本文選題：MIMO + 跨層設計��； 參考：《南京航空航天大學》2014年碩士論文

【摘要】：多輸入多輸出(MIMO)技術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用增益,進一步提高整個系統(tǒng)的頻譜利用率和可靠性。跨層設計(CLD)通過網(wǎng)絡各層間交互信息進行統(tǒng)一協(xié)調,從而實現(xiàn)網(wǎng)絡資源的合理有效分配。因此,針對MIMO系統(tǒng)提出了聯(lián)合物理層自適應調制(AM)和數(shù)據(jù)鏈路層自動重傳請求(ARQ)的多用戶跨層設計方案。本文針對實際場景中用戶的統(tǒng)計特性是獨立非同分布的,以及發(fā)送端天線存在空間相關性,研究空間相關信道下異構多用戶MIMO基于不完全信道估計的跨層設計性能,為提高跨層設計的實用性提供必要的理論依據(jù)。全文的主要工作安排如下:1、研究異構多用戶MIMO系統(tǒng)基于公平調度的跨層設計。在實際的通信中,用戶的信噪比的統(tǒng)計特性是獨立非同分布的,傳統(tǒng)的調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、自適應調制、自動重傳請求及比例公平調度的多用戶MIMO跨層設計方案。該方案可以在保證小區(qū)內所有用戶被公平調度的前提下,充分利用多用戶分集提高系統(tǒng)性能。2、研究空間相關信道下異構多用戶MIMO系統(tǒng)跨層設計。在實際的無線通信環(huán)境中,由于發(fā)射機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立,而是存在著空間相關性�；诖�,提出一種空間相關信道下異構多用戶MIMO跨層設計方案,并對系統(tǒng)性能進行了分析,仿真結果驗證了理論分析的正確性。3、研究基于不完信道估計信息的異構多用戶MIMO系統(tǒng)跨層設計。針對信息反饋鏈路的不穩(wěn)定或者接收端信道有估計錯誤等因素,接收端獲得的信息是不完全的,提出研究信道估計錯誤對跨層設計系統(tǒng)性能的影響,并推導了系統(tǒng)平均頻譜效率(ASE)和平均誤包率(PER),為提高跨層設計的實用性提供理論依據(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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3
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本文編號：1809408