SEMINAR ON CDMA : Code Division Multiple Access (CDMA) is a form of multiplexing and a method to obtain different versions of the document, such as radio, where several people use the means at the same time I thank you for the use of different code sequences. Instead, time division multiple access to share access to a time when the access frequency division other than to share his frequency. CDMA is a kind of "spread-spectrum" signaling, since the modulated signal has codified a higher bandwidth data services.
Similarly, multiple access to the room (channel), where people want to communicate with each other. To avoid confusion, people could either speaking (time division), speak of different fields (frequency division), or speak in different directions (spatial division). CDMA, speak different languages. People who speak the same language can understand each other, but not of other peopleAlso on the radio CDMA, each user group have a common code. Many codes occupy the same channel, but only users associated with a particular code can understand each other.
CDMA also refers to digital mobile phone services that use this multiple access system, as pioneered by Qualcomm, and W-CDMA International Telecommunication Union (ITU). CDMA is used in many communications and navigation systems, such as the Global Positioning System and satellite system OmniTRACS transport logistics.

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