一种超宽带可变符号率FQPSK调制方法

An Ultra-Wideband Variable Symbol Rate FQPSK Modulation Method

针对传统费赫尔正交移相键控(Feher’s Quadrature Phase Shift Keying,FQPSK)调制算法在硬件实现时,符号速率受系统时钟频率限制,难以实现大容量传输的问题,借鉴直接数字合成(Direct Digital Synthesis,DDS)原理,提出了一种超宽带可变符号率FQPSK调制方法,通过并行查找表实现超宽带FQPSK波形映射,通过频率控制字,实现可变符号率调制,突破了系统时钟频率对符号率的限制。在Vivado环境中的Verilog HDL程序仿真,验证了所提方法的有效性。

When the conventional FQPSK(Feher’s Quadrature Phase Shift Keying)modulation algorithm is implemented in hardware,the symbol rate is limited by the system clock frequency and it is difficult to achieve large-capacity transmission.To address these problems,an ultra-wideband variable symbol rate FQPSK modulation method is proposed with reference to the DDS(Direct Digital Synthesis)principle.This method implements ultra-wideband FQPSK waveform mapping through parallel lookup tables,and achieves variable symbol rate modulation by frequency-controlled words,which breaks through the limitation of system clock frequency on symbol rate.Verilog HDL program simulation in Vivado environment verifies the effectiveness of the proposed method.