首页>
外国专利>
Blind carrier frequency offset detection for coherent receivers using quadrature amplitude modulation formats
Blind carrier frequency offset detection for coherent receivers using quadrature amplitude modulation formats
展开▼
机译:使用正交幅度调制格式的相干接收机的盲载波频率偏移检测
展开▼
页面导航
摘要
著录项
相似文献
摘要
Exemplary embodiments are directed to a blind carrier recovery system for blind detection and/or correction of carrier frequency offset between the signal laser source and local oscillator (i.e., carrier frequency recovery) for optical systems employing quadrature amplitude modulation (QAM). Exemplary embodiments can be implemented using an improved fast Fourier transform (FFT)-based approach. Some embodiments can include a frequency sign detection technique that uses parallel, concurrently implemented FFTs having a modified FFT architecture. Some embodiments can include a frequency sign detection technique that uses time-domain slope detection based on constellation classification.
展开▼