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Abstract
AS DEMAND FOR WIRELESS SERVICES INCREASEA, MORE CAPACITY IS NEEDED, AND SINCE THE SPECTRUM IS AVERY SCAECE RESOURCE IS MANDATORY THE MAIN OBJECTIVE OF THIS THESIS IS TO IMPOROVE THE PERFORMANCE AND THE CAAPACITY OF DOWNLINKO(THE LINK FORM THE BASE STSTION TO THE MOBILE STATION) OF SIGNLE CARRIER AND MULTI CARRIER SYSTEMS BY APPLYING AMULTIPLE ANTENNA TECHNIQUES.
FIRST, THE THESIS INTRODUCES TWO TECHNIQUES TWO TECHNIQUES TO IMPROVE THE PERFORMANCE OF THE EXISTING CODE DIVISION MULTIPLE ACCESS (CDMA) SYSTEM NETWORKS. THESE TECHNIQUES ARE THE ANTENNA ARREY SYSTEM AND THE CHANNEL EQUALIZATION. AT THE FIRST STAGE, THE ANTENNA ARRAY IS USED TO CANCEL THE MULTIPLE ACCESS INTERENCE (MAL). THEN, THE EQUALIZATION TECHIQUES ARE USED TO MITIGATE THE EFFECT OF THE FREQUENCY SELECTIVE CHANNEL AND TO PROVIDE BETTER DESIRED DATA.