Amplitude-Coherent Detection for Optical Wireless Communications: Opportunities and Limitations
Type
ArticleKAUST Department
Communication Theory LabComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Date
2020Permanent link to this record
http://hdl.handle.net/10754/662723
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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.Citation
Al-Jarrah, M. A., Al-Dweik, A., Park, K.-H., & Alouini, M.-S. (2020). Amplitude-Coherent Detection for Optical Wireless Communications: Opportunities and Limitations. IEEE Open Journal of the Communications Society, 1–1. doi:10.1109/ojcoms.2020.2991719Additional Links
https://ieeexplore.ieee.org/document/9084133/https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9084133
https://doi.org/10.1109/ojcoms.2020.2991719
ae974a485f413a2113503eed53cd6c53
10.1109/OJCOMS.2020.2991719
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