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Achievable Information Rates of Nonbinary Codes for Optical Fiber Transmission

Liga, G; Alvarado, A; Bayvel, P; Agrell, E; (2017) Achievable Information Rates of Nonbinary Codes for Optical Fiber Transmission. In: (Proceedings) 29th IEEE Photonics Conference (IPC). (pp. pp. 309-310). IEEE Green open access

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Abstract

Introduction Next generation spectrally-efficient optical fiber systems will require the combination of forward error correction (FEC) and high-order modulation formats. The joint design of the FEC encoder and the bit-to-symbol mapper is known as coded modulation (CM) [1]. Achievable information rates (AIRs) of CM schemes have been recently studied in the context of optical fiber communication in [2]–[3][4][5][6][7]. In these works, following the “mismatched decoder” principle [8], different variants of the mutual information (MI) [9], [10] were used. Since most of the complexity of the system lies in the CM decoder structure, it is particularly important to quantify the impact of the CM decoder implementation on the AIRs. In [2], AIRs for hard-decision (HD) and soft-decision (SD) decoders were compared for modulation formats such as PM-16QAM and PM-64QAM and a fixed transmission distance. In [6], the bit-wise MI was used to calculate AIRs for SD binary decoders. Recently, in [5], the conventional symbol-wise (SW) MI was used to estimate AIRs for SD nonbinary FEC schemes. HD decoders represent a low complexity alternative to SD decoders. However, AIRs for HD nonbinary codes have not been explored yet in the context of optical fiber communications. In this paper, we calculate AIRs for HD nonbinary decoders in optical fiber systems. We compare these AIRs with the ones of SD decoders over different transmission distances and for two QAM modulation formats with high spectral efficiency (SE): PM-64QAM and PM-256QAM.

Type: Proceedings paper
Title: Achievable Information Rates of Nonbinary Codes for Optical Fiber Transmission
Event: 29th IEEE Photonics Conference (IPC)
Location: Waikoloa, HI
Dates: 02 October 2016 - 06 October 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IPCon.2016.7831111
Publisher version: https://doi.org/10.1109/IPCon.2016.7831111
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Physical Sciences, Engineering, Electrical & Electronic, Optics, Engineering, COMMUNICATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10061684
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