【摘要】 研究了非协作通信系统中16QAM、32QAM、64QAM三种常用高阶QAM(正交幅度调制)的调制识别问题,提出了一种基于信号四次方谱和幅度特征的联合参数高阶QAM调制识别方法,并给出了详细理论分析及计算机仿真结果。该方法运算量低,易于工程实现,其正确识别率受载波及符号率估计性能影响较小。最后,基于FPGA通用硬件平台,测试结果验证了所提算法的有效性,达到了系统设计要求。在信噪比为14 dB时,正确识别率在90%以上。更多还原

【Abstract】 This paper studies classification of 16QAM,32QAM and 64QAM for non-cooperative communication systems.A practical M-QAM recognition method devised for 16QAM,32QAM and 64QAM is proposed and it is based on the characteristics of M-QAM in four times frequency domain and signal amplitude.The method features reduced numeration,convenient implementation and minimized influence by the performance of carrier estimation and symbol rate estimation.Finally,the method is implemented on FPGA platform and debugging results show that the correct recognition ratio is higher than 90% as long as SNR is higher than 14dB.更多还原