OFDMA WITH ADAPTIVE SUBCARRIER-CLUSTER CONFIGURATION AND SELECTIVE LOADING

摘要

A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.

主权项

1. A method for a wireless system employing orthogonal frequency division multiple access (OFDMA), the method comprising:
measuring, at a first time by a subscriber unit, a first channel information for a first plurality of subcarriers based on a first plurality of pilot symbols received from a base station; providing, by the subscriber unit, a first feedback information relating to a plurality of feedback clusters based on at least the measuring of the first channel information for the first plurality of subcarriers based on the first plurality of pilot symbols, each feedback cluster of the plurality of feedback clusters being a plurality of subcarriers, the first feedback information relating to the plurality of feedback clusters based on the first plurality of pilot symbols includes an index corresponding to a first modulation and coding rate associated with each feedback cluster of the plurality of feedback clusters; receiving, by the subscriber unit, a first allocation of OFDMA subcarriers selected by the base station for use by the subscriber unit, the first allocation of OFDMA subcarriers including an indication of a modulation and coding rate associated with the first allocation of OFDMA subcarriers; measuring, at a second time by the subscriber unit, a second channel information for a second plurality of subcarriers based on a second plurality of pilot symbols received from the base station; providing, by the subscriber unit, a second feedback information relating to the plurality of feedback clusters based on at least the measuring of the second channel information for the second plurality of subcarriers based on the second plurality of pilot symbols, the second feedback information relating to the plurality of feedback clusters based on the second plurality of pilot symbols includes an index corresponding to a second modulation and coding rate associated with each feedback cluster of the plurality of feedback clusters; and receiving, by the subscriber unit, a second allocation of OFDMA subcarriers selected by the base station for use by the subscriber unit, the second allocation of OFDMA subcarriers including an indication of a modulation and coding rate associated with the second allocation of OFDMA subcarriers.