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Updated: May 13, 2026

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Formula for the average bit error rate of free-space optical systems with dual-branch equal-gain combining over
Xiang Yi1, Zengji Liu, Peng Yue
1State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China. yixiang@xidian.edu.cn
Abstract:
In this Letter we propose a closed-form expression for the average bit error rate of intensity modulation/direct detection free-space optical systems employing dual-branch equal-gain combining and operating over turbulence channels. To offer a realistic error performance of the considered system we assume that both branches undergo independent but not necessarily identically distributed gamma-gamma fading. Our newly developed formula is obtained in terms of the bivariate H-Fox function, which can be readily evaluated based on its two-fold Mellin-Barnes representation. Numerically evaluated and computer simulation results are presented that verify the accuracy of the proposed mathematical analysis.
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