A METHOD OF CALIBRATING DOWNLINK AND UPLINK CHANNELS IN A WIRELESS MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM

摘要

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. Fig. 2