Digital Carrier Recovery Algorithm Simulation of 60 GHz RoF system

Inhalt:
In this paper, a digital carrier recovery for a 60 GHz Radio-over-Fiber (RoF) system was researched. The system consists of three stages: optical 60 GHz carrier generation and mPSK data modulation with data rates up to 10 Gbit/s, simplex optical receiver (optical band pass filter and photo diode), and 60 GHz electrical coherent IQ down conversion. After the down conversion, the signal is digitized and the carrier recovery is performed to compensate for the electrical LO frequency offsets and phase drifts. The capability of using the well-established Viterbi & Viterbi algorithm as a carrier recovery solution for a 60 GHz RoF system was investigated. The proposed system was simulated by VPItransmissionMaker. The resulting data from the scenario has been processed by a MATLAB implementation of the V&V algorithm. The eye diagrams, constellation plots, phase plots, and cross correlation plots all verified the capability of the algorithm to compensate the phase shift as well as frequency shifts up to 5 MHz in our implementation, and emphasized the power of the algorithm in synchronization for RoF systems.