下一代无线局域网关键技术研究

发布时间：2018-01-05 01:11

本文关键词：下一代无线局域网关键技术研究　出处：《北京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：无线局域网(Wireless Local Area Network, WLAN)是一种以无线电波作为传输媒介,传输距离一般只有几十米的数据通信系统。无线局域网的出现是为了补充和扩展有线连网方式,使得网络接入方式更加灵活,使数据传输更加便利。随着通信技术的发展,无线局域网也得到了飞速的发展,如多输入多输出、正交频分多址、预编码等通信行业近十年来的优秀技术将无线局域网的性能推升到了一个前所未有的高度。 IEEE802.11作为无线局域网的主流标准,也处于不断更新和完善的状态。由最初的802.11到经典的802.11n到如今的802.11ac和802.11a]1,无线局域网的性能指标已经发生了翻天覆地的变化,无线通信的用户数也已呈爆炸性增长。无线通信业务的进一步发展,对系统的传输速率和传输质量都提出了更高的要求,而对应的无线资源尤其是频谱资源越来越紧张。因此如何利用有限的无线资源完成更加高效且优质的数据传输,正在成为无线局域网未来发展的焦点。本文对当前无线局域网在高密度和超高吞吐两种场景下的最新协议IEEE802.11ah和IEEE802.11ac进行了跟踪研究,并提出了具有一定性能优势的新方案。首先,在原协议方案的基础上添加了预编码技术,降低系统中其他用户或其他天线引入的干扰；然后通过使用旋转调制和分量交织技术,联合提高系统分集增益；最后提出了基于预编码技术的联合编码调制分集方案,相比于原无线局域网方案有较大的性能提升。除此之外,本文通过搭建基于无线局域网协议IEEE802.11ah的MAC层和物理层联合仿真系统,综合考虑仿真了MAC层各种信道监听机制和物理层场景、用户数对系统吞吐的影响,具有前沿的实践意义。
[Abstract]:Wireless LAN (Wireless Local Area Network, WLAN) is a kind of radio waves as the transmission medium, transmission distance is generally only tens of meters of the data communication system. The wireless LAN is to supplement and extension of wired networking, the network access method is more flexible and makes data transmission more convenient. With the development of communication technology, wireless LAN has been rapid development, such as multiple input multiple output orthogonal frequency division multiple access, precoding, communications industry outstanding technology in recent ten years, the performance of wireless LAN push up to a hitherto unknown height.
IEEE802.11 as the mainstream standard of wireless LAN, is constantly updated and improved. From the initial 802.11 to classic 802.11n to today's 802.11ac and 802.11a]1, the performance index of wireless LAN has changed turn the world upside down changes, the number of users of wireless communication has been explosive growth. The further development of wireless communication services, all put forward higher requirements on the transmission rate and quality of the system, and the wireless resources corresponding to the particular spectrum resource becomes more and more nervous. So how to utilize the limited resources to complete data transmission more efficient and high quality, is becoming the focus of the future development of wireless LAN.
This paper studied the process of the current wireless LAN protocol in the latest high density and ultra high throughput two scenarios of IEEE802.11ah and IEEE802.11ac, and proposes a new scheme has certain performance advantages. Firstly, adding pre encoding technology based on the original protocol scheme, reduce the interference introduced by other users or other antenna system; then by using rotating modulation and component interleaving technology, combined with higher diversity gain; finally proposed joint encoding and modulation diversity scheme based on pre encoding technology, compared to the original wireless LAN scheme can significantly improve the performance. In addition, this paper builds the MAC layer and physical layer simulation system of wireless LAN protocol IEEE802.11ah based on considering the simulation of the MAC layer and physical layer channel monitoring mechanism of various scenes, the number of users of the system throughput, with the front edge of the Practical significance.

【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN925.93

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