Channel estimation and co-channel interference rejection for LTE-Advanced MIMO uplink

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.