Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Abstract

In this paper, turbo-coded on-off keying (OOK) with differential detection is proposed. The proposed system constitutes the standard turbo code with OOK modulation, differential encoding and a delay detection technique. The purpose of using the differential encoding system is to suppress the influence of background noise in an optical wireless channel (OWC). OOK systems use the threshold detection method to determine the data. In optical intensity modulation/direct detection (IM/DD) systems, disturbances in the channel such as background noise and scintillation make it more difficult to decide the threshold value. Hence, in order to deal with the degradation in the quality of communication due to background noise, a turbo-coded OOK system with differential encoding and delay detection is proposed. The bit error rate (BER) performance of the proposed system is analyzed through computer simulation of an OWC in the presence of background noise, scintillation and avalanche photodiode (APD) noise. In terms of the BER performance, the results of this study show that the proposed system outperforms the conventional turbo-coded OOK system by 2.0 [dBm] at BER=10 −5 .

Differential-OOK System for Underwater Visible-Light Communications

“…We also consider a differential on-off keying (DOOK) system in our simulation model. This DOOK system was proposed to reduce the effect of background noise in free-space optical communications [9]. To verify the practical effectiveness of the DOOK system for underwater communication, we analyze and evaluate the BER performance of the DOOK system taking into account the spectral attenuation of water and the background noise obtained from our underwater daylight noise model.…”

“…To verify the practical effectiveness of the DOOK system for underwater communication, we analyze and evaluate the BER performance of the DOOK system taking into account the spectral attenuation of water and the background noise obtained from our underwater daylight noise model. Figure 1 shows the system model of the DOOK system [9] and Fig. 2 shows the transmitter and receiver positions as below.…”

Robust Turbo-Coded OOK System for Background Noise Alleviation and Frame Synchronization in Optical Wireless Channel

“…The framed-DOOK system can reduce the effect of background noise by using differential coding and suppress the occurrence of synchronization slip by frame-bit stuffing. In addition, in order to improve the BER performance of the framed-DOOK system, we proposed the standard turbo-coded DOOK system [10]. The turbo-coded system, which employs an error-correcting code, can improve the BER performance of the OOK system in an optical wireless channel [11], [12].…”

“…The turbo-coded system, which employs an error-correcting code, can improve the BER performance of the OOK system in an optical wireless channel [11], [12]. In [10], we reported that the standard turbo-coded DOOK system can improve the BER performance of the conventional turbo-coded OOK system in the presence of background noise and scintillation. However, we did not investigate the effect of the punctured turbo-coded system, which has a higher coding rate than the standard turbo-coded system.…”