On the Capacity Region of Optical Intensity Broadcast Channels

This paper investigates the capacity region of the optical intensity broadcast channels (OI-BCs), where the input is subject to a peak-intensity constraint, an average-intensity constraint, or both. By leveraging the decomposition results of several random variables, i.e., uniform, exponential, and...

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Bibliographic Details
Published in:IEEE transactions on communications 2024-04, Vol.72 (4), p.1967-1982
Main Authors: Yang, Sufang, Li, Longguang, Wang, Jintao
Format: Article
Language:English
Subjects:
Asymptotic properties
Capacity region
Channel capacity
Channels
Encoding
High-speed optical techniques
Integrated optics
intensity modulation-direct detection
optical broadcast channel
optical wireless communication
peak- or/and average-intensity constraints
Random variables
Signal to noise ratio
Wireless communication
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Summary:This paper investigates the capacity region of the optical intensity broadcast channels (OI-BCs), where the input is subject to a peak-intensity constraint, an average-intensity constraint, or both. By leveraging the decomposition results of several random variables, i.e., uniform, exponential, and truncated exponential random variables, and adopting a superposition coding (SC) scheme, the inner bound on the capacity region is derived. Then, the outer bound is derived by applying the conditional entropy power inequality (EPI). In the high signal-to-noise ratio (SNR) regime, the inner bound asymptotically matches the outer bound, thus characterizing the high-SNR asymptotic capacity region. The bounds are also extended to the general K -user BCs without loss of high-SNR asymptotic optimality.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2023.3345384