本文選題：MIMO + 跨層設(shè)計(jì)��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：多輸入多輸出(MIMO)技術(shù)能夠在不增加帶寬的條件下極大地提高鏈路健壯性、系統(tǒng)容量和頻譜效率,因而得到廣泛的關(guān)注。與單用戶MIMO相比,多用戶MIMO能夠充分利用多用戶分集增益和復(fù)用增益,進(jìn)一步提高整個(gè)系統(tǒng)的頻譜利用率和可靠性。跨層設(shè)計(jì)(CLD)通過網(wǎng)絡(luò)各層間交互信息進(jìn)行統(tǒng)一協(xié)調(diào),從而實(shí)現(xiàn)網(wǎng)絡(luò)資源的合理有效分配。因此,針對(duì)MIMO系統(tǒng)提出了聯(lián)合物理層自適應(yīng)調(diào)制(AM)和數(shù)據(jù)鏈路層自動(dòng)重傳請求(ARQ)的多用戶跨層設(shè)計(jì)方案。本文針對(duì)實(shí)際場景中用戶的統(tǒng)計(jì)特性是獨(dú)立非同分布的,以及發(fā)送端天線存在空間相關(guān)性,研究空間相關(guān)信道下異構(gòu)多用戶MIMO基于不完全信道估計(jì)的跨層設(shè)計(jì)性能,為提高跨層設(shè)計(jì)的實(shí)用性提供必要的理論依據(jù)。全文的主要工作安排如下:1、研究異構(gòu)多用戶MIMO系統(tǒng)基于公平調(diào)度的跨層設(shè)計(jì)。在實(shí)際的通信中,用戶的信噪比的統(tǒng)計(jì)特性是獨(dú)立非同分布的,傳統(tǒng)的調(diào)度策略不能保證用戶間的公平性,為此提出一種聯(lián)合發(fā)送天線選擇、自適應(yīng)調(diào)制、自動(dòng)重傳請求及比例公平調(diào)度的多用戶MIMO跨層設(shè)計(jì)方案。該方案可以在保證小區(qū)內(nèi)所有用戶被公平調(diào)度的前提下,充分利用多用戶分集提高系統(tǒng)性能。2、研究空間相關(guān)信道下異構(gòu)多用戶MIMO系統(tǒng)跨層設(shè)計(jì)。在實(shí)際的無線通信環(huán)境中,由于發(fā)射機(jī)天線尺寸的限制或散射體不夠豐富等原因,MIMO無線信道不再相互獨(dú)立,而是存在著空間相關(guān)性�；诖�,提出一種空間相關(guān)信道下異構(gòu)多用戶MIMO跨層設(shè)計(jì)方案,并對(duì)系統(tǒng)性能進(jìn)行了分析,仿真結(jié)果驗(yàn)證了理論分析的正確性。3、研究基于不完信道估計(jì)信息的異構(gòu)多用戶MIMO系統(tǒng)跨層設(shè)計(jì)。針對(duì)信息反饋鏈路的不穩(wěn)定或者接收端信道有估計(jì)錯(cuò)誤等因素,接收端獲得的信息是不完全的,提出研究信道估計(jì)錯(cuò)誤對(duì)跨層設(shè)計(jì)系統(tǒng)性能的影響,并推導(dǎo)了系統(tǒng)平均頻譜效率(ASE)和平均誤包率(PER),為提高跨層設(shè)計(jì)的實(shí)用性提供理論依據(jù)。
[Abstract]:Multi-Input-Multiple-Output (MIMO) technology can greatly improve link robustness, system capacity and spectral efficiency without increasing bandwidth, so it has attracted wide attention. Compared with single user MIMO, multiuser MIMO can make full use of multiuser diversity gain and multiplexing gain, and further improve the spectrum efficiency and reliability of the whole system. Cross-layer design (CLD) coordinates the interactive information among different layers of the network to realize the rational and effective allocation of network resources. Therefore, a multi-user cross-layer design scheme for MIMO systems is proposed, which is based on the combination of physical layer adaptive modulation (AM) and data link layer automatic retransmission request (ARQ). In this paper, the cross-layer design performance of heterogeneous multi-user MIMO based on incomplete channel estimation is studied in view of the fact that the statistical characteristics of users are independent and heterogeneous, and the antenna at the transmitter has spatial correlation. It provides the necessary theoretical basis for improving the practicability of cross-layer design. The main work of this paper is as follows: 1. The cross-layer design of heterogeneous multi-user MIMO systems based on fair scheduling is studied. In practical communication, the statistical characteristics of the signal-to-noise ratio (SNR) of users are independent and heterogeneous, and the traditional scheduling strategy can not guarantee the fairness between users. Therefore, a joint transmit antenna selection, adaptive modulation, is proposed. Multi-user MIMO cross-layer design for automatic retransmission request and proportional fair scheduling. This scheme can make full use of multi-user diversity to improve the performance of the system, and study the cross-layer design of heterogeneous multi-user MIMO system in spatially correlated channels on the premise that all users in the cell are fairly scheduled. In the actual wireless communication environment, due to the limitation of transmitter antenna size or the lack of abundant scatterers, MIMO wireless channels are no longer independent of each other, but have spatial correlation. Based on this, a cross-layer design scheme of heterogeneous multi-user MIMO in spatial correlation channel is proposed, and the performance of the system is analyzed. The simulation results verify the correctness of the theoretical analysis. The cross-layer design of heterogeneous multi-user MIMO systems based on channel estimation information is studied. Considering the instability of the information feedback link or the error in the channel estimation of the receiver, the information obtained by the receiver is incomplete. This paper studies the influence of the channel estimation error on the performance of the cross-layer design system. The system average spectral efficiency (ASE) and the average packet error rate (per) are derived, which provides a theoretical basis for improving the practicability of cross-layer design.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN919.3
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本文編號(hào)：1809408