Error Correction Coding for Performance Enhancement of ADO-OFDM System in the Presence of Weak Atmospheric Turbulence | ||||
| Menoufia Journal of Electronic Engineering Research | ||||
| Article 16, Volume 27, Issue 1, January 2018, Page 317-336 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjeer.2018.64676 | ||||
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| Authors | ||||
| Hend Ibrahim1; Naglaa Fathi1; Mahmoud Ibrahim1; Fathi El-Sayed2 | ||||
| 1Dept. of Electronics and Communications, Faculty of Engineering, Zagazig University | ||||
| 2Dept. of Electronics and Communications, Faculty of Electronic Engineering, Minufiya University. | ||||
| Abstract | ||||
| In Free Space Optics (FSO) systems, atmospheric turbulence is considered as the main problem. The overall performance of FSO system may be degraded in the presence of weak atmospheric turbulence. This paper offers an approach for performance improvement of FSO systems by using Asymmetrically Clipped DC-biased Orthogonal Frequency Division Multiplexing (ADO-OFDM) with error correction coding, especially in the presence of weak atmospheric turbulence. Generally, most studies about ADO-OFDM do not consider the turbulence effect. In this paper, we take this effect into consideration and try to reduce its drawbacks using error correction coding. ADO-OFDM is a form of Intensity Modulation/Direct Detection (IM/DD) Optical Orthogonal Frequency Division Multiplexing (O-OFDM) system that merges aspects of Asymmetrically Clipped Optical OFDM (ACO-OFDM) and DC-biased Optical OFDM (DCO-OFDM). The log-normal distribution model is used to express the weak atmospheric turbulence effect. This paper proposes an approach to mitigate the effect of weak atmospheric turbulence using error correction coding. A comparative study between Hamming and LDPC coding is presented in this paper for performance enhancement. From the obtained results, it is observed that Hamming code gives a performance enhancement by approximately 5.5 dB at BER =10-3 and fading strength . LDPC code gives a performance enhancement by approximately 1.5 dB at BER= 10-1 and fading strength. At EbNo= 1 dB , it is seen that BER=0.112 in case of using Hamming code, this value decrease to become 0.06327 in case of using LDPC code. | ||||
| References | ||||
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