短波高速QAM信号解调算法的研究  

Research on Digital Signal Demodulation for HF QAM Signal

作　　者：赵艳[1] 段田东[1] 李昂[1] 

机构地区：[1]解放军信息工程大学,河南郑州450002

出　　处：《通信技术》2006年第S1期44-46,共3页Communications Technology

摘　　要：文中针对短波高速QAM信号,提出并实现了一种全数字的解调方案。采用了最大平均功率定时同步算法和最大似然载波相位估计算法。利用同步导频使信号的眼图张开,进而对数据段进行信道均衡与相位补偿。采用判决反馈模式的非线性均衡器,更好地补偿了信道畸变。这种前向式解调结构减小了算法的复杂性,易于DSP实现。Matlab仿真结果表明该方案有效可行。An all digital demodulation scheme is proposed for HF QAM signal.The maximum mean power estimation timing recovery algorithm and the maximum-likelihood carrier phase estimation algorithm are adopted.The synchronization preamble is used to open the signal eye pattern,and then adaptive equalization and phase compensation are carried out for data symbols.The non-linear decision feedback equalizer has well compensated channel distortion.This forward structure can reduce the complexity of the algorithm and beimplemented to DSP easily.Simulation shows the scheme is feasible and efficient.

关 键 词：符号定时 自适应均衡 载波相位恢复 

分 类 号：TN911.3[电子电信—通信与信息系统]