ieee802.11a物理層和mac子層協(xié)議算法研究

1、南京航空航天大學(xué)碩士學(xué)位論文IEEE802.11a物理層和MAC子層協(xié)議算法研究姓名：黃曉皓申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：朱鋼20080101I E E E 8 0 2 . 1 1 a 物理層和 M A C 子層協(xié)議算法研究 ii ABSTRACT In the past century, wireless communication has developed into a significant

2、 component in communication engineering, while mobile communication has experienced 1G , 2G and 3G's commercial availability on a wide scale. The research and application of 4G are also in a posit

3、ive process. As a technology of broadband wireless access, WLAN compensates the shortage of Ethernet and provides the customers information with large amounts of data. When the development of m

4、obile communication meets a cross- generation period, WLAN acts as a role of a service complement as well as an excellent application. This paper begins with the introduction of the broadband w

5、ireless access and then gives a general idea of the relevant mainstream technology. Afterwards, a detailed analysis on the IEEEE802.11 WLAN infrastructure was given. The paper introduces the impo

6、rtant modulation technology called OFDM, which is used in the physical layer of 802.11a.The detailed information of how to realize 802.11a's baseband is also presented. The research starts w

7、ith the simulation of system's transmitter, receiver and the channel it experienced. Several suggested synchronization algorithms are thoroughly researched and discussed. By analyzing on theory and si

8、mulation, the advantages and shortages are given.On that basic, some new algorithms, say, local short symbols cross correlation algorithm and changing- window correlation algorithm are realized and te

9、sted.Considering the complexity and performance, the new algorithms are feasible and easy to implement.As the frequency offsets estimation, a maximum likelihood estimation on timing and frequency offset

10、s is analyzed. The paper puts emphasis on the frequency synchronization on the time domain.The simulation gets the results expected.On the MAC layer, the basic mechanism and backoff algorithm ar

11、e researched and meanwhile some changes are made to the binary exponential backoff algorithm. Simulation results and analysis are presented. Key Words: Broadband Wireless Access , WLAN , OFDM ,