Code acquisition in DS-CDMA systems optimization and DSP implementation
No Thumbnail Available
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Saudi Digital Library
Abstract
ﻣﺰاﻣﻨﺔ اﻟﺮﻣﻮزهﻲ ﻣﺤﺎوﻟﺔ ﻣﺰاﻣﻨﺔ ﺳﺎﻋﺔ اﻟﻤﺴﺘﻘﺒﻞ و ﺳﺎﻋﺔ اﻟﻤﺮﺳﻞ , ﻋﻤﻠﻴﺔ CDMA ﻃﻠﺐ ﺗﻮﻗﻴﺖ اﺷﺎرة اﻟﻤﺮﺳﻠﺔ .CDMA ﻣﻬﻤﺔ ﻟﺘﻄﺒﻴﻖ اي ﻧﻈﺎم اﻻداء اﻟﻜﻠﻲ ﻟﻠﻨﻈﺎم ﻳﻌﺘﻤﺪ اﺳﺎﺳﺎ ﻋﻠﻰ ﻧﻈﺎم اﻟﺘﻮﻗﻴﺖ ﻟﻠﺮﻣﻮزﻻن آﻞ اﻟﻨﻈﻢ اﻻﺧﺮى
ﻣﺮﺗﺒﻄﺔ ﺑﻪ. ,CDMA ﻓﻲ ﻧﻈﺎم ﻧﺴﺒﺔ اﻻﺷﺎرة اﻟﻰ اﻟﺘﺪاﺧﻞ زاﺋﺪ اﻟﻀﺠﻴﺞ ﻋﻨﺪ اﻟﻤﺴﺘﻘﺒﻞ ﺗﻌﺘﻤﺪ ﻋﻠﻰ ﺷﻜﻞ اﻟﻨﺒﻀﺔ اﻟﻤﺴﺘﻌﻤﻠﺔ ﻟﻨﺸﺮ
اﺷﺎرات اﻟﻤﺴﺘﻌﻤﻞ . Gaussian اداء ﻧﻈﺎم اﻟﺘﻮﻗﻴﺖ ﻣﺪد ﺑﺎﺳﺘﻌﻤﺎل ﺗﻘﺮﻳﺐ اﻟﻤﺤﺴﻦ اﻟﺬي ﻳﺎﺧﺬ اآﺜﺮ ﺑﻌﻴﻦ اﻻﻋﺘﺒﺎر ﺗﺎﺛﻴﺮ .CDMA اﻟﺘﺪاﺧﻞ ﻋﻠﻰ ﻧﻈﺎم
اﻟﻌﺘﺒﺔ ﻳﺠﺐ ﺗﻜﻮن اآﺜﺮ ﻣﻦ ﺣﺪ اﻟﻀﺠﻴﺞ ,ﻟﻠﻤﻠﺘﻘﻂ ﻟﺬا ﻓﺎن ﺗﻘﺪﻳﺮ هﺬﻩ اﻟﺼﻮرة ﻻزﻣﺔ . ﺗﺤﺖ ﻇﺮوف ﻣﺴﺘﻘﺮة ﻟﻠﻘﻨﺎة ﻓﺎن
اﻟﻌﺘﺒﺔ ﻳﻤﻜﻦ ﺗﺜﺒﻴﺘﻬﺎ , ﻟﻜﻦ ﻓﻲ ﺣﺎﻟﺔ اﻟﻈﺮوف اﻟﺪﻳﻨﺎﻣﻴﻜﻴﺔ ﻟﻠﻘﻨﺎة اﻳﻦ اﻟﺘﺪاﺧﻞ ﻣﻮﺟﻮد ﻓﺎن اﺳﺘﻌﻤﺎل ﻋﺘﺒﺎت ﺗﻜﻴﻔﻴﺔ ﺗﺼﺒﺢ
ﻻزﻣﺔ .اﻟﻀﺠﻴﺞ ﻳﺠﺐ ﺗﺼﻤﻴﻢ ﻋﺘﺒﺔ ﺗﻮﻗﻴﺘﻴﺔ اﻳﻦ ﻳﺘﻢ ﺗﻐﻴﻴﺮ ﻗﻴﻤﺘﻬﺎ ﺗﺒﻌﺎ ﻟﻘﻴﻤﺔ ﻧﺴﺒﺔ اﻻﺷﺎرة اﻟﻰ اﻟﺘﺪاﺧﻞ زاﺋﺪ .
ﻓﻲ هﺬﻩ اﻟﺮﺳﺎﻟﺔ ﻧﻘﺘﺮح ﻧﻈﺎم ﻣﺤﺴﻦ ﻟﺘﺤﺪﻳﺪ ﻋﺘﺒﺔ ﻟﻨﻈﺎم اﻟﺒﺤﺚ اﻟﻬﺠﻴﻦ .ﻋﻠﻰ Texas اﻟﺨﻮارزﻣﻴﺎت ﻃﺒﻘﺖ اﻳﻀﺎ