A closed-form expression for performance optimization of subcarrier intensity QAM signals-based relay-added FSO systems with APD

Ha Duyen Trung, Nguyen Tien Hoa, Nguyen Huu Trung, Tomoaki Ohtsuki

研究成果: Article査読

6 被引用数 (Scopus)

抄録

This study characterizes the overall bit-error-rate (BER) performance optimization of avalanche photodiode (APD) receiver-based amplify-and-forward (AF) relay-added free-space optical (FSO) communication system. The system of interest uses subcarrier intensity quadrature amplitude modulation (QAM) signals and subjects to scintillation due to optical turbulence. A weak atmospheric turbulence (clear-air condition) scenario is considered, for which the received signal intensity fluctuation can be modeled as a log-normal random process. A closed-form expression of the overall BER is derived by taking into account the impact of atmospheric loss, turbulence strength, thermal-noise and shot-noise limited conditions. It can be inferred from the numerical results that using AF relay nodes can extend the transmission distance and minimize BER performance of FSO system significantly compared with the direct transmission. Moreover, the selection of APD's gain values is indispensable to minimize the system's BER performance. Hence, the designed system could achieve the minimal BER by selecting an optimal APD gain value appropriately. In addition, the optimal gain values of APD significantly depend on various conditions, such as noise temperature, link distance, and the number of relay nodes.

本文言語English
ページ(範囲)203-211
ページ数9
ジャーナルPhysical Communication
31
DOI
出版ステータスPublished - 2018 12月

ASJC Scopus subject areas

  • 電子工学および電気工学

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