Systems and methods for providing communications with an improved network frame structure within wireless sensor networks are disclosed herein. In one embodiment, a system includes a hub having one or more processing units and RF circuitry for transmitting and receiving communications in a wireless network architecture. The system also includes a plurality of sensor nodes each having a wireless device with a transmitter and a receiver to enable bi-directional communications with the hub in the wireless network architecture. The one or more processing units of the hub are configured to execute instructions to cause a change from a first power mode of a receiver of a sensor node to a second power mode upon transmitting notifications to the sensor node during a repeated hub broadcasting time slot.

An electronic circuit for generating a delayed radio signal for use in a radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, is provided. The electronic circuit may include an input circuit, a delay circuit, a down-converting circuit, an up-converting circuit, and an output circuit.

An electronic circuit for generating a delayed radio signal for use in a radio communication device configured to provide a transmit baseband signal in a baseband, to up-convert the transmit baseband signal into a transmit radio signal in a radio band, to transmit the transmit radio signal in the radio band, and to simultaneously receive a receive radio signal in the same radio band, is provided. The electronic circuit may include an input circuit, a delay circuit, a down-converting circuit, an up-converting circuit, and an output circuit.

A radio device transmits outgoing radio signals on a carrier frequency to a further radio device and receives incoming radio signals on the same carrier frequency from the further radio device. The radio device switches at least between a first antenna configuration and a second antenna configuration, e.g., by using a switch. In the first antenna configuration, the outgoing radio signals are transmitted via at least one first antenna while simultaneously the incoming radio signals are received via at least one second antenna. In the second antenna configuration, the outgoing radio signals are transmitted via the at least one second antenna while simultaneously the incoming radio signals are received via the at least one first antenna.

A radio device transmits outgoing radio signals on a carrier frequency to a further radio device and receives incoming radio signals on the same carrier frequency from the further radio device. The radio device switches at least between a first antenna configuration and a second antenna configuration, e.g., by using a switch. In the first antenna configuration, the outgoing radio signals are transmitted via at least one first antenna while simultaneously the incoming radio signals are received via at least one second antenna. In the second antenna configuration, the outgoing radio signals are transmitted via the at least one second antenna while simultaneously the incoming radio signals are received via the at least one first antenna.

A device for reducing a self-interference contribution in a full-duplex wireless communication system configured to transmit a transmission signal and modulated by a baseband signal, and configured to receive a reception signal containing a self-interference contribution corresponding to the transmission signal, the reduction device comprising a first reduction module, configured to take a replica of the transmission signal, and configured to generate a first reduction signal, the device further comprising: a second reduction module, arranged so as to be able to take a replica of the baseband signal, and capable of generating a second reduction signal that is a function of the temporal derivative of the baseband signal, a subtractor, linked to the first reduction module and to the second reduction module, and configured to subtract from the reception signal the first reduction signal and the second reduction signal.

A device for reducing a self-interference contribution in a full-duplex wireless communication system configured to transmit a transmission signal and modulated by a baseband signal, and configured to receive a reception signal containing a self-interference contribution corresponding to the transmission signal, the reduction device comprising a first reduction module, configured to take a replica of the transmission signal, and configured to generate a first reduction signal, the device further comprising: a second reduction module, arranged so as to be able to take a replica of the baseband signal, and capable of generating a second reduction signal that is a function of the temporal derivative of the baseband signal, a subtractor, linked to the first reduction module and to the second reduction module, and configured to subtract from the reception signal the first reduction signal and the second reduction signal.

The communication method includes: sending, by a CMTS (cable modem terminals stem), a reference signal within a first time period by using a valid subcarrier in a first spectrum, where the first time period is a time period within which none of CMs (cable modems) connected to the CMTS sends a signal in the first spectrum; performing, by the CMTS based on an interfering signal received by the CMTS within the first time period, channel interference estimation on a channel that is used during signal reception of the CMTS and that occupies the first spectrum, where the interfering signal is a signal obtained after the reference signal passes through the channel; and canceling, by the CMTS based on a result of the channel interference estimation, interference from a first signal received by the CMTS to a second signal received by the CMTS.

A waveguide unit includes an interface unit configured to receive a transmission radio wave f1.sub.TX1 output from a transmission/reception processing unit, and output a reception radio wave f1.sub.RX1 to the transmission/reception processing unit. Further, the waveguide unit includes a transmission wave input port, a transmission wave output port, a reception wave input port, and a reception wave output port. Further, the waveguide unit includes a reception band-pass filter configured to pass the reception radio wave f1.sub.RX1 of a multiplex reception radio wave input to the reception wave input port and output the reception radio wave f1.sub.RX1 toward the interface unit, and, on the other hand, reflect a reception radio wave f1.sub.RX2 and output the reception radio wave f1.sub.RX2 toward the reception wave output port.

A waveguide unit includes an interface unit configured to receive a transmission radio wave f1.sub.TX1 output from a transmission/reception processing unit, and output a reception radio wave f1.sub.RX1 to the transmission/reception processing unit. Further, the waveguide unit includes a transmission wave input port, a transmission wave output port, a reception wave input port, and a reception wave output port. Further, the waveguide unit includes a reception band-pass filter configured to pass the reception radio wave f1.sub.RX1 of a multiplex reception radio wave input to the reception wave input port and output the reception radio wave f1.sub.RX1 toward the interface unit, and, on the other hand, reflect a reception radio wave f1.sub.RX2 and output the reception radio wave f1.sub.RX2 toward the reception wave output port.