CN-117040994-B - Synchronization method, system, signal processing method, signal processing module and medium

CN117040994BCN 117040994 BCN117040994 BCN 117040994BCN-117040994-B

Abstract

The invention discloses a synchronization method, a system, a signal processing method, a signal processing module and a medium, wherein the system comprises a frequency mixing module, a filter, a signal processing module and a signal generator, the synchronization method comprises the steps of mixing a carrier signal and a local oscillator signal through the frequency mixing module to obtain a mixed signal, filtering a difference frequency signal in the mixed signal through the filter, determining the frequency of the difference frequency signal through the signal processing module, determining the frequency of the carrier signal based on the frequency of the difference frequency signal, setting the frequency of the local oscillator signal output by the signal generator as the frequency of the carrier signal through the signal processing module, and adjusting the phase of the local oscillator signal until the local oscillator signal obtains a maximum value through the frequency mixing module and the signal output by the filter. The invention sets the frequency of the local oscillation signal as the frequency of the carrier signal, adjusts the phase of the local oscillation signal, realizes the phase and frequency synchronization of the local oscillation signal and the carrier signal, further realizes the multiplexing of circuits, and reduces the complexity and the cost of a communication system.

Inventors

ZHANG MING
WANG YINSONG

Assignees

星觅(上海)科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230911

Claims (10)

1. A synchronization method, applied to a synchronization system, the synchronization system comprising a mixing module, a filter, a signal processing module, and a signal generator, the method comprising: The carrier signal and the local oscillation signal are mixed by the mixing module to obtain a mixed signal; filtering out a difference frequency signal in the mixed signal through the filter; determining, by the signal processing module, a frequency of the difference frequency signal and determining, based on the frequency of the difference frequency signal, a frequency of the carrier signal; And setting the frequency of the local oscillation signal output by the signal generator as the frequency of the carrier signal through the signal processing module, and adjusting the phase of the local oscillation signal until the local oscillation signal obtains the maximum value through the signals output by the frequency mixing module and the filter.
2. The method of claim 1, wherein the mixing, by the mixing module, the carrier signal and the local oscillator signal to obtain a mixed signal, comprises: Receiving a carrier signal transmitted by a transmitting end through an antenna in the mixing module; And acquiring the carrier signal and the local oscillation signal output by the signal generator through a mixer in the mixing module, and mixing the carrier signal and the local oscillation signal to obtain a mixed signal.
3. The method of claim 2, further comprising, after receiving the carrier signal transmitted by the transmitting end via an antenna in the mixing module: and amplifying the carrier signal through an amplifier in the mixing module to obtain an amplified carrier signal.
4. The method of claim 1, wherein determining, by the signal processing module, the frequency of the carrier signal based on the frequency of the difference signal comprises: the frequency of the local oscillation signal output by the signal generator is adjusted to be the sum value or the difference value of the original frequency of the local oscillation signal and the frequency of the difference frequency signal through the signal processing module; and determining whether the signals output by the local oscillation signals after the frequency adjustment pass through the frequency mixing module and the filter are zero intermediate frequency signals or not through the signal processing module, and if so, determining that the frequencies of the local oscillation signals after the frequency adjustment are consistent with the frequencies of the carrier signals.
5. The synchronous system is characterized by comprising a mixing module, a filter, a signal processing module and a signal generator; The frequency mixing module is respectively connected with the filter and the signal generator, and the signal processing module is respectively connected with the signal generator and the filter; The frequency mixing module is used for mixing the carrier signal and the local oscillation signal to obtain a mixed signal; the filter is used for filtering out a difference frequency signal in the mixed signals; the signal processing module is used for determining the frequency of the difference frequency signal and determining the frequency of the carrier signal based on the frequency; The signal processing module is used for setting the frequency of the local oscillation signal output by the signal generator as the frequency of the carrier signal, and adjusting the phase of the local oscillation signal until the local oscillation signal obtains the maximum value through the frequency mixing module and the filter.
6. The synchronization system of claim 5, wherein the synchronization system is configured to synchronize, The frequency mixing module comprises an antenna, an amplifier and a frequency mixer, wherein the amplifier is respectively connected with the antenna and the frequency mixer; The antenna is used for receiving carrier signals; the amplifier is used for amplifying the carrier signal; The mixer is used for mixing the amplified carrier signal with the local oscillation signal output by the signal generator to obtain a mixed signal.
7. The synchronization system of claim 5, wherein the filter is a low pass filter.
8. A signal processing method applied to a signal processing module in a synchronization system, the synchronization system further comprising a mixing module, a filter and a signal generator, the method comprising: Determining the frequency of a difference frequency signal output by the filter; determining a frequency of the carrier signal based on the frequency; Setting the frequency of the local oscillation signal output by the signal generator as the frequency of the carrier signal, and adjusting the phase of the local oscillation signal until the local oscillation signal obtains the maximum value through the signals output by the frequency mixing module and the filter.
9. A signal processing module, comprising: At least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the signal processing method of claim 8.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, the computer instructions are for causing a processor to perform the signal processing method as claimed in claim 8.

Description

Synchronization method, system, signal processing method, signal processing module and medium Technical Field The present invention relates to the field of communications technologies, and in particular, to a synchronization method and system. Background With the development of electric and networking of automobiles, a great deal of communication requirements are met. Synchronizing the local signal with the accepted radio signal carrier may enable faster communication speeds. Existing carrier synchronization methods mostly extract carriers from received wireless signals. The structure is complex, and carrier extraction circuits needed to be used for different modulation methods are different, so that a plurality of corresponding extraction circuits are needed to be designed on the chip design, and the cost is increased. Such as heterodyne architecture, is often used in current communication systems. Taking quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) modulation and demodulation as an example, the whole communication system is implemented in a process that a received radio signal is amplified by a low noise amplifier (Low Noise Amplifier, LNA), mixed with two local oscillation signals with 90 DEG phase difference by a mixer, and the output signals are filtered out by a low pass filter to obtain I, Q two paths of signals. And then input to baseband for sampling to learn information loaded on the carrier wave. However, if the local oscillation signal is not synchronized with the carrier signal before communication, the QAM demodulation information may be scrambled. Disclosure of Invention The invention provides a synchronization method and a synchronization system, which are used for solving the problems that the existing carrier synchronization method is complex in structure and different in carrier extraction circuits required to be used for different modulation methods, so that a plurality of corresponding extraction circuits are required to be designed on chip design, and the cost is increased. In a first aspect, an embodiment of the present invention provides a synchronization method applied to a synchronization system, where the synchronization system includes a mixing module, a filter, a signal processing module, and a signal generator, and the method includes: The carrier signal and the local oscillation signal are mixed by the mixing module to obtain a mixed signal; filtering out a difference frequency signal in the mixed signal through the filter; determining, by the signal processing module, a frequency of the difference frequency signal and determining, based on the frequency of the difference frequency signal, a frequency of the carrier signal; And setting the frequency of the local oscillation signal output by the signal generator as the frequency of the carrier signal through the signal processing module, and adjusting the phase of the local oscillation signal until the local oscillation signal obtains the maximum value through the signals output by the frequency mixing module and the filter. Optionally, the mixing the carrier signal and the local oscillator signal by the mixing module to obtain a mixed signal includes: Receiving a carrier signal transmitted by a transmitting end through an antenna in the mixing module; And acquiring the carrier signal and the local oscillation signal output by the signal generator through a mixer in the mixing module, and mixing the carrier signal and the local oscillation signal to obtain a mixed signal. Optionally, after receiving the carrier signal transmitted by the transmitting end through the antenna in the mixing module, the method further includes: and amplifying the carrier signal through an amplifier in the mixing module to obtain an amplified carrier signal. Optionally, determining, by the signal processing module, the frequency of the carrier signal based on the frequency of the difference frequency signal includes: the frequency of the local oscillation signal output by the signal generator is adjusted to be the sum value or the difference value of the original frequency of the local oscillation signal and the frequency of the difference frequency signal through the signal processing module; and determining whether the signals output by the local oscillation signals after the frequency adjustment pass through the frequency mixing module and the filter are zero intermediate frequency signals or not through the signal processing module, and if so, determining that the frequencies of the local oscillation signals after the frequency adjustment are consistent with the frequencies of the carrier signals. In a second aspect, an embodiment of the present invention provides a synchronization system, including a mixing module, a filter, a signal processing module, and a signal generator; The frequency mixing module is respectively connected with the filter and the signal generator, and the signal processing module is respectively c