本文選題：大規(guī)模MIMO　切入點(diǎn)：單位預(yù)編碼　出處：《華僑大學(xué)》2014年碩士論文

【摘要】：隨著用戶需求的不斷提高，高速率、高質(zhì)量的通信系統(tǒng)是新一代移動(dòng)通信技術(shù)的研究目標(biāo)。以多輸入多輸出（Multiple Input Multiple Output, MIMO）為代表的多天線技術(shù)是目前公認(rèn)的實(shí)現(xiàn)上述目標(biāo)的最佳途徑。然而在實(shí)際系統(tǒng)中，由于嚴(yán)重的小區(qū)間干擾和更高的數(shù)據(jù)傳輸要求，人們的研究焦點(diǎn)開(kāi)始轉(zhuǎn)向大規(guī)模MIMO技術(shù)，即在基站端采用大規(guī)模天線陣列（天線數(shù)超過(guò)十根，甚至上百根），且在同一時(shí)頻資源內(nèi)服務(wù)多個(gè)用戶的多天線技術(shù)。與傳統(tǒng)MIMO技術(shù)相比，該技術(shù)不僅可以顯著提高系統(tǒng)頻譜效率、改善通信質(zhì)量，而且可以有效降低干擾消除的復(fù)雜度及基站發(fā)送功率。 本文研究了大規(guī)模MIMO技術(shù)的頻譜效率、能量效率，及其應(yīng)用于異構(gòu)網(wǎng)絡(luò)時(shí)的系統(tǒng)性能。首先，運(yùn)用隨機(jī)矩陣?yán)碚摚謩e研究了大規(guī)模MIMO技術(shù)在單小區(qū)、多小區(qū)下行鏈路系統(tǒng)中，，當(dāng)天線數(shù)趨于無(wú)窮大時(shí)，最大比傳輸（MRT）和迫零（ZF）單位預(yù)編碼的極限性能，以及系統(tǒng)頻譜效率的閉合表達(dá)式。其次，通過(guò)理論推導(dǎo)和MATLAB仿真，分析了兩種預(yù)編碼能量效率與天線數(shù)及發(fā)送功率的關(guān)系。最后，通過(guò)對(duì)比三種不同雙工方式，給出大規(guī)模MIMO技術(shù)應(yīng)用于異構(gòu)網(wǎng)絡(luò)時(shí)的性能分析。 研究結(jié)果表明：（1）在基站已知完全信道狀態(tài)信息（CSI）的條件下，當(dāng)基站發(fā)送功率減小到單天線基站的1M時(shí)，隨著基站天線數(shù)M的無(wú)限增加，系統(tǒng)頻譜效率趨于恒定，并且MRT單位預(yù)編碼的極限表達(dá)式與ZF單位預(yù)編碼相同。因此基站可以采用簡(jiǎn)單的MRT預(yù)處理來(lái)消除用戶間、小區(qū)間干擾以及快衰落影響。（2）當(dāng)基站已知有限CSI時(shí)，小區(qū)間干擾因受CSI估計(jì)的影響不能完全消除，但隨著發(fā)送功率的降低，系統(tǒng)將由干擾受限轉(zhuǎn)變?yōu)樵肼暿芟蕖＃?）系統(tǒng)能量效率隨天線數(shù)的增加逐漸提高，而隨發(fā)送功率的增加逐漸減小，因此大規(guī)模MIMO技術(shù)可以通過(guò)增加天線數(shù)、降低發(fā)送功率來(lái)提高能量效率。（4）在異構(gòu)網(wǎng)絡(luò)中，當(dāng)宏蜂窩采用傳統(tǒng)多天線技術(shù)、微蜂窩采用大規(guī)模MIMO技術(shù)，并且系統(tǒng)采用頻段分離的TDD工作方式時(shí)，系統(tǒng)不僅可以滿足下一代移動(dòng)通信系統(tǒng)中高速率通信需求，還可以有效避免異構(gòu)網(wǎng)絡(luò)中的小區(qū)間干擾。
[Abstract]:With the increasing demand of users, high speed, High quality communication system is the research goal of the new generation mobile communication technology. Multi-antenna technology, represented by multiple Input Multiple output (Mimo), is the best way to achieve the above goal. Due to severe inter-cell interference and higher data transmission requirements, the focus of research has turned to large-scale MIMO technology, that is, the use of large-scale antenna arrays (more than ten antennas) at base stations. Compared with traditional MIMO technology, this technology can not only improve the spectrum efficiency of the system, but also improve the communication quality. Moreover, it can effectively reduce the complexity of interference cancellation and the transmission power of the base station. In this paper, the spectrum efficiency, energy efficiency, and system performance of large-scale MIMO technology are studied. Firstly, using the stochastic matrix theory, we study the large scale MIMO technology in a single cell. In a multi-cell downlink system, when the number of antennas tends to infinity, the ultimate performance of the unit precoding and the closed expression of the spectral efficiency of the system are obtained. Secondly, through theoretical derivation and MATLAB simulation, The relationship between two kinds of precoding energy efficiency and antenna number and transmission power is analyzed. Finally, by comparing three different duplex modes, the performance analysis of large-scale MIMO technology applied to heterogeneous networks is presented. The results show that when the transmission power of the base station decreases to 1m of the single antenna base station under the condition that the base station has known complete channel state information (CSI), with the infinite increase of the number of base station antennas, the spectral efficiency of the system tends to be constant. And the limit expression of MRT unit precoding is the same as that of ZF unit precoding. Therefore, the base station can use simple MRT pretreatment to eliminate inter-user, inter-cell interference and fast fading effect. Due to the influence of CSI estimation, the inter-cell interference can not be completely eliminated, but with the decrease of transmission power, the system energy efficiency will be gradually improved with the increase of the number of antennas. However, with the increase of transmission power, the energy efficiency of large-scale MIMO can be improved by increasing the number of antennas and reducing the transmission power. When the microcellular uses large-scale MIMO technology and the system adopts the frequency band separation TDD operation mode, the system can not only meet the high rate communication demand in the next generation mobile communication system, but also can effectively avoid the inter-cell interference in the heterogeneous network.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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