高阶正交调幅载波恢复算法的研究  

Study on High Order QAM Carrier Recovery Algorithm

作　　者：王玲[1] 王茜[1] 阎啸[1] 

机构地区：[1]电子科技大学航空航天学院,四川成都611731

出　　处：《广东电力》2013年第1期29-32,共4页Guangdong Electric Power

基　　金：国家863项目资助(2011AA***4018)

摘　　要：设计了一种适合于高阶正交调幅(quadrature amplitude modulation,QAM)信号的载波恢复环路结构。此结构从减小相位抖动和增加频率捕获范围的角度出发,采用双模载波同步,且环路带宽可控制的载波恢复环路。在鉴相阶段引入带加权的判决导向(decision director,DD)算法,从而获得快速的载波恢复性能。仿真结果验证了该算法的可行性和有效性,可以在较大频率偏移条件下快速实现高阶QAM载波相位精确跟踪,频率偏移估计范围可达0.3符号率,同时证明该算法也同样适用于十字型QAM信号。This paper designs a carrier recovery loop structure which is suitable for high order quadrature amplitude modula- tion. Based on reducing phase shaking and increasing frequency capture range, this structure adopts double die carrier syn- chronization and carrier recovery loop which is controlled by loop bandwidth. By introducing weighted decision director al- gorithm during the stage of phase detection, it attains rapid carrier recovery performance. The simulation result shows feasi- bility and effectiveness of this algorithm which may quickly realize precise track for high order QAM carrier phase under more frequency offset of approximately 30% symbol rate. And meanwhile, this algorithm is applied for cross QAM signals.

关 键 词：高阶正交调幅 载波恢复 带加权的判决导向算法 数字锁相环 

分 类 号：TN919[电子电信—通信与信息系统]