Propotional Revision of WCDMA and LTE

  IJCOT-book-cover
 
International Journal of Computer & Organization Trends  (IJCOT)          
 
© 2016 by IJCOT Journal
Volume - 6 Issue - 3
Year of Publication : 2016
Authors : Pooja Yadav, Mamta Yadav
  10.14445/22492593/IJCOT-V34P307

MLA

Pooja Yadav, Mamta Yadav "Propotional Revision of WCDMA and LTE", International Journal of Computer & organization Trends (IJCOT), V6(3):24-27 May - Jun 2016, ISSN:2249-2593, www.ijcotjournal.org. Published by Seventh Sense Research Group.

Abstract Mobile communication is one of the warmest areas and it is emerging tremendously fast in present times, thanks to the advances of technology in all the fields of mobile and wireless communications. Nowadays the use of 3G mobile communication systems appear to be the standard, while 4G stands for the next generation of wireless and mobile communications. This comparative study between 3G & 4G tells about the background and the vision for the 4G. We first present a evaluation on the development history, characteristics, status of mobile communication and related 3G - 4G perspectives. An overall 4G framework features, having the basic keys (diversity and adaptability) of the three targets (terminals, networks, and applications). We present it in both external and internal diversity of each target to illustrate the causes and solutions of the adaptability feature. Then, the 4G domain of each feature in the framework is discussed from technical point, showing techniques and possible research issues for sufficient support of adaptability. At the end, a summary on 4G visions and some of the issues this new technology may face. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS- 95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM.

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Keywords-
OFDM, HSPA, LTE, MIMO, MCCDMA, WCDMA, UMB.