Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/151374
Title: Capacity Bounds for the Gaussian IM-DD Optical Multiple-Access Channel
Authors: Anas Chaaban;Omer Mahmoud S. Al-Ebraheemy;Tareq Y. Al-Naffouri;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: Optical wireless communications (OWC) is a promising technology for closing the mismatch between the growing number of connected devices and the limited wireless network capabilities. Similar to downlink, uplink can also benefit from OWC for establishing connectivity between such devices and an optical access point. In this context, the incoherent intensity-modulation and direct-detection (IM-DD) scheme is desirable in practice. Hence, it is important to understand the fundamental limits of communication rates over an OWC uplink employing IM-DD, i.e., the channel capacity. This uplink, modeled as a Gaussian multiple-access channel (MAC) for indoors OWC, is studied in this paper, under the IM-DD constraints, which form the main difference with the standard Gaussian MAC commonly studied in the radio-frequency context. Capacity region outer and inner bounds for this channel are derived. The bounds are fairly close at high signal-to-noise ratio (SNR), where a truncated-Gaussian input distribution achieves the capacity region within a constant gap. Furthermore, the bounds coincide at low SNR showing the optimality of ON-OFF keying combined with successive cancellation decoding in this regime. At moderate SNR, an optimized uniformly spaced discrete input distribution achieves fairly good performance.
URI: http://localhost/handle/Hannan/151374
volume: 16
issue: 5
More Information: 3328,
3340
Appears in Collections:2017

Files in This Item:
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7880596.pdf964.91 kBAdobe PDF
Title: Capacity Bounds for the Gaussian IM-DD Optical Multiple-Access Channel
Authors: Anas Chaaban;Omer Mahmoud S. Al-Ebraheemy;Tareq Y. Al-Naffouri;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: Optical wireless communications (OWC) is a promising technology for closing the mismatch between the growing number of connected devices and the limited wireless network capabilities. Similar to downlink, uplink can also benefit from OWC for establishing connectivity between such devices and an optical access point. In this context, the incoherent intensity-modulation and direct-detection (IM-DD) scheme is desirable in practice. Hence, it is important to understand the fundamental limits of communication rates over an OWC uplink employing IM-DD, i.e., the channel capacity. This uplink, modeled as a Gaussian multiple-access channel (MAC) for indoors OWC, is studied in this paper, under the IM-DD constraints, which form the main difference with the standard Gaussian MAC commonly studied in the radio-frequency context. Capacity region outer and inner bounds for this channel are derived. The bounds are fairly close at high signal-to-noise ratio (SNR), where a truncated-Gaussian input distribution achieves the capacity region within a constant gap. Furthermore, the bounds coincide at low SNR showing the optimality of ON-OFF keying combined with successive cancellation decoding in this regime. At moderate SNR, an optimized uniformly spaced discrete input distribution achieves fairly good performance.
URI: http://localhost/handle/Hannan/151374
volume: 16
issue: 5
More Information: 3328,
3340
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7880596.pdf964.91 kBAdobe PDF
Title: Capacity Bounds for the Gaussian IM-DD Optical Multiple-Access Channel
Authors: Anas Chaaban;Omer Mahmoud S. Al-Ebraheemy;Tareq Y. Al-Naffouri;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: Optical wireless communications (OWC) is a promising technology for closing the mismatch between the growing number of connected devices and the limited wireless network capabilities. Similar to downlink, uplink can also benefit from OWC for establishing connectivity between such devices and an optical access point. In this context, the incoherent intensity-modulation and direct-detection (IM-DD) scheme is desirable in practice. Hence, it is important to understand the fundamental limits of communication rates over an OWC uplink employing IM-DD, i.e., the channel capacity. This uplink, modeled as a Gaussian multiple-access channel (MAC) for indoors OWC, is studied in this paper, under the IM-DD constraints, which form the main difference with the standard Gaussian MAC commonly studied in the radio-frequency context. Capacity region outer and inner bounds for this channel are derived. The bounds are fairly close at high signal-to-noise ratio (SNR), where a truncated-Gaussian input distribution achieves the capacity region within a constant gap. Furthermore, the bounds coincide at low SNR showing the optimality of ON-OFF keying combined with successive cancellation decoding in this regime. At moderate SNR, an optimized uniformly spaced discrete input distribution achieves fairly good performance.
URI: http://localhost/handle/Hannan/151374
volume: 16
issue: 5
More Information: 3328,
3340
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7880596.pdf964.91 kBAdobe PDF