本文關鍵詞： 免信令傳輸 非正交多址技術 大連接支持 稀疏恢復 擴展碼設計　出處：《中國科學技術大學》2017年博士論文　論文類型：學位論文

【摘要】：在滿足了人與人之間的通信后,物聯(lián)網(wǎng)為無線通信的發(fā)展注入了新的活力。移動互聯(lián)網(wǎng)和物聯(lián)網(wǎng)已經(jīng)成了發(fā)展第五代移動通信(5G)系統(tǒng)的兩大驅(qū)動力。為了滿足5G通信的通信需求,一個新型的多址技術至關重要。第一代移動通信(1G)到第四代移動通信(4G)系統(tǒng)上行通信采用的都是正交的多址技術,面對5G通信的新要求,這些正交多址技術的不足日益凸顯出來,包括頻譜效率低、大連接支持能力差等。為此,通信的研究和標準制定工作對可以提供更高頻譜效率、更高接入量的非正交多址技術給予了重視。目前正在研究的上行非正交多址技術包括稀疏碼分多址(SCMA,sparse code multipleaccess)、多用戶共享接入(MUSA,multi-usershared access)以及圖樣分割多址(PDMA,pattern division multiple access)等。相對于正交的多址技術,這些非正交的多址技術可以極大提高系統(tǒng)的頻譜效率和大連接支持能力。不過這些非正交多址技術依然存在一些需要克服的技術困難。其次,除了 MUSA,它們在提出之初并沒有特別考慮通信用戶的多址接入過程。如果5G系統(tǒng)同樣采用以往系統(tǒng)中基于競爭的多址接入?yún)f(xié)議,則會面臨繁重的接入信令負擔,甚至產(chǎn)生信令風暴。這種情況下,即使是非正交多址技術的優(yōu)勢也會被嚴重削弱。針對上述問題,論文提出了免信令的上行非正交多址方法,并對其中的關鍵問題開展了研究。具體地,論文的主要內(nèi)容包括:1)提出了免信令的上行非正交多址方法提出的方法中,數(shù)據(jù)包首先進行擴展碼擴展處理,其結果是增加數(shù)據(jù)包的符號數(shù)量,擴展后的數(shù)據(jù)包再通過系統(tǒng)分配好的時頻資源進行傳輸,接收端進行多天線接收并完成數(shù)據(jù)的恢復。該過程中,用戶傳輸數(shù)據(jù)包的時頻資源早在用戶注冊網(wǎng)絡,或者第一次有數(shù)據(jù)包發(fā)送,或者系統(tǒng)為了平衡負載而進行資源的再分配時就已經(jīng)給定,系統(tǒng)動態(tài)而頻繁的無線資源分配并不需要。因此,所提方法可以免去接入信令開銷。同時,通過非正交擴展,系統(tǒng)允許相當多的用戶使用相同的時頻資源。因此相對于正交的多址方法,方法在頻譜效率、大連接的支持能力上也有非常明顯的優(yōu)勢。2)免信令上行非正交多址方法的數(shù)據(jù)恢復根據(jù)提出的方法,同時考慮用戶傳輸行為的稀疏性,論文建立了塊稀疏的非正交多址模型。由于采用的是免接入過程的多址方法,哪些用戶有傳輸數(shù)據(jù)包接收端預先并不知道。因此,數(shù)據(jù)恢復的任務包括檢測有傳輸數(shù)據(jù)包的用戶和解調(diào)這些用戶發(fā)送的數(shù)據(jù)符號。在這個問題上,論文借鑒稀疏恢復中迭代的塊正交匹配追蹤(BOMP,block orthogonal matching pursuit)算法提出了 PICNBOMP(perfect interference cancellation based and normalized BOMP)算法。PICNBOMP 的主要思想是將通信信號中常見的錯誤糾檢錯編碼融入到迭代算法中進行完美干擾消除,由此獲得了提高數(shù)據(jù)恢復準確性和降低恢復復雜度的雙重優(yōu)勢。特別地,該算法體現(xiàn)的思路具有普適性,其對于控制迭代算法的誤差傳播非常有效。只要消息具有糾檢錯編碼結構以及多個消息之間存在干擾,它們的迭代恢復即可借鑒論文中提高算法的思想。3)免信令上行非正交多址方法的擴展碼設計所提方法中,擴展碼至關重要,它的作用包括攜帶用戶身份信息、直接影響用戶傳輸數(shù)據(jù)之間的干擾和方法的實現(xiàn)復雜度等。擴展碼以預編碼矩陣的形式出現(xiàn)在方法中。基于PICNBOMP算法,論文從稀疏恢復算法用戶檢測和符號解調(diào)的準確性角度出發(fā)對預編碼矩陣應該滿足的條件進行了分析研究。分析的結果表明列正交的預編碼矩陣有利于提高恢復準確性。論文接著給出了三種列正交的預編碼矩陣設計實例,其中非常稀疏的正交預編碼矩陣還可以極大降低方法的實現(xiàn)復雜度。為了進一步降低稀疏恢復中用戶檢測的復雜度,論文設計了結構化的預編碼矩陣。相對于已有的非正交多址技術中的碼本/序列/圖樣設計,論文提出的非正交多址方法中的預編碼矩陣設計非常簡單,隨機產(chǎn)生的正交的預編碼矩陣就可以獲得相當不錯的多址性能。
[Abstract]:To meet the communication between people and things has injected new vitality to the development of wireless communication. The mobile Internet and the Internet of things has become the development of the fifth generation mobile communication system (5G) of the two major driving force. In order to meet the communication needs of 5G communication, a new multiple access technology is very important. The first generation of mobile communication (1G) to the fourth generation mobile communication system (4G) uplink communication are using orthogonal multiple access technology, facing the new requirements of 5G communication, lack of these orthogonal multiple access technology has become increasingly prominent, including low spectrum efficiency, high connection support ability. Therefore, research and communication standards the work can provide higher spectrum efficiency, non orthogonal multiple access technology with higher access amount given attention. Uplink is currently studying the non orthogonal multiple access techniques including sparse CDMA (SCMA, sparse code, multipleaccess) with Users share access (MUSA, multi-usershared access) and multiple access pattern segmentation (PDMA, pattern division multiple access). Compared with the orthogonal multiple access technology, the non orthogonal multiple access technology can greatly improve the spectrum efficiency and high connection support. However these non orthogonal multiple access technology, there are still some need to overcome technical difficulties. Secondly, in addition to MUSA, they are not particularly considering the multiple access communication of users in the process put forward at the beginning. If the 5G system also uses multiple access protocol based on competition in previous system, will face heavy burden access signaling, and even signaling storm. In this case, even if it is non orthogonal multiple access technology advantage will be seriously impaired. Aiming at the above problems, the proposed uplink signaling free non orthogonal multiple access method, and the key problems are studied. Specifically, the main contents of this paper include: 1) proposed uplink signaling method proposed free non orthogonal multiple access method, data packet first spreading code is processed, the result is to increase the number of symbol data packets, packet expanded through the system to allocate good time-frequency resources for transmission, reception the end of multi antenna receiving and data recovery. In this process, the user data packet transmission time frequency resource in network user registration, or the first packet, or the system of resource redistribution in order to balance the load and has been given, the radio resource allocation system dynamic and frequent. So don't need, the proposed method can be removed from the access signaling overhead. At the same time, the non orthogonal expansion system allows a considerable number of users use the same time-frequency resources. So compared with the method of orthogonal multiple access methods, in the spectrum efficiency Rate, ability to support connection has the obvious advantages of.2 signaling) free uplink non orthogonal multiple access method for data recovery based on the proposed method, considering the sparsity of user transmission behavior, the non orthogonal multiple access model block sparse. Due to the use of the multiple access method of free access process which users transmit data packets, the receiver is not known in advance. Therefore, the data recovery tasks include detection of transmitted data symbols user data packet transmission and demodulation of these users. In this issue, based on the block orthogonal sparse recovery iterative matching pursuit (BOMP block, orthogonal matching pursuit) algorithm is proposed for PICNBOMP (perfect interference cancellation based and normalized BOMP) algorithm.PICNBOMP is the communication signals in common error correcting encoding into iterative algorithm In perfect interference, thus obtained to improve accuracy and reduce the data recovery recovery advantages complexity. Especially, the algorithm embodies the ideas of universality, it is very effective to control the error propagation algorithm. As long as the message is there is interference between EDAC encoding structure and a plurality of messages, their iterative you can learn to improve the recovery algorithm.3 in this thesis) method proposed non orthogonal spreading code free signaling uplink multiple access methods, the spreading code is essential, its effects include carrying the user identity information, directly influences the realization method between user interference and data transmission. The complexity of spreading codes to pre encoding matrix appear in the method. Based on the PICNBOMP algorithm, the restoration algorithm of user detection and symbol demodulation accuracy from the sparse point of view of the precoding matrix should be full The condition was analyzed. The analysis results show that column orthogonal precoding matrix can improve the recovery accuracy. Then the paper gives the three column orthogonal precoding matrix design examples, including orthogonal pre encoding very sparse matrix method also can greatly reduce the complexity of implementation. In order to further reduce the complexity of sparse recovery user detection, this paper designed a structured precoding matrix. Compared with the codebook / non orthogonal multiple access technology has been in the series / pattern design, the design of precoding matrix non orthogonal multiple access method proposed in the paper is very simple, orthogonal random precoding matrix can obtain multiple access performance good.

【學位授予單位】：中國科學技術大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TN929.5

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