Iterative Nonlinearity Mitigation and Decoding for LED Communications

• Published in: IEEE photonics technology letters Vol. 30; no. 19; pp. 1731 - 1734
• Main Authors: Zhao, Weikang, Guo, Qinghua, Yu, Yanguang, Xi, Jiangtao, Tong, Jun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-10-2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Communication systems; Communications systems; Decoding; Distortion; Interference; Iterative decoding; iterative receiver; LED communications; Light emitting diodes; Nonlinear distortion; Nonlinearity; nonlinearity mitigation; Performance degradation; post-distortion; Receivers
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2018.2867848

The light-emitting diode (LED) is the major source of nonlinearity in LED communication systems, which needs to be carefully handled to avoid significant performance degradation. Post-distortion is an effective and convenient way to compensate the nonlinear distortion at the receiver side. In this letter, we propose a soft-in-soft-out (SISO) post distorter, which works with an SISO decoder iteratively by exchanging log-likelihood ratios of the coded bits at the receiver. It is demonstrated that the proposed iterative technique can achieve a remarkable performance gain compared to the conventional post-distortion technique in the literature.