本文關(guān)鍵詞：空間調(diào)制系統(tǒng)中幾種關(guān)鍵技術(shù)的研究　出處：《大連理工大學》2016年博士論文　論文類型：學位論文

  更多相關(guān)文章： 空間調(diào)制 最優(yōu)檢測 天線選擇 干擾對齊 中斷概率

【摘要】：空間調(diào)制(Spatial Modulation, SM)技術(shù)是一種新興的多天線傳輸技術(shù),簡化了傳統(tǒng)MIMO系統(tǒng)結(jié)構(gòu),降低了系統(tǒng)實現(xiàn)成本,提高了通信系統(tǒng)的靈活性和能耗效率,作為未來5G通信的一個關(guān)鍵技術(shù),在室內(nèi)可見光通信和大規(guī)模MIMO通信中具有良好的應用前景,是當前無線通信研究的熱點課題�？臻g調(diào)制技術(shù)也是一種全新的混合調(diào)制方式,它把信號星座擴展到空間信號星座,使系統(tǒng)設計更靈活,但同時帶來了一些新的挑戰(zhàn)。對此本文較為深入地研究了空間調(diào)制系統(tǒng)發(fā)送端的天線選擇問題、接收端的信號檢測問題和多用戶干擾抑制問題,主要工作包括：首先,較為深入地研究了已有的空間調(diào)制系統(tǒng)的檢測算法,從二維矢量量化角度深入分析了已有的QAM調(diào)制信號的低復雜度最優(yōu)算法,利用PSK數(shù)字調(diào)制符號的固有性質(zhì)給出了與調(diào)制符號階數(shù)無關(guān)的低復雜度最優(yōu)檢測算法,擴展和完善了已有空間調(diào)制低復雜度最優(yōu)檢測算法。然后,分析比較了該低復雜度最優(yōu)檢測算法和現(xiàn)有檢測算法的優(yōu)缺點,從理論和仿真兩方面證明了該算法的最優(yōu)性和低計算復雜度特性。其次,針對SM系統(tǒng)天線選擇技術(shù)實現(xiàn)算法復雜度高且有性能損失的問題,本文提出了兩種基于最大化-最小歐氏距離天線選擇(Euclidean Distance Antenna Selection, EDAS)準則的低復雜度且BER性能最優(yōu)的天線選擇算法,EAQ-EDAS (Equal Amplitude and Quantization based EDAS)算法和RS-EDAS (Rotational Symmetry based EDAS)算法。EAQ-EDAS算法是針對MPSK調(diào)制的SM系統(tǒng)提出的,該算法利用了MPSK調(diào)制符號的等幅度特性,并采用二維量化原理,實現(xiàn)了復雜度與調(diào)制階數(shù)無關(guān)的天線選擇方法,同時保持了聯(lián)合搜索的EDAS算法的BER最優(yōu)性。RS-EDAS算法則是利用了調(diào)制符號的旋轉(zhuǎn)對稱性,降低了符號搜索空間的大小,進而降低算法的計算復雜度。最后,本文從不同角度證明了算法的低計算復雜度和BER性能最優(yōu)特性,并與現(xiàn)有的最優(yōu)天線選擇算法比較,驗證了提出的兩種算法具有極低的計算復雜度,同時與現(xiàn)有的次優(yōu)天線選擇算法比較,表明了本文提出的算法在BER性能上的優(yōu)勢,尤其在相關(guān)信道下優(yōu)越性更強。最后,本文利用干擾對齊技術(shù),解決了廣義空間調(diào)制(Generalized Spatial Modulation, GSM)干擾網(wǎng)絡和GSM認知無線電(GSM based Cognitive Radio, GSM-CR)網(wǎng)絡中各用戶之間的干擾問題。在GSM干擾網(wǎng)絡中,我們直接采用已有的干擾對齊經(jīng)典算法消除網(wǎng)絡中的干擾,并仿真驗證了基于干擾對齊技術(shù)的新傳輸方案能夠消除用戶間的干擾,同時提高各用戶的平均傳輸速率和網(wǎng)絡總?cè)萘�。針對GSM-CR網(wǎng)絡中的干擾問題,本文首先研究了基于干擾對齊的傳統(tǒng)CR網(wǎng)絡的干擾問題,提出了一種最優(yōu)收發(fā)機設計方案,在驗證了該方案的可行性、低復雜度和低反饋等特性后,將該方案的基本思想應用于GSM-CR網(wǎng)絡中。新算法利用了GSM網(wǎng)絡中干擾對齊實現(xiàn)條件的特殊性,將原有的最優(yōu)收發(fā)機設計方案從迭代算法簡化為非迭代算法,極大的降低了算法的復雜度。再者,該算法消除了GSM-CR網(wǎng)絡中各用戶間的干擾,優(yōu)化了各用戶的傳輸性能。仿真表明,兩種網(wǎng)絡中的干擾對齊方案均可以消除用戶間的干擾,并提高網(wǎng)絡的總?cè)萘俊?br/>[Abstract]:Spatial modulation (Spatial Modulation SM) technology is a multi antenna transmission technology, simplifies the structure of the traditional MIMO system, reduces system cost, increase the flexibility of the communication system and energy efficiency as a key technology for future 5G communication, and has good application prospect in the indoor visible light communication and large scale MIMO communication, wireless communication is a hot topic of current research. Space modulation technology is also a new hybrid modulation mode. It expands the signal constellation to the constellation of space signals, making the system design more flexible, but it brings some new challenges at the same time. This paper thoroughly studies the antenna transmission spatial modulation system terminal selection problem, problem of receiver signal detection and multiuser interference suppression, the main work includes: firstly, thoroughly study the detection algorithm of spatial modulation of the existing system, in-depth analysis of the low complexity optimal algorithm of QAM modulated signal has the from the angle of two dimensional vector quantization, given by means of the inherent nature of PSK digital modulation symbols are irrelevant to the modulation symbol order of low complexity optimal detection algorithm, expand and improve the existing spatial modulation low complexity optimal detection algorithm. Then, the advantages and disadvantages of the low complexity optimal detection algorithm and the existing detection algorithm are analyzed and compared, and the optimality and low computational complexity of the algorithm are proved from two aspects of theory and simulation. Secondly, according to the SM system antenna selection algorithm with high complexity and performance loss problems, this paper puts forward two kinds of maximum - minimum Euclidean distance based on antenna selection (Euclidean Distance Antenna Selection, EDAS) antenna selection algorithm with low complexity criterion and BER optimal performance, EAQ-EDAS (Equal Amplitude and Quantization based EDAS RS-EDAS (Rotational Symmetry) algorithm and based EDAS algorithm). The EAQ-EDAS algorithm is proposed for the SM system with MPSK modulation, the algorithm uses MPSK modulation symbols such as amplitude characteristics, and using two-dimensional quantitative principle, the antenna complexity and modulation order independent selection method, while maintaining the EDAS algorithm combined search BER optimality. The RS-EDAS algorithm uses the rotational symmetry of the modulated symbol to reduce the size of the symbol search space, and then reduces the computational complexity of the algorithm. Finally, this paper proves that the algorithm with low computational complexity and BER optimal performance characteristics from different angles, and the optimal antenna selection algorithm and the existing comparison, verify the two proposed algorithm has very low computational complexity, and compared with the existing sub optimal antenna selection algorithm, show the advantage of the proposed algorithm in this paper BER performance, especially in the channel superiority stronger. Finally, we use interference alignment technology to solve the problem of interference between users in Generalized Spatial Modulation (GSM) interference network and GSM based Cognitive Radio (GSM-CR) network. In the GSM interference in the network, we directly using interference alignment existing classical algorithms to eliminate the interference in the network, and verified a new transmission scheme for interference alignment technique can eliminate the interference between users based on the total capacity and improve the average transmission rate of each user and network. To solve the problem of interference in GSM-CR network, this paper studies the interference problem of traditional CR network based on interference alignment, the paper proposed a design scheme of optimal transceiver, after verifying the feasibility of the solution of low complexity and low feedback characteristics, the basic idea of the application of the scheme in GSM-CR networks. The new algorithm takes advantage of the particularity of the interference alignment in the GSM network, simplifies the original optimal transceiver design scheme from the iterative algorithm to the non iterative algorithm, which greatly reduces the complexity of the algorithm. Furthermore, the algorithm eliminates the interference between the users in the GSM-CR network and optimizes the transmission performance of each user. The simulation shows that the interference alignment schemes in the two networks can eliminate the interference between users and improve the total network capacity.
【學位授予單位】：大連理工大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN919.3

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