Patent ID: 7206354

Claim:
A method of calibrating downlink and uplink channels in a wireless multiple-input multiple-output (MIMO) communication system, comprising: deriving a first transmit matrix based on a first pilot received via a MIMO channel between a transmitting entity and a receiving entity; deriving a second transmit matrix based on a MIMO channel response estimate and first and second calibration error matrices, the MIMO channel response estimate being an estimate of a response of the MIMO channel and derived based on a second pilot received via the MIMO channel, the first calibration error matrix containing estimates of errors in a first correction matrix used to account for responses of transmit and receive chains at the transmitting entity, and the second calibration error matrix containing estimates of errors in a second correction matrix used to account for responses of transmit and receive chains at the receiving entity; and revising the first and second calibration error matrices based on the first and second transmit matrices.