Impact of framed-DOOK optical wireless system using error correcting codes
Ran Sun, Hiromasa Habuchi, Yusuke Kozawa · 2017
For reducing the influence of background noise and inhibiting synchronization slip in optical wireless communication, framed-differential on-off keying (Framed-DOOK) modulation scheme has been proposed. In this paper, the Framed-DOOK is combined with error correcting codes. The bit error rates of Framed-DOOK system using both standard turbo code and regular low density parity check (LDPC) code are evaluated by computer simulation taking the background noise and scintillation into account. The simulation results are compared focusing on the effect of background noise reduction, for investigating which code is suitable for the Framed-DOOK modulation scheme. Likewise, the comparison of the bit error rate performances between the proposed Framed-DOOK system and the conventional on-off keying (OOK) system is presented. In conclusion, with -45.0 [dBm] background noise, the Framed-DOOK system using both standard turbo code and regular LDPC code is able to get a 4 [dB] enhancement than the conventional OOK system. Moreover, it is confirmed that at the effect of background noise reduction, the Framed-DOOK system using standard turbo code is better than the system using LDPC code, when transmitting a short block length (256[bits]) code.