US 11,956,185 B2
Time-division duplexing (TDD) detection in wireless distributed communications systems (DCS) to synchronize TDD downlink and uplink communications, and related methods
Benjamin Imanilov, Hod haSharon (IL); and Guy Lupescu, Tel Aviv (IL)
Assigned to CORNING RESEARCH & DEVELOPMENT CORPORATION, Corning, NY (US)
Filed by Corning Research & Development Corporation, Corning, NY (US)
Filed on Apr. 15, 2021, as Appl. No. 17/231,663.
Claims priority of provisional application 63/010,375, filed on Apr. 15, 2020.
Prior Publication US 2021/0328754 A1, Oct. 21, 2021
Int. Cl. H04L 5/14 (2006.01); H04B 17/336 (2015.01); H04W 56/00 (2009.01)
CPC H04L 5/1469 (2013.01) [H04B 17/336 (2015.01); H04W 56/001 (2013.01)] 26 Claims
OG exemplary drawing
 
1. An adaptive time-division duplexed (TDD) communications synchronization circuit, comprising:
a power detector circuit configured to:
receive a TDD downlink communications signal formatted for a TDD communication frame comprising a TDD downlink time period and a TDD uplink time period on a TDD downlink communications link;
detect a noise signal level on the TDD downlink communications link over a defined duration of the TDD communication frame that covers at least a portion of the TDD uplink time period;
set a noise threshold floor level for the TDD downlink communications link based on the detected noise signal level in the TDD uplink time period of the TDD communication frame;
detect the TDD downlink communications signal exceeding the noise threshold floor level; and
detect the TDD downlink time period in the TDD communication frame based on the detect the TDD downlink communications signal exceeding the noise threshold floor level; and
a downlink/uplink switch circuit coupled to an input/output node, the downlink downlink/uplink switch circuit configured to pass the detected TDD downlink communications signal to the input/output node during the detected TDD downlink time period.