US Patent No. 9,232,429

COMPRESSED FEEDBACK FORMAT FOR WLAN


Patent No. 9,232,429
Issue Date January 05, 2016 
Title Compressed Feedback Format For Wlan
Inventorship Hongyuan Zhang, Fremont, CA (US)
Sudhir Srinivasa, Sunnyvale, CA (US)
Hyukjoon Kwon, San Diego, CA (US)
Raja Banerjea, Sunnyvale, CA (US)
Assignee MARVELL WORLD TRADE LTD., St. Michael (BB)

Claim of US Patent No. 9,232,429

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, and

iii) 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.