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无线接入是未来通信网络非常重要的接入方式。 基于Wi-Fi标准的无线局域网技术，由于其可移动、易安装、组网灵活、成本低等优点，已成为目前最为重要的无线接入技术之一，引起了研究者的广泛关注。 该文首先分析了Wi-Fi标准的研究背景、现状及意义，研究了网络建立的参考模型和体系结构。之后详细探讨了Wi-Fi标准物理层实现原理及媒体访问控制(medium access control, MAC)层的控制机制。在Linux下采用C++搭建了物理层仿真环境，针对加扰、解扰、卷积编码、Viterbi解码、交织、解交织、OFDM调制、解调等过程进行了仿真研究，并对得出的性能曲线图进行分析。最后，基于物理层的仿真结果，对在独立基础服务集中采用分布式协调功能的信标(BEACON)信令的传输与接收进行了仿真，分析其搜索邻居站点的性能。8956
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关键词 Wi-Fi 标准 OFDM 物理层 信标信令 C++ Title
Research and Implementation of physical layer and Beacon Signal of Wi-Fi Standards
Abstract
Wireless access is an extremely important access method in future
communication networks. Wireless local area network (WLAN) based on Wi-Fi
Standards has become one of the most important wireless access technologies
due to its remarkable properties, such as removable, easy-to-install,
flexible networking, low cost and so on, and attracted great amounts of
research interests.
Based on the analysis of the research background, status and significance
of Wi-Fi Standards, reference networking model and architecture of Wi-Fi
Standards are studied. Then the principle of physical layer and control
mechanism of media access control layer（MAC）of Wi-Fi Standards are
discussed in detail. To verify the theory and algorithm, simulation
platform is built using C++ in Linux system. The techniques of scrambling,
descrambling, convolutional coding, Viterbi decoding, interleaving,
deinterleaving，OFDM modulation, and demodulation are studied and
simulated. The curves of performance based on the simulation results are
then analyzed. Finally, based on the results of the physical layer, Beacon
transmission and reception are simulated under the distributed
coordination function in the independent basic service set to analyze the
performance of searching the neighboring stations.
Keywords Wi-Fi Standards OFDM physical layer Beacon C++
目 次
1 绪论 . 1
1.1 研究背景 . 1
1.2 现状和发展 .. 1
1.3 研究意义和目的 . 2
1.4 论文研究内容和章节安排 .. 2
2 IEEE802.11 标准 4
2.1 IEEE802.11 无线局域网参考模型 .. 4
2.2 IEEE802.11 网络体系结构 .. 5
3 OFDM物理层分析与仿真 7
3.1 OFDM的帧结构 8
3.2 PLCP前导码（Preamble） .. 8
3.3 信号（Signal）字段 9
3.4 数据（DATA）字段处理过程分析 . 10
3.5 OFDM物理层仿真与分析 14
3.6 本章小结 17
4 媒体接入控制MAC层分析与仿真 . 18