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Proposal of Frame Synchronization Method for Optical Turbo Coded System with Hybrid PPM-OOK Signaling

Turbo coding is used to improve the reliability of the optical wireless communication channel. There are on-off keying (OOK) and pulse position modulation (PPM) as methods used for the turbo code. The Hybrid PPM-OOK signaling (HPOS) which combines BPPM with OOK has been proposed. It is important to obtain frame synchronization in HPOS. In this paper, a frame synchronization method for HPOS using racing counters is proposed. The probability of detection and false alarm are derived and the relationship between the stage numbers of the counters and the synchronization performance are evaluated. As results, it is found that there is the trade-off between the probability of detection and the renewal rate.