. An exhaustive design algorithm and a recursive design algorithm are proposed to solve the problem. The design of three-dimensional constellation diagram with the highest transmission reliability (that is, minimum symbol error rate) is realized. 3. In order to further excavate the potential of mapping design to improve the reliability of spatial modulation transmission, the simplified spatial modulation-air-shift keying system is proposed. Based on different feedback information, four adaptive bit symbol mapping schemes are proposed, including: the OBSA mapping and the low complexity POBSA mapping are designed when the transmitter has known the channel state information; In this paper, RBSA mapping and PRBSA map with low complexity and low feedback overhead are designed under the condition of finite feedback. The computational complexity, feedback overhead and performance gain of these four designs are analyzed theoretically. Both of them are verified by Monte Carlo simulation. The proposed design can bring significant performance gains without additional hardware consumption (such as additional power amplifiers, phase rotation units, antenna units, etc.). It can be combined with other link adaptive techniques to provide additional performance gain. 4. In view of the problems of large feedback overhead and high computational complexity in the application of spatial shift keying adaptive mapping expansion to spatial modulation, a new method for spatial modulation is proposed. Especially, it is more suitable for the design of low feedback adaptive mapping based on spatial modulation of high band signal modulation constellation, which is called barbarian force mapping. The performance gain brought by brute force mapping is analyzed quantificationally. At the same time, the design problem of minimum feedback codebook is studied. Theoretical analysis and simulation show that the brute force mapping proposed in this paper can significantly improve the reliability of the system at the cost of a small amount of feedback. In this dissertation, a 3D joint mapping spatial modulation algorithm and a corresponding 3D constellation map design algorithm are proposed, and various link adaptive maps are designed based on different feedback information. Low cost and low overhead enhance the design flexibility and reliability of spatial modulation, which makes the transmission mode more promising in the future multi-antenna transmission system.
【学位授予单位】：山东大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN911.3

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