Compressed feedback format for WLAN

摘要

Channel data for a plurality of OFDM tones for one or more spatial or space-time streams are determined. A plurality of angle values associated with the one or more spatial or space-time streams and the one or more OFDM tones of the plurality of OFDM tones are determined. For each of the one or more spatial or space time streams, a per-tone signal to noise ratio (PT-SNR) associated with one or more OFDM tone of the plurality of OFDM tones is determined, and an average signal to noise ratio (avg-SNR) is determined by averaging signal to noise ratio (SNR) values corresponding to one or more OFDM tones of the plurality of OFDM tones. A feedback report is generated to include at least i) the plurality of angle values, ii) the PT-SNRs, and iii) the avg-SNR.

主权项

1. A method comprising:
transmitting, from a first communication device, a sounding packet using one or more spatial or space-time streams and modulated using orthogonal frequency division multiplexing (OFDM); receiving, at the first communication device, a feedback packet that was transmitted by a second communication device, the feedback packet including a feedback report corresponding to the sounding packet, the feedback report including
i) a plurality of angle values associated with the one or more spatial or space-time streams and one or more OFDM tones corresponding to the sounding packet,ii) deltas corresponding to per-tone signal to noise ratio (PT-SNRs) associated with the one or more spatial or space-time streams and at least some of the one or more OFDM tones, wherein each delta corresponds to a difference between the respective PT-SNR and the an average signal to noise ratio (avg-SNR) associated with the one or more spatial or space-time streams, andiii) the avg-SNR associated with the one or more spatial or space-time streams; and using, at the first communication device, the feedback report to beamform transmissions to the second communication device.