Institute of Electrical & Electronic Engineers
Two techniques for channel estimation and co-channel interference rejection are presented for the Multiple-Input Multiple-Output (MIMO) uplink in the Long Term Evolution-Advanced (LTE-Advanced) system. The first technique consists of estimating the desired users' channels in the Frequency Domain (FD) before estimating interference covariance matrices for interference rejection. In the second technique, channel and interference covariance matrices are estimated jointly via a Time Domain (TD) approach. Interference rejection is achieved by using the channel and interference covariance matrix estimates in the MIMO equalizer. Significant interference rejection gains are observed.