Journal ArticleDOI
Polar-based OFDM and SC-FDE links toward energy-efficient Gbps transmission under IM-DD optical system constraints [Invited]
Hany Elgala,Thomas D. C. Little +1 more
Reads0
Chats0
TLDR
In this article, a polar OFDM (P-OFDM) and single carrier frequency-domain equalization (SC-FDE) based on a polar representation of complex symbols is proposed.Abstract:
Recent studies have investigated the use of orthogonal frequency division multiplexing (OFDM) and single carrier frequency-domain equalization (SC-FDE) for gigabyte per second (Gpbs) short-range optical wired and wireless access networks based on direct intensitymodulation with direct detection (IM-DD). OFDM systems have an inherent high peak-to-average power ratio (PAPR). SC-FDE systems have lower PAPR and thus outperform comparable OFDM systems in terms of bit-error performance under various practical considerations, mainly the limited dynamic range of operation at the transmitter. In RF-based OFDM and SC-FDE systems, the output signal is bipolar, complex, and cannot be transmitted in IM-DD systems. Therefore, several power efficient schemes, however spectrally inefficient, have been proposed to make positive OFDM and SC-FDE signals, e.g., asymmetrically clipped optical OFDM (ACO-OFDM) and repetition and clipping optical SCFDE (RCO-SCFDE). To increase the data rate, novel OFDM and SC-FDE signal formats, called polar OFDM (P-OFDM) and polar SC-FDE (P-SC-FDE), based on a polar representation of complex symbols, are proposed. The proposed format offers twice as much spectral efficiency as state-of-the art unipolar OFDM and SC-FDE formats. Moreover, using a power allocation approach on the time-domain positive samples, the PAPR is further reduced, and the numerical evaluation of the bit-error performance under optical source power and dynamic range constraints demonstrates superior results toward Gpbs transmission.read more
Citations
More filters
Journal ArticleDOI
Channel Modeling and Characterization for Visible Light Communications
Farshad Miramirkhani,Murat Uysal +1 more
TL;DR: This study is based on ray tracing, which allows for an accurate description of the interaction of rays emitted from the lighting source within a specified confined space and is capable of obtaining channel impulse responses for any nonideal sources, as well as specular and mixed specular-diffuse reflections.
Journal ArticleDOI
Modulation Techniques for Li-Fi
Mohamed Sufyan Islim,Harald Haas +1 more
TL;DR: This paper surveys the suitable modulation techniques for Li-Fi including those which explore time,frequency and colour domains including thoseWhich are considered to offer a practical solution forLi-Fi.
Journal ArticleDOI
Multi-band carrier-less amplitude and phase modulation for bandlimited visible light communications systems
Paul Anthony Haigh,Son Thai Le,Stanislav Zvanovec,Zabih Ghassemlooy,Pengfei Luo,Tongyang Xu,Petr Chvojka,Thavamaran Kanesan,Elias Giacoumidis,Pep Canyelles-Pericas,Hoa Le Minh,Wasiu O. Popoola,Sujan Rajbhandari,Ioannis Papakonstantinou,Izzat Darwazeh +14 more
TL;DR: A new modulation scheme is introduced into the VLC domain; multiband carrier-less amplitude and phase modulation (m-CAP) and its performance within the context of bandlimited systems is described.
Journal ArticleDOI
Visible light communications towards 5G
TL;DR: Developing of such VLC links with a view to implementing ubiquitous broadcasting networks featuring advanced modulation formats such as orthogonal frequency division multiplexing (OFDM) or carrier-less amplitude and phase modulation (CAP) in conjunction with equalization techniques is discussed.
Journal ArticleDOI
Non-hermitian symmetry orthogonal frequency division multiplexing for multiple-input multiple-output visible light communications
Chen Chen,Wen-De Zhong,Dehao Wu +2 more
TL;DR: This paper investigates a non-Hermitian symmetry OFDM (NHS-OFDM) scheme for MIMO-VLC systems that achieves superior bit error rate (BER) performance to that using HS-OF DM, with lower or nearly the same computational complexity.
References
More filters
Journal ArticleDOI
Indoor optical wireless communication: potential and state-of-the-art
TL;DR: This article aims at reviewing and summarizing recent advancements in OW communication, with the main focus on indoor deployment scenarios, including a discussion of challenges, potential applications, state of the art, and prospects.
Journal ArticleDOI
Power efficient optical OFDM
Jean Armstrong,Arthur J. Lowery +1 more
TL;DR: A new technique for using orthogonal frequency division multiplexing (OFDM) in optical systems is presented, derived from a bipolar OFDM waveform by setting the negative values to zero.
Journal ArticleDOI
3.4 Gbit/s visible optical wireless transmission based on RGB LED
TL;DR: A gigabit-class indoor visible light communication system using commercially available RGB White LED and exploiting an optimized DMT modulation is experimentally realized and the resulting bit error ratios are the highest ever achieved in VLC systems.
Optical Fiber Communication Conference
Josep M. Fabrega,Michela Svaluto Moreolo,F. Javier Vilchez,Bijan Rahimzadeh Rofoee,Yanni Ou,Norberto Amaya Gonzalez,Georgios Zervas,Dimitra Simeonidou,Yuki Yoshida,Ken-ichi Kitayama +9 more
Journal ArticleDOI
Indoor broadcasting via white LEDs and OFDM
TL;DR: The physical layer implementation of a VLC system based on a modified version of the classical orthogonal frequency division multiplexing (OFDM) modulation technique is described and a hardware prototype for short-range broadcasting using a white LED lamp is presented.
Related Papers (5)
Comparison of ACO-OFDM, DCO-OFDM and ADO-OFDM in IM/DD Systems
Fundamental analysis for visible-light communication system using LED lights
T. Komine,Masao Nakagawa +1 more