A technology is described for feedback cancellation in a multiband booster. The repeater can comprise: a server antenna port; a donor antenna port; a first direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a second direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a first-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for a single band in a first direction between a donor antenna and a server antenna; and a second-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for the single band in a second direction between the donor antenna and the server antenna.

A technology is described for feedback cancellation in a multiband booster. The repeater can comprise: a server antenna port; a donor antenna port; a first direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a second direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a first-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for a single band in a first direction between a donor antenna and a server antenna; and a second-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for the single band in a second direction between the donor antenna and the server antenna.

The invention relates to wireless repeater systems and methods. In embodiments, such systems and methods involve receiving a wireless transmission signal; and processing the wireless transmission signal using a digital signal processing facility (DSP); wherein the DSP is adapted to filter at least one sub-band of the wireless transmission signal using a digital bandpass filter.

Methods, systems, and devices for wireless communications are described that provide a repeater for beamforming a received signal at a first radio frequency via one or more scan angles or beamforming directions and then retransmitting and beamforming the transmitted signal at the first radio frequency via one or more scan angles or beamforming directions. Repeaters may perform heterodyning or downconverting on the received signal to reduce a frequency of the signal from the first frequency to an intermediate frequency (IF), and then band-pass filter the IF signal around a desired center frequency. The repeater may then heterodyne or upconvert the filtered IF signal back to the first frequency for the retransmission of the signal.

The invention relates to wireless repeater systems and methods. In embodiments, such systems and methods involve receiving a wireless transmission signal; and processing the wireless transmission signal using a digital signal processing facility (DSP); wherein the DSP is adapted to filter at least one sub-band of the wireless transmission signal using a digital bandpass filter.

A wireless video bridge for removing electromagnetic radiation noise includes an interface and a shielding part configured to remove a harmonic signal generated in relation to the interface when the wireless video bridge is operating. The wireless video bridge may provide a technology capable of guaranteeing continuity of surveillance by increasing a data transmission rate when transmitting an image captured by a security camera

A D2D communication control apparatus (10) according to the present invention includes: a communication unit (11) configured to receive determination information that can be used to determine whether each of a plurality of radio terminals is capable of performing device-to-device (D2D) communication with another radio terminal; and a selection unit (12) configured to select, using the determination information between radio terminals that may operate as relay radio terminals, a candidate for a relay radio terminal that relays the communication between one of the plurality of radio terminals and a network, the relay radio terminal candidate transmitting a response signal in response to a first discovery signal transmitted from one of the radio terminals by performing D2D communication with the one of the plurality of radio terminals and performing cellular communication with the network.

There is disclosed a radio relay arrangement for a radio communication network, the radio relay arrangement including: a first relay arrangement with a first transmitter antenna array adapted for transmitting first signaling and a first receiver antenna array adapted for receiving second signaling. The radio relay arrangement further includes a second relay arrangement with a second transmitter antenna array adapted for transmitting third signaling and a second receiver antenna array adapted for receiving fourth signaling. The first transmitter antenna array and the first receiver antenna array are separated by a metallic separator, and the second transmitter antenna array and the second receiver antenna array are separated by a metallic separator. The first signaling is based on received second signaling, and the third signaling is based on received fourth signaling.

An optically-enhanced relay including a first transmitter that converts a first digital transmit signal to a first analog transmit signal, a first receiver that converts a first analog receive signal to a first digital receive signal, a second transmitter that converts a second digital transmit signal to a second analog transmit signal, a second receiver that converts a second analog receive signal to a second digital receive signal, and an optically-enhanced analog self-interference canceller that generates a first self-interference cancellation signal based on at least one of the first digital transmit signal and the first analog transmit signal, and combines the first self-interference cancellation signal with at least one of the first digital receive signal and the first analog receive signal.

A communication device for performing magnetic interference cancellation comprises: a baseband unit including a first transmission chain and a second transmission chain; a first distributed radio unit (RU) connected to the first transmission chain and set to a transmit (Tx) mode; and a second distributed RU connected to the second transmission chain and set to a receive (Rx) mode, wherein the baseband unit includes a phase correction unit, connected to the first transmission chain and the second transmission chain, for performing phase correction for the magnetic interference cancellation on a signal transmitted from the first transmission chain, and the second transmission chain is configured to transmit a signal output from the phase correction unit to the second distributed RU, the second distributed RU uses a signal that was output from the phase correction unit and has passed through the second transmission.