What is it about?
Channel capacity is a fundamental measure of the maximum amount of information which can be conveyed through a channel reliably. During transmission, the transmitted Free Space Optics signal is exposed to various effects such as atmospheric turbulence and misalignment between the transmitter and receiver (pointing error). One of the more effective ways to reduce the impact of these detrimental effects is the use of adaptive transmission. We have shown the use of different adaptive transmission algorithms in order to increase the reliability and capacity of the channel.
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Why is it important?
We have carried out a detailed analysis of channel capacity for different atmospheric turbulence strengths by using different adaptive transmission algorithms. The analysis was performed for IM/DD and heterodyne detection. The obtained analytical results were confirmed by Monte Carlo simulation. Also, the approximation for high SNR values is given. From the presented results, important conclusions can be drawn: how the strength of atmospheric turbulence affects the capacity, which algorithm has the advantage of a certain turbulence strength, which detection is better and when it is more practical to use.
Read the Original
This page is a summary of: Comparison of adaptive algorithms for free space optical transmission in Malaga atmospheric turbulence channel with pointing errors, IET Communications, March 2019, the Institution of Engineering and Technology (the IET), DOI: 10.1049/iet-com.2018.5666.
You can read the full text:
In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight pointing errors are graphically presented.
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