Rui Dinis Nuno Souto João Carlos Silva Atul Kumar Américo Correia On the Use of Implicit Pilots for Channel Estimation with OFDM Modulations. 1077-1081 2007 conf/vtc/2007f VTC Fall http://dx.doi.org/10.1109/VETECF.2007.233 db/conf/vtc/vtc2007f.html#DinisSSKC07