Dynamic spectrum management for next-generation DSL systems
IEEE Communications Magazine
Near-end crosstalk mitigation in ADSL systems
IEEE Journal on Selected Areas in Communications
Autonomous synchronization of a DMT-VDSL system in unbundled networks
IEEE Journal on Selected Areas in Communications
Vectored transmission for digital subscriber line systems
IEEE Journal on Selected Areas in Communications
Distributed multiuser power control for digital subscriber lines
IEEE Journal on Selected Areas in Communications
Duality gap estimation and polynomial time approximation for optimal spectrum management
IEEE Transactions on Signal Processing
Iterative spectrum shaping with opportunistic multiuser detection
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Spectrum management for interference-limited multiuser communication systems
IEEE Transactions on Information Theory
IEEE/ACM Transactions on Networking (TON)
Budget allocation in a competitive communication spectrum economy
EURASIP Journal on Advances in Signal Processing - Special issue on game theory in signal processing and communications
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In a digital subscriber line (DSL) system with strong crosstalk, the detection and cancellation of interference signals have the potential to improve the overall data rate performance. However, as DSL crosstalk channels are highly frequency selective and multiuser detection is suitable only when crosstalk is strong, the set of frequency tones in which multiuser detection may be used must be carefully chosen. Further, this problem of tone selection is highly coupled with the transmit power spectra of both direct and interfering signals, so the optimal solution requires the tone selection problem to be solved jointly with the multiuser spectrum optimization problem. The main idea of this paper is that the above joint optimization may be done efficiently using a dual decomposition technique similar to that of the optimal spectrum balancing algorithm. Simulations show that multiuser detection can increase the bit rate performance in a remotely deployed ADSL environment. Rate improvement is also observed when near-end crosstalk is estimated and cancelled in a VDSL environment with overlapping upstream and downstream frequency bands.