摘要
为了增大对16-APSK信号的鉴相范围,提高环路捕获带宽,提出了在环路捕获阶段使用精简星座鉴相、在捕获完成后使用混合NDA/DD鉴相的载波同步结构。这种结构在实现了环路捕获带宽增加的同时,仍然保持了混合NDA/DD法实现简单、与符号判决单元无耦合、运算速度快的优点。仿真结果验证了使用精简星座鉴相后环路捕获带宽的增加。
In order to enlarge the phase detection range and frequency offset acquisition range, a novel carrier recovery loop is proposed, which is based on the idea of combining reduced-constellation and hybrid NDA/DD phase detectors. This loop structure enlarges the acquisition range of 16-APSK carrier loop by almost three times. At the same time, the advantages of hybrid NDA/ DD method, such as simple implementation, decoupling for symbol detection unit, fast operation, etc., are still remained. Simulation results verifies the performance of the proposed structure.
出处
《电子技术应用》
北大核心
2012年第12期87-89,93,共4页
Application of Electronic Technique
关键词
16-APSK
载波同步
精简星座
鉴相
捕获
16-APSK
carrier synchronization
reduced constellation
phase detection
acquisition
