US 12,438,630 B2
Signal to interference and noise ratio estimation
Audrey Yazdanparast, Richfield, OH (US); and Brian D. Hart, Sunnyvale, CA (US)
Assigned to Cisco Technology, Inc.
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Feb. 14, 2023, as Appl. No. 18/168,754.
Prior Publication US 2024/0275505 A1, Aug. 15, 2024
Int. Cl. H04B 17/336 (2015.01)
CPC H04B 17/336 (2015.01) 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving a Physical Layer Protocol Data Unit including a Legacy Long Training Field (LLTF);
extracting a first transmission symbol, a second transmission symbol, and a third transmission symbol from the LLTF;
determining a first group of fragmented symbols, a second group of fragmented symbols, and a third group of fragmented symbols using the first transmission symbol, the second transmission symbol, and the third transmission symbol, wherein the first group of fragmented symbols, the second group of fragmented symbols, and the third group of fragmented symbols include fragments of the LLTF;
determining a Sum of Squared Magnitudes (SSM) of noise using the first group of fragmented symbols and the second group of fragmented symbols;
determining an SSM of signal using Inter Symbol Interference (ISI) free fragments of the LLTF and the SSM of noise;
determining an SSM of ISI using fragments of the LLTF and the SSM of noise; and
estimating a Signal to Interference and Noise Ratio (SINR) using the SSM of noise, the SSM of signal, and the SSM of ISI.