【摘要】：無(wú)線通信在人們的生活中幾乎無(wú)處不在。Wifi在人類生活中更是扮演著不可替代的角色。2004年,IEEE802.11n標(biāo)準(zhǔn)中加入了MIMO技術(shù)。在MIMO技術(shù)中,接收信號(hào)的檢測(cè)技術(shù),是衡量通信系統(tǒng)性能的重要指標(biāo)。而良好的通信系統(tǒng)性能要求檢測(cè)算法具有計(jì)算復(fù)雜度低且誤碼率性能好的特點(diǎn)。所以如何對(duì)MIMO接收信號(hào)進(jìn)行檢測(cè),并且怎樣對(duì)檢測(cè)算法的性能進(jìn)行提升變得尤為重要。在IEEE802.11標(biāo)準(zhǔn)中,另一個(gè)影響無(wú)線局域網(wǎng)性能的重要因素就是接入技術(shù)。因此接入技術(shù)的研究對(duì)無(wú)線網(wǎng)絡(luò)性能的提升起著關(guān)鍵性的作用。本文首先針對(duì)MIMO檢測(cè)算法,先詳細(xì)介紹了已有的幾種基本MIMO檢測(cè)算法,對(duì)文獻(xiàn)中已有的基于SIC的多反饋MIMO檢測(cè)算法進(jìn)行了分析和仿真。在多反饋算法中使用陰影區(qū)域約束,干擾消除中通過(guò)引入星座點(diǎn)作為解決判決來(lái)解決反饋環(huán)路中的誤差傳播問(wèn)題。在多反饋算法地基礎(chǔ)上,研究了一種多反饋改進(jìn)算法,算法使用了遞歸的方法,減少了誤差傳播,提高了誤碼性能。其次針對(duì)多用戶接入技術(shù),研究了多用戶MIMO接入方案,對(duì)方案進(jìn)行了理論分析。對(duì)相應(yīng)的控制幀進(jìn)行改進(jìn),使用基于馬爾科夫鏈的分析模型來(lái)評(píng)估所提出的方案的性能。結(jié)果顯示系統(tǒng)性能明顯優(yōu)于單用戶傳輸。在CSMA/CA的基礎(chǔ)上,研究了一種異步多用戶接入方案。方案允許一個(gè)信道下同時(shí)接入多個(gè)用戶,并對(duì)涉及到的幀格式進(jìn)行了改進(jìn),詳細(xì)闡述了方案的流程并對(duì)吞吐量性能進(jìn)行了仿真。對(duì)比了異步多用戶接入方案和多用戶MIMO接入方案的吞吐量性能,結(jié)果顯示異步接入方案的性能要優(yōu)于上行多用戶MIMO傳輸方案。
[Abstract]:Wireless communication is almost everywhere in human life. Wifi plays an irreplaceable role in human life. In 2004, IEEE 802.11n standard added MIMO technology. In MIMO technology, the detection technology of received signal is an important index to measure the performance of communication system. The good performance of communication system requires that the detection algorithm has the characteristics of low computational complexity and good bit error rate (BER) performance. So how to detect the received signals of MIMO and how to improve the performance of the detection algorithm become more important. In the IEEE802.11 standard, another important factor affecting the performance of WLAN is access technology. Therefore, the research of access technology plays a key role in improving the performance of wireless networks. In this paper, several basic MIMO detection algorithms are introduced in detail for MIMO detection algorithms, and the existing multi-feedback MIMO detection algorithms based on SIC in literature are analyzed and simulated. Shadow region constraints are used in multi-feedback algorithms, and constellation points are introduced to solve the error propagation problem in feedback loop in interference cancellation. On the basis of multi-feedback algorithm, a multi-feedback improved algorithm is studied, which uses recursive method to reduce error propagation and improve error performance. Secondly, the multi-user MIMO access scheme is studied, and the scheme is analyzed theoretically. The corresponding control frame is improved to evaluate the performance of the proposed scheme using Markov chain based analysis model. The results show that the performance of the system is better than that of single user transmission. Based on CSMA/CA, an asynchronous multi-user access scheme is studied. The scheme allows multiple users to be accessed simultaneously in a single channel and improves the frame format involved. The flow of the scheme is described in detail and the throughput performance is simulated. The throughput performance of asynchronous multi-user access scheme and multi-user MIMO access scheme is compared. The results show that the performance of asynchronous access scheme is better than that of uplink multi-user MIMO transmission scheme.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN919.3;TN92

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本文編號(hào)：2180361