# US 10,484,085 B2 · Signal transmission method and device, and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,085 B2 - Document ID: US10484085B2 - Status: Granted - Kind: B2 - Application number: 15/320,194 - Filed: 2015-01-30 - Published: 2017-06-01 - Granted: 2019-11-19 - Earliest claimed: 2014-12-30 - Assignees: Yulong Computer Telecommuncation Scientific (Shenzhen) Co., Ltd. - Applicants: Yulong Computer Telecommunication Scientific (Shenzhen) Co., Ltd. - Inventors: Linfu Xie; Zhenyu Luo - Web page: https://patentgrep.com/patent/US10484085B2 ## CPC - H04B 7/26: at least one of which is mobile - G01S 19/13: Receivers - H04B 1/3827: Portable transceivers - H04B 7/24: for communication between two or more posts (wireless communication networks H04W) - H04B: TRANSMISSION - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract The present disclosure relates to the technical field of communications. Disclosed are a signal transmission method and device, and a terminal, which can improve the reliability of receiving a signal. The present disclosure is applied to a signal transmission system. The signal transmission system comprises: a first antenna and a global system for mobile communications (GSM) transceiver, wherein the GSM transceiver sends a GSM low-frequency signal to the first antenna, and the first antenna receives a GNSS signal and the GSM low-frequency signal sent by the GSM transceiver. The present disclosure is applicable to receiving a GNSS signal and a GSM low-frequency signal by using one antenna. ## Claims ### Claim 1 A method for signal transmission for a signal transmission system, the signal transmission system comprising a first antenna and a global system for mobile communication (GSM) transceiver, the method comprising: setting insertion loss of a first low-pass filter, a power amplifier, a second low-pass filter, and a third low-pass filter in a GNSS signal frequency band; sending, by the GSM transceiver, a GSM low-frequency signal to the first antenna via the first low-pass filter, the power amplifier, the second low-pass filter, the third low-pass filter, and a frequency divider in sequence; simultaneously receiving, by the first antenna, a mixed signal consisting of a global navigation satellite system (GNSS) signal and the GSM low-frequency signal sent by the GSM transceiver; obtaining, via the frequency divider, the GNSS signal from the mixed signal; and sending the GNSS signal to a GNSS receiver via a high-pass filter, a first bandpass filter, a low-noise amplifier, and a second bandpass filter in sequence. ### Claim 2 (depends on 1) The method of claim 1, wherein the signal transmission system further comprises a second antenna, the method further comprising: sending, by the GSM transceiver, a GSM high-frequency signal to the second antenna; and receiving, by the second antenna, the GSM high-frequency signal sent by the GSM transceiver. ### Claim 3 (depends on 1) The method of claim 1, wherein a first total of spurious power corresponding to the GSM transceiver, insertion loss corresponding to the first low-pass filter, gain corresponding to the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a first preset power; and a second total of spurious power corresponding the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a second preset power. ### Claim 4 (depends on 3) The method of claim 3, wherein the first preset power is a maximum power of spurious signals of a GSM system that interfere with the GNSS signal, and wherein the second preset power is a maximum power of spurious signals with a GNSS frequency band generated by the power amplifier in a GSM low-frequency transmission channel and that cannot interfere with the GNSS signal at a common terminal of the frequency divider. ### Claim 5 (depends on 1) The method of claim 1, wherein the GNSS signal comprises a Global Positioning System (GPS) signal. ### Claim 6 (depends on 1) The method of claim 1, wherein the method further comprises: obtaining, via the frequency divider, the low-frequency GSM signal from the mixed signal; and sending the first low-frequency GSM signal to the GSM transceiver via the third low-pass filter. ### Claim 7 A device for signal transmission for a signal transmission system, the signal transmission system comprising a first antenna, a second antenna, and a global system for mobile communication (GSM) transceiver, the device comprising: a first sending unit used in the GSM transceiver and configured to send a GSM low-frequency signal to the first antenna via a first low-pass filter, a power amplifier, a second low-pass filter, a third low-pass filter, and a frequency divider in sequence; a first receiving unit in the first antenna and configured to simultaneously receive a global navigation satellite system (GNSS) signal and the GSM low-frequency signal sent by the GSM transceiver; a second sending unit used in the first antenna and configured to send the GNSS signal to a GNSS receiver via the frequency divider, a high-pass filter, a first bandpass filter, a low-noise amplifier, and a second bandpass filter in sequence; and a second receiving unit used in the second antenna and configured to receive a GSM high-frequency signal sent by the GSM transceiver. ### Claim 8 (depends on 7) The device of claim 7, wherein the GNSS signal comprises a Global Positioning System (GPS) signal, and wherein the first sending unit is further configured to send the GSM high-frequency signal to the second antenna. ### Claim 9 (depends on 7) The device of claim 7, wherein a first total of spurious power corresponding to the GSM transceiver, insertion loss corresponding to the first low-pass filter, gain corresponding to the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a first preset power; and a second total of spurious power corresponding the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a second preset power. ### Claim 10 (depends on 9) The device of claim 9, wherein the first preset power is a maximum power of spurious signals of a GSM system that interfere with the GNSS signal, and wherein the second preset power is a maximum power of spurious signals with a GNSS frequency band generated by the power amplifier in a GSM low-frequency transmission channel and that cannot interfere with the GNSS signal at a common terminal of the frequency divider. ### Claim 11 (depends on 7) The device of claim 7, wherein insertion loss of the first low-pass filter, the power amplifier, the second low-pass filter, and the third low-pass filter is set in a GNSS signal frequency band. ### Claim 12 A terminal comprising a device for signal transmission for a signal transmission system, the terminal comprising a first antenna, a second antenna, and a global system for mobile communication (GSM) transceiver, the device comprising: a first sending unit used in the GSM transceiver and configured to send a first GSM low-frequency signal to the first antenna via a first low-pass filter, a power amplifier, a second low-pass filter, a third low-pass filter, and a frequency divider in sequence; a first receiving unit in the first antenna and configured to receive a global navigation satellite system (GNSS) signal and the first GSM low-frequency signal sent by the GSM transceiver; a second sending unit used in the first antenna and configured to send the GNSS signal to a GNSS receiver via the frequency divider, a high-pass filter, a first band pass filter, a low-noise amplifier, and a second band pass filter in sequence; and a second receiving unit used in the second antenna and configured to receive a GSM high-frequency signal sent by the GSM transceiver, wherein the first antenna can simultaneously send a second GSM low-frequency signal and receive at least one of the GNSS signal or the first GSM low-frequency signal. ### Claim 13 (depends on 12) The terminal of claim 12, wherein the GNSS signal comprises a Global Positioning System (GPS) signal, and wherein the first sending unit is further configured to send the GSM high-frequency signal to the second antenna. ### Claim 14 (depends on 12) The terminal of claim 12, wherein a first total of spurious power corresponding to the GSM transceiver, insertion loss corresponding to the first low-pass filter, gain corresponding to the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a first preset power; and a second total of spurious power corresponding the power amplifier, insertion loss corresponding to the second low-pass filter, insertion loss corresponding to the third low-pass filter, and isolation corresponding to the frequency divider is less than or equal to a second preset power. ### Claim 15 (depends on 14) The terminal of claim 14, wherein the first preset power is a maximum power of spurious signals of a GSM system that interfere with the GNSS signal, and wherein the second preset power is a maximum power of spurious signals with a GNSS frequency band generated by the power amplifier in a GSM low-frequency transmission channel and that cannot interfere with the GNSS signal at a common terminal of the frequency divider. ### Claim 16 (depends on 12) The terminal of claim 12, wherein insertion loss of the first low-pass filter, the power amplifier, the second low-pass filter, and the third low-pass filter is set in a GNSS signal frequency band. ### Claim 17 (depends on 12) The terminal of claim 12, wherein the first antenna can simultaneously send a second GSM low-frequency signal, receive the GNSS signal, and receive the first GSM low-frequency signal.