Systems and methods for beamforming training in wireless local area networks

A method, implemented by a first responder device, as one of a plurality of responder devices, the method comprising:

• receiving, by the first responder device from an initiator device, one or more frames including scheduling information that announces a feedback period, the one or more frames including at least one training field, each respective training field including a plurality of training subfields positioned at an end of a respective frame of the one or more frames;
• transmitting, by the first responder device to the initiator device, a beamforming-feedback response during a feedback period time slot in the announced feedback period,
• wherein:
• the announced feedback period is a contention-based feedback period such that the first responder device and at least one other responder device can have contending beamforming-feedback responses during the feedback period time slot within the announced feedback period, and
• the beamforming-feedback response is transmitted on a transmit beam of the first responder device that is associated with a receive beam of the first responder device;
• and
• receiving, by the first responder device from the initiator device, at least one acknowledgment frame.