Abstract: Code Division Multiple Access (CDMA) technology was chosen for the air interface of the upcoming third generation wireless systems (3G). Different CDMA systems are introduced and classified. Multi-Code CDMA (MC-CDMA) systems play a major role in this work. Code Division Multiple Access technology emerged as an alternative to the GSM cellular architecture and has shared in the past decade’s explosive growth in the wireless market. CDMA, like GSM, has seen incremental improvements in capacity throughout this period. Now both types of networks are making a transition to third-generation (3G) systems around the globe, offering yet more capacity and data services. This paper will briefly describe the origins of CDMA technology and the emergence of 3G implementations. At the beginning of 2004, the standards for third generation (3G) cellular technology were embodied in 483 Technical Specifications published by the two Partnership Projects: 3GPP and 3GPP2. Corporate members of the Partnership Projects are encouraged to identify intellectual property that is essential to implementing the standards. The 7, 796 patents are clustered in 887 families, where each family covers one invention. A preliminary evaluation of one patent from each family suggests that approximately 21% of the declared patents are actually essential. report_cdma

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