Patent ID: 11956185
Assignee: CORNING RESEARCH & DEVELOPMENT CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 22:
23. A distributed communicated system (DCS), comprising:
a central unit configured to:
receive TDD downlink communications signals from a TDD signal source;
distribute the received TDD downlink communications signals over at least one TDD downlink communications link to at least one remote unit among a plurality of remote units;
receive TDD uplink communications signals over a plurality of TDD uplink communications links from the plurality of remote units; and
distribute the received TDD uplink communications signals to TDD signal source;

the plurality of remote units each configured to:
receive the TDD downlink communications signals over a TDD downlink communications link among the at least one TDD downlink communications link
distribute the received TDD downlink communications signals to a user device;
receive TDD uplink communications signals from a user device
distribute the receive TDD uplink communications signals over a TDD uplink communications link among the plurality of TDD uplink communication to the central unit;

at least one remote unit among the plurality of remote units, comprising:
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.