Power-efficient channel condition feedback for OFDM channels

摘要

A wireless data communications device having a corresponding method and computer program comprises a Multiple Input, Multiple Output (MIMO) transceiver to communicate on an Orthogonal Frequency Division Modulation (OFDM) channel; a measurement circuit having an active state and an inactive state, wherein the measurement circuit measures a channel condition of the OFDM channel in the active state; and a controller to place the measurement circuit in the active state after a request for the channel condition is received on the OFDM channel, and to place the measurement circuit in the inactive state after the measurement circuit measures the channel condition of the OFDM channel and until a further request for the channel condition is received on the OFDM channel.