基于改进的瞬时信息量数字调制识别算法

摘要

针对瞬时信息量的调制识别算法抗噪性能差的问题，提出了一种基于改进的瞬时信息量的数字调制识别算法。通过提取5种新的瞬时信息特征参数，确定其判别次序和判决门限值，使得算法在低信噪比条件下依然能保持很高的识别性能。实验结果表明，算法在信噪比低至5 dB时，对不同的数字调制信号的识别率均达到90％以上，与同条件下的原有识别算法相比，识别正确率提升了15％。%In view of low anti⁃noise performance of modulation recognition algorithm for instantaneous information,a kind of digital modulation recognition algorithm based on improved instantaneous information is put forward. By extracting five new characteristic parameters of instantaneous information,this algorithm determines its decision order and decision threshold to keep higher recognition performance for digital modulation signal under the condition of low SNR.The simulation results show that this algorithm can realize the recognition rate of different digital modulation signal of above 90% in low SNR to 5 dB,which is 15% higher than recognition accuracy of existing original recognition algorithm under the same conditions.