For example, a wireless communication Station (STA) may be configured to determine a data field processing setting for a data field of a Physical Layer (PHY) Protocol Data Unit (PPDU) such that a padding parameter value corresponding to the data field processing setting does not exceed a padding parameter threshold, wherein the data field processing setting includes at least one of a Modulation and Coding Scheme (MCS) index or a channel Bandwidth (BW) setting, wherein the padding parameter value corresponding to the data field processing setting is based on a number of pre Forward Error Correction (FEC) (pre-FEC) pad bits according to the data field processing setting; and to encode the data field according to a FEC coding using the number of pre-FEC pad bits according to the data field processing setting.