Frame Synchronization Performance of Optical-Wireless Hybrid BPPM-OOK System

Turbo code can be closed to the Shanon limit and is expected to be used for reliable applications. The optical-wireless turbo coded system with a hybrid BPPM-OOK is superior to those using other pulse modulation schemes in bit error rate performance. To realize the optical-wireless turbo coded system with hybrid BPPM-OOK demands the implementation of frame synchronization schemes. The frame synchronization scheme for the turbo coded system with hybrid BPPM-OOK are proposed. The scheme is focused on the frame structure which consists of two slots for BPPM and two slots for OOK. The detection probability of frame timing signal and the average false alarm probability are evaluated. However, it is difficult to optimize the number of stages on the racing counters. In this paper, the retention time and the recovery time are evaluated to derive the optimization of the stages of racing counters in the frame synchronization system. As a result, it is found that the optimum number of stages on racing counters varies according to required recovery time.

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