Share This Article:

An Improved Power Estimation for Mobile Satellite Communication Systems

Abstract Full-Text HTML XML Download Download as PDF (Size:1077KB) PP. 179-184
DOI: 10.4236/ijcns.2009.23020    4,256 Downloads   8,277 Views   Citations

ABSTRACT

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

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

B. KIM, N. LEE and S. RYOO, "An Improved Power Estimation for Mobile Satellite Communication Systems," International Journal of Communications, Network and System Sciences, Vol. 2 No. 3, 2009, pp. 179-184. doi: 10.4236/ijcns.2009.23020.

References

[1] I. Philipopoulos, S. Panagiotarakis, and A. Yanelli-coralli, “The role of S-UMTS in future 3G markets,” ist- 2000-25030 SATIN project, SUMTS, P-specific requirement, deliverable No. 2, April 2002.
[2] G. M. Parson and R. Singh, “An ATC primer: The future of communications,” MSV, 2006.
[3] Report and order and notice of proposed rulemaking, fcc 03-15, Flexibility for Delivery of Communications by Mobile Satellite Service Providers in the 2 ghz band, the L-Band, and the 1.6/2.4 Bands, IB, Adopted: January 29, 2003, Released: February 10, 2003.
[4] S. Dutta and D. Karabinis, “Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially re- used satellite frequencies at a radioterminal to reduce po-tential interference,” US Patent No. 6879829 b2, April 12, 2005.
[5] T. Luo and Y. C. Ko, “Pilot diversity channel estimation in power-controlled CDMA systems,” IEEE Transactions on Vehicular Technology, Vol. 53, No. 2, pp. 559-563, March 2004.
[6] S. M. Kay, “Fundamentals of statistical signal processing: Estimation theory,” 2nd Edition, Englewood Cliffs, NJ: Prentice-Hall, 1993.
[7] H. V. Khuong and H. Y. Kong, “BER performance of cooperative transmission for the uplink of TDD-CDMA systems,” ETRI Journal, Vol. 28, No. 1, pp. 17-30, Feb-ruary 2006.
[8] C. -C. Lee and R. Steele, “Closed-loop power control in CDMA systems,” IEE Proceedings of Communications, Vol. 143, No. 4, pp. 231-239, August 1996.
[9] W. C. Y. Lee, “Mobile communications engineering,” 2nd Edition, Mcgraw-Hill, 1998.
[10] S. Choe, “An analytical framework for imperfect DS- CDMA closed-loop power control over flat fading,” ETRI Journal, Vol. 27, No. 6, pp. 810-813, December 2005.
[11] K. Lim, K. Choi, K. Kang, S. Kim, and H. J. Lee, “A satellite radio interface for IMT-2000,” ETRI Journal, Vol. 24, No. 6, pp. 415-428, December 2002.
[12] F. Gunnarsson, F. Gustafsson, and J. Blom, “Dynamical effects of time delays and time delay compensation in power controlled DS-CDMA,” in IEEE Journal of Selected Areas on Communications, Vol. 19, No. 1, pp. 141-151, January 2001.

  
comments powered by Disqus

Copyright © 2019 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.