TY - JOUR
T1 - Amplitude-coherent detection for optical wireless communications
T2 - Opportunities and limitations
AU - Al-Jarrah, Mohammad A.
AU - Al-Dweik, Arafat
AU - Park, Ki Hong
AU - Alouini, Mohamed Slim
N1 - Publisher Copyright:
© 2020 IEEE. All rights reserved.
PY - 2020
Y1 - 2020
N2 - The proliferation of ubiquitous computing applications created a multi-dimensional optimization problem that includes several conflicting variables such as spectral efficiency, complexity, power consumption, delay, and error probability. To relax the problem and provide efficient solutions, it was necessary to augment the currently overutilized radio spectrum with new frequency bands such as the optical spectrum, which can be used to off-load some of the traffic of certain applications. Therefore, this paper presents an efficient system design that uses amplitude-coherent (AC) detection to reduce the complexity of optical wireless communication systems (OWC), improve its reliability and spectral efficiency. More specifically, we use amplitude shift keying with orthogonal frequency division multiplexing (OFDM) at the transmitter, and AC detection at the receiver. The complexity reduction is achieved by using a low complexity detector, channel estimator, and peak-to-average power ratio (PAPR) reduction scheme. The spectral efficiency is achieved by using real data symbols with discrete cosine transform (DCT), which requires a subcarrier spacing that is 50% of the discrete Fourier transform (DFT), and does not require Hermitian symmetry to generate real-valued OFDM signals. Moreover, the derived channel estimator is blind, and the PAPR reduction scheme does not require a feedback overhead between the transmitter and receiver.
AB - The proliferation of ubiquitous computing applications created a multi-dimensional optimization problem that includes several conflicting variables such as spectral efficiency, complexity, power consumption, delay, and error probability. To relax the problem and provide efficient solutions, it was necessary to augment the currently overutilized radio spectrum with new frequency bands such as the optical spectrum, which can be used to off-load some of the traffic of certain applications. Therefore, this paper presents an efficient system design that uses amplitude-coherent (AC) detection to reduce the complexity of optical wireless communication systems (OWC), improve its reliability and spectral efficiency. More specifically, we use amplitude shift keying with orthogonal frequency division multiplexing (OFDM) at the transmitter, and AC detection at the receiver. The complexity reduction is achieved by using a low complexity detector, channel estimator, and peak-to-average power ratio (PAPR) reduction scheme. The spectral efficiency is achieved by using real data symbols with discrete cosine transform (DCT), which requires a subcarrier spacing that is 50% of the discrete Fourier transform (DFT), and does not require Hermitian symmetry to generate real-valued OFDM signals. Moreover, the derived channel estimator is blind, and the PAPR reduction scheme does not require a feedback overhead between the transmitter and receiver.
KW - Amplitude-coherent detection
KW - DCT-OFDM
KW - Free space optics
KW - FSO
KW - Optical communications
KW - OWC
KW - PAPR
KW - Semi-coherent detection
KW - Visible light communications
KW - VLC
UR - http://www.scopus.com/inward/record.url?scp=85090602855&partnerID=8YFLogxK
U2 - 10.1109/OJCOMS.2020.2991719
DO - 10.1109/OJCOMS.2020.2991719
M3 - Article
AN - SCOPUS:85090602855
SN - 2644-125X
VL - 1
JO - IEEE Open Journal of the Communications Society
JF - IEEE Open Journal of the Communications Society
M1 - 2991719
ER -