期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 25, 期 7, 页码 1702-1710出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2007.899174
关键词
atmospheric turbulence; beam misalignment; free-space optical (FSO) communications; optical channel capacity; outage probability; pointing errors
We investigate the performance and design of free-space optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the optical intensity fluctuation at the receiver due to the combined effects of atmospheric turbulence and pointing errors is derived. Unlike earlier work, our model considers the effect of beam width, detectors size, and jitter variance explicitly. Expressions for the outage probability are derived for a variety of atmospheric conditions. For given weather and misalignment conditions, the beam width is optimized to maximize the channel capacity subject to outage. Large gains in achievable rate are realized versus using a nominal beam width. In light fog, by optimizing the beam width, the achievable rate is increased by 80% over the nominal beam width at an outage probability of 10(-5). Well-known error control codes are then applied to the channel and shown to realize much of the achievable gains.
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