title: Formula for the average bit error rate of free-space optical systems with dual-branch equal-gain combining over gamma-gamma turbulence channels.
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.
authors: State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China. yixiang@xidian.edu.cn
authors: Xiang
authors: X
authors: Yi
authors: Zengji
authors: Z
authors: Liu
authors: Peng
authors: P
authors: Yue