本文關(guān)鍵詞： 非正交多址接入 多用戶檢測 信道容量 串行干擾消除 最小均方誤差　出處：《哈爾濱工業(yè)大學》2016年碩士論文　論文類型：學位論文

【摘要】：隨著移動通信的發(fā)展,4G已大規(guī)模商用,面向2020年的5G技術(shù)研究如火如荼。物聯(lián)網(wǎng)時代的到來,使得5G將會面臨海量連接的場景,迫切需要進一步提升系統(tǒng)容量�，F(xiàn)有的正交多址接入技術(shù)無法滿足5G多場景需求,非正交多址接入技術(shù)在信道容量性能上的優(yōu)越性使得非正交多址接入技術(shù)成為5G中的熱門候選技術(shù)。本文首先介紹了四種多用戶非正交接入系統(tǒng)以及多用戶檢測技術(shù)。非正交系統(tǒng)在發(fā)送端引入非正交,和正交多址接入不同,用戶數(shù)據(jù)互相不正交使得用戶之間存在較大干擾,所以接收端要利用復(fù)雜的多用戶檢測技術(shù)來分離用戶數(shù)據(jù)。線性檢測技術(shù)實現(xiàn)簡單,但是難以滿足系統(tǒng)性能需求,因此在接收端采用線性檢測模塊和串行干擾消除接收機相結(jié)合的接收機算法。其次,本文研究了下行多用戶非正交共享接入模型。以下行兩用戶非正交模型為基礎(chǔ),通過對下行AWGN信道容量的分析,論證了非正交接入方式的優(yōu)越性。對下行干擾消除方案進行分析,并給出仿真結(jié)果驗證其誤碼性能。并進一步對下行多用戶非正交共享接入模型進行改進,在發(fā)送端疊加編碼后引入擴展序列,進一步提升系統(tǒng)的誤碼性能。最后,本文研究了上行多用戶非正交接入模型。通過研究上行鏈路AWGN信道下的信道容量,證明了非正交多址上行信道容量優(yōu)于正交多址接入。對上行多用戶接入模型發(fā)送端進行研究,對比分析了采用不同擴展序列的性能,仿真結(jié)果表明采用復(fù)數(shù)多元序列性能更優(yōu)。在接收端,深入研究了MMSE-SIC算法,通過仿真給出用戶過載和誤碼性能曲線。針對MMSE-SIC時延較大的問題,本文提出了準并行干擾消除算法,該算法減小了時延,但是過載性能有所下降。于是在此基礎(chǔ)上提出改進干擾消除方案,保證過載性能的情況下,減小了高負載場景下系統(tǒng)時延。
[Abstract]:With the development of mobile communication, 4G has been used on a large scale. In 2020, the 5G technology research is in full swing. With the coming of Internet of things, 5G will face the scene of massive connection. There is an urgent need to further enhance the system capacity. The existing orthogonal multiple access technology can not meet the 5G multi-scene requirements. The superiority of non-orthogonal multiple access technology in channel capacity performance makes non-orthogonal multiple access technology a hot candidate in 5G. This paper first introduces four kinds of multi-user non-orthogonal access systems and multi-user detection. Measurement techniques. Non-orthogonal systems are introduced at the transmitter. Different from orthogonal multiple access, user data is not orthogonal to each other, so the receiver should use complex multi-user detection technology to separate user data. Linear detection technology is simple. However, it is difficult to meet the performance requirements of the system, so the receiver algorithm combining linear detection module and serial interference cancellation receiver is adopted in the receiver. Secondly. This paper studies the downlink multi-user non-orthogonal shared access model. Based on the following two-user non-orthogonal model, the channel capacity of downlink AWGN is analyzed. The superiority of non-orthogonal access is demonstrated. The scheme of downlink interference cancellation is analyzed, and the simulation results are given to verify its error performance. Furthermore, the multi-user non-orthogonal shared access model is further improved. After superposition coding at the transmitter, the extended sequence is introduced to further improve the error performance of the system. Finally. This paper studies the uplink multi-user non-orthogonal access model and the channel capacity under uplink AWGN channel. It is proved that the capacity of non-orthogonal multiple access uplink is better than that of orthogonal multiple access. Simulation results show that the performance of complex multivariate sequences is better. At the receiving end, the MMSE-SIC algorithm is deeply studied. The user overload and error performance curves are given by simulation. In order to solve the problem of large delay in MMSE-SIC, a quasi-parallel interference cancellation algorithm is proposed, which reduces the delay. On the basis of this, an improved interference cancellation scheme is proposed to ensure the overload performance and reduce the system delay in the high-load scenario.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN929.5
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本文編號：1455062