基于FFT-IFFT的高速卫星成形滤波器设计及其FPGA实现

The Design of Shaping Filter Based on FFT-IFFT in the Satellite High-speed Transmission and FPGA Implementation

根据高速卫星TCM 8PSK调制解调的要求,针对数字化基带成形滤波的信号处理特点和FPGA内部结构,本文提出一种基于FFT-IFFT的高速卫星成形滤波器设计方法及FPGA算法。FPGA中有FFT的ipcore资源,直接引用FPGA中的ipcore资源能简化编程,易于快速实现。在X IL INX公司100万门的芯片V IRTEX 2-1000上实现此方案,MODELSIM的时序仿真结果表明可支持高达400M b it/s的输入数据,满足卫星通信高速成形的要求。本文结尾针对未来更高速率的成形滤波器给出了一种通用硬件实现方法。

Aimed at the signal processing characteristics of digitally-implemented base-band shaping, this paper put forward a design method of high speed satellite shaping filter based on FFT-IFFT according to the demand for high speed 8PSK modulator and the FPGA implementation scheme. It was easy to realize the FPGA implementation scheme because there was the ipcore of FFT in the FPGA. The project was implemented in the VIRTEX2-- 1000 of XILINX corporation and proved correct through MODELSIM timing simulation. This paper presents a general hardware implementation way of the future high speed shaping filter in the end.