A radio frequency front end module is provided for a high power capability and a high signal band selectivity. The front end module includes an external filter and an integrated circuit coupled with the external filter via two external filter leads. The integrated circuit includes a transmit-receive switch, a power amplifier and a low noise amplifier. The transmit-receive switch alternates between coupling an antenna port to a transmit port and coupling the antenna port to a receive port. The power amplifier amplifies a modulated radio frequency signal. The low noise amplifier amplifies a received radio frequency signal when the antenna port is coupled to the receive port. The external filter can be replaced to adapt to various requirements of signal frequency bands, without the need of modifying the layout of the integrated circuit.

A multiplexer includes a common port, multiple filter branches and at least one switch included in a switched filter branch of the multiple filter branches. The filter branches are connected to the common port, and each filter branch corresponds to at least one predetermined frequency band and filters a radio frequency (RF) signal according to the corresponding at least one predetermined frequency band. In a first switch state of the at least one switch, the switched filter branch includes a high-Q filter having multiple high-Q components for improving roll-off of the filtered RF signal, and in a second switch state of the at least one switch, the switched filter branch includes a low-Q filter having multiple low-Q components that support a very high bandwidth for filtering the RF signal.

A wireless transceiver includes: a switching amplifier having first, second and power ports; and a current provider. The current provider provides a current to the power port, and further provides an impedance to the power port such that an impedance of the switching amplifier at the second port matches an impedance of an antenna coupled to the second port. The switching amplifier simultaneously amplifies a transmit signal input received at the first port to generate an output signal at the second port for receipt by the antenna, and mixes a receive signal received at the second port from the antenna with the transmit signal input to generate, at the power port, another output signal having a frequency lower than that of the receive signal.

An example of a signal switch includes a first transistor coupled between first and second nodes, a plurality of second transistors coupled in series between the first and second nodes, in parallel with the first transistor, a third transistor coupled between the first node and a third node, and a plurality of fourth transistors coupled in series between the first and third nodes, in parallel with the third transistor. The signal switch further includes a first shunt path including a first shunt transistor and a first inductor connected in series between a reference node and a first connection point between two of the plurality of second transistors, and a second shunt path including a second shunt transistor and a second inductor connected in series between the reference node and a second connection point between two of the plurality of fourth transistors.

A signal switch includes a first node and a second node. A first transistor is coupled between the first and second nodes, and a plurality of second transistors is coupled in series between the first and second nodes, in parallel with the first transistor. A shunt transistor and inductor, coupled in series, are firstly connected between two of the plurality of second transistors and are secondly connected to a reference node.

A portable wireless communications adapter includes a wireless receiver, a wireless transmitter, an electronic interface connector, and a location sensing module. The wireless receiver is configured to receive wireless data over a Wireless Avionics Intra-Communication (WAIC) frequency range between 4.2 gigahertz (GHz) and 4.4 GHz. The wireless transmitter is configured to send wireless data over the WAIC frequency range between 4.2 GHz and 4.4 GHz. The electronic interface connector is configured to mate with a portable electronic device for communication of the wireless data with the portable electronic device. The location sensing module is configured to determine a location of the portable wireless communications adapter relative to an interior of an aircraft based on WAIC communications received at the wireless receiver and selectively enable and disable the wireless transmitter based on the determined location.

A flexible radio assignment algorithm that reduces co-channel interference in Wi-Fi networks is disclosed. The flexible radio assignment algorithm calculates a density value for each of the APs controlled by a network controller. The flexible radio assignment algorithm selects an AP with the highest density value and determines that a radio in the selected AP is redundant. The flexible radio assignment algorithm manages the redundant radio in the selected AP to mitigate co-channel interference in a frequency band.

Disclosed are systems and methods related to reducing intermodulation products in an RF output signal by matching an impedance of the power amplifier to an impedance of the antenna and concurrently blocking signals having a second fundamental frequency received by the antenna when the antenna is transmitting to inhibit intermodulation products of the first and second fundamental frequencies from re-radiating from the antenna. The matching and blocking are performed concurrently by a single circuit with combined matching and blocking functionality.

The present disclosure relates to methods, a user equipment and a radio network node for interference mitigation in a dynamic TDD system comprising a user equipment (201, 700), a serving base station (202) serving the user equipment (201, 700), at least one neighboring base station (203) and at least one neighboring user equipment (204) served by the at least neighboring base station (203). The method comprises obtaining (S301) link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station (203) or uplink transmission of the at least one neighboring user equipment (204). The method further comprises mitigating (S302) interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter. The methods, user equipment and radio network node of the present disclosure may overcome or alleviate the interference issues in the dynamic TDD system and give quality and efficiency of the wireless communication a big boost.

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.