本文選題：Massive + MIMO�。� 參考：《北京郵電大學(xué)》2015年碩士論文

【摘要】：為滿足下一代移動通信系統(tǒng)對傳輸速率及頻譜效率更高的需求,Massive MIMO技術(shù)作為第五代移動通信關(guān)鍵技術(shù)受到了廣泛的關(guān)注。Massive MIMO技術(shù)即在傳統(tǒng)MIMO技術(shù)的收發(fā)兩端配置更多的天線數(shù)目,利用天線數(shù)目的優(yōu)勢,在相同的時頻資源上同時服務(wù)多個用戶,以獲得更高的空間服用增益、頻譜效率及系統(tǒng)魯棒性。 本論文主要針對多用戶Massive MIMO場景下的收發(fā)技術(shù)方案進(jìn)行了研究。在已有的Massive MIMO系統(tǒng)的研究通常采用TDD雙工模式,利用信道互易性降低CSI獲取的資源消耗量,然而對于FDD雙工模式研究的較少,主要原因在于隨著發(fā)射端天線數(shù)目的增加,FDD系統(tǒng)中需要更多的CSI,而系統(tǒng)中利用導(dǎo)頻輔助的CSI獲取方式將消耗大量的系統(tǒng)資源。基于以上背景,本論文針對多用戶Massive MIMO系統(tǒng)FDD雙工模式下的應(yīng)用問題,通過研究分析Massive MIMO系統(tǒng)中的收發(fā)技術(shù)及空間相關(guān)性,提出了一種基于空間相關(guān)性的Massive MIMO下行分組傳輸方案。 本論文所提出的下行分組傳輸方案,主要思想是利用相似的空間相關(guān)性對用戶進(jìn)行分組,然后在每一組內(nèi)進(jìn)行用戶調(diào)度及多用戶預(yù)編碼。該方案采用兩階段預(yù)編碼策略,第一階段為預(yù)處理,利用系統(tǒng)信道二階統(tǒng)計信息進(jìn)行矩陣設(shè)計；第二階段為多用戶預(yù)編碼,利用經(jīng)過預(yù)處理的等效信道矩陣進(jìn)行設(shè)計。通過在傳統(tǒng)多用戶預(yù)編碼之間串聯(lián)預(yù)處理矩陣,可以有效地降低等效信道矩陣的維度,減少系統(tǒng)傳輸所必須的CSI。此外,當(dāng)天線數(shù)目有限時,需要對不同用戶組中用戶進(jìn)行調(diào)度,本論文還提出了一種聯(lián)合隨機(jī)波束賦形及半正交化用戶調(diào)度的用戶選擇方案。最后本論文利用Matlab軟件進(jìn)行了方案性能分析,性能分析驗證了本下行分組傳輸方案,在系統(tǒng)容量損失較小的情況下,極大地降低了系統(tǒng)傳輸所需的信息反饋量。
[Abstract]:In order to meet the demand of the next generation mobile communication system for higher transmission rate and higher spectral efficiency, passive MIMO technology, as the key technology of the fifth generation mobile communication, has received extensive attention. The passive MIMO technology is configured at both ends of the traditional MIMO technology. More antennas, Taking advantage of the number of antennas, multiple users are simultaneously served on the same time-frequency resources to achieve higher spatial access gain, spectral efficiency and system robustness. In this thesis, the transceiver scheme of multi-user passive MIMO scene is studied. In existing passive MIMO systems, TDD duplex mode is usually used to reduce the resource consumption obtained by CSI by using channel reciprocity. However, the FDD duplex mode is seldom studied. The main reason is that more CSI is needed in the FDD system with the increase of the number of antennas at the transmitter, and a large amount of system resources will be consumed by the pilot-assisted CSI acquisition method in the system. Based on the above background, this thesis aims at the application of FDD duplex mode in multi-user passive MIMO system, and analyzes the transceiver technology and spatial correlation of passive MIMO system. A scheme of passive MIMO downlink packet transmission based on spatial correlation is proposed. The main idea of the downlink packet transmission scheme proposed in this paper is to use similar spatial correlation to group users and then to schedule users and precode users in each group. The scheme adopts two-stage precoding strategy, the first stage is pre-processing, the second stage is multi-user pre-coding, and the second stage is multi-user pre-coding, using the pre-processed equivalent channel matrix to design the matrix. The dimension of the equivalent channel matrix can be effectively reduced and the CSIs necessary for the transmission of the system can be reduced by using the series preprocessing matrix between the traditional multi-user precoding systems. In addition, when the number of antennas is limited, users in different user groups need to be scheduled. In this paper, a user selection scheme for joint random beamforming and semi-orthogonal user scheduling is proposed. Finally, the performance analysis of the scheme is carried out by using Matlab software. The performance analysis verifies the scheme of downlink packet transmission, which greatly reduces the amount of information feedback needed by the system when the capacity loss of the system is small.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN919.3

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相關(guān)期刊論文 前1條

1 周杰;陳靖峰;邱琳;菊池久和;;三維空間MIMO信道接收天線陣列互耦效應(yīng)及系統(tǒng)容量分析[J];通信學(xué)報;2012年06期

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本文編號：2059231