Amplify-and-forward two-way relaying system over free-space optics channels

• Published in: Journal of communications and networks Vol. 19; no. 5; pp. 481 - 492
• Main Authors: Park, Jaedon, Chae, Chan-Byoung, Yoon, Giwan
• Format: Journal Article
• Language: English
• Published: Seoul Editorial Department of Journal of Communications and Networks 01.10.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); 한국통신학회
• Subjects: Adaptive optics; Amplify-and-forward relay; Atmospheric turbulence; Attenuation; average probability of error; Binary phase shift keying; Channels; Codes; Communications systems; Fading channels; Free-space optical communication; free-space optics; Lower bounds; Optical wireless; overall outage probability; pointing errors; Power series; Power system reliability; Probability; Relaying; Relays; subcarrier intensity modulation; Subcarriers; two-wayrelaying system; upper and lower bounds; 전자/정보통신공학
• ISSN: 1229-2370; 1976-5541
• DOI: 10.1109/JCN.2017.000080

In this paper, we analyze the performance of a two-way subcarrier intensity-modulated (SIM) amplify-and-forward (AF) relaying system over free-space optics (FSO) communication channels. The analysis takes into consideration attenuations due to atmospheric turbulence, geometric spread and pointing errors at the same time. We derive, in generalized infinite power series expressions, the tight upper and lower bounds of the overall outage probability and average probability of errors of the system. The study finds that this two-way subcarrier intensity-modulated AF relaying system using a binary phase shift keying (BPSK) modulation could be used for practical applications in case of a weak turbulence regime in which the required SNR is about 30 dB to obtain the average bit error probability of 10-6. It is also noted that the pointing errors clearly degrade the performance of the two-way subcarrier intensity-modulated AF relaying system.