CDMA (Download Full Seminar Report)

[seminar class]

PRESENTED BY:
LAKPA BITTU TAMANG
JITENDRA KUMAR RAI

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INTRODUCTION:
 CDMA is a new technology in wireless communication.
 Spread Spectrum technique is used.
 Mathematical codes are used to transmit & distinguish the users.
 The great attraction of CDMA technology has been because of the extraordinary increase in the system capacity and the service capacity.
 CDMA is extremely robust and provides excellent audio quality.
HISTORY:
 1st generation cellular system introduced in 1980, uses Analog frequency modulation.
 Due to some drawbacks, increase in market demands led to the foundation of 2nd generation cellular system.
 2nd generation cellular system uses Digital modulation technique which includes CDMA, GSM & TDMA.
 CDMA was introduced by QUALCOMM in 1994.
 CDMA provides 10 times more capacity than other Analog system.
BASIS OF CDMA:
 Based on Spread Spectrum Technology.
 Spread Spectrum is independent of data sequence.
 It provides secure communication which is not easily detectable.
 It rejects unwanted interference that may be intentional or unintentional.
 Number of independent users can share a common channel without external SYNCHRONIZING mechanism.
COMPETITION:
 The Euro-Asian biggest competitive to CDMA is the GSM.
 CDMA is more advantageous to GSM due to less interference, low radiation level & more security.
 GSM uses modified version of TDMA.
 GSM increases the network strength using SIM card.
 CDMA is the fastest growing technology in wireless communication than GSM.