I believe the tool inhttp://paul.wad.homepage.dk/LTE/lte_resource_grid.htmlhas a bug. When 1.4 MHz and 4 PDCCH OFDM symbol are generated for 1 antenna port configuration, the RS signals for the 2nd port (which must be assumed if actual config has only 1 port), are not being reserved. Instead, they are marked as being assigned for PDCCH, which I think is wrong ?
I am not able to observe the same. May be he would have corrected it.