期刊
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
卷 15, 期 9, 页码 6502-6512出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2016.2585486
关键词
Free-space optical; log-normal fading; gammagamma fading; ergodic capacity; asymptotic; high SNR; pointing errors; Beckmann distribution; correlated branches
Free-space optical (FSO) communication systems are negatively affected by two physical phenomenon, namely, scintillation due to atmospheric turbulence and pointing errors. To quantify the effect of these two factors on FSO system performance, we need an effective mathematical model for them. In this paper, we propose and study a generalized pointing error model based on the Beckmann distribution. We then derive a generic expression of the asymptotic capacity of FSO systems under the joint impact of turbulence and generalized pointing error impairments. Finally, the asymptotic channel capacity formula is extended to quantify the FSO systems performance with selection and switched-and-stay diversity.
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