基于FPGA的SOQPSK-MIL中频调制技术实现

Implementation of SOQPSK-MIL Intermediate Frequency Modulation Based on FPGA

中文关键词:  SOQPSK-MIL  恒定包络  功率谱密度  调制体制  FPGA

英文关键词:SOQPSK-MIL  constant envelope  power spectral density  modulation system  FPGA

中文摘要:

      首先介绍了SOQPSK调制体制的基本原理；然后根据SOQPSK调制实现过程对矩形成形波形下的SOQPSK信号进行仿真实验，得到其输出波形和功率谱密度，并同PCM/FM调制体制进行比较分析；最后在Matlab仿真的基础上，基于FPGA硬件平台实现了SOQPSK-MIL信号中频调制输出。仿真性能分析和硬件调制输出结果均表明，同PCM/FM调制体制相比SOQPSK调制体制具有更好的频带利用率，在未来的高码率遥测系统中具有较好的应用价值。

英文摘要:

      The basic principle of shaped-offset quadrature phase-shift keying (SOQPSK) modulation is introduced.Based on the modulation procedure，the SOQPSK-MIL is simulated,and the output waveform and power spectral density are compared with the PCM/FM modulation.The intermediate frequency (IF) modulation of SOQPSK signal is also achieved on FPGA development boards.The simulation and experimental results show that SOQPSK modulation obtains a better performance than PCM/FM modulation in terms of spectral efficiency.This significant feature makes it a better solution in high data rate telemetry systems in the future.