Channel Estimation Method Using Power Control Schemes in Wireless Systems

  • Received : 2009.10.28
  • Published : 2010.04.30

Abstract

Green communication is a new paradigm of designing the communication system which considers not only the processing performance but also the energy efficiency. Power control management is one of the approaches in green communication to reduce the power consumption in distributed communication system. In this paper, we propose improved power control schemes for mobile satellite systems with ancillary terrestrial components (ATCs). In order to increase system capacity and reduce the transmitting power of the user's equipment, we propose an efficient channel estimation method consisting of a modified open-loop power control (OLPC) and closed-loop power control (CLPC). The OLPC works well if the forward and reverse links are perfectly correlated. The CLPC is sensitive to round-trip delay and, therefore, it is not effective in a mobile satellite system. In order to solve the above problem, we added monitoring equipment to both the OLPC and CLPC to use information about transmitting power that has not yet been received by the receiver over the satellite/ATC channel. Moreover, we adapted an efficient pilot diversity of both OLPC and CLPC in order to get a better signal to interference plus noise ratio estimation of the received signal.

Keywords

References

  1. "Estimates of MSS subscriber numbers and traffic profiles for the ASMS-TF," ESYS Consulting. 2003.
  2. L Philipopoulos, S. Panagiotarakis, and A, Yanelli-Coralli, "The role of SUMTS in future 3G markets," IST-2000-25030 SATIN Project, SUMTS.P-specific requirement, deliverable No.2, Apr. 2002.
  3. G. M. Parson and R. Singh, "An ATC primer: The future of communications," MSV. 2006.
  4. "Flexibility for delivery of communications by mobile satellite service providers in the 2 Ghz band, the L-band, and the 1.612.4 bands," IB, Report and Order and Notice of Proposed Rulemaking, FCC 03-15, Adopted: Jan. 29, 2003, Released: Feb., 10.2003.
  5. P. Conforto, C. Tocci, G. Losquadro, R. E. Sheriff, P. M. L. Chan, and Y. Fun Hu, "Ubiquitous Intemet in an integrated satellite-terrestrial environment: The SUITED solution," IEEE Commun. Mag., vol. 40, pp. 98-107, Jan. 2002.
  6. "Introduction of the multimedia broadcast multicast service (MBMS) in the radio access network (RAN)," Third Generation Partnership Project (3GPP) Technical Specification 25-346, Stage 2, Release 6, Mar, 2004.
  7. "Satellite earth stations and systems (SES); satellite component of UMTS/IMT-2000; evaluation of the W-CDMA UTRA FDD as a satellite radio interface," ETSI TR 102058, Nov. 2004.
  8. 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.
  9. A. M. Monk and A. Chockalingam, L. B. Milstein, "Open-loop power control error on a frequency selective CDMA channel," in Proc. IEEE GLOBECOM, Dec. 1994, pp. 29-33.
  10. A M, Monk and L. B. Milstein, "Open-loop power control error in a land mobile satellite system," IEEE J. Sel. Areas Commun., vol. 13, no. 2, pp. 205-212, Feb, 1995. https://doi.org/10.1109/49.345864
  11. F. Gunnarsson, F. Gustafsson, and J. Blom, "Dynamical effects of time delays and time delay compensation in power controlled DS-CDMA," IEEE J. Sel. Areas Commun., vol. 19, no. 1, pp. 141-151, Jan. 2001. https://doi.org/10.1109/49.909616
  12. F. Gunnarsson and E Gustafsson, "Time delay compensation in power controlled cellular radio systems," IEEE Commun. Lett., vol. 5, no. 7, pp. 295-297, July 2001. https://doi.org/10.1109/4234.935747
  13. P. D, Karabinis, S, Dutta, and W. W. Chapman, "Interference potential to MSS due to terrestrial reuse of satellite band frequencies," in Proc. ICSSC.
  14. K. S. Gihousen, I. M. Jacobs, R. Padovani, A. J. Viterbi, L. A. Weaver, and C. E. Wheatley, "On the capacity of a cellular CDMA system," IEEE Trans. Veh. Technol., vol. 40, no. 2, pp. 303-312, May 1991. https://doi.org/10.1109/25.289411
  15. J. S. Lehnert, "An efficient technique for evaluation direct-sequence spread-spectrum mUltiple access communications," IEEE Trans. Comm.,vol. 37, no. 8, pp. 851-858, Aug. 1989. https://doi.org/10.1109/26.31184
  16. D. Pauluzzi and N. Beaulieu, "A comparison of SNR estimation techniques for the AWGN channel," IEEE Trans. Commun., vol. 48, no. 10, pp. 1681-1691, Oct. 2000. https://doi.org/10.1109/26.871393
  17. S. Seo, T. Dohi, and F. Adachi, "SIR-based transmit power control of reverse link for coherent DS-CDMA mobile radio," IEICE Trans. Commun., vol. E81-B, no. 7, pp. 1508-1516, July 1998.
  18. H. V. Khuong and H. Y. Kong, "BER performance of cooperative transmission for the uplink of TDD-CDMA systems," ETRI J., vol. 28, no. 1, pp.17-30, Feb.2006. https://doi.org/10.4218/etrij.06.0105.0071
  19. T. Luo and Y. C. Ko, "Pilot diversity channel estimation in powercontrolled CDMA systems," IEEE Trans. Veh. Technol., vol. 53, no. 2, pp. 559-563, Mar. 2004. https://doi.org/10.1109/TVT.2004.823505
  20. M. U suda, Y. Ishikawa, and S. Onoe, "Optimizing the number fo dedicated pilot symbols for forward link in WCDMA systems," in Proc. IEEE VTC, June 2000, pp. 2118-2122.
  21. S. M. Kay, Fundamentals of Statistical Signal Processing: Esimation Theory, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, 1993.
  22. R. Zamir, "A proof of the Fisher information matrix inequality via a data processing argument," IEEE Trans. Inf. Theory, vol. 44, pp. 1246-1250, 1998. https://doi.org/10.1109/18.669301
  23. C.-C. Lee and R. Steele, "Closed-loop power control in CDMA systems," IEE Proc. Commun., vol, 143, no. 4, pp. 231-239, Aug. 1996. https://doi.org/10.1049/ip-com:19960613
  24. C. William and Y. Lee, Mobile Communications Engineering, 2nd ed., McGraw-Hili, 1998.
  25. "Physical layer standard for cdma2000 spread spectrum systems-Release 0," 3GPP2 TSG-C, May 2001.
  26. S. Choe, "An analytical framework for imperfect DS-CDMA closed-loop power control over flat fading," ETRI J., vol. 27, no. 6, pp. 810-813, Dec. 2005. https://doi.org/10.4218/etrij.05.0205.0032
  27. T. Chulajata and H. M. Kwon, "Combinations of power controls for cdma2000 wireless communications system," in Proc. IEEE VTC, vol. 2, Sept. 2000, pp. 638-645.
  28. "Physical layer-procedures (FDD)-Release 5," 3GPP TS 25.214, 2004.
  29. "Satellite component of UMTSIIMT2000: A-family: Part 4, physical layer procedures (S-UMTS-A 25.214)," ETSI TS 101 851-4, Nov. 2000.
  30. "Detailed specifications of radio interfaces of IMT-2000," Recommendation ITU-R M.1457, 2001.
  31. K. Lim, K. Choi, K. Kang, S. Kim, and H. J. Lee, "A satellite radio interface for IMT-2000," ETRI J., vol, 24, no. 6, pp. 415-428, Dec. 2002. https://doi.org/10.4218/etrij.02.0102.0002