On the Capacity of Intensity-Modulation Direct-Detection Gaussian Optical Wireless Communication Channels: A Tutorial

Chaaban, Anas; Rezki, Zouheir; Alouini, Mohamed‐Slim

doi:10.1109/comst.2021.3120087

Cited by 40 publications

(29 citation statements)

References 223 publications

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“…In IM, information is retrieved at the receiver side by detecting the intensity of received light, which is modulated as an information-carrying signal. Opposite to RF conventional communication that may include complex types of data, intensity-modulated signals are rather positive and real-valued [23]. Besides bypassing the OOK disadvantages, its simplicity and low-cost installation are other advantages of the IM technique.…”

Section: Methodsmentioning

confidence: 99%

Low Power FPGA Implementation of a Smart Building Free Space Optical Communication System

Ali

Eassa²,

Aly³

et al. 2022

Photonics

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Free Space Optical (FSO) communication systems have extensively invaded the speed of smart city evolution due to the current surge in demand for wireless communication spots that can match recent challenges due to high technical leaps in smart city evolution. As the number of users is vastly increasing throughout all networks in the form of machines, devices, and variously distinct objects, FSO is a hugely recommended robust communication system that mitigates a lot of RF disadvantages on the field with no need for licensing, fast rollout time, and low cost. This paper shows an exploit of a Low Power Field Programmable Gate Array (FPGA) based FSO communication system designed for Line of Sight (LOS) Building to Building Communication over a distance of 12 m using a 650 nm Visible Light (VL) red laser source via On-Off Keying (OOK) and higher-level Intensity Modulation (IM)/Pulse Width Modulation (PWM) schemes. The implemented system reached a doubled data rate than OOK of 230 kbps using the IM technique. Traffic monitoring and building security status can be frequently updated between adherent buildings, each scanning its zone real-time conditions and sharing them with the neighboring links.

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Section: Methodsmentioning

confidence: 99%

Low Power FPGA Implementation of a Smart Building Free Space Optical Communication System

Ali

Eassa²,

Aly³

et al. 2022

Photonics

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“…where (31b) and (31c) follow because XACO → X ACO → X and R ACO → {Y 1 , Y 2 } are one-to-one mappings, and (31d) follows from (20). Combining (31e) with (28) we obtain (29). The proof is completed by noting that, to maximize the information rate, we should let σ x = √ 2πE (i.e., let E[S] achieve its upper limit E, see (22)).…”

Section: Information Rate With Improved Receiversmentioning

confidence: 97%

“…), and {W i } are IID N (0, σ 2 ) noise samples. For a detailed discussion of the model (2), see [4], [29].…”

Section: A Channel Modelmentioning

confidence: 99%

Improved Receivers for Optical Wireless OFDM: An Information Theoretic Perspective

Liu¹,

Zhou²,

Huang³

et al. 2022

Preprint

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We consider performance enhancement of asymmetrically-clipped optical orthogonal frequency division multiplexing (ACO-OFDM) and related optical OFDM schemes, which are variations of OFDM in intensity-modulated optical wireless communications. Unlike most existing studies on specific designs of improved receivers, this paper investigates information theoretic limits of all possible receivers. For independent and identically distributed complex Gaussian inputs, we obtain an exact characterization of information rate of ACO-OFDM with improved receivers for all SNRs. It is proved that the high-SNR gain of improved receivers asymptotically achieve 1/4 bits per channel use, which is equivalent to 3 dB in electrical SNR or 1.5 dB in optical SNR; as the SNR decreases, the maximum achievable SNR gain of improved receivers decreases monotonically to a non-zero low-SNR limit, corresponding to an information rate gain of 36.3%. For practically used constellations, we derive an upper bound on the gain of improved receivers. Numerical results demonstrate that the upper bound can be approached to within 1 dB in optical SNR by combining existing improved receivers and coded modulation. We also show that our information theoretic analyses can be extended to Flip-OFDM and PAM-DMT. Our results imply that, for the considered schemes, improved receivers may reduce the gap to channel capacity significantly at low-to-moderate SNR.

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“…Unlike wireless communications, we can only derive capacity bounds in VLC based on information theory to analyze IM/DD Gaussian channel. It can be found that the channel capacity bounds are asymptotically tight given the condition of high signal-to-noise ratio (SNR) or low SNR, and both of them are suitable for engineering practice [4][5][6][7]. To enhance the capacity, traditional methods are adopted to update technology of coding and decoding in transmitter and receiver, respectively.…”

Section: Introductionmentioning

confidence: 99%

Capacity Maximization for Reconfigurable Intelligent Surface-Aided MISO Visible Light Communications

Zhang

Guo

2022

Photonics

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This paper investigates the employment of reconfigurable intelligent surfaces (RISs) to improve the asymptotic capacity of the multiple-input single-output (MISO) visible light communication (VLC) system in the case of high signal-to-noise (SNR). For the RIS-aided MISO-VLC system based on mirror array, we regard the high-SNR asymptotic capacity with the input subject to peak-intensity constraints as a goal and formulate an asymptotic capacity maximization problem to find the optimal orientations of mirrors. As for the non-convex optimization problem, we convert it into a quadratic programming (QP) problem with hemispherical constraints and prove that it can be solved by computing the maximum eigenvalue of an equivalent matrix. Simulation results indicate that the asymptotic capacity is able to be improved significantly by adopting RIS in MISO-VLC systems. Meanwhile, we observe that the proper deployment scheme of RIS is able to enhance the degree of improvement through several simulations.

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On the Capacity of Intensity-Modulation Direct-Detection Gaussian Optical Wireless Communication Channels: A Tutorial

Cited by 40 publications

References 223 publications

Low Power FPGA Implementation of a Smart Building Free Space Optical Communication System

Low Power FPGA Implementation of a Smart Building Free Space Optical Communication System

Improved Receivers for Optical Wireless OFDM: An Information Theoretic Perspective

Capacity Maximization for Reconfigurable Intelligent Surface-Aided MISO Visible Light Communications

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