Patent ID: 7564814
Filing Date: 2009-07-21
Classification: H04B,H04L,Y02D

Abstract:
1. A method of selecting a transmission mode and rate selection in a multiple-input multiple-output (MIMO) wireless communication system, comprising: obtaining channel state information indicative of received signal quality for a wireless channel used for data transmission; obtaining channel information used to transmit data on eigenmodes of a MIMO channel from a steered or unsteered MIMO pilot, wherein the steered MIMO pilot is a pilot sent on the eigenmodes of the MIMO channel and the unsteered MIMO pilot is a pilot comprised of N pilot transmissions sent from N transmit antennas; determining the age of the channel information and the channel state information; selecting a transmission mode from among a plurality of transmission modes based on the age of the channel information, wherein the plurality of transmission modes comprises a steered mode wherein data is transmitted on the eigenmodes of the MIMO channel and an unsteered mode wherein the channel information is not used to transmit data on spatial channels of the MIMO channel; and selecting at least one rate for data transmission based on the channel state information and the age of the channel state information, wherein data is transmitted via the wireless channel in accordance with the selected transmission mode and the selected at least one rate.