Optical intensity modulation direct detection versus heterodyne detection: A high-SNR capacity comparison
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AbstractAn 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.
CitationChaaban A, Alouini MS (2015) Optical intensity modulation direct detection versus heterodyne detection: A high-SNR capacity comparison. 2015 5th International Conference on Communications and Networking (COMNET). Available: http://dx.doi.org/10.1109/COMNET.2015.7566632.
SponsorsThis work is supported in part by King Abdulaziz City of Science and Technology (KACST) under grant AT-34-145
Conference/Event name5th International Conference on Communications and Networking, COMNET 2015