US 12,244,438 B2
System and method for detecting of channel conditions and channel estimation in an orthogonal frequency division multiplexing (OFDM) receiver
Alexander Kleinerman, Austin, TX (US)
Assigned to Silicon Laboratories Inc., Austin, TX (US)
Filed by Silicon Laboratories Inc., Austin, TX (US)
Filed on Mar. 28, 2023, as Appl. No. 18/191,735.
Application 18/191,735 is a division of application No. 17/104,063, filed on Nov. 25, 2020, granted, now 11,652,667.
Prior Publication US 2023/0239177 A1, Jul. 27, 2023
Int. Cl. H04L 27/01 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01); H04L 27/26 (2006.01)
CPC H04L 25/0202 (2013.01) [H04L 5/001 (2013.01); H04L 27/2649 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, in a receiver, a radio frequency (RF) signal;
processing, in the receiver, the RF signal to obtain a plurality of orthogonal frequency division multiplexing (OFDM) symbols, each of the plurality of OFDM symbols comprising a plurality of sub-carriers;
computing a first pilot channel estimate for a first channel condition and a second pilot channel estimate for a second channel condition based on a first set of pilot sub-carriers of the plurality of sub-carriers;
determining a first noise estimate using the first pilot channel estimate and a second set of pilot sub-carriers of the plurality of sub-carriers;
determining a second noise estimate using the second pilot channel estimate and the second set of pilot sub-carriers;
selecting one of the first pilot channel estimate and the second pilot channel estimate based at least in part on a comparison between the first noise estimate and the second noise estimate; and
configuring at least a demodulator of the receiver based at least in part on the selected first or second pilot channel estimate.