US 12,323,153 B2
Wireless per-frame-based local oscillator trimming for uplink multi-user transmission
Amit Shaw, Bangalore (IN); and Nutan Reddy Annapu Reddy, Hyderabad (IN)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Jun. 16, 2023, as Appl. No. 18/336,640.
Prior Publication US 2024/0421824 A1, Dec. 19, 2024
Int. Cl. H04L 27/28 (2006.01); H03L 7/07 (2006.01); H04L 27/26 (2006.01)
CPC H03L 7/07 (2013.01) [H04L 27/2657 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wireless device comprising:
a radio comprising a front end and a first local oscillator (LO); and
control logic coupled to the radio, the control logic to:
determine, from a received trigger frame directed at a plurality of wireless devices, a carrier frequency offset (CFO) between a first carrier frequency of the first LO and a second carrier frequency of a second LO of an access point operating in a multi-user transmission mode; and
trigger, based on the CFO, an LO trim of the first LO to adjust the first carrier frequency to match, within a threshold tolerance, the second carrier frequency; and
wherein the radio is to transmit, to the access point, a protocol data unit frame using the trimmed first LO, the protocol data unit frame to facilitate the access point to, within the multi-user transmission mode, synchronize concurrent reception of multiple uplink transmissions from the plurality of wireless devices.