Специальный выпуск "Спутниковая связь и вещание"-2010

Ë ANSI (American Standard Institute). Ä̇Îӄ˘Ì˚ ӈÂÌÍË ÏÓÊÌÓ ‚˚ÔÓÎ- ÌËÚ¸ Ë ‰Îfl ‰Û„Ëı ÌÓÏË̇ÎÓ‚ ÒÍÓÓ- ÒÚÂÈ ÔÂ‰‡˜Ë ËÌÙÓχˆËË, ÌÓ Â- ÁÛÎ¸Ú‡Ú ·Û‰ÂÚ ÔËÏÂÌÓ ÚÂÏ Ê (˝Ù- ÙÂÍÚË‚ÌÓÒÚ¸ ·Û‰ÂÚ ÌÂÏÌÓ„Ó Ô‡‰‡Ú¸ ‰Îfl ͇̇· 128 ÍËÎÓÒËÏ‚ÓÎÓ‚ ‚ ÒÂÍÛÌ- ‰Û Ë ÌÂÁ̇˜ËÚÂθÌÓ Û‚Â΢˂‡Ú¸Òfl Ò Û‚Â΢ÂÌËÂÏ ÒÍÓÓÒÚË, ËÁÏÂÌflfl η h ‚ ÚÂÚ¸ÂÏ Á̇ÍÂ). Итог óËÒÎÂÌ̇fl ÓˆÂÌ͇ ˝ÙÙÂÍÚË‚ÌÓÒÚË Ó·- ‡ÚÌÓ„Ó Í‡Ì‡Î‡ TDMA, Ô‰ÒÚ‡‚ÎÂÌ- ̇fl ‚ Ú‡·Î. 2–5, ÔÓ͇Á˚‚‡ÂÚ, ˜ÚÓ Â ÒÓ- ‚ÓÍÛÔÌÓ Á̇˜ÂÌË ξ Q = η s η h Á‡ÏÂÚÌÓ ÌËÊ 1 (ÓÒÓ·ÂÌÌÓ ‰Îfl ÍÓÓÚÍËı Ô‡ÍÂ- ÚÓ‚, ı‡‡ÍÚÂÌ˚ı, ̇ÔËÏÂ, ‰Îfl Ú‡- ÙË͇ ÚÂÎÂÙÓÌËË ËÎË Ú‡ÌÁ‡ÍˆËÈ). èË ˝ÚÓÏ Ò Û‚Â΢ÂÌËÂÏ ˜ËÒ· ‡ÍÚË‚- Ì˚ı VSAT-Òڇ̈ËÈ, ‡·ÓÚ‡˛˘Ëı ‚ Ó·‡ÚÌÓÏ Í‡Ì‡ÎÂ, Â„Ó ˝ÙÙÂÍÚË‚ÌÓÒÚ¸ ÒÌËʇÂÚÒfl. ùÚÓ ËÎβÒÚËÛÂÚÒfl ̇ ËÒ. 2 Ë 3 (‰Îfl ÓÒÌÓ‚Ì˚ı Òڇ̉‡ÚÓ‚ ËÌÚÂ‡ÍÚË‚Ì˚ı VSAT). è‰ÒÚ‡‚ÎÂÌ- Ì˚ ‰‡ÌÌ˚ ÔÓÎÛ˜ÂÌ˚ ‰Îfl ͇̇ÎÓ‚ ÒÓ ÒÍÓÓÒÚflÏË 256–320 ÍËÎÓÒËÏ‚ÓÎÓ‚ ‚ ÒÂÍÛ̉Û, Ӊ̇ÍÓ Ë ÔË ËÌ˚ı ÒÍÓÓ- ÒÚflı ÂÁÛÎ¸Ú‡Ú Ì ·Û‰ÂÚ Á‡ÏÂÚÌÓ ÓÚÎË- ˜‡Ú¸Òfl ÓÚ ËÒ. 2 Ë 3. ÖÒÎË ÓËÂÌÚËÓ‚‡Ú¸Òfl ̇ Ó·˙ÂÏ IP- Ô‡ÍÂÚÓ‚, ÔÂ‰‡‚‡ÂÏ˚È ‚ ‰ËÌËˆÛ ‚ÂÏÂÌË ∆ t, ÚÓ ·ËÚÓ‚‡fl ÒÍÓÓÒÚ¸ ‚ ÒÔÛÚÌËÍÓ‚ÓÏ Í‡Ì‡Î ‰ÓÎÊ̇ ÔÓ‰˜Ë- ÌflÚ¸Òfl ÌÂ‡‚ÂÌÒÚ‚Û: R b ≥ 8Q ip /( ∆ t• η s • η h ), (14) ÍÓÚÓÓ ۘËÚ˚‚‡ÂÚ ˝ÙÙÂÍÚË‚ÌÓÒÚ¸ Ô‡‚ËÎ ÔÂ‰‡˜Ë ËÌÙÓχˆËË Ì‡ ͇- ̇θÌÓÏ Ë ÙËÁ˘ÂÒÍÓÏ ÛÓ‚Ìflı. èË Á‡Í‡Á ÒÔÛÚÌËÍÓ‚Ó„Ó ÂÒÛÒ‡, ÌÂÓ·ıÓ‰ËÏÓ„Ó ‰Îfl Ó·ÂÒÔ˜ÂÌËfl Á‡‰‡Ì- ÌÓÈ ÔÓÔÛÒÍÌÓÈ ÒÔÓÒÓ·ÌÓÒÚË Ó·‡Ú- Ì˚ı TDMA-͇̇ÎÓ‚, ÒΉÛÂÚ Û˜ËÚ˚- ‚‡Ú¸ ÓÒÓ·ÂÌÌÓÒÚË Ëı Ó„‡ÌËÁ‡ˆËË, ÒÓ- ÔflÊÂÌÌ˚Â Ò ÌÂËÁ·ÂÊÌ˚ÏË Ì‡Í·‰- Ì˚ÏË ‡ÒıÓ‰‡ÏË Ì‡ ͇̇θÌÓÏ ÛÓ‚ÌÂ Ë ÙËÁ˘ÂÒÍÓÏ ÛÓ‚ÌÂ. ä‡Í ÔÓ͇Á˚‚‡˛Ú Ô‰ÒÚ‡‚ÎÂÌÌ˚ ‚ Òڇڸ ÂÁÛθڇÚ˚, ̇Í·‰Ì˚ ‡ÒıÓ‰˚ ÏÓ„ÛÚ ‰ÓÒÚË„‡Ú¸ ‰ÂÒflÚÍÓ‚ ÔÓˆÂÌÚÓ‚, ˜ÚÓ Á‡ÏÂÚÌÓ Û‚Â΢˂‡ÂÚ Ú·ÛÂÏÛ˛ ÔÓ- ÎÓÒÛ ˜‡ÒÚÓÚ Ó·‡ÚÌ˚ı ͇̇ÎÓ‚ TDMA ‚ ËÌÚÂ‡ÍÚË‚Ì˚ı ÒÂÚflı VSAT (ÔÓ Ò‡‚- ÌÂÌ˲, ̇ÔËÏÂ, Ò Í‡Ì‡ÎÓÏ SCPC). Литература 1. ÄÌÔËÎÓ„Ó‚ Ç.ê. ùÙÙÂÍÚË‚ÌÓÒÚ¸ ÒÔÛÚÌËÍÓ‚˚ı ͇̇ÎÓ‚ ‚ IP-ÒÂÚË ÔÂÂ- ‰‡˜Ë ‰‡ÌÌ˚ı // ëÔˆˇθÌÓ ÔË- ÎÓÊÂÌËÂ Í ÊÛ̇ÎÛ íëë "ëÔÛÚÌËÍÓ- ‚‡fl Ò‚flÁ¸ Ë ‚¢‡ÌËÂ-2008". ëÚ. 64–66. 2. ETSI TR 101 790 v.1.3.1 (2006-09), Digital Video Broadcasting (DVB); Interaction Channel for Satellite Di- stribution Systems; Guideline for the Use of EN 301 790-V1.2.1. 3. EN 301 790-V1.3.1 Digital Video Broadcasting (DVB); Interaction Channel for Satellite Distribution Sy- stems. 4. ETSI TS 102 354, IP over Satellite, 2006. 5. TIA-1008, IP over Satellite, October 2003. 6. ANSI/SCTE23-1 2005, American National Standard, DOCSIS 1.1 Part 1: RF Interface. 7. ITU-R S.1709, Technical Cha- racteristics Óf Air Interfaces for Global Broadband Satellite Sy- stems, 2005. ● 93 2010 ëèìíçàäéÇÄü ëÇüáú à ÇÖôÄçàÖ www.tssonline.ru/imag.php Все наши издания по телекоммуникациям на вашем компьютере ● ПРОСМОТР ● ПОИСК ● ПЕЧАТЬ ● НАВИГАЦИЯ ● ИНТЕРНЕТ-ССЫЛКИ