FPGA软件无线电平台实现OFDM关键问题的研究

Research on Key Issues of OFDM Transceiver Based on FPGA

在软件无线电平台上快速实现原型样机,已成为评价通信新技术的重要方法.本文以基于FPGA的软件无线电平台实现OFDM收发信机为例,分析了浮点数与定点数仿真的基本方法及原型样机的设计流程,针对802.11a突发分组OFDM收发信机中的帧同步、符号定时和信道估计等在FP-GA中的实现问题,提出了适合于硬件实现的优化算法,节省了硬件资源.最后,在验证平台上实现了全数字OFDM收发信机.测试结果表明,新方法设计合理,收发信机在中频能稳定的无误帧传输.

Fast verification of the prototype design upon software radio platform has become one of the most important contents in communication assessment. This paper introduces the fundamental method of float-point and fixed-point simulation and rapid prototype design flow. Then some key issues such as OFDM frame synchronization, symbol timing, channel estimation, and so on are optimized, which significantly reduced the usage of hardware resources. The validness is illustrated here with experimental results from the implementation of OFDM burst frame transceiver.