CAJ | 학술논문

为解决非合作通信系统中OFDM（Orthogonal Frequency Division Multiplexing正交频分复用技术）信号的调制识别问题,提出一种基于四阶累积量的OFDM信号调制识别新方法。该方法利用OFDM信号时域包络具有渐近高斯性的特点,对已有基于累积量的识别方法进行改进,通过计算截获信号的复中频信号模值的四阶累积量,提取OFDM信号与单载波信号的分类特征量,对OFDM调制信号进行识别。该算法与已有的基于累积量的识别方法相比,计算量大大减小,且具有较好的识别效果。仿真实验表明SNR高于-2dB时,正确识别率大于99%,证明了该算法的有效性。
위해결비합작통신계통중OFDM（Orthogonal Frequency Division Multiplexing정교빈분복용기술）신호적조제식별문제,제출일충기우사계루적량적OFDM신호조제식별신방법。해방법이용OFDM신호시역포락구유점근고사성적특점,대이유기우루적량적식별방법진행개진,통과계산절획신호적복중빈신호모치적사계루적량,제취OFDM신호여단재파신호적분류특정량,대OFDM조제신호진행식별。해산법여이유적기우루적량적식별방법상비,계산량대대감소,차구유교호적식별효과。방진실험표명SNR고우-2dB시,정학식별솔대우99%,증명료해산법적유효성。
Due to its advantage of high spectrum utilization rate and low symbol interference, OFDM has a broad application in wireless communication systems. There is a wide demand for signal modulation identification and parameter estimation in electronic surveillance systems, military communication and interference identification. Thus the research of modulation identification of OFDM signal is the key point. Wtih the fact that the OFDM is asymptotical Gaussian, a detector based on high-order cummulants is proposed. Experiments show that this method has a good performance in the discrimination of OFDM from single cartier digital signals with less computation.