CAJ | 학술논문

针对数字卫星常用的7种通信信号调制方式(QPSK、8PSK、16QAM、32QAM、64QAM、16APSK、32APSK)，对零中心归一化瞬时幅度谱密度最大值、四次方谱、幅度、高阶累积量四种特征参数进行了分析，提出了一种联合特征参数的信号调制识别方法。该方法能有效地抑制高斯白噪声的影响，较好地解决了MAPSK信号低信噪比条件下调制识别率低的问题。仿真结果表明，与其他方法相比，本文方法无需先验知识，具有较高识别率。
침대수자위성상용적7충통신신호조제방식(QPSK、8PSK、16QAM、32QAM、64QAM、16APSK、32APSK)，대령중심귀일화순시폭도보밀도최대치、사차방보、폭도、고계루적량사충특정삼수진행료분석，제출료일충연합특정삼수적신호조제식별방법。해방법능유효지억제고사백조성적영향，교호지해결료MAPSK신호저신조비조건하조제식별솔저적문제。방진결과표명，여기타방법상비，본문방법무수선험지식，구유교고식별솔。
For the seven types of modulation modes commonly used in the digital satellite communication singles, including QPSK, 8PSK, 16QAM, 32QAM, 64QAM, 16APSK, 32APSK, this paper analyzes their four characteristic parameters including the maximum of instantaneous amplitude spectrum density normalized at the zero center, quartic power spectrum, amplitude, high-order cumulants, and proposes a method of signal modulation recognition with joint characteristic parameters. This proposed method could suppress effectively the Gaussian white noise and get over the low modulation recognition rate of MAPSK under the condition of lower SNR. Simulation results indicate that this method needs no priori knowledge and has a higher recognition rate, compared with other ones.