一种通用的OFDM发射机设计

A Universal Design of OFDM Transmitters

正交频分复用(OFDM)系统参数众多,设计灵活,可以根据不同用途、信道环境以及接收机的性能等,设计出很多不同的OFDM系统。针对此问题,提出了一种通用的基于训练序列的OFDM发射机设计方案。从性能的角度出发,设计了OFDM符号结构和传输帧结构,并重点分析了OFDM数字基带调制模块的组成,最终在Xilinx开发板上实现了该方案,并获得了OFDM各模块的仿真时序图、OFDM射频信号频谱和误比特率图。研究结果表明,该方案频谱利用率高,复杂度低,通用性好。

The Orthogonal Frequency Division Multiplexing(OFDM)system can be designed flexibly because of its variety of parameters.According to different applications,environment of channels and the performance of receivers,it can be designed differently.To deal with this problem,a universal design of OFDM transmitter based on training sequence is proposed.The structure of OFDM symbols and transmission frames are designed from the view of performance.The composition of OFDM digital baseband modulator is emphasized.Finally,the scheme is realized by Xilinx development board.And the sequence diagram of each module,the signal spectrum and the bit error rate(BER)are obtained.Research shows that this scheme has the advantage of high spectral efficiency,low complexity and good versatility.