摘要
针对多音并行信号的调制识别问题,提出了一种基于四阶累积量的识别方法,用以识别特定通信协议下子载波调制样式为MPSK的多载波调制信号。该方法利用带通MPSK信号的累计量特征,在不考虑相位影响的情况下提出了该多音并行信号近似模型并通过理论计算和仿真验证此模型的正确性。然后利用此模型通过计算仿真找到子载波数与累计量参数的对应关系。根据这种对应关系提出识别算法并进行识别仿真,仿真结果表明在低信噪比(-5dB)下有很好的识别效果。
To identify modulation of multicarrier modulation(MCM) according to specifical communication protocols whose sub-carrier modualtion is MPSK,a method based on 4th-order cumulants is proposed.Without considering the influence of the phase,this method proposes a model of MCM using character of band-pass MPSK and proves its correctness through deduction and simulation.Then the relationship between number of subcarriers and cumulants is discovered through calculation and simulation.On the basis of the relationship,a recognition algorithm is proposed and simulated.The simulation results show high performance of identification when SNR(-5dB) is very low.
出处
《计算机仿真》
CSCD
2008年第9期308-311,共4页
Computer Simulation
关键词
多音并行调制
四阶累积量
子载波个数
识别
Multicarrier modulation
4th-order cumulants
Number of subcarrier
Identification
作者简介
谢奇(1982-),男(汉族),安徽巢湖人,合肥电子工程学院硕士生,研究方向为多载波调制信号识别;
崔琛(1962-),男(汉族),河北人,合肥电子工程学院教授,研究方向为通信系统仿真。