Isolation between a first path and a second path is improved. A radio frequency module is capable of operating in a first mode in which simultaneous transmission, simultaneous reception, or simultaneous transmission and reception using both a first filter and a second filter is possible, and in a second mode in which transmission or reception using only the first filter is possible. A first switching element is provided in a first path that is usable between an antenna terminal and the first filter in the first mode, and a second switching element is provided between the first path and a ground. A third switching element is provided in a second path that is usable between the antenna terminal and the first filter in the second mode, and a fourth switching element is provided between the second path and the ground. The radio frequency module further includes a phase shifter.

A disclosure of this specification provides a device configured to operate in a wireless system, the device comprising: a transceiver configured with an Evolved Universal Terrestrial Radio Access (E-UTRA)-New Radio (NR) Dual Connectivity (EN-DC), wherein the EN-DC is configured to use three bands, a processor operably connectable to the transceiver, wherein the processer is configured to: control the transceiver to receive a downlink signal, control the transceiver to transmit an uplink signal via at least two bands among the three bands, wherein a value of Maximum Sensitivity Degradation (MSD) is applied to a reference sensitivity for receiving the downlink signal.

The invention relates to a system for interference cancellation and method thereof. The system includes a receiver, a transmitter, and a channel estimating and equalizing device. The transmitter and the receiver use different wireless communication technologies to transmit and receive data. The channel estimating and equalizing device can estimate the channel between the transmitter and the receiver for interference cancellation. The embodiments of the invention provide a system and a method thereof for reducing interferences generated when using one wireless communication technology to transmit signals but using another wireless communication technology to receive signals by using digital baseband signals.

Communication terminals configured for satellite and terrestrial communications and methods of use are disclosed herein. In an embodiment, a communication terminal includes an antenna, a filter and filter control circuitry. The antenna is configured to receive a radio signal. The filter is configured to filter the radio signal to remove an interference signal. The filter control circuitry is configured to detect the interference signal present in the radio signal received by the antenna and cause an adjustment to the filter to block the interference signal. In another embodiment, the communication terminal includes an amplifier and gain control circuitry. The amplifier is configured to configured to amplify the radio signal. The gain control circuitry is configured to detect an interference signal present in the radio signal received by the antenna and cause an adjustment to the amplifier based on the detected interference signal.

A transceiver arrangement comprising a receiver and a transmitter arranged for frequency-division duplex communication with a communication network, a transmission port for connecting to an antenna, a balancing impedance circuit arranged to provide an adaptive impedance arranged to mimic the impedance at the transmission port, a filtering arrangement connecting the receiver, transmitter, transmission port and balancing impedance circuit, and a common-mode signal reduction circuit is disclosed. The filter arrangement comprises filters of a first type arranged to pass signals at transmitter frequency and attenuate signals at receiver frequency and are connected between the transmitter and the transmission port and between the receiver and the balancing impedance circuit, and filters of a second type arranged to attenuate signals at transmitter frequency and pass signals at receiver frequency and are connected between the transmitter and the balancing impedance circuit and between the receiver and the transmission port. The common-mode signal reduction circuit comprises an inverting amplifier, the input of the inverting amplifier is provided by a voltage division between a first and a second impedance where the first and second impedance have equal impedances, and the output of the amplifier is provided to junction of a third and a fourth impedance where the third and fourth impedances have equal impedances, and the first and second impedances, and the third and fourth impedances, respectively, are connected in series between a filter of the first type and a filter of the second type. A communication device and method are also disclosed.

A transceiver arrangement comprising a receiver and a transmitter arranged for frequency-division duplex communication with a communication network, a transmission port for connecting to an antenna, a balancing impedance circuit arranged to provide an adaptive impedance arranged to mimic the impedance at the transmission port, a filtering arrangement connecting the receiver, transmitter, transmission port and balancing impedance circuit, and a common-mode signal reduction circuit is disclosed. The filter arrangement comprises filters of a first type arranged to pass signals at transmitter frequency and attenuate signals at receiver frequency and are connected between the transmitter and the transmission port and between the receiver and the balancing impedance circuit, and filters of a second type arranged to attenuate signals at transmitter frequency and pass signals at receiver frequency and are connected between the transmitter and the balancing impedance circuit and between the receiver and the transmission port. The common-mode signal reduction circuit comprises an inverting amplifier, the input of the inverting amplifier is provided by a voltage division between a first and a second impedance where the first and second impedance have equal impedances, and the output of the amplifier is provided to junction of a third and a fourth impedance where the third and fourth impedances have equal impedances, and the first and second impedances, and the third and fourth impedances, respectively, are connected in series between a filter of the first type and a filter of the second type. A communication device and method are also disclosed.

RF duplexing and methods of operating the same are described herein. In one embodiment, an RF duplexing system may include a control circuit and a duplexer with a first tunable RF filter and second tunable RF filter. The control circuit is operable in a full duplexing transmission mode and a half duplexing transmission mode. The control circuit tunes the first tunable RF filter in the full duplexing transmission mode so that the first tunable RF filter defines a transmission passband and tune the second tunable RF filter so that the second tunable RF filter defines a receive passband. Also, the control circuit tunes one of the tunable RF filters so that the tunable RF filter defines the passband while the other tunable RF filter enhances the passband. In this manner, the tunable RF filters in the duplexer are both utilized to get better performance during the half duplexing mode.

RF duplexing and methods of operating the same are described herein. In one embodiment, an RF duplexing system may include a control circuit and a duplexer with a first tunable RF filter and second tunable RF filter. The control circuit is operable in a full duplexing transmission mode and a half duplexing transmission mode. The control circuit tunes the first tunable RF filter in the full duplexing transmission mode so that the first tunable RF filter defines a transmission passband and tune the second tunable RF filter so that the second tunable RF filter defines a receive passband. Also, the control circuit tunes one of the tunable RF filters so that the tunable RF filter defines the passband while the other tunable RF filter enhances the passband. In this manner, the tunable RF filters in the duplexer are both utilized to get better performance during the half duplexing mode.

A vector modulator of a transceiver may be provided that includes: a variable resistor having one end to which an input signal is transmitted; a variable capacitor which is connected in parallel to the variable resistor and has one end to which the input signal is transmitted; and a summing circuit which sums a signal of the other end of the variable resistor and a signal of the other of the variable capacitor.

A vector modulator of a transceiver may be provided that includes: a variable resistor having one end to which an input signal is transmitted; a variable capacitor which is connected in parallel to the variable resistor and has one end to which the input signal is transmitted; and a summing circuit which sums a signal of the other end of the variable resistor and a signal of the other of the variable capacitor.