本文選題：空間調(diào)制　切入點：廣義空間調(diào)制　出處：《山東大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：空間調(diào)制是一種新型的多天線調(diào)制技術(shù),它采用單射頻鏈路即可實現(xiàn)低復(fù)雜度、高能效的信息傳輸,是非常具有應(yīng)用前景的多天線傳輸技術(shù)之一。作為一種調(diào)制技術(shù),如何提升其設(shè)計靈活性、實用性和傳輸可靠性是其研究重點之一。圍繞該科研問題,本博士論文從比特符號映射和三維星座圖的設(shè)計入手,開展了如下創(chuàng)新性工作:1.提出了三維聯(lián)合映射空間調(diào)制的概念,解決了傳統(tǒng)空間調(diào)制的發(fā)射天線數(shù)目約束問題,提高了設(shè)計靈活性和實用性。針對如何基于給定信號調(diào)制星座圖實現(xiàn)三維星座圖的最優(yōu)設(shè)計問題,提出了一種針對每根激活天線分開選取最優(yōu)子星座圖來構(gòu)造三維星座圖的方法,并證明了在M-PSK作為信號調(diào)制時該設(shè)計方法的最優(yōu)性。針對采用其他信號調(diào)制的情況,提出了一種低復(fù)雜度次優(yōu)方案,并可輕松擴展到廣義空間調(diào)制。2.基于創(chuàng)新性工作1的系統(tǒng)模型,進一步研究了空間調(diào)制一般化三維星座圖設(shè)計問題。通過擴大星座符號的選取范圍,從有限集合放寬到整個復(fù)數(shù)域,將一般化三維星座圖設(shè)計建模成一個混合離散變量和連續(xù)變量的優(yōu)化問題,提出了窮舉設(shè)計算法和遞歸設(shè)計算法來求解該問題,實現(xiàn)了傳輸可靠性最高(即誤符號率最小)的三維星座圖設(shè)計。3.為進一步挖掘映射設(shè)計提高空間調(diào)制傳輸可靠性的潛力,針對簡化的空間調(diào)制——空移鍵控系統(tǒng),基于不同反饋信息提出了4種自適應(yīng)比特符號映射方案。具體包括:在發(fā)射機已知信道狀態(tài)信息時設(shè)計了 OBSA映射和低復(fù)雜度的POBSA映射;在有限反饋時設(shè)計了 RBSA映射和低復(fù)雜度、低反饋開銷的PRBSA映射。理論分析了這4種設(shè)計的計算復(fù)雜度、反饋開銷和性能增益,并都通過蒙特卡洛仿真進行了驗證。所提設(shè)計在不需要額外的硬件消耗的情況下(例如額外的功率放大器、相位旋轉(zhuǎn)部件和天線單元等)即可帶來可觀的性能提升。與此同時,它可和其他鏈路自適應(yīng)技術(shù)相結(jié)合提供額外的性能增益。4.針對空移鍵控自適應(yīng)映射擴展應(yīng)用到空間調(diào)制存在反饋開銷大、計算復(fù)雜度高的問題,進一步提出了適合空間調(diào)制、尤其更適合采用高進制信號調(diào)制星座圖的空間調(diào)制的低反饋自適應(yīng)映射設(shè)計——蠻力映射。量化分析了蠻力映射帶來的性能增益,同時研究了最小反饋碼本的設(shè)計問題。理論分析和仿真均表明,本文所提出的蠻力映射以少量反饋為代價即可顯著提升系統(tǒng)可靠性。綜上所述,本博士論文提出了三維聯(lián)合映射空間調(diào)制和相應(yīng)的三維星座圖設(shè)計算法,并基于不同反饋信息設(shè)計了多種鏈路自適應(yīng)映射,低成本低開銷地提升了空間調(diào)制的設(shè)計靈活性和可靠性,使得該傳輸模式在未來的多天線傳輸系統(tǒng)中更具應(yīng)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.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TN911.3

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相關(guān)期刊論文 前1條

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本文編號：1650652