Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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An Efficient Power Control Algorithm for Satellite Communications Systems with ATC

  • Published : 2008.06.30
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Abstract

In this paper, modified power control algorithms are proposed for a satellite mobile communications system with ATC (ancillary terrestrial component). In order to increase system capacity and reduce the transmitting power of the user's equipment, we propose the modified power control scheme consisting of the modified closed-loop and open-loop power control. The modified CLPC (closed-loop power control) algorithm, combining the delay compensation algorithms and pilot diversity, is mainly applied to the ATC link in urban areas because it is more suitable to the short RTD (round-trip delay). In the case of rural areas where ATCs are not deployed or a signal is not received from ATCs, combining monitoring transmitting power equipment and OLPC (open-loop power control) algorithms using an efficient pilot diversity is mainly applied to the link between the user's equipment and the satellite. Two power control algorithms are applied equally to the boundary areas where two kinds of signals are received in order to ensure coverage continuity. The simulation results show that the modified power control scheme has good performance compared to conventional power control schemes in a GEO (geostationary earth orbit) satellite system with ATC.

Keywords

References

  1. Estimates of MSS subscriber numbers and traffic profiles for the ASMS-TF," ESYS Consulting, 2003
  2. Gary M. Parson and Dr. Rajendra Singh, "An ATC primer: the future of communications," MSV. 2006
  3. S. Dutta and D. Karabinis, "Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially reused satellite frequencies at a radioterminal to reduce potential interference," US Patent no. 6879829 B2, Apr. 12, 2005
  4. F. Gunnarsson, F. Gustafsson, and J. Blom, "Dynamical effects of time delays and time delay compensation in power controlled DS-CDMA," in IEEE J. Select. Areas Commun., vol. 19, no. 1, pp. 141-151, Jan. 2001 https://doi.org/10.1109/49.909616
  5. C. -C. LEE, and R. Steele, "Closed-loop power control in CDMA systems," IEE Proc. Comm., vol, 143, no. 4, pp. 231-239, Aug. 1996 https://doi.org/10.1049/ip-com:19960613
  6. 3GPP2 TSG-C, "Physical Layer Standard for cdma2000 spread spectrum systems - Release 0," May 2001Cheol-Hun Na et, al., "Cancer Cell Recognition by Fuzzy Logic in Medical Images", GSPx 2005, Santa Clara, CA, U.S.A., 2005
  7. 3GPP TS 25.214, "Physical layer -Procedures (FDD) - Release 5," 2004.S. M. Alamouti, "A Simple Diversity Technique for Wireless Communications," IEEE Journal on select areas in communications, Vol.16, No.8, pp.1451-1458, October 1998 https://doi.org/10.1109/49.730453