Asymmetrically Clipped Optical Hadamard Coded Modulation (ACO-HCM)

In many optical wireless communications systems, power efficiency is paramount. In others, flexibility is important. To achieve these goals, this paper presents a novel transmission scheme dubbed asymmetrically clipped optical Hadamard coded modulation (ACO-HCM) . ACO-HCM combines the characteristic...

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Bibliographic Details
Published in:IEEE photonics journal 2023-02, Vol.15 (1), p.1-12
Main Authors: Schulze, Henrik, Hoeher, Peter A.
Format: Article
Language:English
Subjects:
Adaptive optics
Asymmetry
Code Division Multiple Access
Error analysis
Error correction codes
Fourier transforms
Hadamard transform
intensity modulation
Linear receivers
Maximum likelihood estimation
Modulation
Nonlinear optics
OFDM
OFDM modulation
Optical modulation
Optical receivers
optical wireless communication
Orthogonal Frequency Division Multiplexing
Power efficiency
visible light communication
Waveforms
Wireless communication systems
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Summary:In many optical wireless communications systems, power efficiency is paramount. In others, flexibility is important. To achieve these goals, this paper presents a novel transmission scheme dubbed asymmetrically clipped optical Hadamard coded modulation (ACO-HCM) . ACO-HCM combines the characteristics of real-valued non-negative orthogonal frequency-division multiplexing (OFDM) and Hadamard coded modulation (HCM). Unlike OFDM, which is based on the Fourier transform and therefore delivers a continuous waveform, ACO-HCM provides a discrete set of amplitudes. This feature is desirable for nonlinear channels. Error probabilities are analytically calculated for a linear receiver similar to the decorrelation receiver in direct-sequence code-division multiple access (DS-CDMA). Maximum-likelihood sequence estimation is also investigated and shown to outperform the linear receiver, particularly in the presence of a time-dispersive channel. The peak-to-average power ratio of ACO-HCM is derived for the electrical as well as the optical domain in closed form.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2023.3237959