Multiuser allocation method for maximizing transmission capacity
AssigneeAT&T Intellectual Property I, L.P.
InventorRanjan V. Sonalkar
Life of this patent
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Abstract
Disclosed is a method and computer-readable medium for bit and power allocation for modems sharing a common multi-carrier binder, including Discrete Multi-Tone (DMT) based Digital Subscriber Line (DSL) modems. In one preferred embodiment, the method includes the steps of initializing a modem by calculating loop-to-loop channel transfer functions and noise power spectral densities (PSDs) at a corresponding receiver, and taking into account cross-talk between loops in the process of allocation so as to maximize total data rates within the binder.
Claims9
A method suitable for use in allocating information bits and power among user modems and frequency bins in a multi-carrier binder, said method comprising:
- calculating a set of incremental power values for increases in bit count for a set of all frequency bins in a multi-carrier binder;
- determining a least incremental power value in the set of incremental power values;
- identifying as a least-incremental-power-bit frequency bin a frequency bin having the least incremental power value, the least-incremental-power-bit frequency bin having a corresponding bit count, the least-incremental-power-bit frequency bin corresponding to a selected user;
- increasing the bit count in the least-incremental-power-bit frequency bin in response to identifying, wherein the increasing the bit count includes setting a flag indicating a full frequency bin when the increased bit count exceeds a pre-established maximum bit-count value;
- calculating power values for other non-selected users within the multi-carrier binder in response to increasing the bit count;
- and
- repeating the increasing, including the setting a flag, and calculating power values for other non-selected users until a predefined criterion has been satisfied.
Dependencies are inferred from the claim text.