摘要
针对QAM调制解调方案,探讨一种行而有效的载波恢复技术。扫频算法具有极大的频偏捕获能力,在扫频算法的基础上结合面向判决算法,实现了对载波大范围内频偏的捕捉和跟踪;改进了扫频门限的设定方法,使得在各种QAM制式下该算法都具有快速的频偏捕捉能力。Matlab仿真结果表明,该方法性能可靠,频偏捕捉范围可达5%符号率,适用于高速全数字QAM接收系统。
With the reference to the QAM, an effective carrier recovery method is integrated. Based on the great capability of sweeping algorithm to capture frequency offset, capturing and tracking of that in big range is accomplished associated with decision directed method. Also an improved design of sweeping threshold is used under all of the rank of QAM, making the algorithm have ability to capture frequency offset fast. The simulation results with Matlab shows that the method discussed is of reliability and reaches 5% symbolic rate capturing range, which applies to all digital transmission QAM receiving system.
出处
《电视技术》
北大核心
2011年第5期57-61,共5页
Video Engineering
基金
重庆市重大科技攻关项目(2009AA2027)
关键词
载波恢复
扫频
面向判决
QAM
carrier recovery
sweeping algorithm
decision directed method
QAM
