The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Efficient Discrete Bit Allocation Algorithm for Multi-user Channels

다수 사용자 채널을 위한 효율적인 이산 비트 할당 방법

  • 최민호 (전북대학교 대학원 전자공학과) ;
  • 송상섭 (전북대학교 공과대학 전자정보 공학부)
  • Published : 2004.09.01
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Abstract

In this paper we propose a discrete bit-loading algorithm that maximizes the transmit bit rate using the channel information. to optimize the performance of the very high-speed digital subscriber line(VDSL) system under the constraint of a maximum transmit power for each user. When the power level of crosstalk is high, the power allocation of a user changes the crosstalk experienced by the other users in the same binder. In this case, the performance of DSL modems can be improved by jointly considering the bit and power allocation of all users Simulation results shows that the proposed method improves the performance compared With that of iterative water-filling method.

본 논문에서는 VDSL 시스템의 성능을 향상하기 위하여 , 각 사용자의 송신 전력이 제한된 경우, 채널 정보를 이용해 1 천송 비트율을 최대화 하는 이산 비트 할당법을 제안하였다. 누화잡음 전력이 클 경우 어느 사용자의 전력할당은 같은 케이블을 사용하는 다른 사용자에 마치는 누화전력을 변화시킨다. 이 경우 모든 사용자의 전력할당을 같이 고려하여야 성능을 향상 시킬 수 있다. 제안한 방법의 성능을 iterative water-filling 의 성능과 비교하여 더 향상된 결과를 얻었다.

Keywords

References

  1. R. G. Gallager, Information theory and reliable communications. New York, Wiley, 1968
  2. T. M. Cover and J. A. Thomas, Elements of information theory, Wiley, 1991
  3. R. S. Cheng and S. Verdu, 'Gaussian multiaccess channels with lSI: Capacity region and multiuser water-filing,' IEEE Trans. Inform. Theory, vol. 39, no. 3, pp. 773-785, May 1993 https://doi.org/10.1109/18.256487
  4. C. Y. Wong, R. S. Cheng, K. B. Letaief, and R. D. Murch, 'Multiuser OFDM with adaptive subcarrier,' bit, and power allocation, IEEE JSAC, vol. 17, no. 10, pp. 1747-1758, Oct. 1999
  5. S.N Diggavi, 'Multiuser DMT: A multiple access modualtion scheme,' in Globecomm 1996
  6. G. Munz, S. Pfletschinger, J. Speidel, 'An efficient waterfilling algorithm for multiple access OFDM,' Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE, vol. 1, 17-21, pp. 681 685, Nov. 2002 https://doi.org/10.1109/GLOCOM.2002.1188165
  7. Wei Yu, Wonjong Rhee, Stephen Boyd, John Cioffi, 'Iterative Water-filling for Vector Multiple Access Channels,' IEEE International Symposium on Information Theory, (lSIT), 2001
  8. Wei Yu, G. Ginis, J. M. Cioffi, 'Distributed multiuser power control for digital subscriber lines,' Selected Areas in Communications, IEEE Journal, vol. 20, Issue: 5, pp. 1105 1115, Jun. 2002 https://doi.org/10.1109/JSAC.2002.1007390
  9. Roger A. Horn, Charles R. Johnson, Matrix Analysis, Cambridge University Press, 1999
  10. J. M. Cioffi, 'A multicarrier primer,' ANSI TlE1.4 Committee Contribution, Nov. 1991
  11. T. Starr, J. M. Cioffi, and P. J. Silverman, UruJerstanding Digital Subscriber Line Technology, Upper Saddle River, NJ: Prentice Hall, 1999
  12. ANSI Std. T1.417-2001, 'Spectrum Management for Loop Transmission Systems,' Jan. 2001
  13. G. D. Forney Jr. and M. V. Eyuboglu, 'Combined Equalization and Coding Usin~ Precoding," IEEE Communications Magazine, 29, Dec. 1991