ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
권호 표지

Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems

  • Lee, Ze-Shin (Department of Communication Engineering, National Central University) ;
  • Tsay, Mu-King (Department of Communication Engineering, National Central University) ;
  • Liao, Chien-Hsing (Department of Communication Engineering, National Central University)
  • Received : 2008.05.21
  • Accepted : 2009.02.10
  • Published : 2009.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

Rain attenuation and intercell interference are two crucial factors in the performance of broadband wireless access networks such as local multipoint distribution systems (LMDS) operating at frequencies above 20 GHz. Power control can enhance the performance of downlink CDMA-based LMDS systems by reducing intercell interference under clear sky conditions; however, it may damage system performance under rainy conditions. To ensure robust operation under both clear sky and rainy conditions, we propose a novel power-control scheme which applies an adaptive neuro-fuzzy inference system (ANFIS) for downlink CDMA-based LMDS systems. In the proposed system, the rain rate and the number of users are two inputs of the fuzzy inference system, and output is defined as channel quality, which is applied in the power control scheme to adjust the power control region. Moreover, ITU-R P.530 is employed to estimate the rain attenuation. The influence of the rain rate and the number of users on the distance-based power control (DBPC) scheme is included in the simulation model as the training database. Simulation results indicate that the proposed scheme improves the throughput of the DBPC scheme.

Keywords

References

  1. H. Sari, “Broadband Radio Access to Homes and Businesses: MMDS and LMDS,” Comput. Netw., vol. 31, 1999, pp. 379-393. https://doi.org/10.1016/S0169-7552(98)00270-0
  2. D.A. Gray, “A Broadband Wireless Access System at 28 GHz,” Proc. NIST–Cosponsored Conf. on Wirel. Commun., Boulder, CO, 11-13 Aug. 1997, pp. 1-7.
  3. S.Q. Gong and D. Falconer, “Cochannel Interference in Cellular Fixed Broadband Access Systems with Directional Antennas,”Wirel. Pers. Commun., vol. 10, no. 1, June 1999, pp. 103-117. https://doi.org/10.1023/A:1018324924194
  4. C. Novák, A. Tikk, and J. Bitó, “Code Sectoring Methods in CDMA-Based Broadband Point-to-Multipoint Networks,” IEEE Microwave and Wireless Components Letters, vol. 13, 2003, pp. 320-322. https://doi.org/10.1109/LMWC.2003.815703
  5. P.D.M. Arapoglou et al., “Intercell Radio Interference Studies in CDMA-Based LMDS Networks,” IEEE Trans. Anten. & Propag., vol. 53, no. 8, Aug. 2005, pp. 2471-2479. https://doi.org/10.1109/TAP.2005.852509
  6. A.D. Panagopoulos et al., “Intercell Radio Interference Studies in Broadband Wireless Access Networks,” IEEE Trans. Veh. Technol., vol. 56, no. 1, Jan. 2007, pp. 3-12. https://doi.org/10.1109/TVT.2006.883774
  7. M.K. Tsay and F.T. Wang, “Cellular Architecture on CDMABased LMDS,” Proc. Third Int. Symp. CSNDSP, Staffordshire, U.K., July 2002.
  8. C.-Y. Chu and K.S. Chen, “Effects of Rain Fading on the Efficiency of the Ka-Band LMDS System in the Taiwan Area,” IEEE Trans. Veh. Technol., vol. 54, no. 1, Jan. 2005, pp. 9-19. https://doi.org/10.1109/TVT.2004.839627
  9. H. Halbauer, P. Jaenecke, and H. Sari, “An Analysis of Code-Division Multiple Access for LMDS Networks,” Proc. 7th European Conf. Fixed Radio Systems and Networks, Dresden, Sept. 2003, pp. 173-180.
  10. H. Sari, “A Multimode CDMA with Reduced Intercell Interference for Broadband Wireless Networks,” IEEE J. Select. Areas Commun., vol. 19, no. 7, July 2001, pp. 1316-1323. https://doi.org/10.1109/49.932699
  11. C. Sinka and J. Bitó, “Site Diversity against Rain Fading in LMDS systems,” IEEE Microw. Wireless Compon. Lett., vol. 13, no. 8, Aug. 2003, pp. 317-319. https://doi.org/10.1109/LMWC.2003.815702
  12. A.D. Panagopoulos, V.K. Katsambas, and J.D. Kanellopoulos, “A Simple Model for Differential Rain Attenuation Statistics on Converging Terrestrial Microwave Paths,” IEEE Antennas Wireless Propag. Lett., vol. 2, 2003, pp. 82-85. https://doi.org/10.1109/LAWP.2003.814772
  13. Y.M. Siu and K.K. Soo, “CDMA Mobile Systems with Tailor Made Power Control to Each Mobile Station,” Proc. in IEE 1st. Int. Conf. on 3G Mobile Commun. Tech., no. 471, Mar. 2000, pp. 46-50.
  14. W.C.Y. Lee, “Overview of Cellular CDMA,” IEEE Trans. Veh. Technol., vol. 40, no. 2, May 1991, pp. 291-302. https://doi.org/10.1109/25.289410
  15. R.R. Gejji, “Forward-Link-Power Control in CDMA Cellular Systems,” IEEE Trans. Veh. Technol., vol. 41, no. 4, Nov. 1992, pp. 532-536. https://doi.org/10.1109/25.182606
  16. L. Nuaymi, P. Godlewski, and X. Lagrange, “Power Allocation and Control for the Downlink in Cellular CDMA Networks,” Proc. 12th IEEE Int. Symp. PIMRC, vol. 1, San Diego, 2001, pp. c-29–c-31.
  17. P.R. Chang and B.C. Wang, “Adaptive Fuzzy Power Control for CDMA Mobile Radio Systems,” IEEE Trans. Veh. Technol., vol. 45, no. 2, May 1996, pp. 225-236. https://doi.org/10.1109/25.492846
  18. X. Wu, L. Ge, and G. Liang, “Adaptive Power Control on the Reverse Link for CDMA Cellular System,” Proc. IEEE 15th APCC / OECC '99 Commun., vol. 1, Oct. 1999, pp. 608-611.
  19. M.K. Tsay, Z.S. Lee, and C.H. Liao, “Fuzzy Power Control for Downlink CDMA-Based LMDS Network,” IEEE Trans. Veh. Technol., vol. 57, no. 6, Nov. 2008, pp. 3917-3921. https://doi.org/10.1109/TVT.2008.921618
  20. J.S.R. Jang, “ANFIS: Adaptive-Network-Based Fuzzy Inference Systems,” IEEE Trans. Syst. Man and Cybern., vol. 23, no. 3, 1993, pp. 665-685. https://doi.org/10.1109/21.256541
  21. E.H. Dinan and B. Jabbari, “Spreading Codes for Direct Sequence CDMA and Wideband CDMA Cellular Networks,” IEEE Commun. Mag., vol. 36, Sept. 1998, pp. 48-54.
  22. ITU-R, Propagation Data and Prediction Methods Required for the Design of Terrestrial Line-of-Sight Systems, ITU-R Rec. P530–10, 2001.
  23. ITU-R, Specific Attenuation Model for Rain for Use in Prediction Methods, ITU-R Rec. P838-2, 2003.
  24. C.H. Lee, B.Y. Chung, and S.H. Lee, “Dynamic Modulation Scheme in Consideration of Cell Interference for LMDS,” Proc. Int. Conf. Commun. Tech., vol. 2, Beijing, China, Oct. 1998, pp. S38-8-1-S38-8-5.