FIG. 15 shows a block diagram 1500 of a communications manager 1520 that supports subcarrier mapping techniques for GI-based OFDM communications in accordance with aspects of the present disclosure. The communications manager 1520 may be an example of aspects of a communications manager 1320, a communications manager 1420, or both, as described herein. The communications manager 1520, or various components thereof, may be an example of means for performing various aspects of subcarrier mapping techniques for GI-based OFDM communications as described herein. For example, the communications manager 1520 may include a GI sequence manager 1525, a permutation matrix manager 1530, an OFDM symbol manager 1535, a configuration manager 1540, a sub-matrix manager 1545, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).