Optical intensity modulation direct detection versus heterodyne detection: A high-SNR capacity comparison

Anas Chaaban, Mohamed-Slim Alouini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

An optical wireless communications system which employs either intensity-modulation and direct-detection (IM-DD) or heterodyne detection (HD) is considered. IM-DD has lower complexity and cost than HD, but on the other hand, has lower capacity. It is therefore interesting to investigate the capacity gap between the two systems. The main focus of this paper is to investigate this gap at high SNR. Bounds on this gap are established for two cases: between IM-DD and HD, and between IM-DD and an HD-PAM which is an HD system employing pulse-amplitude modulation (PAM). While the gap between IM-DD and HD increases as the signal-to-noise ratio (SNR) increases, the gap between IM-DD and an HD-PAM is upper bounded by a constant at high SNR. © 2015 IEEE.
Original languageEnglish (US)
Title of host publication2015 5th International Conference on Communications and Networking (COMNET)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Print)9781509001965
DOIs
StatePublished - Sep 15 2016

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