Abstract: A frequency-division duplex communication apparatus, including a first radio frequency port, a second radio frequency port coupled to an antenna, a third radio frequency port, a fourth radio frequency port coupled to a balancing circuit, and a filtering arrangement having filters of a first type, a filter of a second type and a filter of a third type. The filters of the first type pass signals at a first frequency band and reject signals at a second frequency band. The filter of the second type rejects signals at the first frequency band and passes signals at the second frequency band. The filter of the third type rejects signals at the first frequency band and passes signals at the second frequency band and the phase response of the filter of the second type is 180 degrees from the phase response of the filter of the third type.

Abstract: A frequency-division duplex communication apparatus, including a first radio frequency port, a second radio frequency port coupled to an antenna, a third radio frequency port, a fourth radio frequency port coupled to a balancing circuit, and a filtering arrangement having filters of a first type, a filter of a second type and a filter of a third type. The filters of the first type pass signals at a first frequency band and reject signals at a second frequency band. The filter of the second type rejects signals at the first frequency band and passes signals at the second frequency band. The filter of the third type rejects signals at the first frequency band and passes signals at the second frequency band and the phase response of the filter of the second type is 180 degrees from the phase response of the filter of the third type.

Abstract: Radio network node and method therein, for communication in a wireless communication system. The radio network node comprises: a plurality of antenna elements, a plurality of transceivers, wherein the plurality of transceivers comprise a first subset of the plurality of transceivers coupled to a first subset of the plurality of antenna elements and a second subset of the plurality of transceivers coupled to a second subset of the plurality of antenna elements; and a controller configured to adjust the first subset of the transceivers to work at a first frequency band, and to adjust the second subset of the transceivers to work at a second frequency band.

Abstract: Radio network node and method therein, for communication in a wireless communication system. The radio network node comprises: a plurality of antenna elements, a plurality of transceivers, wherein the plurality of transceivers comprise a first subset of the plurality of transceivers coupled to a first subset of the plurality of antenna elements and a second subset of the plurality of transceivers coupled to a second subset of the plurality of antenna elements; and a controller configured to adjust the first subset of the transceivers to work at a first frequency band, and to adjust the second subset of the transceivers to work at a second frequency band.

Abstract: Radio network node and method therein, for communication in a wireless communication system. The radio network node comprises: a plurality of antenna elements, forming an antenna array; a plurality of transceivers, each transceiver coupled to at least one dedicated antenna element of the antenna array; and a controller configured to adjust a first subset of the transceivers to work at a first frequency band, and to adjust a second subset of the transceivers to work at a second frequency band. The first subset of transceivers and the second subset of transceivers (are disjoint and configured to operate at their respective frequency bands simultaneously.

Abstract: A radio frequency circuit is described, which comprises a first power amplifier comprising a first output, a second power amplifier comprising a second output, a third power amplifier comprising a third output, and a fourth power amplifier comprising a fourth output. The first power amplifier, the second power amplifier, the third power amplifier and the fourth power amplifier are configured to perform an amplification based on a radio communication signal to produce a first amplifier output signal, a second amplifier output signal, a third amplifier output signal, and a fourth amplifier output signal. Furthermore, the present application also relates to a transmitter comprising such a radio frequency amplifier circuit.

Abstract: Radio network node and method therein, for communication in a wireless communication system. The radio network node comprises: a plurality of antenna elements, forming an antenna array; a plurality of transceivers, each transceiver coupled to at least one dedicated antenna element of the antenna array; and a controller configured to adjust a first subset of the transceivers to work at a first frequency band, and to adjust a second subset of the transceivers to work at a second frequency band. The first subset of transceivers and the second subset of transceivers (are disjoint and configured to operate at their respective frequency bands simultaneously.

Abstract: A radio frequency circuit is described, which comprises a first power amplifier comprising a first output, a second power amplifier comprising a second output, a third power amplifier comprising a third output, and a fourth power amplifier comprising a fourth output. The first power amplifier, the second power amplifier, the third power amplifier and the fourth power amplifier are configured to perform an amplification based on a radio communication signal to produce a first amplifier output signal, a second amplifier output signal, a third amplifier output signal, and a fourth amplifier output signal. Furthermore, the present application also relates to a transmitter comprising such a radio frequency amplifier circuit.

Abstract: A digital quadrature modulator holds local oscillator circuitry configured to provide local oscillator signals, and local oscillator polarity logic circuitry configured to select an In-phase and a Quadrature local oscillator signal according to a sign bit of an In-phase control word and a sign bit of a Quadrature control word, respectively. The modulator holds a number of local oscillator control logic circuits, each configured to generate a conditioned signal by gating one or both of the selected local oscillator signals according to values of the In-phase control word and/or values of the Quadrature control word. The modulator has one or more sets of switched-capacitor units, where each unit has an output provided by an output capacitor, and where a signal at the input side of the output capacitor is controlled by a conditioned signal. The outputs of at least two of the switched-capacitor units are combined in a common node.

Abstract: A digital quadrature modulator holds local oscillator circuitry configured to provide local oscillator signals, and local oscillator polarity logic circuitry configured to select an In-phase and a Quadrature local oscillator signal according to a sign bit of an In-phase control word and a sign bit of a Quadrature control word, respectively. The modulator holds a number of local oscillator control logic circuits, each configured to generate a conditioned signal by gating one or both of the selected local oscillator signals according to values of the In-phase control word and/or values of the Quadrature control word. The modulator has one or more sets of switched-capacitor units, where each unit has an output provided by an output capacitor, and where a signal at the input side of the output capacitor is controlled by a conditioned signal. The outputs of at least two of the switched-capacitor units are combined in a common node.

Abstract: An apparatus comprises a tunable duplexer configured to output a transmission signal to be wirelessly transmitted from the apparatus at a transmission frequency, and configured to input a reception signal wirelessly received by the apparatus at a reception frequency, a tuning device connected to the tunable duplexer, configured to control a balance between impedances of an antenna port and of a balance port of the tunable duplexer, a transmitting device configured to, during a predetermined time period, wirelessly transmit a specific transmission signal for calibration of the tunable duplexer, a receiving device configured to, during the predetermined time period, wirelessly receive the specific transmission signal transmitted by the transmitting device, and a measuring device configured to, during the predetermined time period, measure the power of the specific transmission signal received by the receiving device.

Abstract: An apparatus comprises a tunable duplexer configured to output a transmission signal to be wirelessly transmitted from the apparatus at a transmission frequency, and configured to input a reception signal wirelessly received by the apparatus at a reception frequency, a tuning device connected to the tunable duplexer, configured to control a balance between impedances of an antenna port and of a balance port of the tunable duplexer, a transmitting device configured to, during a predetermined time period, wirelessly transmit a specific transmission signal for calibration of the tunable duplexer, a receiving device configured to, during the predetermined time period, wirelessly receive the specific transmission signal transmitted by the transmitting device, and a measuring device configured to, during the predetermined time period, measure the power of the specific transmission signal received by the receiving device.

Abstract: Methods, apparatus and computer-readable storage mediums for determining a characteristic of a signal transmitted from a wireless transmitter, using a measurement receiver. A first characteristic, calculated in respect of a first time period, and a second characteristic, calculated in respect of a second time period, are used to extrapolate a measured characteristic, measured over the first time period, to determine a determined characteristic for the second time period.

Abstract: An electrical balance duplexer comprising an electrical balance load having an electrical balance load connection, an antenna connection, a first differential power amplifier output connection, a second differential power amplifier output connection; and a power combiner configured to combine output power signals from the first differential power amplifier output connection with output power signals from the second differential power amplifier output connection into the antenna connection and into the electrical balance load connection.

Abstract: Methods, apparatus and computer-readable storage mediums for determining a characteristic of a signal transmitted from a wireless transmitter, using a measurement receiver. A first characteristic, calculated in respect of a first time period, and a second characteristic, calculated in respect of a second time period, are used to extrapolate a measured characteristic, measured over the first time period, to determine a determined characteristic for the second time period.