Won Jun Hwang Jun-Hee Jang Hyung-Jin Choi An enhanced channel estimation method for MU-MIMO based LTE-Advanced system. 163-167 2011 APCC https://doi.org/10.1109/APCC.2011.6152797 conf/apcc/2011 db/conf/apcc/apcc2011.html#HwangJC11