本文選題：干擾對齊 + 發(fā)送端信道狀態(tài)信息��； 參考：《東南大學(xué)》2017年碩士論文

【摘要】：在多用戶多輸入多輸出(Multi-User Multiple-Input Multiple-Output,MU-MIMO)通信系統(tǒng)中,用戶之間的干擾會影響到系統(tǒng)的總體性能。為了消除用戶間干擾,通常會采用正交多址技術(shù),比如頻分多址(Frequency Division Multiple Access,FDMA)和時分多址(Time Division Multiple Access,TDMA),將信道資源分配給各個用戶,這導(dǎo)致信道資源的利用率較低。近年來,干擾對齊(Interference Alignment,IA)這一課題吸引了廣泛的研究興趣。干擾對齊策略使得接收端收到的干擾信號被對齊到較小的信號子空間,同時期望信號仍然可以辨識,最終提高系統(tǒng)的整體自由度(Degrees of Freedom,DoF)。盲干擾對齊(Blind Interference Alignment,BIA)是不需要具備發(fā)送端信道狀態(tài)信息(Channel State Information at the Transmitter,CSIT)即可進(jìn)行的干擾對齊。本文提出了一種應(yīng)用于頻率選擇性信道的半盲干擾對齊策略和一種應(yīng)用于非對稱多小區(qū)多輸入多輸出(Multiple-Input Multiple-Output,MIMO)信道的盲干擾對齊策略。首先,本文對研究背景進(jìn)行了簡單闡述,特別介紹了干擾對齊和盲干擾對齊策略在自由度方面的優(yōu)勢。其次,本文介紹了干擾對齊,半盲干擾對齊,以及盲干擾對齊的基礎(chǔ)理論知識。接著,本文提出了一種應(yīng)用于兩用戶下行頻率選擇性信道的半盲干擾對齊策略。該策略利用了信道的頻率選擇性結(jié)構(gòu),在發(fā)送端不需要具備準(zhǔn)確的信道系數(shù)以及接收端不需要配備可重構(gòu)天線的情況下即可進(jìn)行干擾對齊。與傳統(tǒng)的干擾控制技術(shù)FDMA相比,本文提出的半盲干擾對齊策略可以取得更高的自由度。本文還提出了一種應(yīng)用于非對稱MIMO信道中的盲干擾對齊策略。通過設(shè)計發(fā)送端的發(fā)送方法和在接收端配置可重構(gòu)天線,可以顯著地提高系統(tǒng)的自由度。與傳統(tǒng)的干擾控制技術(shù)TDMA相比,系統(tǒng)的吞吐量獲得明顯提高。此外,在本文提出的兩種策略中,用戶都可以獲得較好的分集增益來抵抗信道衰落。
[Abstract]:In Multi-User Multiple-Input Multiple-Output MU-MIMO (Multi-User Multiple-Input Multiple-Output MU-MIMO) communication systems, interference between users will affect the overall performance of the system. In order to eliminate inter-user interference, orthogonal multiple access techniques, such as Frequency Division multiple access FDMA (FDMA) and time Division multiple access (TDMA), are usually used to allocate channel resources to individual users, which results in low utilization of channel resources. In recent years, the topic of interference alignment (IA) has attracted extensive research interest. The interference alignment strategy allows the received interference signal to be aligned to a smaller signal subspace, while the desired signal can still be identified, thus increasing the degree of freedom (degrees of freedom) of the system. Blind interference alignment (BIA) is a kind of interference alignment that can be performed without channel state information at the transmitter. In this paper, we propose a semi-blind interference alignment strategy for frequency selective channels and a blind interference alignment strategy for asymmetric multi-cell multiple-input multiple-output (MIMO) channels. First of all, this paper briefly describes the research background, especially introduces the advantages of interference alignment and blind interference alignment in degrees of freedom. Secondly, this paper introduces the basic theory of interference alignment, semi-blind interference alignment and blind interference alignment. Then, a semi-blind interference alignment strategy for two users downlink frequency selective channel is proposed. The strategy utilizes the frequency-selective structure of the channel and can be used for interference alignment without the need for accurate channel coefficients at the transmitter and for the receiver to be equipped with a reconfigurable antenna. Compared with the conventional interference control technique FDMA, the proposed semi-blind interference alignment strategy can obtain higher degrees of freedom. This paper also proposes a blind interference alignment strategy for asymmetric MIMO channels. The degree of freedom of the system can be significantly improved by designing the sending method of the transmitter and configuring the reconfigurable antenna at the receiver. Compared with the traditional interference control technology TDMA, the throughput of the system is improved obviously. In addition, in the two strategies proposed in this paper, users can obtain better diversity gain to resist channel fading.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN911.4

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