"\u010Cl\u00E1nek pojedn\u00E1v\u00E1 o koncepci kr\u00E1tkodob\u00E9 a dlouhodob\u00E9 chybovosti optick\u00E9ho spoje."@cs . "64-68" . "5"^^ . . "RIV/00216305:26220/07:PU69285!RIV08-GA0-26220___" . "2007-10-03+02:00"^^ . . "3"^^ . . . . . . "Proceedings of the 4th Scientific Conference with International Participation Communications and Information Information Technologies KIT 2007" . "455600" . . "P\u0159enosov\u00E9 vlastnosti optick\u00FDch atmosferick\u00FDch spoj\u016F"@cs . "Kolka, Zden\u011Bk" . "Tatransk\u00E9 Zruby" . . "Tatransk\u00E9 Zruby, Slovakia" . . . "The proposed paper deals with characterization of bit-error rate of free-space optical (FSO) links. The majority of commercially available links uses simple on-off keying for data transmission and is based on components developed for fiber applications. But the atmospheric optical channel differs significantly from optical fiber. Received optical power fluctuates due to atmospheric turbulences. The %22period%22 of fluctuations is in the order of milliseconds. The fluctuations cause short-term interruptions of data stream that interfere with communication protocols. For example, the interruptions decrease the congestion window of the TCP protocol. The actual data throughput is then a fraction of physical capacity of the link. A proper characterization of the channel is a key factor for the development of new communication protocols compatible with FSO." . "RIV/00216305:26220/07:PU69285" . "AFCEA" . "978-80-8040-325-6" . "[5660F923E021]" . . . "Transmission Properties of Free-Space Optical Links"@en . . "P\u0159enosov\u00E9 vlastnosti optick\u00FDch atmosferick\u00FDch spoj\u016F"@cs . . "Transmission Properties of Free-Space Optical Links" . . "Biolkov\u00E1, Viera" . . "Transmission Properties of Free-Space Optical Links" . "Kv\u00ED\u010Dala, Radek" . "P(GA102/05/0571), Z(MSM0021630513)" . "Free Space Optics, Digital links, BER testing"@en . "Transmission Properties of Free-Space Optical Links"@en . . "The proposed paper deals with characterization of bit-error rate of free-space optical (FSO) links. The majority of commercially available links uses simple on-off keying for data transmission and is based on components developed for fiber applications. But the atmospheric optical channel differs significantly from optical fiber. Received optical power fluctuates due to atmospheric turbulences. The %22period%22 of fluctuations is in the order of milliseconds. The fluctuations cause short-term interruptions of data stream that interfere with communication protocols. For example, the interruptions decrease the congestion window of the TCP protocol. The actual data throughput is then a fraction of physical capacity of the link. A proper characterization of the channel is a key factor for the development of new communication protocols compatible with FSO."@en . . "3"^^ . "26220" . .