Investigation of Upstream Near-Far Problem in VDSL Systems via Complete Adaptive Iterative Water Filling Algorithm
Mohammad Sadeghi, Vahid T. Vakili, Mansour J. Nejati
DOI: 10.4236/cn.2011.34024   PDF    HTML     4,352 Downloads   7,869 Views  


Crosstalk is the main degrading factor in Digital Subscriber Line (DSL) systems which are the result of electromagnetic coupling between two adjacent twisted pairs in a cable. Very-high bit-rate Digital Subscriber Line (VDSL) systems which use higher frequencies for data transmission than the other DSL systems, this effect is more considerable in Bit Error Rate (BER) degradation. This paper considers a complete adaptive iterative water-filling (IWF) algorithm for Resolving Upstream Near-Far Problem in VDSL Systems. The new distributed dynamic spectrum management algorithm is proposed, which improve achievable bit rate of iterative water-filling algorithm. The paper proffers a new power back-off strategy of the spectral mask at the near-end users, in order to protect the far-end users. Simulation of the proposed algorithm indicates that the bit rate is increased considerably rather the IWF and adaptive water-filling (AIWF) algorithms by keeping their low complexity. Furthermore, by adding the number of users in network, the new algorithm achieves performance gains over the AIWF, completely adaptive.

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M. Sadeghi, V. Vakili and M. Nejati, "Investigation of Upstream Near-Far Problem in VDSL Systems via Complete Adaptive Iterative Water Filling Algorithm," Communications and Network, Vol. 3 No. 4, 2011, pp. 210-219. doi: 10.4236/cn.2011.34024.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Broadband Forum, “3 Million New North-American Broadband Subscribers Added in First Quarter 2009 Despite Economic Downturn,” News Release, 2009, pp. 1-3.
[2] ANSI Standard T1.417-2001, “Spectrum Management for Loop Transmission Systems,” Prepared by the ANSI T1E1.4 Working Group on Digital Subscriber Line Access, American National Standard, 2001.
[3] T. Starr, M. Sorbara, J. M. Cioffi and P. J. Silverman, “DSL Advances,” Prentice-Hall, Upper Saddle River, 2003.
[4] J. M. Cioffi, S. Jagannathan, W. Lee, H. Zou, A. Chowdhery, W. Rhee, G. Ginis and P. Silverman, “Greener Copper with Dynamic Spectrum Management,” Proceedings of IEEE Global Communications Conference, New Orleans, December 2008, pp. 1-5. doi:10.1109/GLOCOM.2008.ECP.1092
[5] Y. Wei, G. Ginis and J. M. Cioffi, “Distributed Multiuser Power Control for Digital Subscriber Lines,” IEEE Journal on Selected Areas in Communications, Vol. 20, No. 5, 2002, pp. 1105-1115. doi:10.1109/JSAC.2002.1007390
[6] Y. Liu and Z. Su, “Distributed Dynamic Spectrum Management for Digital Subscriber Lines,” IEICE Transactions on Communications, Vol. E90B, No. 3, 2007, pp. 491-498.
[7] H. Bagheri, M. R. Pakravan and B. H. Khalaj, “Iterative Multi-User Power Allocation: Performance Evaluation & Modification,” Proceedings of IEEE Region 10 TENCON, Vol. 3, 2004, pp. 216-219.
[8] D. Statovci, T. NordstrAom and R. Nilsson, “The Normalized-Rate Iterative Algorithm: Apractical Dynamic Spectrum Management Method for DSL,” EURASIP Journal on Applied Signal Processing, Vol. 2006, 2006, Article ID: 95175. doi:10.1155/ASP/2006/95175
[9] W. Lee, Y. Kim, M. H. Brady and J. M. Cioffi, “Band- Preference Dynamic Spectrum Management in a DSL Environment,” GLOBECOM, 27 November-1 December 2006, pp. 1-5. doi:10.1109/GLOCOM.2006.585
[10] Y. Noam and A. Leshem, “Iterative Power Pricing for Distributed Spectrum Coordination in DSL,” IEEE Transactions on Communications, Vol. 57, No. 4, 2009, pp. 948- 953. doi:10.1109/TCOMM.2009.4814362
[11] D. H. N. Nguyen and T. Le-Ngoc, “Adaptive Iterative Water-Filling for Dynamic Spectrum Management in DSL Networks,” 2010 IEEE International Conference on Communications (ICC), Cape Town, 23-27 May 2010, pp. 1-5. doi:10.1109/ICC.2010.5502366
[12] T. Starr, J. M. Cioffi and P. Silverman, “Understanding Digital Subscriber Line Technology,” Prentice-Hall, Upper Saddle River, 1999.
[13] FSAN VDSL Working Group, “Power Back-off Methods for VDSL,” ETSI TM6 Contribution 983t17a0, Lulea, June 1998, pp. 1-6.
[14] K. S. Jacobsen, “Methods of Upstream Power Back off on Very High Speed Digital Subscriber Lines,” IEEE Communications Magazine, Vol. 39, No. 3, 2001, pp. 210-216. doi:10.1109/35.910609

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