An example method of controlling a wireless access point may include causing the wireless access point to identify any groupings of contiguous non-protocol FFT bins of a wireless channel in which all of the non-protocol FFT bins in the grouping have respective signal strength values exceeding a first threshold, and a bandwidth of the grouping does not exceed a second threshold. The method may also include causing the wireless access point to identify any resource units of the wireless channel that overlap with any of the identified groupings. The method may also include causing the wireless access point to, in allocating the resource units to client devices for an OFDMA communication, skip the identified resource units.