Advanced Turbo Code System with HPOS for FSO Strong Turbulence Channel

Abstract

In this paper, the turbo code system with hybrid PPM-OOK signaling (HPOS) has been advanced by adding a new signal converter to improve the performance in the free space optical (FSO) strong turbulence channel. The proposed system is extended from the standard turbo code to the punctured turbo code. The bit error rate (BER) performance characteristics of the proposed system in the strong turbulence channel are evaluated by computer simulation. It was found that the proposed system with the new signal converter outperforms the conventional HPOS system. The BER performance of the proposed HPOS system is almost the same as that of the binary pulse position modulation (BPPM) punctured turbo code system, but its transmission efficiency of the proposed HPOS system is about 1.3 times higher.