节点文献

宽带无线数据传输的关键技术研究

【作者】 宋晓娟

【导师】 谢仁宏;

【作者基本信息】 南京理工大学 , 通信与信息系统, 2004, 硕士

【摘要】 宽带无线接入随着数据业务需求的不断增大,成为当今发展最为快速的一种接入技术。充分利用频率资源,使用高效调制方式,实现尽量高的接入速率,成为宽带无线技术的关键所在。 本文在研究了QAM在单载波和多载波中的基本实现原理的基础上,根据雷达系统对数据传输的技术要求,提出了用于收发分置雷达双向数据传输的宽带无线数据传输系统方案。在单载波传输中提出了以专用解调芯片STV0297为中频解调器、以单片机80552的I~2C总线控制、接入最大速率高达20Mbps的中频数字解调实现方案,根据QAM的特点,我们还在理论上研究了QAM单载波解调的关键技术,如符号同步、载波同步、数字解调等等,使得传输性能达到最优。而在多载波OFDM传输中,我们提出了实现框架,并对其一些关键技术进行了阐述,着重研究了载波恢复和符号同步技术,并进行了仿真验证,证明它的性能良好并实现容易。

【Abstract】 With the more and more demand for the data transmission ,wideband wireless access has been the access technique that is developing the most quickly now. Making full use of the frequency resource, choosing high-efficient modulation mode and transmitting data at higher rate, are all the key techniques .This paper investigates single-carrier and multi-carrier high-speed data transmission. A wireless data transmission scheme used in radar system is presented for data rate as high as 20 Mbps- In the single-carrier scheme, a wideband programmable QAM demodulator -STV0297 is used to support quadrature demodulation , and a SCM is utilized for control by I2C bus. On the basal theory of QAM communication ,the paper also researches some key technology of digital single-carrier QAM demodulation, such as symbol synchronization , frequency synchronization and timing etc, to make the system performance optimization. In the multi-carrier scheme, this paper discusses the realization frame of OFDM system and some key technology of OFDM. Frequency synchronization and symbol synchronization are the keystones.

  • 【分类号】TN925
  • 【下载频次】273
节点文献中: 

本文链接的文献网络图示:

本文的引文网络