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Comparison of Availability Performances of Simulated 850 nm/58 GHz and 850 nm/93 GHz Hybrid Systems

Vaclav Kvicera and Martin Grabner

International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2007)
San Diego, California (USA), July 16-18, 2007


Results of a propagation study on a 58 GHz link, a 93 GHz link and a free space optical link at 850 nm are presented. These three links have been operated simultaneously on the same an 850 m long path from December 2005 to August

2006. Individual attenuation events were compared with the concurrent meteorological situations and were classified according to the causes of their origin. The records of observed attenuation events were statistically processed. Cumulative distributions of attenuation due to all hydrometeors together as well as due to individual hydrometeors were obtained. The influences of individual hydrometeors were analysed and the availability performances of both the simulated 850 nm/58 GHz hybrid link and the 850 nm/93 GHz hybrid link were evaluated. It is concluded the significantly higher availability performances were achieved for the simulated FSO/RF hybrid systems than for the FSO link alone. The diversity improvement factor reached significant values for attenuation greater than 10 dB and the significant diversity gain was obtained for the percentages of time smaller than 1%.

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