US 11,930,445 B2
Single-carrier quadrature amplitude modulation (SC-QAM) downstream channel fast pre-scanning
Xing Feng, Shenzhen (CN); Jinji Guo, Shenzhen (CN); Pingbo Liu, Guangdong (CN); and Feng Li, Guangdong (CN)
Assigned to ARRIS ENTERPRISES LLC, Horsham, PA (US)
Appl. No. 17/434,852
Filed by ARRIS Enterprises LLC, Suwanee, GA (US)
PCT Filed Sep. 18, 2020, PCT No. PCT/CN2020/116323
§ 371(c)(1), (2) Date Aug. 30, 2021,
PCT Pub. No. WO2022/056883, PCT Pub. Date Mar. 24, 2022.
Prior Publication US 2022/0312302 A1, Sep. 29, 2022
Int. Cl. H04W 48/16 (2009.01); H04L 12/28 (2006.01)
CPC H04W 48/16 (2013.01) [H04L 12/2801 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A modem, comprising:
a memory storing computer-readable instructions; and
a processor configured to execute the computer-readable instructions to:
simultaneously begin an orthogonal frequency-division multiplexing (OFDM) downstream (DS) channel scan in a foreground process and a single-carrier quadrature amplitude modulation (SC-QAM) DS channel scan in a background process;
store SC-QAM DS channels identified in the background process in a table;
determine whether an OFDM DS channel has been locked onto;
stop the SC-QAM DS channel scan in the background process and begin a normal SC-QAM DS channel scan based on a scan of all OFDM DS channels and failure to lock onto any OFDM DS channels;
scan SC-QAM DS channels in the table; and
become operational with an SC-QAM DS channel obtained from the table.