Channel Estimation Techniques for FDD MIMO Systems

摘要

In certain embodiments, a frequency-division duplexing (FDD) communication system has (i) a multiple in, multiple-out (MIMO) node with multiple MIMO-node antennas and (ii) a second node (e.g., a relay or a repeater) with at least one second-node antenna. The MIMO node transmits downlink (DL) signals to the second node over multiple DL channels in a DL frequency band (FB), and the second node transmits uplink (UL) signals to the MIMO node over multiple UL channels in a UL FB different from the DL FB. The MIMO node receives pilot signals from the second node in the UL and DL FBs and generates UL and DL FB channel state information (CSI) based on the received pilot signals. The MIMO node decodes UL data signals from the second node based on the UL FB CSI and generating DL data signals to the second node based on the DL FB CSI.