Signal transmission method and device, and terminal

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.

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.