Abstract: There is provided a filter unit for wideband multicarrier FDD operation. The filter unit comprises an MXT, at least one isolator, and a filter bank. The MXT and the filter bank are connected via the at least one isolator. The MXT is configured to receive a TX wideband multicarrier signal as provided by at least one PA, and to 5 provide a first BP filtered TX wideband multicarrier signal to the at least one isolator. The MXT comprises at least one first BP filter structure for first BP filtering of the TX wideband multicarrier signal. The at least one isolator is configured to receive the first BP filtered TX wideband multicarrier signal from the MXT and provide the first BP filtered TX wideband multicarrier signal to the filter bank. The filter bank is 10 configured to receive the first BP filtered TX wideband multicarrier signal from the at least one isolator, and to provide a second BP filtered TX wideband multicarrier signal towards an antenna port.

Abstract: There is provided a filter unit for wideband multicarrier TDD operation. The filter unit comprises a transmission multiplexer (MXT), at least one circulator, and a filter bank. The MXT and the filter bank are connected via the at least one circulator. The MXT is configured to receive a transmission (TX) wideband multicarrier signal as 5 provided by at least one PA, and to provide a first bandpass (BP) filtered TX wideband multicarrier signal to the at least one circulator. The MXT comprises at least one first BP filter structure for first BP filtering of the TX wideband multicarrier signal. The at least one circulator is configured to receive the first BP filtered TX wideband multicarrier signal from the MXT and provide the first BP filtered TX 10 wideband multicarrier signal to the filter bank.

Abstract: There is provided a filter unit for wideband multicarrier FDD operation. The filter unit comprises an MXT, at least one isolator, and a filter bank. The MXT and the filter bank are connected via the at least one isolator. The MXT is configured to receive a TX wideband multicarrier signal as provided by at least one PA, and to 5 provide a first BP filtered TX wideband multicarrier signal to the at least one isolator. The MXT comprises at least one first BP filter structure for first BP filtering of the TX wideband multicarrier signal. The at least one isolator is configured to receive the first BP filtered TX wideband multicarrier signal from the MXT and provide the first BP filtered TX wideband multicarrier signal to the filter bank. The filter bank is 10 configured to receive the first BP filtered TX wideband multicarrier signal from the at least one isolator, and to provide a second BP filtered TX wideband multicarrier signal towards an antenna port.

Abstract: Supporting suppression of distortion caused by a power amplifier, “PA”, included in a transmitter system configured to perform digital predistortion, “DPD”, and feedforward, “FF”, linearization on multiple digital input signals relating to different frequency bands, respectively. The PA is used for power amplification in preparation for transmission by a wireless communication network and is operative with an instantaneous bandwidth, “IBW’”. Information is obtained identifying one or more intermodulation, “IM”, components outside the frequency bands but within the IBW, and caused by said PA. The identified IM components are selectively processed as part of said DPD to thereby suppress formation of at least some of the identified IM components, and/or as part of the FF linearization by adding reference signals to the FF linearization, which reference signals correspond to at least some of the identified IM components.