【作者】 黄伟；

【导师】 陶成；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 正交频分复用（OFDM，Orthogonal Frequency Division Multiplexing）技术作为一种可以有效对抗信号波形间干扰的高速传输技术，引起了广泛关注。它利用许多并行的、传输低速率数据的子载波来实现高速率的通信。它的特点是各子载波相互正交，所以扩频调制后的频谱可以相互重叠，不但减小了子载波间的相互干扰，还大大提高了频谱利用率。由于OFDM的高频谱利用率、易于硬件实现、对抗频率选择性衰落和窄带干扰的能力突出等优点，它成为第四代移动通信的首选技术，是当前移动通信技术研究的热点问题。本文概括的介绍了OFDM系统的基本概念、基本工作原理和关键技术，重点讨论了如何在FPGA上实现OFDM低中频收发信机。基于这些理论知识，确定了OFDM低中频收发信机系统实现方案，并选择ALTERA公司的Cyclone^TMⅡDE2教学评估板和DK-DAP-2C70N开发套件作为FPGA硬件平台，通过使用Verilog语言对FPGA芯片硬件编程，完成具体的硬件实现。最后，针对系统的特点，制定出具体的测试方案，对所设计的系统进行了调试和性能测试。更多还原

【Abstract】 OFDM （Orthogonal Frequency Division Multiplexing） is a high-speed Transaction technology which can defeat ICI （Inter-Channel Interference） and ISI （Inter-symbol Interference）, so it makes OFDM more and more popular. OFDM transmits high-speed data through many sub-carriers which are parallel and have lower transmission frequency. All the sub-carriers are orthogonal, so their frequency spectrum can be lapped from each other. That can not only decreases ISI, but also increases frequency spectrum utilization. Because all of above, OFDM has been the first choice in 4G mobile communication technology.In this paper, we introduce the basic theory, fundamental operating principles and key technology. Most importantly, we discuss how to implement the OFDM low-IF transmitter and receiver Base on FPGA. Base on these theories, we get the whole structure about the OFDM low-IF transmitter and receiver, and use Cyclone^? H DE2 Development & Education Board and DK-DAP-2C70N Development Board as hardware platforms. After programming the FPGA chips using the Verilog HDL language, the whole design is presented.At last, we set down detailed test plan and make the test. After the test, some useful conclusions are drawn and some guides about the continuous work are given.更多还原