本文選題：三維多入多出　切入點：聯(lián)合傳輸　出處：《華北電力大學(xué)》2017年碩士論文

【摘要】：三維多入多出(3D Multiple Input Multiple Output,3D MIMO)技術(shù)作為第五代移動通信關(guān)鍵技術(shù)之一,受到了越來越多的關(guān)注。與傳統(tǒng)的MIMO技術(shù)相比,3D MIMO能充分利用垂直維度的空間自由度,提升無線通信系統(tǒng)的傳輸性能,并能進(jìn)一步降低小區(qū)間干擾,提高頻譜效率。目前對多小區(qū)3D MIMO系統(tǒng)的研究還比較少,小區(qū)間的干擾問題是需要解決的一個難點。將多小區(qū)聯(lián)合傳輸技術(shù)和3D波束成形技術(shù)應(yīng)用于3D MIMO系統(tǒng)中,通過基站間的協(xié)作消除小區(qū)間的干擾,能夠提高系統(tǒng)的頻譜效率和能源效率。本文首先介紹了3D MIMO系統(tǒng)及其信道模型的建立,針對小區(qū)間的干擾問題,引出了3D MIMO聯(lián)合傳輸技術(shù)。通過研究下行3D MIMO系統(tǒng),采用迫零波束成形算法,并結(jié)合多小區(qū)聯(lián)合傳輸方案,分析了基站天線下傾角、用戶與基站之間的距離以及小區(qū)中的用戶數(shù)對系統(tǒng)傳輸速率的影響。仿真結(jié)果表明,多小區(qū)聯(lián)合傳輸相比于單小區(qū)傳輸在提高系統(tǒng)吞吐量方面具有更優(yōu)的性能。其次,考慮到3D MIMO系統(tǒng)中較大的信息交互量,針對有限數(shù)目的反饋比特數(shù)如何在水平維度和垂直維度進(jìn)行合理的分配,建立了以最小化有限反饋與理想反饋間SINR的差值為目標(biāo)的優(yōu)化模型,并結(jié)合對水平維度和垂直維度信道增益比值的分析,給出了特定天線配置和固定反饋比特數(shù)目條件下的最優(yōu)比特分配結(jié)果。最后,在所構(gòu)建的3D MIMO系統(tǒng)仿真環(huán)境下,針對多小區(qū)協(xié)作的場景,利用3D波束成形技術(shù)提高了用戶接收到的有用信號的功率,并采用能效功率控制方法有效地抑制了小區(qū)間的干擾,提高了系統(tǒng)能源效率。通過仿真表明,基于3D波束成形方法的能效功率控制方案在提升系統(tǒng)性能方面具有很大的優(yōu)越性。
[Abstract]:As one of the key technologies of the fifth generation mobile communication, 3D Multiple Input Multiple output 3D Mimo (3D MMI) technology has attracted more and more attention.Compared with traditional MIMO technology, 3D MIMO can make full use of the spatial degree of freedom of vertical dimension, improve the transmission performance of wireless communication system, further reduce inter-cell interference and improve spectral efficiency.At present, there are few researches on multi-cell 3D MIMO system, and intercellular interference is a difficult problem to be solved.Multi-cell joint transmission technology and 3D beamforming technology are applied to 3D MIMO system. The spectral efficiency and energy efficiency of the system can be improved by eliminating intercellular interference through the cooperation between base stations.In this paper, the establishment of 3D MIMO system and its channel model is introduced firstly. Aiming at the intercellular interference, the 3D MIMO joint transmission technology is introduced.By studying the downlink 3D MIMO system, using zero-forcing beamforming algorithm and combining with the multi-cell joint transmission scheme, the influence of the base station antenna downdip angle, the distance between the user and the base station and the number of users in the cell on the transmission rate of the system are analyzed.The simulation results show that multi-cell joint transmission has better performance than single-cell transmission in improving system throughput.Secondly, considering the large amount of information exchange in 3D MIMO system, how to allocate the finite number of feedback bits in horizontal dimension and vertical dimension is reasonable.An optimization model with the objective of minimizing the difference between finite feedback and ideal feedback is established, and the channel gain ratio between horizontal dimension and vertical dimension is analyzed.The optimal bit allocation results for a given antenna configuration and a fixed number of feedback bits are given.Finally, in the simulation environment of 3D MIMO system, 3D beamforming technology is used to improve the power of the useful signals received by the user.The energy efficiency power control method is used to effectively suppress the interference between the cells and improve the energy efficiency of the system.Simulation results show that the energy efficiency power control scheme based on 3D beamforming has great advantages in improving system performance.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.3

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