Subcarrier indices for distributed-tone resource units in 6GHz low-power indoor systems

A method, comprising:

• distributing frequency tones of a resource unit (RU) over a distribution bandwidth as a distributed-tone RU (DRU);
• generating a plurality of subcarrier indices for the distributed-tone RU such that a distribution of the distributed-tone RU is symmetric to a direct-current (DC) tone along an axis of subcarrier indices;
• and
• communicating wirelessly using the distributed-tone RU in a 6 GHz low-power indoor (LPI) system,
• wherein the distributed-tone RU comprises a left-side portion and a right-side portion with respect to the DC tone, which is a center DC tone of a plurality of DC tones, and
• wherein the distributed-tone RU is symmetric to the center DC tone in which:
• the center DC tone is located symmetrically between the left-side portion and the right-side portion,
• a first pattern of tone distribution in the left-side portion and a second pattern of tone distribution in the right-side portion are symmetric with respect to the center DC tone, and
• the first pattern and the second pattern are opposite of each other in a two-dimensional (2D) space with one axis of DRU index in permutation order and another axis of subcarrier indices.