摘要
基于高阶累积量的数字调制信号识别算法在低信噪比环境下识别率较低。针对这一问题,提出了高阶累积量的改进算法,通过调整特征参数的判别顺序先识别出MASK信号的方式,取得了较好的效果。讨论了该算法的FPGA设计,并利用Virtex-4开发板对该设计进行硬件协同仿真测试。测试结果表明,该算法在低信噪比环境下对2ASK,4ASK,4PSK,16QAM信号的识别率有显著提高。在信噪比为4 dB时,对2ASK,4ASK信号的识别率分别为93.4%,100%。在信噪比为2 dB时,对4PSK,16QAM信号的识别率最高,达到了99.7%。
The digital modulation recognition algorithm based on higher-order cumulant has a low recognition rate in low SNR environment.An improved higher-order cumulant algorithm is introduced to solve the problem.It achieved better effect by adjusting the decision order of characteristic parameters,and identifying MASK signal firstly.It implemented the FPGA design of the algorithm,and the hardware co-simulation test with the help of Virtex-4 development board.The test results show that the algorithm has significantly improved the recognition rate of 2ASK,4ASK,4PSK and 16QAM signal in low SNR environment.The recognition rates of 2ASK,4ASK signal are 93.4%and 100% when SNR is 4dB.When SNR is 2dB,the recognition rates of 4PSK and 16QAM signal are the highest,reaching 99.7%.
出处
《现代电子技术》
2010年第21期1-4,共4页
Modern Electronics Technique
基金
国家自然科学基金资助项目(60772031)
