US 11,729,028 B2
System and method for blind channel estimation and coherent differential equalization in an orthogonal frequency division multiplexing (OFDM) receiver
Alexander Kleinerman, Austin, TX (US); and Bradley Arthur Wallace, Austin, TX (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Dec. 17, 2020, as Appl. No. 17/124,561.
Prior Publication US 2022/0200825 A1, Jun. 23, 2022
Int. Cl. H04L 25/02 (2006.01); H04L 27/06 (2006.01); H04B 17/309 (2015.01); H04L 27/26 (2006.01); H04L 25/06 (2006.01)
CPC H04L 25/0238 (2013.01) [H04L 25/0204 (2013.01); H04L 25/0236 (2013.01); H04L 25/067 (2013.01); H04L 27/2636 (2013.01)] 20 Claims
OG exemplary drawing
 
9. A method comprising:
receiving radio frequency signals with a front end circuit of a wireless device, and converting the radio frequency signals into frequency domain data;
determining, in a channel estimation circuit of receiver of the wireless device, and based on the frequency domain data, a plurality of channel estimates within an evaluation window having a plurality of frequency carriers including a first frequency carrier, each of the plurality of channel estimates for one of the plurality of frequency carriers;
calculating, in a calculation circuit of the receiver, a plurality of metrics for each of the plurality of frequency carriers using at least some of the plurality of channel estimates; and
determining a soft decision for the first frequency carrier based at least in part on the plurality of metrics; and
performing coherent demodulation for a differentially encoded quadrature phase shift keying orthogonal frequency division multiplexing symbol using the soft decision.