A radio transmitter as well as a method and a controller therefor are disclosed. According to an embodiment, the radio transmitter comprises a power amplifier, a filter unit, a circulator, a switch and a reflection cancellation unit. The filter unit is capable of filtering an output from the power amplifier during a downlink time division duplex (TDD) slot and filtering an uplink signal during an uplink TDD slot. The circulator has a first port coupled to the power amplifier, a second port coupled to the filter unit, and a third port coupled to the switch. The switch is capable of coupling the third port of the circulator to a termination load during the downlink TDD slot and coupling the third port of the circulator to an uplink reception path during the uplink TDD slot. The reflection cancellation unit is coupled between the switch and the termination load and is capable of generating a first reflection signal that propagates to the first port of the circulator via the switch and the third port of the circulator during the downlink TDD slot.