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Iterative receiver for hybrid asymmetrically clipped optical OFDM

Iterative receiver for hybrid asymmetrically clipped optical OFDM
Iterative receiver for hybrid asymmetrically clipped optical OFDM
This paper proposes an iterative receiver to enhance the performance of hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (HACO-OFDM) in optical wireless communication systems. In HACO-OFDM scheme, asymmetrically clipped optical OFDM (ACO-OFDM) and pulse-amplitude-modulated discrete multitone (PAM-DMT) signals are transmitted simultaneously, which is more spectrally efficient compared with ACO-OFDM and PAM-DMT. However, the existing HACO-OFDM receiver directly recovers the signals in the frequency domain, which could not eliminate the interference thoroughly between ACO-OFDM and PAM-DMT signals and limits its performance. In our proposed receiver, the ACO-OFDM and PAM-DMT signals are detected in the frequency domain and regenerated in the time domain. After that, they are subtracted from the received signals iteratively. Thus, ACO-OFDM and PAM-DMT signals can be distinguished. By taking advantage of the signal symmetry properties of ACO-OFDM and PAM-DMT in the time domain, pairwise clipping is utilized to further reduce the effect of noise and estimation error, resulting in improved performance. In addition, unequal power allocation is proposed to guarantee that ACO-OFDM and PAM-DMT signals have similar performance in HACO-OFDM systems. Simulation results show that the proposed method provides significant signal-to-noise ratio gain over the conventional receiver for both equal and unequal power allocations at the cost of slightly increased complexity.
0733-8724
4471-4477
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d

Wang, Qi, Wang, Zhaocheng and Dai, Linglong (2014) Iterative receiver for hybrid asymmetrically clipped optical OFDM. Journal of Lightwave Technology, 32 (22), 4471-4477. (doi:10.1109/JLT.2014.2358611).

Record type: Article

Abstract

This paper proposes an iterative receiver to enhance the performance of hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (HACO-OFDM) in optical wireless communication systems. In HACO-OFDM scheme, asymmetrically clipped optical OFDM (ACO-OFDM) and pulse-amplitude-modulated discrete multitone (PAM-DMT) signals are transmitted simultaneously, which is more spectrally efficient compared with ACO-OFDM and PAM-DMT. However, the existing HACO-OFDM receiver directly recovers the signals in the frequency domain, which could not eliminate the interference thoroughly between ACO-OFDM and PAM-DMT signals and limits its performance. In our proposed receiver, the ACO-OFDM and PAM-DMT signals are detected in the frequency domain and regenerated in the time domain. After that, they are subtracted from the received signals iteratively. Thus, ACO-OFDM and PAM-DMT signals can be distinguished. By taking advantage of the signal symmetry properties of ACO-OFDM and PAM-DMT in the time domain, pairwise clipping is utilized to further reduce the effect of noise and estimation error, resulting in improved performance. In addition, unequal power allocation is proposed to guarantee that ACO-OFDM and PAM-DMT signals have similar performance in HACO-OFDM systems. Simulation results show that the proposed method provides significant signal-to-noise ratio gain over the conventional receiver for both equal and unequal power allocations at the cost of slightly increased complexity.

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More information

Accepted/In Press date: 13 September 2014
e-pub ahead of print date: 17 September 2014
Published date: 15 November 2014
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 400624
URI: http://eprints.soton.ac.uk/id/eprint/400624
ISSN: 0733-8724
PURE UUID: 5fd36aba-a233-4de0-90b6-87a32ff456d5

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Date deposited: 19 Sep 2016 15:40
Last modified: 27 Oct 2023 15:32

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Contributors

Author: Qi Wang
Author: Zhaocheng Wang
Author: Linglong Dai

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