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

Patent metadata

Field	Value
Publication number	US-12224790-B2
Application number	US-202217936428-A
Country	US
Kind code	B2
Filing date	Sep 29, 2022
Priority date	Jan 22, 2022
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A radio frequency (RF) front-end system and a method for reducing interference are provided. The RF front-end system includes a processing circuit, a first transceiver, an RF front-end circuit, and a first antenna. The RF front-end circuit includes a first switch circuit, a first filter circuit, and a second switch circuit. The first switch circuit and the second switch circuit respectively include first signal paths and second signal paths. The first filter circuit includes an all-pass circuit corresponding to a first frequency band and a first channel filter corresponding to a first frequency channel. The processing circuit executes an anti-interference process, including: switching to the all-pass circuit; executing a channel sounding process to determine usage statuses of a plurality of channels; executing an automatic channel selection process to select a target channel; and switching to the target channel, and controlling the first transceiver to perform signal transmission.

First claim

What is claimed is:

1. A radio frequency front-end system for reducing interference, comprising:
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 processing circuit is configured to execute an anti-interference process, including:
controlling 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;
executing 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;
executing an automatic channel selection process to select at least one target channel according to the usage statuses of the plurality of channels; and
controlling, 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 controlling the first transceiver to perform signal transmission.

2. The radio frequency front-end system according to claim 1 , wherein the first filter circuit further includes a second channel filter, and the plurality of first terminals are connected to the all-pass circuit, the first channel filter, and the second channel filter, respectively, the plurality of second terminals are connected to the all-pass circuit, the first channel filter, and the second channel filter, respectively, and the second channel filter corresponds to at least one second channel of the plurality of channels.

3. The radio frequency front-end system according to claim 2 , wherein the first frequency band is a WI-FI 2.4 GHz frequency band, a quantity of the plurality of channels is eleven, the at least one first channel at least corresponds to channel 1 of the plurality of channels, and the at least one second channel at least corresponds to channel 11 of the plurality of channels.

4. The radio frequency front-end system according to claim 3 , wherein the radio frequency front-end circuit further includes:
a third switch circuit including a plurality of third signal paths formed by a third common terminal and a plurality of third terminals, wherein the third common terminal is connected to the second common terminal;
a second filter circuit including a plurality of custom filters, wherein the plurality of custom filters are respectively connected to the plurality of third terminals and respectively correspond to a plurality of custom frequency bands; and
a fourth switch circuit including a plurality of fourth signal paths formed by a fourth common terminal and a plurality of fourth terminals, wherein the plurality of fourth terminals are connected to the plurality of custom filters, respectively,
wherein the anti-interference process further includes:
obtaining one of the plurality of custom frequency bands that is selected by a user; and
controlling, according to the selected custom frequency band, the third switch circuit and the fourth switch circuit to respectively switch to the third signal path and the fourth signal path corresponding to the selected custom frequency band.

5. The radio frequency front-end system according to claim 1 , wherein the anti-interference process further includes:
controlling the first transceiver to perform signal transmission for a predetermined time, and controlling the first switch circuit and the second switch circuit to switch again to the first signal path and the second signal path corresponding to the all-pass circuit, respectively; and
executing the channel sounding process again to update the usage statuses of the plurality of channels, and executing the automatic channel selection process again to reselect the at least one target channel according to the usage statuses of the plurality of channels.

6. The radio frequency front-end system according to claim 1 , further comprising:
a second transceiver connected to the processing circuit; and
a second antenna connected to the second transceiver,
wherein, in the step of executing the channel sounding process, the processing circuit further controls the second transceiver to scan the plurality of channels of the first frequency band in real time through the second antenna, so as to determine the usage statuses of the plurality of channels in real time.

7. 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.

8. The method according to claim 7 , wherein the first filter circuit further includes a second channel filter, and the plurality of first terminals are connected to the all-pass circuit, the first channel filter, and the second channel filter, respectively, the plurality of second terminals are connected to the all-pass cir

Assignees

• Wistron Neweb Corp

Inventors

• Lin Chi-Te
• Wang Chih-Hao

Classifications

• H04B1/1027 Primary

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H04B1/1036

  with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H) · CPC title

• H04B1/525 Primary

  with means for reducing leakage of transmitter signal into the receiver · CPC title