OFDM基带处理系统的设计与实现

The Design and Operation of OFDM Baseband Processing System

通过分析OFDM基本原理及系统的基本结构,对早期模型进行改进,根据自顶向下的设计概念,从系统级上完成了各个功能子模块的划分,给出了系统方案以及关键技术的实现方法。在设计中同步采用基于循环前缀的联合同步算法,峰均功率比抑制采用加扰方法,信道估计采用基于导频的方法。使用Verilog HDL硬件描述语言编写底层代码,在Quartus II9.0开发平台上进行仿真和时序分析,完成OFDM基带处理系统的设计。从设计中可以看出,使用FPGA实现OFDM算法切实可行。

Through the analysis of basic principle of OFDM and basic structure of the sys- tem, to improve on early models, according to the top-down design concepts, from the sys- tem-level, the division of each functional sub-module is completed on, and the system scheme and implementation methods of the critical technology are given. The joint synchro- nization algorithm based on cyclic prefix is adopted for synchronization, the scrambling method is used for peak to average power ratio（PAPR） reduction, and channel estimation is based on pilot method. Verilog HDL hardware description language is used to write the un- denying code. The Simulation and timing analysis are implemented on the Quartus II9.0 de- velopment platform. The design algorithm for OFDM using FPGA is fully viable.