Investigation on iterative multiuser detection physical layer network coding in two-way relay free-space optical links with turbulences and pointing errors

Abualmaalie, Zina, Ghassemlooy, Zabih, Bhatnagar, Manav, Le Minh, Hoa, Aslam, Nauman, Liaw, Shien-Kuei and Lee, It Ee (2016) Investigation on iterative multiuser detection physical layer network coding in two-way relay free-space optical links with turbulences and pointing errors. Applied Optics, 55 (33). p. 9396. ISSN 0003-6935

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Official URL: http://dx.doi.org/10.1364/AO.55.009396

Abstract

Physical layer network coding (PNC) improves the throughput in wireless networks by enabling two nodes to exchange information using a minimum number of time slots. The PNC technique is proposed for two-way relay channel free space optical (TWR-FSO) communications with the aim of maximizing the utilization of network resources. The multipair TWR-FSO is considered in this paper, where a single antenna on each pair seeks to communicate via a common receiver aperture at the relay. Therefore, chip interleaving is adopted as a technique to separate the different transmitted signals at the relay node to perform PNC mapping. Accordingly, this scheme relies on the iterative multiuser technique for detection of users at the receiver. The bit error rate (BER) performance of the proposed system is examined under the combined influences of atmospheric loss, turbulence-induced channel fading, and pointing errors (PEs). By adopting the joint PNC mapping with interleaving and multiuser detection techniques, the BER results show that the proposed scheme can achieve a significant performance improvement against the degrading effects of turbulences and PEs. It is also demonstrated that a larger number of simultaneous users can be supported with this new scheme in establishing a communication link between multiple pairs of nodes in two time slots, thereby improving the channel capacity.

Item Type: Article
Additional Information: © 2016 Optical Society of America.]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Ellen Cole
Date Deposited: 06 Dec 2016 11:43
Last Modified: 09 May 2017 22:27
URI: http://nrl.northumbria.ac.uk/id/eprint/28778

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