基于MCU实现的可编程OFDM信号发生器

Implementation of the Programmable OFDM Signal Generator Based on MCU

正交频分复用(OFDM)多载波调制(MCM)是第四代移动通信关键技术之一,在硬件实现OFDM信号方面一般是采用数字信号处理器(DSP)完成快速傅立叶反变换(IFFT)实现的。为了节省硬件资源,降低成本,以及便于实现OFDM信号的频率、幅度、相位等可调节,文中参考数字音频广播(DAB)模式3中的192路子载波数,先通过计算机编程产生作为测试标准的理想的OFDM信号波形,然后利用微控制器(MCU)以及查表方式,实现了一种可编程OFDM信号发生器硬件电路。测试结果表明,该信号发生器工作正常,并可实现频率、幅度、相位等的调节。

OFDM as the MCM is one of the key technologies for the 4G mobile communication. To implement the OFDM signal by hardware,we usually use the DSP device to finish IFFT process. In order to save hardware resource,reduce cost and be suitable to realize adjustment of the frequency,amplitude and phase for the OFDM signal,the paper refers to the 192 sub-carrier number in DAB mode 3,firstly produces the ideal OFDM signal wave as the test standard by computer program,then adopts MCU and look-up table approach to implement a programmable OFDM signal generator. The test result show that the generator works well and the frequency,amplitude and phase can be adjusted.