Patent ID: 8031642
Filing Date: 2011-10-04
Classification: H04B,H04L,H04W

Abstract:
1. A method for controlling power in a wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), comprising: monitoring a cluster signal parameter of each of a plurality of clusters of sub-carriers at a receiver, wherein each cluster comprises a set of sub-carriers that are sequential in frequency and the cluster signal parameter indicates signal fading of the cluster as a whole; feeding information of the cluster signal parameter of a selected cluster as a whole, without signal fading information of each individual sub-carrier in the selected cluster, back to a transmitter that produces and transmits the sub-carriers received by the receiver; controlling the transmitter in response to the cluster signal parameter to selectively increase transmit power of at least one cluster when the cluster signal parameter of the one cluster is below a threshold; using a channel quality indication (CQI) measurement to obtain an averaged signal-to-noise ratio of the cluster from measured signal-to-noise ratios of individual sub-carriers. within the cluster; using the averaged signal-to-noise ratio of the cluster and the corresponding cluster identification number as part of the cluster signal parameter; and wherein at least two transmit antennas are used to transmit each signal to achieve transmit diversity, the method further comprising: obtaining CQI measurements on signals respectively from the at least two transmit antennas, and producing a composite cluster signal parameter from the composite CQI measurements to indicate signal fading of each cluster as a whole at the receiver.