Turbulence mitigation scheme based on multiple-user detection in an orbital-angular-momentum multiplexed system

doi:10.1088/1674-1056/25/11/114215

Abstract Atmospheric turbulence (AT) induced crosstalk can significantly impair the performance of a free-space optical (FSO) communication link using orbital angular momentum (OAM) multiplexing. In this paper, we propose a multiple-user detection (MUD) turbulence mitigation scheme in an OAM-multiplexed FSO communication link. First, we present a MUD equivalent communication model for an OAM-multiplexed FSO communication link under AT. In the equivalent model, each input bit stream represents one user's information. The deformed OAM spatial modes caused by AT, instead of the pure OAM spatial modes, are used as information carriers, and the overlapping between the deformed OAM spatial modes are computed as the correlation coefficients between the users. Then, we present a turbulence mitigation scheme based on MUD idea to enhance AT tolerance of the OAM-multiplexed FSO communication link. In the proposed scheme, the crosstalk caused by AT is used as a useful component to deduce users' information. The numerical results show that the performance of the OAM-multiplexed communication link has greatly improved by the proposed scheme. When the turbulence strength C_3in² is 1×10^-15 m^-2/3, the transmission distance is 1000 m and the channel signal-to-noise ratio (SNR) is 26 dB, the bit-error-rate (BER) performance of four spatial multiplexed OAM modes l_m=+1,+2,+3,+4 are all close to 10^-5, and there is a 2-3 fold increase in the BER performance in comparison with those results without the proposed scheme. In addition, the proposed scheme is more effective for an OAM-multiplexed FSO communication link with a larger OAM mode topological charge interval. The proposed scheme is a promising direction for compensating the interference caused by AT in the OAM-multiplexed FSO communication link.

Keywords: orbital angular momentum atmospheric turbulence free-space optical multiple-user detection

Received: 21 March 2016
Revised: 26 June 2016
Accepted manuscript online:

PACS:	42.79.Sz	(Optical communication systems, multiplexers, and demultiplexers?)
	42.68.Bz	(Atmospheric turbulence effects)
	42.25.Hz	(Interference)
	42.50.Tx	(Optical angular momentum and its quantum aspects)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61271238 and 61475075), the Open Research Fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, China (Grant No. NYKL2015011), the Postgraduate Innovation Research Plan of Jiangsu Province, China (Grant No. CXZZ13 0489), and the University Natural Science Foundation of Jiangsu Province, China (Grant No. 16KJB510037).

Corresponding Authors: Sheng-Mei Zhao
E-mail: zhaosm@njupt.edu.cn

Cite this article:

Li Zou(邹丽), Le Wang(王乐), Sheng-Mei Zhao(赵生妹), Han-Wu Chen(陈汉武) Turbulence mitigation scheme based on multiple-user detection in an orbital-angular-momentum multiplexed system 2016 Chin. Phys. B 25 114215

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Turbulence mitigation scheme based on multiple-user detection in an orbital-angular-momentum multiplexed system

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