摘要
基于16进制的正交振幅调制(Quadrature amplitude modulation,QAM)通信系统,参照Gardener算法提出了一种改进的插值结构,减小了插值过程中由于频谱混叠造成的系统误差,提高了滤波器的输出精度.并对定时误差检测方法进行了修正,使其能够实现四电平调制信号符号误差的检测,且硬件实现复杂度低.仿真与实际测试均表明该算法在较低信噪比及大符号偏差下有较高的稳健性与有效性.
According to Gardener algorithm based on 16 quadrature am plitude modulation（16QAM） communication system, an improved interpolation structure is proposed . It reduces the systematic errors caused by spectrum aliasing and im-proves the accuracy of the output of the filter. Timing error detection method is modified to achieve four level modulation signal symbol error and hardware imple-mentation complexity is low. Simulation and practical test show that the algorithm has high robustness and effectiveness in low SNR and high symbol deviation.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第4期749-753,共5页
Chinese Journal of Radio Science
基金
国家重点实验室开放课题(CEME E2012K0106B)
国家科技重大专项课题(2010ZX03006-002)
