Radio frequency front-end system for reducing interference and method for reducing interference

A method for reducing interference applicable to a radio frequency front-end system, wherein the radio frequency front-end system includes:

• a processing circuit;
• a first transceiver connected to the processing circuit;
• a radio frequency front-end circuit, including:
• a first switch circuit including a plurality of first signal paths formed by a first common terminal and a plurality of first terminals, wherein the first common terminal is connected to the first transceiver;
• a first filter circuit including an all-pass circuit and a first channel filter respectively connected to the plurality of first terminals, wherein the all-pass circuit corresponds to a plurality of channels of a first frequency band, and the first channel filter corresponds to at least one first channel of the plurality of channels;
• and
• a second switch circuit including a plurality of second signal paths formed by a second common terminal and a plurality of second terminals, wherein the plurality of second terminals are connected to the all-pass circuit and the first channel filter, respectively;
• and
• a first antenna connected to the second common terminal,
• wherein the method for reducing interference comprises configuring the processing circuit to:
• control the first switch circuit and the second switch circuit to respectively switch to the first signal path and the second signal path corresponding to the all-pass circuit;
• execute a channel sounding process to scan the plurality of channels of the first frequency band through the first transceiver, so as to determine usage statuses of the plurality of channels;
• execute an automatic channel selection process to select at least one target channel according to the usage statuses of the plurality of channels;
• and
• control, according to the selected at least one target channel, the first switch circuit and the second switch circuit to respectively switch to the first signal path and the second signal path corresponding to the at least one target channel, and control the first transceiver to perform signal transmission.