Last week we examined the multiple access problem and its solutions. This week, as part of our study of wireless and mobility, we are considering another solution to the same problem, namely Code Division Multiple Access (CDMA). What is CDMA, and how does it compare to other solutions? What are its strengths and weaknesses? Write a short paper answering these questions.
Code division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code). CDMA is used as the access method in many mobile phone standards. IS-95, also called “cdmaOne”, and its 3G evolution CDMA2000, are often simply referred to as “CDMA”‘, but UMTS, the 3G standard used by GSM carriers, also uses “wideband CDMA”, or W-CDMA, as well as TD-CDMA and TD-SCDMA, as its radio technologies.
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