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Path Loss Prediction in WCDMA Systems using OVSF Codes

Published on October 2013 by P. Kavipriya, C. Gomathy
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National Conference on Recent Trends in Computer Applications
Foundation of Computer Science USA
NCRTCA - Number 1
October 2013
Authors: P. Kavipriya, C. Gomathy
817f4d48-2d37-4af8-a811-9856c4544515

P. Kavipriya, C. Gomathy . Path Loss Prediction in WCDMA Systems using OVSF Codes. National Conference on Recent Trends in Computer Applications. NCRTCA, 1 (October 2013), 37-42.

@article{
author = { P. Kavipriya, C. Gomathy },
title = { Path Loss Prediction in WCDMA Systems using OVSF Codes },
journal = { National Conference on Recent Trends in Computer Applications },
issue_date = { October 2013 },
volume = { NCRTCA },
number = { 1 },
month = { October },
year = { 2013 },
issn = 0975-8887,
pages = { 37-42 },
numpages = 6,
url = { /proceedings/ncrtca/number1/13639-1312/ },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Proceeding Article
%1 National Conference on Recent Trends in Computer Applications
%A P. Kavipriya
%A C. Gomathy
%T Path Loss Prediction in WCDMA Systems using OVSF Codes
%J National Conference on Recent Trends in Computer Applications
%@ 0975-8887
%V NCRTCA
%N 1
%P 37-42
%D 2013
%I International Journal of Computer Applications
Abstract

Orthogonal Variable Spreading Factor (OVSF) channelization codes limit the performance of third generation(3G) mobile communication systems employing Wideband Code Division Multiple Access(WCDMA). Internal fragmentation occurs when allocated data rate is larger than what is requested while external fragmentation occurs when the OVSF code tree is too fragmented to support a call even if there are sufficient capacity remaining in the code tree. We propose single-code time-shared strategies that consider channel conditions while solving these fragmentation problems. Simulation results are discussed to show the benefits of the proposed scheme. Simulation results verify that our strategies do use the precious wireless bandwidth efficiently.

References
  1. Mustafa Karakoc and Adnan Kavak 2009. Genetic approach for dynamic OVSF code allocation in 3G wireless networks", Applied Soft Computing, Vol. 9, pp. 348–361, 2009.
  2. Goldsmith. A, Wireless Communication, New York: CambridgeUniversity press, 2005, pp. 403-450.
  3. 3rd Generation Partnership Project Technical Specification GroupRadio Access Network, Spreading and modulation (FDD), 3GPP T. S. 25. 213, V8. 0. 0-2008.
  4. Mala Umar Mustapha Bakura, Jing XiaoJun, Sun Songlin, "An Improved OVSF Code Assignment Scheme at the Forward Link of WCDMA 3G System", International Journal of Machine Learning and Computing, Vol. 2, No. 2,pp: 150-155, April 2012.
  5. Askari, M. , R. Saadat, and M. Nakhkash, 2008. Assignment of OVSF Codes in Wideband CDMA, In Proc. CSICC2008, pp: 723-727, DOI: 10. 1007/978-3-540-89985-3_89.
  6. Davinder S Saini , Vipin Balyan, "OVSF code slots sharing and reduction in call blocking for 3G and beyond WCDMA networks", WSEAS TRANSACTIONS on COMMUNICATIONS,Vol. 11, No. 4, pp. 135-146, April 2012.
  7. Y. C. Tseng, C. M. Chao and S. L. Wu, Code placement and replacement strategies for wideband CDMA OVSF code tree management, in Proceedings of IEEE GLOBECOM, Vol. 1, 2001, pp. 562-566.
  8. J. S. Park and D. C. Lee, Enhanced fixed and dynamic code assignment policies for OVSFCDMA systems, in Proceedings of IEEE ICWN, 2003, pp. 620-625.
  9. T. Minn and K. Y. Siu, Dynamic Assignment of orthogonal variable spreading factor codes in W-CDMA, IEEE Journal of Selected Areas in Communication, Vol. 18, No. 8, 1998, pp. 1429-1440.
  10. Mala Umar Mustapha Bakura, Jing XiaoJun, Sun SongLin2, Huang Hai, "An Improved Region Division Allocation (IRDA) of Orthogonal Variable Spreading Factor Code in the Forward Link of WCDMA Network" Journal of Advances in Mathematical and Computational Methods, Vol. 2, No. 4, pp. 67-73 , December, 2012.
  11. en. wikipedia. org/wiki/Path_loss?
Index Terms

Computer Science
Information Sciences

Keywords

Wcdma Ovsf Code code Assignment Code Blocking Path Loss .