IEEE802.11g协议分析及其射频电路研究

【作者】 张勇；

【导师】 丁君；

【作者基本信息】 西北工业大学 ， 电磁场与微波技术， 2005， 硕士

【摘要】 随着无线数据通信技术的发展,各种标准随即制定并逐步推出其产品,各类调制技术和射频电路的设计也逐渐成为产品设计的重点和难点。基于此,本论文以IEEE802. 11g无线局域网系统为导向,系统的介绍了性能优良的正交频分复用(OFDM)调制技术及其在无线局域网系统中的应用,并主要讨论了基于该调制技术的无线局域网射频前端电路结构和链路分析,同时对其各模块的功能和实现进行了详细分析。全文主要有以下三个部分:第一部分介绍了IEEE802. 11无线局域网系统的拓扑结构及其媒体访问控制层和物理层的工作特点,进而讨论了正交频分复用(OFDM)调制技术及其在IEEE802. 11g无线局域网中的应用。第二部分主要分析了无线局域网射频电路总体结构及其设计与规划流程,详细讨论了射频前端各影响因素及其对电路整体性能的影响;同时在说明了链路预算方法的基础上,预估了无线局域网射频前端的操作性能。第三部分则主要对射频前端电路各模块进行详细分析,在讨论了各模块的工作原理及外部无源器件的功能基础上,给出了各模块的规格参考参数;同时着重对布局于PCMCIA卡上并工作于ISM频段的天线进行了分析和设计。更多还原

【Abstract】 With the development of wireless data communication, many different communication criterions are constituted and the products based it also gradually are push out. Different kinds of modulation technique and RF circuit design become the stress and difficulty. In this thesis, we introduce systematically the Orthogonal Frequency Division Multiplexing (OFDM) modulation technique and it’s application in IEEE802.11g Wireless Local Area Network (WLAN). Then our main discussion is WLAN RF front-end architecture and link budget analysis flow based on the OFDM modulation technique.This thesis consisted of three parts:Part 1 introduced the topology structure, Medium Access Control layer (MAC) and Physical layer (PHY) of IEEE802.11 WLAN. While the OFDM modulation technique and it’s application in IEEE802.11g WLAN were mainly discussed.Part 2 analyzed the collectivity architecture of WLAN RF circuit and it’s layout and flow. The influence factors to RF font-end were also discussed. On the base of illuminating the link budget principle, the performance of RF front-end was estimated.Part 3 mainly analyze the modules of WLAN RF circuit. Their specifications were trimmed after discussing their principle and the function of exterior passive elements. In the end, an ISM frequency’s antenna on the PCMCIA board was designed and analyzed.更多还原