A system and methods for cancelling transmission leakage signals in a wide bandwidth Distributed Antenna System (DAS) having remote units is disclosed. An internal cancellation circuit within the remote unit is employed to reduce the transmitted leakage signals by generating a cancellation signal. This cancellation signal is added to the received signal to cancel the transmission leakage signal in the receiving signal path. A pilot signal generation circuit is employed to optimize the cancellation circuit operating parameters. The frequency of the pilot signal is swept over a range to determine the pilot frequency having the highest electromagnetic coupling. The amplitude and phase of the cancellation signal is then optimized to minimize the level of transmission leakage in the receiving transmission path.

Disclosed are a method, computing device, and a non-transitory computer-readable medium storing computer-executable instructions which, when executed, cause a processor to perform operations, which may include: sending a transmit signal including non-linear elements; receiving another signal comprising at least a portion of the transmit signal through a receive chain of a computing device; simulating the transmit chain; generating, by the simulated transmit chain, a first signal associated with the transmit signal; generating a second signal by frequency shifting the first signal; generating one or more first kernels associated with the second signal; performing decimation of the one or more first kernels; transforming the one or more first kernels using a lower triangular matrix, into one or more second kernels; combining the one or more second kernels to generate an echo cancellation signal; and subtracting the echo cancellation signal from the received at least a portion of the transmit signal.

This application discloses an electronic device. The electronic device includes: a SAR sensor, where the SAR sensor includes a first detection channel and a second detection channel; and a first antenna electrode and a second antenna electrode, where the first antenna electrode is connected to the SAR sensor through the first detection channel, the second antenna electrode is connected to the SAR sensor through the second detection channel, and the SAR sensor determines a distance between the electronic device and a human body by using a signal of the first antenna electrode and/or a signal of the second antenna electrode; where an adjustment path is disposed between the first antenna electrode and the second antenna electrode, and the adjustment path is configured to adjust a connection status between the first antenna electrode and the second antenna electrode.

A high-frequency switch module includes a switch IC, a phase adjustment circuit, and a filter circuit. The phase adjustment circuit, which includes an inductor and capacitors, includes a -type circuit in which the inductor is connected in series between an individual terminal and the filter circuit. The filter circuit is an LC parallel resonant circuit including a filter inductor and a filter capacitor. A distortion second harmonic signal from the individual terminal of the switch IC is reflected by the filter circuit through the phase adjustment circuit and returns to the switch IC through the phase adjustment circuit. This distortion second harmonic signal, whose phase is adjusted by the phase adjustment circuit, is cancelled out by a distortion second harmonic signal output to a common terminal of the switch IC.

A receiving device includes a receiving unit that receives, via a receiving antenna, an image signal including an in-vivo image of a subject that is captured by an in-vivo-image acquiring device introduced into the subject; a transmitting unit that wirelessly transmits the image signal to a real-time display device that displays the in-vivo image in real time; a detecting unit that detects a non-receiving period in which the receiving unit does not receive the image signal; and a control unit that performs a control to wirelessly transmit the image signal to the real-time display device during the non-receiving period immediately after receipt of the image signal by the receiving unit.

A portable electronic device includes an antenna unit, a processor, a circuit board and a frequency switching circuit. The antenna unit includes a pin. The processor includes a signal control terminal to output a voltage control signal. The frequency switching circuit is disposed on the circuit board and connected to the signal control terminal and the pin, so as to switch the frequency of the antenna unit according to the voltage control signal. The frequency switching circuit includes a switch unit and an anti-noise unit. The switch unit is connected to the pin, and the anti-noise unit is connected to the signal control terminal and the switch unit.

A radio frequency (RF) signal separation and suppression system includes an input that couples in a radio frequency signal comprising desired and undesired radio frequency signals. The RF signal separation and suppression system also includes a reproduction generator connected to the input. The reproduction generator produces a reproduction from the radio frequency signal of the undesired signal at an output. The RF signal separation and suppression system also includes an electrical subtractor having a first input that is electrically connected to the output of the reproduction generator and a second input that is electrically connected to the input of the radio frequency signal separation system. An output of the subtractor generates an output radio frequency signal comprising the desired radio frequency signal and a suppressed undesired radio frequency signal.

A method for operating a transceiver includes generating, by the transceiver, a first signal that includes an estimate of an interference signal leaked from a transmit path to a receive path of the transceiver. Generating the first signal includes obtaining a baseband transmit signal that includes a baseband of a transmit signal transmitted via the transmit path. Generating the first signal also includes calculating a harmonic phase that includes a phase of a harmonic of the baseband transmit signal. Generating the first signal also includes estimating a phase shift in accordance with an envelope of the baseband transmit signal. Generating the first signal also includes determining a phase of the first signal in accordance with the estimated phase shift and the calculated harmonic phase such that interference of a receive signal received via the receive path is reduced according to the first signal.

Various aspects described herein relate to providing analog interference cancelation in a shared antenna. A plurality of signals can be obtained at a plurality of reference points in a transmitter chain of a shared antenna. At least one reference point of the plurality of reference points from which to generate a cancelation signal and/or at least one injection point for injecting the cancelation signal can be selected based at least in part on expected analog interference cancelation metrics related to each of the plurality of reference points and/or the at least one injection point. The cancelation signal can be generated based at least in part on the at least one reference point and/or injection point. The cancelation signal can be injected in the injection point at a receiver chain of the shared antenna to cancel interference from signals generated at the transmitter chain of the shared antenna.

A method for performing self-interference cancellation (SIC) by an apparatus of a full duplex radio (FDR) mode in a wireless communication system including: performing a channel estimation of a received self-interference reference signal; calculating a power value of two order components of a non-linear self-interference signal based on the channel estimation; and establishing a non-linear digital self-interference cancellation order to be considered in the self-interference cancellation based on the power value of each for the two order components.