Diversity reduction implementation in fso

[voodi venkata sudheer]

hi,

iam working on fso. i want to implement diversity for fading reduction which requires cosimulation of optisym and matlaab…..if any one is having the idea of diversity technique implementation in fso using optisym…pls tell me…

[alistu]

Hi Voodi,

If you have already chosen the diversity scheme from a paper and you are want to know how to implement it using OptiSystem and Matlab, the first thing you should do is to carefully go through the Matlab co-simulation tutorials in OptiSystem. You can access them in OptiSystem samples folder on your PC. You can also find some videos on Optiwave website in this regard.

Regards

[umer ashraf wani]

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[burhan num mina llah]

Hello Voodi,

Fading is a major impairment in transmitting the signal in wireless communication. Thus, it becomes very necessary to nullify its effect to transmit the signal successfully and so the diversity technique along with its different types is being employed to combat the effect of fading.
Fading is a major impairment in transmitting the signal in wireless communication. Thus, it becomes
very necessary to nullify its effect to transmit the signal successfully and so the diversity technique along with its different types is being employed to combat the effect of fading.
For not-too-large aperture sizes, fading is more destructive for moderate turbulence than for strong turbulence conditions. The trade-off between link margin and outage capacity is especially important for moderate to strong turbulence conditions. Use of multiple apertures permits a substantial gain to be achieved in the outage capacity. Channel coding is efficient only for significantly reduced turbulence. The achieved performance improvement by aperture averaging is more significant for higher-order modulations like Q-ary PPM.

Refer to the following link. It will surely help.
https://www.researchgate.net/publication/224083258_Fading_Reduction_by_Aperture_Averaging_and_Spatial_Diversity_in_Optical_Wireless_Systems

Regards

Burhan

[Aabid Baba]

Hello Voodi Venkata,
As far as your query is concerned i would like to mention that When the aperture size is relatively small so that the aperture averaging benefit is poor, we can perform channel coding and interleaving over long enough frames (with respect to the channel coherence time or use delayed copies of data streams in order to benefit from some time diversity. When using a relatively large aperture size, however, exploiting
time diversity becomes practically infeasible. In fact, assuming that the channel time variations are mostly due to the transversal wind (with respect to the optical axis), the use of a relatively large aperture size results in a large effective channel coherence time. Indeed,
by this assumption and considering the Taylor hypothesis of frozen atmosphere, the spatial and temporal channel coordinates are related through the speed of the transversal wind V [31]. The temporal evolution of the turbulence being due to V, by aperture averaging, we also average over the channel time variations.Consequently, to benefit from time diversity, we have to use interleaver sizes that are too large or to introduce large delays between multiple transmissions of a data stream. This, in turn, imposes delay latencies that are too long and necessitates the use of huge memory sizes at the receiver. As a matter of fact, the Taylor hypothesis is somewhat pessimistic. In practice
and for long transmission ranges, we have slightly shorter c than that predicted by the Taylor model, due to turbulence boiling.
You may refer to this link for further information.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5338662
https://www.osapublishing.org/jocn/viewmedia.cfm?uri=jocn-1-6-580&seq=0

Regards

[Hamza Ali Abbas Khan]

Hello

I suggest you to refer to this following link. It may be of some help.
https://www.researchgate.net/publication/224083258_Fading_Reduction_by_Aperture_Averaging_and_Spatial_Diversity_in_Optical_Wireless_Systems
Thanks
Regards

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