Abstract
We propose a 64-quadrature-amplitude-modulation (QAM) vector radio-frequency (RF) signal generation and detection via one intensity Mach–Zehnder modulator (MZM) by using optical carrier suppression modulation. In order to obtain an ordinary QAM modulated RF signal after the square-law detection of the photodiode, amplitude preequalization and phase precoding technique are employed. The 1Gbaud 64QAM vector signals performed on various RF carrier frequencies from 20 to 444 GHz are experimentally demonstrated. The bit-error-rate (BER) performance of unbalanced phase precoding adopting 64QAM modulation is investigated. The digital filter based on blind Decision-Directed Least-Mean-Squares (DD-LMS) algorithm is the key digital-signal-processing, which is used to improve system performance. This concept of the generation of 64QAM-modulated vector signal can be employed in the radio-over-fiber (ROF) system.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
