無(wú)線系統(tǒng)中基于自適應(yīng)編碼調(diào)制的跨層設(shè)計(jì)
發(fā)布時(shí)間：2019-07-04 12:53
【摘要】：隨著現(xiàn)代無(wú)線通信技術(shù)的飛速發(fā)展以及人們對(duì)無(wú)線數(shù)據(jù)業(yè)務(wù)需求的快速增長(zhǎng),高速無(wú)線數(shù)據(jù)傳輸迫切需要開(kāi)發(fā)出能夠有效抵抗信道衰落,同時(shí)具有高頻譜利用率和高可靠性的智能化通信技術(shù)。如何折衷考慮無(wú)線系統(tǒng)的傳輸速率與可靠性,提高通信系統(tǒng)在衰落信道中的頻譜利用率,成為無(wú)線通信技術(shù)研究的熱點(diǎn)。自適應(yīng)編碼調(diào)制(Adaptive Modulation and Coding,AMC)技術(shù)以其智能化的傳輸機(jī)制、高效的頻譜利用率得到了廣泛的關(guān)注與研究,成為無(wú)線通信系統(tǒng)的關(guān)鍵技術(shù)之一�，F(xiàn)代通信網(wǎng)絡(luò)采用OSI(Open System Interconnection)的分層模型,相鄰層之間只進(jìn)行數(shù)據(jù)的傳遞,并不交換各層的參數(shù)和狀態(tài)信息。設(shè)計(jì)者在進(jìn)行系統(tǒng)各層協(xié)議設(shè)計(jì)時(shí),并不聯(lián)合考慮相鄰層的整體情況,導(dǎo)致設(shè)計(jì)的系統(tǒng)無(wú)法適應(yīng)快速變化的移動(dòng)信道特性,不能有效地利用無(wú)線頻譜資源。為了解決這個(gè)問(wèn)題,跨層設(shè)計(jì)的思想應(yīng)運(yùn)而生。本文重點(diǎn)研究基于AMC的跨層設(shè)計(jì)方案,在分析研究已有的基于固定閾值A(chǔ)MC跨層方案的基礎(chǔ)上,給出了兩種改進(jìn)的最大吞吐量跨層方案和結(jié)合鏈路層重傳機(jī)制與AMC跨層方案,并對(duì)三種跨層方案在丟包率、包損失率和平均頻譜效率(Average Spectral Efficiency,ASE)等方面進(jìn)行理論分析與仿真。仿真結(jié)果表明,在鏈路層數(shù)據(jù)包泊松到達(dá)率較高的情況下,采用改進(jìn)的最大吞吐量跨層方案的系統(tǒng)包損失率明顯低于已有的高可靠性跨層方案;在鏈路層數(shù)據(jù)包泊松到達(dá)率較低的情況下,改進(jìn)的結(jié)合重傳機(jī)制與AMC跨層方案能在不影響系統(tǒng)丟包率的同時(shí)降低錯(cuò)包率和包損失率,進(jìn)一步提高系統(tǒng)的吞吐量和平均頻譜效率。最后論文給出了在不同最大多普勒頻移下,高可靠性跨層方案和改進(jìn)的最大吞吐量跨層方案的包損失率曲線,驗(yàn)證了設(shè)計(jì)系統(tǒng)性能的穩(wěn)定性。
[Abstract]:With the rapid development of modern wireless communication technology and the rapid growth of people's demand for wireless data services, high-speed wireless data transmission urgently needs to develop intelligent communication technology which can effectively resist channel fading, and has high spectrum efficiency and high reliability. How to compromise the transmission rate and reliability of wireless system and improve the spectrum efficiency of communication system in fading channel has become the focus of wireless communication technology research. Adaptive coded Modulation (Adaptive Modulation and Coding,AMC) technology has been widely concerned and studied because of its intelligent transmission mechanism and efficient spectrum efficiency, and has become one of the key technologies of wireless communication system. The modern communication network adopts the hierarchical model of OSI (Open System Interconnection), which only transmits the data between adjacent layers and does not exchange the parameters and state information of each layer. When the designers design the protocols of each layer of the system, they do not consider the whole situation of the adjacent layers, which leads to the design of the system can not adapt to the rapidly changing mobile channel characteristics, and can not make effective use of wireless spectrum resources. In order to solve this problem, the idea of cross-layer design emerges as the times require. This paper focuses on the cross-layer design scheme based on AMC. On the basis of analyzing and studying the existing cross-layer schemes based on fixed threshold AMC, two improved maximum throughput cross-layer schemes and the combination of link layer retransmission mechanism and AMC cross-layer scheme are proposed, and the theoretical analysis and simulation of the three cross-layer schemes in terms of packet loss rate, packet loss rate and average spectral efficiency (Average Spectral Efficiency,ASE are carried out. The simulation results show that the system packet loss rate of the improved maximum throughput cross-layer scheme is obviously lower than that of the existing high reliability cross-layer schemes when the Poisson arrival rate of the link layer data packet is high. Under the condition that the Poisson arrival rate of link layer packets is low, the improved combined retransmission mechanism and AMC cross-layer scheme can reduce the packet error rate and packet loss rate without affecting the packet loss rate of the system, and further improve the throughput and average spectral efficiency of the system. Finally, the packet loss rate curves of the high reliability cross-layer scheme and the improved maximum throughput cross-layer scheme are given under different maximum Doppler frequency shifts, and the stability of the design system performance is verified.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN92
本文編號(hào)：2509930
[Abstract]:With the rapid development of modern wireless communication technology and the rapid growth of people's demand for wireless data services, high-speed wireless data transmission urgently needs to develop intelligent communication technology which can effectively resist channel fading, and has high spectrum efficiency and high reliability. How to compromise the transmission rate and reliability of wireless system and improve the spectrum efficiency of communication system in fading channel has become the focus of wireless communication technology research. Adaptive coded Modulation (Adaptive Modulation and Coding,AMC) technology has been widely concerned and studied because of its intelligent transmission mechanism and efficient spectrum efficiency, and has become one of the key technologies of wireless communication system. The modern communication network adopts the hierarchical model of OSI (Open System Interconnection), which only transmits the data between adjacent layers and does not exchange the parameters and state information of each layer. When the designers design the protocols of each layer of the system, they do not consider the whole situation of the adjacent layers, which leads to the design of the system can not adapt to the rapidly changing mobile channel characteristics, and can not make effective use of wireless spectrum resources. In order to solve this problem, the idea of cross-layer design emerges as the times require. This paper focuses on the cross-layer design scheme based on AMC. On the basis of analyzing and studying the existing cross-layer schemes based on fixed threshold AMC, two improved maximum throughput cross-layer schemes and the combination of link layer retransmission mechanism and AMC cross-layer scheme are proposed, and the theoretical analysis and simulation of the three cross-layer schemes in terms of packet loss rate, packet loss rate and average spectral efficiency (Average Spectral Efficiency,ASE are carried out. The simulation results show that the system packet loss rate of the improved maximum throughput cross-layer scheme is obviously lower than that of the existing high reliability cross-layer schemes when the Poisson arrival rate of the link layer data packet is high. Under the condition that the Poisson arrival rate of link layer packets is low, the improved combined retransmission mechanism and AMC cross-layer scheme can reduce the packet error rate and packet loss rate without affecting the packet loss rate of the system, and further improve the throughput and average spectral efficiency of the system. Finally, the packet loss rate curves of the high reliability cross-layer scheme and the improved maximum throughput cross-layer scheme are given under different maximum Doppler frequency shifts, and the stability of the design system performance is verified.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN92
【參考文獻(xiàn)】
相關(guān)期刊論文 前7條
1 祁長(zhǎng)利;;論信道編碼與網(wǎng)絡(luò)編碼在現(xiàn)代通信系統(tǒng)中的應(yīng)用[J];無(wú)線互聯(lián)科技;2015年04期
2 許從方;叢鍵;;超短波電臺(tái)信道模型的仿真研究[J];通信技術(shù);2014年07期
3 黎潔;劉羽西;李奇越;;基于隱馬爾可夫模型的認(rèn)知無(wú)線頻譜切換方法[J];電子測(cè)量與儀器學(xué)報(bào);2014年01期
4 房曙光;董育寧;王再見(jiàn);張健;;自適應(yīng)調(diào)制編碼無(wú)線信道突發(fā)特性等效建模[J];南京郵電大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年04期
5 周坡;曹志剛;;基于馬爾可夫過(guò)程的衛(wèi)星移動(dòng)信道模型及長(zhǎng)期預(yù)測(cè)方法[J];電子與信息學(xué)報(bào);2011年12期
6 陳婷;李建東;李長(zhǎng)樂(lè);;WiMAX中基于跨層設(shè)計(jì)的SNR閾值區(qū)間可變式自適應(yīng)調(diào)制編碼機(jī)制[J];中國(guó)通信;2010年02期
7 吳軍力,滕勇,尹長(zhǎng)川,樂(lè)光新;自適應(yīng)技術(shù)在后3G中的應(yīng)用[J];現(xiàn)代電信科技;2003年10期
，本文編號(hào)：2509930
本文鏈接：http://sikaile.net/kejilunwen/wltx/2509930.html
最近更新
教材專著
