无线系统中基于自适应编码调制的跨层设计
发布时间：2019-07-04 12:53
【摘要】：随着现代无线通信技术的飞速发展以及人们对无线数据业务需求的快速增长,高速无线数据传输迫切需要开发出能够有效抵抗信道衰落,同时具有高频谱利用率和高可靠性的智能化通信技术。如何折衷考虑无线系统的传输速率与可靠性,提高通信系统在衰落信道中的频谱利用率,成为无线通信技术研究的热点。自适应编码调制(Adaptive Modulation and Coding,AMC)技术以其智能化的传输机制、高效的频谱利用率得到了广泛的关注与研究,成为无线通信系统的关键技术之一。现代通信网络采用OSI(Open System Interconnection)的分层模型,相邻层之间只进行数据的传递,并不交换各层的参数和状态信息。设计者在进行系统各层协议设计时,并不联合考虑相邻层的整体情况,导致设计的系统无法适应快速变化的移动信道特性,不能有效地利用无线频谱资源。为了解决这个问题,跨层设计的思想应运而生。本文重点研究基于AMC的跨层设计方案,在分析研究已有的基于固定阈值AMC跨层方案的基础上,给出了两种改进的最大吞吐量跨层方案和结合链路层重传机制与AMC跨层方案,并对三种跨层方案在丢包率、包损失率和平均频谱效率(Average Spectral Efficiency,ASE)等方面进行理论分析与仿真。仿真结果表明,在链路层数据包泊松到达率较高的情况下,采用改进的最大吞吐量跨层方案的系统包损失率明显低于已有的高可靠性跨层方案;在链路层数据包泊松到达率较低的情况下,改进的结合重传机制与AMC跨层方案能在不影响系统丢包率的同时降低错包率和包损失率,进一步提高系统的吞吐量和平均频谱效率。最后论文给出了在不同最大多普勒频移下,高可靠性跨层方案和改进的最大吞吐量跨层方案的包损失率曲线,验证了设计系统性能的稳定性。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN92
本文编号：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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN92
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