Par Reduction with Minimal or Zero Bandwidth Loss and Low Complexity (98-173)

This contribution investigates no-rate-loss PAR reduction methods in terms of complexity and performance. In particular, a new method that achieves greater PAR reduction for less complexity than all other no-rate-loss PAR reduction schemes. Even with less complexity than the others (including Motorola's recent ITU/UAWG proposal in 1]), this new method has complexity feasible only for upstream ADSL, where more than 5-6 dB of PAR reduction is achieved. We maintain that our previous methods are best for downstream PAR reductions of 6-8 dB. The new methods do (as do all no-rate-loss methods, including 1]) require some level of understood speciication for interoperability unlike our previous methods that simply don't use some subset of selected tones that are not otherwise used for data transmission. NOTICE This contribution has been prepared to assist Standards Committee T1-Telecommunications. This document is ooered to the Committee as a basis for discussion and is not a binding proposal on Stanford University. The requirements are subject to change after further study. The authors speciically reserve the right to add to, amend, or withdraw, the statements contained herein J. Tellado, J. Cioo{PAR reduction with zero loss and low complexity. T1E1.4/98-173 2