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》2007年第4期13-15,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。A full 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 employed. 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 be easily DSP-implemented. Simulation indicates 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：TN911.7[电子电信—通信与信息系统]