Adjusting a power allocation of users in a digital subscriber line environment

摘要

A method and a device adjust a power allocation of users in a digital subscriber line environment. An intermediate power allocation is determined for at least one user initializing with the digital subscriber line environment based on a new power allocation determined for the digital subscriber line environment containing the at least one user. The intermediate power allocation provides a predefined minimum signal-to-noise ratio margin for the active users of the digital subscriber line environment. Furthermore, a communication system can contain such a device.

主权项

1. A method for adjusting a power allocation of users in a digital subscriber line environment, which comprises the steps of:
determining an intermediate power allocation for at least one user initializing with the digital subscriber line environment based on a new power allocation determined for the digital subscriber line environment containing the at least one user, the intermediate power allocation providing a predefined minimum signal-to-noise ratio margin for active users of the digital subscriber line environment; and determining the intermediate power allocation such that a distance metric between an actual power allocation and the new power allocation is reduced: wherein the distance metric comprises a distance function selected from the group consisting of:Δ⁡(s⁡(i),snew)=∑n⁢∑k⁢(skn⁡(i)sk,newn-1)2;Δ⁡(s⁡(i),snew)=∑n⁢∑k⁢αkn⁡(skn⁡(i)-sk,newn)2;andΔ⁡(s⁡(i),snew)=∑n⁢∑k⁢αkn⁡(skn⁡(i)sk,newn-sk,newaskn⁡(i))2;wherein
skn denotes a power spectrum density of a transmit signal of a user n; k denotes a subchannel or tone; snew is the new power allocation; and s(i) is the intermediate power allocation at a step i.