【摘要】：隨著系統(tǒng)帶寬和數(shù)據(jù)速率的增加,移動(dòng)網(wǎng)絡(luò)的速率也飛速提升。無(wú)線移動(dòng)通信正處于一個(gè)快速發(fā)展的時(shí)期,在不久的將來(lái)會(huì)進(jìn)入5G時(shí)代。3D MIMO技術(shù),通過(guò)充分利用空間資源,使基站能夠更加有效地區(qū)分不同用戶(hù),提高系統(tǒng)性能,現(xiàn)已成為5G移動(dòng)通信中的關(guān)鍵技術(shù)之一。本文首先介紹了MIMO的相關(guān)理論知識(shí),簡(jiǎn)單分析了MIMO傳輸模型。并且著重對(duì)三種技術(shù):單用戶(hù)3D MIMO的預(yù)編碼、單用戶(hù)3D MIMO基于CSI-RS的預(yù)編碼以及多用戶(hù)調(diào)度技術(shù)進(jìn)行了研究,全文具體工作如下:第一,研究3D MIMO系統(tǒng)下四種典型單用戶(hù)預(yù)編碼方案,分別是:基于點(diǎn)乘的預(yù)編碼方案,基于等價(jià)信道的預(yù)編碼方案,基于克羅內(nèi)克積的預(yù)編碼方案和基于信道轉(zhuǎn)化的預(yù)編碼方案。并且在URA天線陣列模型下,對(duì)四種預(yù)編碼方案進(jìn)行了仿真分析和比較,仿真顯示,基于信道轉(zhuǎn)化的預(yù)編碼方案的系統(tǒng)性能較優(yōu)于其他三種方案。第二,研究單用戶(hù)下基于CSI-RS的預(yù)編碼方案,由于大幅增加發(fā)射天線數(shù)目,但導(dǎo)頻資源開(kāi)銷(xiāo)受限,可得的系統(tǒng)增益也會(huì)受到阻礙,這將對(duì)預(yù)編碼方案的設(shè)計(jì)提出更高的要求,并且在現(xiàn)有的方法中,發(fā)射端往往在垂直方向提供一個(gè)數(shù)據(jù)流,沒(méi)有有效地提高系統(tǒng)性能。為了解決上述問(wèn)題,提出了兩種基于CSI-RS的預(yù)編碼方案。第三,研究多用戶(hù)調(diào)度和正交碼本聯(lián)合設(shè)計(jì)方案,首先證明了3D MIMO系統(tǒng)下基于Kronecker碼本的正交成立條件。為了充分利用碼字間的正交性,提出了一種通過(guò)對(duì)DFT矩陣進(jìn)行Fourier擾動(dòng)的3D正交碼本,對(duì)多用戶(hù)系統(tǒng)下的不同用戶(hù)之間的干擾有較強(qiáng)的抑制作用,并且本文提出了一種與之相適應(yīng)的用戶(hù)調(diào)度方案。仿真結(jié)果表明,本文提出的多用戶(hù)調(diào)度和正交碼本聯(lián)合設(shè)計(jì)方案能獲得更高的系統(tǒng)和速率。
[Abstract]:With the increase of system bandwidth and data rate, the rate of mobile network also increases rapidly. Wireless mobile communication is in a period of rapid development, and will enter the 5G era in the near future. 3D MIMO technology, by making full use of space resources, enables base stations to distinguish different users more effectively and improve system performance. Now it has become one of the key technologies in 5G mobile communication. In this paper, the theory of MIMO is introduced, and the transmission model of MIMO is simply analyzed. And focus on three technologies: single-user 3D MIMO precoding, single-user 3D MIMO precoding based on CSI-RS and multi-user scheduling technology. The specific work of this paper is as follows: first, Four typical single-user precoding schemes in 3D MIMO system are studied, which are: precoding scheme based on point multiplication, precoding scheme based on equivalent channel, precoding scheme based on Cronecker product and precoding scheme based on channel transformation. Under the URA antenna array model, the simulation analysis and comparison of the four precoding schemes are carried out. The simulation results show that the system performance of the precoding scheme based on channel conversion is better than that of the other three schemes. Secondly, the precoding scheme based on CSI-RS in single user is studied. Due to the large increase of the number of transmit antennas, but the limited overhead of pilot resources, the available system gain will also be hindered, which will put forward higher requirements for the design of precoding scheme. And in the existing methods, the transmitter often provides a data stream in the vertical direction, which does not effectively improve the system performance. In order to solve the above problems, two precoding schemes based on CSI-RS are proposed. Thirdly, the joint design scheme of multi-user scheduling and orthogonal codebook is studied. firstly, the orthogonal establishment condition based on Kronecker codebook in 3D MIMO system is proved. In order to make full use of the orthogonality between code words, a 3D orthogonal codebook perturbed by Fourier on DFT matrix is proposed, which has a strong suppression effect on the interference between different users in multi-user system. And a corresponding user scheduling scheme is proposed in this paper. The simulation results show that the proposed joint design scheme of multi-user scheduling and orthogonal codebook can obtain higher system and rate.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN919.3;TN929.5

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本文編號(hào)：2474725