Apparatus and method for sounding wireless channel

摘要

A method and system for improving the accuracy of phase and frequency offset during multiple in multiple out (MIMO) channel estimation in a sounding procedure. The improved phase and frequency offset process selects resource allocation unit configuration to ensure a minimum pilot density from the available operation modes. A method for reducing the data in the feedback matrix of the sounding procedure correlates the long training frame (LTF) and number of groups (Ng) between the sounding frame and the feedback to improve efficiency in the amount of feedback that is returned.

主权项

1. A non-transitory computer-readable medium having stored therein computer code, which when executed by a networking device functioning as a beamformer in a wireless local area network (WLAN), cause the networking device to perform a set of operations to improve a sounding procedure where a steering matrix or a compressed beamforming report is utilized by the beamformer using feedback from at least one beamformee, the steering matrix or compressed beamforming report to determine a spatial path for transmission from the beamformer to a set of beamformees in the WLAN, the set of operations comprising:
selecting, by the beamformer, a bandwidth for a sounding frame used to perform the sounding procedure; generating, by the beamformer, the sounding frame at the selected bandwidth using a mode of operation from a plurality of modes of operation, wherein each mode of operation corresponds to a frame format and the mode of operation used to generate the sounding frame has a minimum pilot tone density amongst frame formats of the plurality of modes of operation with the selected bandwidth; and transmitting the sounding frame to the set of beamformees.