DSL system loading and ordering

Abstract

Loading and ordering techniques are provided for one-sided and two-sided vectored line groups, as well as loading methodologies that also can be used on a single line, in communication systems such as DSL binders. For single-user lines, bits and energy are optimally allocated for a given set of parameters, which may include maximum rate, minimum rate, maximum margin, target margin, minimum margin and PSD mask of any shape. Iterations, bit-swapping during loading or adaptive margin update during loading can be used in single-user loading, which has low complexity and can be used for a variety of loading objectives and / or goals, such as rate-adaptive, margin-adaptive and fixed-margin objectives. For multi-user vectoring systems, ordering as well as loading is provided for a supplied rate-tuple within a rate region, determining acceptable user loadings and orderings so that the rate-tuple can be implemented. For one-sided vectored DSL, some loading and ordering determines acceptable allocations of bits, energy and decoding / precoding ordering(s) for each tone of each user for a specified set of rates on the vectored lines. PSD determination, ordering and bit allocation can be iteratively used in multi-user loading and ordering and can augment and alter the criteria used for bit swapping procedures used in single lines (or in bonded multiple lines for a single user) so that a favorable vector of rates is achieved for all users. Order swapping can adjust a bit vector and / or rate vector within a constant-rate-sum convex subset of a hyperplane towards the desired vector of user rates for each of the lines.

Description

[0001] Cross References to Related Applications [0002] Pursuant to Title 35, United States Code, Section 119(e), this application claims the following priority interest: [0003] U.S. Provisional Application No. 60 / 686,348 (Attorney No. 0101-p19p), entitled "DSL SYSTEM LOADING ANDORDERING," filed June 10, 2005, published The contents of are hereby incorporated by reference for all purposes. [0004] U.S. Provisional Application No. 60 / 698,113 (Attorney No. 0101-p28p), entitled "DSL SYSTEM," filed July 10, 2005, the disclosure of which is by all Purposes incorporated herein by reference. technical field [0005] The present invention generally relates to methods, systems and apparatus for managing digital communication systems. Background technique [0006] Digital Subscriber Line (DSL) technology provides potentially large bandwidth for digital communications over existing telephone subscriber lines (called loops and / or copper cables). In particular, DSL systems can tu...

AI Technical Summary

Problems solved by technology

Existing methods for power spectral density determination and bit allocation fail to produce an efficient solution that satisfies all of the above constraints

Efficient solutions for bit allocation, power spectral density determination, and line sequencing have not been proposed before

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