Browsing by Author "MUHAMMAD IMRAN AZAM"
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Item Restricted Impact of variability of Nakagami-m parameter on the performance of digital communication systems(Saudi Digital Library) MUHAMMAD IMRAN AZAMﻟﻘﺩ ﺘﻤﺕ ﺩﺭﺍﺴﺔ ﺘﺎﺜﻴﺭﺘﻐﻴﺭ ﺍﻟﻤﺴﺎﻓﺔ ﺒﻴﻥ ﺍﻟﻨﻘﺎل ﻭ Nakagam ﺍﻟﻤﺤﻁﺔ ﺍﻟﺜﺎﺒﺘﺔ ﻋﻠﻰ ﺍﻟﻤﻘﺩﺍﺭ i-m. ﻟﻬﺫﺍ ﺍﻟﻐﺭﺽ ﺘﻡ ﺘﻁﻭﻴﺭ ﻨﻤﻭﺫﺝ ﻟﻤﺴﺎﺭ ﺍﻟﻔﻘﺩ ﻭ ﺍﻟﺫﻱ ﻴﺠﺩ ﺍﻟﻘﻭﺓ ﺍﻟﻤﺒﺎﺸﺭﺓ ﻭ ﺍﻟﻤﺘﺸﺘﺘﺔ ﻋﻨﺩ ﺍﻟﻤﺤﻁﺔ ﺍﻟﺜﺎﺒﺘﺔ . ﻭ ﺘﻡ ﺘﻘﺩﻴﻡ ﺘﺎﺜﻴﺭ Nakagam ﻫﺫﺍ ﺍﻻﺨﻴﺭ ﻋﻠﻰ i-m . Γ ﻟﻤﺨﺘﻠﻑ ﺘﻭﺯﻴﻌﺎﺕ ﻤﻌﺎﻤل ﺍﻻﻨﻌﻜﺎﺱ ﻟﻘﺩ ﻭﺠﺩ m ﺒﺎﻥ ﺍﻟﺘﻭﺯﻴﻊ ﺍﻻﺴﻲ ﻴﻌﻁﻲ ﻗﻴﻡ ﺍﻜﺒﺭ ل . Gaussian ﺒﺎﻟﻤﻘﺎﺭﻨﺔ ﻤﻊ ﺍﻟﺘﻭﺯﻴﻊ ﺍﻟﺨﻁﻲ ﻭ ﺍﻟﻨﺼﻑ ﺍﻟﺘﻐﻴﺭ ﻓﻲ ﺘﺭﺩﺩ ﺍﻟﻤﻭﺠﺔ ﺍﻟﻌﺎﻤﻠﺔ ﻴﺅﺜﺭ ﺍﻴﻀﺎ ﻋﻠﻰ ﻭﺼﻠﺔ ﺍﻻﺘﺼﺎﻻﺕ ﺍﻟﺭﻗﻤﻴﺔ . ﻟﻘﺩ ﺘﻡ ﺍﺴﺘﺤﺩﺍﺙ ﻤﻘﺩﺍﺭ ∆ ﺠﺩﻴﺩ m ﻻﺠل ﺩﺭﺍﺴﺔ ﺍﻟﻤﺴﺎﻓﺔ ﺘﻐﻴﺭ ﺍﺩﺍﺀ ﺍﻟﻨﻅﺎﻡ ﻤﻊ ﺍﺯﺩﻴﺎﺩ . ﻟﻘﺩ ﺘﻡ ﺍﻴﻀﺎ ﻤﻼﺤﻅﺔ ﺍﻥ ﺍﺭﺘﻔﺎﻉ ﻫﻭﺍﺌﻲ Nakagam ﺍﻟﻤﺭﺴل ﻭ ﺍﻟﻤﺴﺘﻘﺒل ﻴﺅﺜﺭ ﻋﻠﻰ ﺎﻡ i-m ﻭ ﺃﻱ ﺍﺭﺘﻔﺎﻉ ﻓﻲ ﻗﻴﻤﺘﻪ ﺍﻟﻔﻌﻠﻴﺔ ﺘﺤﺴﻥ ﻤﻥ ﺍﺩﺍﺀ ﺍﻟﻨﻅ . Nak ﻟﻘﺩ ﺘﻤﺕ ﺩﺭﺍﺴﺔ ﺘﺩﻫﻭﺭ ﺍﻻﺩﺍﺀ ﻋﻨﺩ ﻤﺴﺎﻓﺎﺕ ﺍﻜﺒﺭ ﻭ ﻗﻴﻡ ﺍﺼﻐﺭ ﻟﻘﻴﻡ ﺍﻟﻤﻘﺩﺍﺭ agami-m ﻭ ﻟﻘﺩ ﺘﻡ EGC ﺘﺤﺴﻴﻥ ﻨﺴﺏ ﺍﻟﺨﻁﺎ ﺒﺎﺴﺘﻌﻤﺎل ﻤﻠﺘﻘﻁ Rake ﻟﻘﻨﻭﺍﺕ ﺍﻟﻔﻘﺩ ﺍﻟﻤﺴﻁﺢ ﻭ ﻤﻠﺘﻘﻁ ﻟﻘﻨﻭﺍﺕ ﺍﻟﻔﻘﺩ ﺍﻟﺘﺭﺩﺩﻱ ﺍﻻﻨﺘﻘﺎﺌﻲ .ﺍﻴﻀ ﻟﻘﺩ ﺘﻡ ﺎ ﺩﺭﺍﺴﺔ ﺘﺎﺜﻴﺭ ﻤﻘﺎﺩﻴﺭ ﻤﺨﺘﻠﻔﺔ ﻜﺎﺭﺘﻔﺎﻉ ﻫﻭﺍﺌﻴﺎﺕ ﺍﻟﻤﺭﺴل ﻭ ﺍﻟﻤﺴﺘﻘﺒل , ﻤﺤﻴﻁ ﺍﻻﻨﺘﺸﺎﺭ ,ﺍﻟﻌﺎﻤﻠﺔ ﺘﺭﺩﺩ ﺍﻟﻤﻭﺠﺔ , ﺘﻭﺯﻴﻌﺎﺕ ﻤﻌﺎﻤل ﺍﻻﻨﻌﻜﺎﺱ ﻭ ﺍﻟﻤﺴﺎﻓﺔ ﺒﻴﻥ ﺍﻟﻤﻠﺘﻘﻁ ﻭ ﺍﻟﻤﺸﺘﺘﺎﺕ ﻋﻠﻰ ﺍﻟﻨﻤﻭﺫﺝ ﺍﻟﻤﻘﺘﺭﺡ . ﻤﻔﺭﺩﺍﺕ :ﺍﻟﻔﻘﺩﻴﺔ ﺍﻟﻘﻨﻭﺍﺕ ,ﺍﺕ ﺍﻟﻔﻘﺩ ﺍﻟﻤﺘﻌﺩﺩ ﺍﻟﻤﺴ ﺎﺭ,ﺘﻭﺯﻴﻊ Nakagami ,ﻤﺴﺎﺭ ﺍﻟﻔﻘﺩ , ﺍﻻﻨﺘﺸﺎﺭ ,ﻤﻠﺘﻘﻁ RAKE, ﺍﻟﺘﻨ ﻭﻉ ,ﺍﻟﻤﺴﺎﻓﺔ0 0