Journal
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
Volume 24, Issue 1, Pages 455-491Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/COMST.2021.3120087
Keywords
Gaussian channels; Tutorials; MIMO communication; Channel models; Channel capacity; Radio frequency; Optical receivers; Optical wireless; intensity modulation; channel models; Gaussian channel; input-independent; capacity; capacity bounds; multi-user channels
Funding
- National Science Foundation (CAREER) [2114779]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [2114779] Funding Source: National Science Foundation
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This tutorial provides an overview of the capacity results for intensity-modulation and direct-detection (IM/DD) channels used in optical wireless communication (OWC). It focuses on the capacity bounds for single-input single-output and multiple-input multiple-output systems.
Optical wireless communication (OWC) using intensity-modulation and direct-detection (IM/DD) has a channel model which possesses unique features, due to the constraints imposed on the channel input. The aim of this tutorial is to overview results on the capacity of IM/DD channels with input-independent Gaussian noise as a model of OWC channels. It provides the reader with an entry point to the topic, and highlights some major contributions in this area. It begins with a discussion on channel models and how this IM/DD Gaussian channel model comes about, in addition to an explanation of input constraints. Then, it discusses the capacity of the single-input single-output channel, its computation, and capacity bounds and asymptotic capacity results. Then, it extends the discussion to the multiple-input multiple-output setup, and reviews capacity bounds for this channel model. Finally, it discusses multi-user channels modelled as a broadcast channel (downlink) or a multiple-access channel (uplink), with their associated capacity bounds.
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