Wireless devices and systems including examples of compensating power amplifier noise

A system comprising:

• a communication device attached to a stationary object, the communication device comprising a plurality of antennas;
• at least one vehicle configured to move past the communication device, the communication device and the at least one vehicle configured to form an ad hoc network to transmit communications from the communication device to the at least one vehicle;
• wherein the communication device comprises a switch configured to at least partially compensate non-linear power amplifier noise in the communications from the communication device to the at least one vehicle, the switch configured to selectively activate a first switch path that provides feedback from an output of a transmitter path to a pre-distortion (DPD) filter of the transmitter path via a receiver path;
• a plurality of wireless transceivers, each wireless transceiver configured to provide a respective signal of a plurality of signals to a respective antenna of the plurality of antennas, at least one of the plurality of wireless transceivers comprising the transmitter path and the receiver path;
• and
• a plurality of power amplifiers configured to receive respective signals and to amplify the signals to generate respective amplified signals of a plurality of amplified signals, each amplified signal including a portion of the non-linear power amplifier noise.

A system comprising:

• a base station comprising:
• a transmit antenna;
• a transmitter configured to transmit a first communications signal via the transmit antenna, the transmitter comprising a digital pre-distortion (DPD) filter;
• a receive antenna;
• a receiver configured to receive a second communications signal via the receive antenna;
• and
• a switch configured to selectively activate a first switch path to couple the transmitter and the transmit antenna and a second switch path to couple the receiver and the transmitter to provide the first communications signal as feedback for the DPD filter to the receiver from the transmitter, wherein the switch is further configured to receive a selection signal indicating whether the second switch path is to be activated, the selection signal based partly on a transmission time interval (TTI) of a time-division duplex (TDD) configured radio frame;
• and
• at least one mobile device within a communications range of the base station, the base station and the at least one mobile device configured to form a hierarchical network for the base station to transmit and receive, respectively, the first and second communications signals.

A system comprising:

• a first device comprising:
• a transmitter configured to transmit a first communication signal via a transmit antenna, the transmitter comprising a digital pre-distortion (DPD) filter;
• a receiver configured to receive a second communication signal;
• and
• a switch configured to selectively activate a first switch path to couple the transmitter and the transmit antenna and a second switch path to couple the receiver and the transmitter to provide at least a portion of the first communication signal as feedback for the DPD filter to the receiver from the transmitter, wherein the switch is further configured to receive a selection signal indicating whether the second switch path is to be activated, the selection signal based partly on a transmission time interval (TTI) of a time-division duplex (TDD) configured radio frame;
• and
• a second device configured to communicate with the first device via a device-to-device (D2D) connection.