Signal capturing method, communication terminal, storage medium and related electronic device
By combining cross-correlation and delay correlation operations in the signal capture device, the detection threshold is dynamically adjusted, which solves the problem of signal capture difficulties under low signal-to-noise ratio, significantly reduces the risk of type error judgment and missed detection, and adapts to long-distance low power consumption Communication requirements have improved the performance of 5G NR downlink synchronization.
Patent Information
- Application Number
- CN202411570218.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-01-10
AI Technical Summary
In long-distance low-power communication scenarios, it is difficult for signal capture devices to accurately distinguish target signals and noise in low signal-to-noise ratio environments, resulting in high risk of type error judgment and missed detection, especially when applications such as direct connection between mobile phones and satellites, Existing signal capture schemes have poor performance.
By performing cross-correlation operations on the baseband received signal and the local main synchronization signal, the peaks of the main synchronization signal of different serial numbers are compared according to the preset constraints, the pseudo-peak values are screened out, and the signal-to-noise ratio changes are sensed by cyclic prefix delay correlation operations, and dynamically adjust the signal-to-noise ratio changes are realized by cyclic prefix delay correlation operations. Detect thresholds to reduce the risk of missed detection and type misjudgment risks.
It achieves improved signal capture performance under low signal-to-noise ratio, reduces the risk of type error judgment and missed detection, adapts to a communication environment with lower signal-to-noise ratio, and improves the compatibility and accuracy of 5G NR downlink synchronization.
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Figure CN119298933A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of communications, and more specifically, to a signal capturing method, a communication terminal, a storage medium and related electronic devices. Background Art
[0002] In the field of communications (including wireless communications, satellite communications, etc.), communication terminals (such as receivers) should be able to accurately capture downlink signals from ground base stations or satellites. However, when encountering long-distance low-power communication scenarios, the target signal to be captured is often submerged in noise, and it is difficult for the signal receiving device to accurately distinguish it. Especially when encountering application requirements such as mobile phones directly connecting to satellites and communications in harsh environments, the performance of existing signal capture solutions is poor, and people in this field urgently need to solve this technical problem. Summary of the invention
[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a signal capture method, a communication terminal, a storage medium and related electronic devices, which reduce the risk of type misjudgment, reduce the risk of missed detection caused by peak reduction, and can adapt to communication environments with lower signal-to-noise ratios.
[0004] The object of the present invention is achieved through the following solutions:
[0005] In a first aspect, the present application provides a signal acquisition method, characterized in that it comprises the steps of:
[0006] Performing cross-correlation operation on the baseband received signal and the local master synchronization signal;
[0007] Comparing the peak values of the main synchronization signals of different sequence numbers in the cross-correlation operation according to the preset constraint conditions;
[0008] Peaks that do not meet the constraint conditions are determined to be pseudo peaks, and the pseudo peaks of the correlation operation are screened out.
[0009] A possible implementation method further includes the steps of:
[0010] Performing a delayed correlation operation on a cyclic prefix of a primary synchronization signal in a baseband received signal;
[0011] The delayed correlation operation is used to sense changes in the signal-to-noise ratio, and the detection threshold of the cross-correlation operation is dynamically adjusted according to the sensed changes in the signal-to-noise ratio.
[0012] In a possible implementation manner, the constraint condition is specifically set according to the relationship between the cross-correlation operation peaks of primary synchronization signals with different sequence numbers.
[0013] In a possible implementation, after performing the cross-correlation operation on the primary synchronization signal in the baseband received signal, the method further includes searching for a cross-correlation operation peak value to find a maximum peak value and a corresponding primary synchronization signal sequence number.
[0014] In one possible implementation, the comparison of the peak values of main synchronization signals of different sequence numbers in the mutual correlation operation according to preset constraints specifically includes: judging whether the maximum peak value satisfies the ratio condition compared with the peak value related to the main synchronization signal sequence number according to a preset ratio condition, and the ratio condition is used to make the peak value related to the main synchronization signal of the target sequence number greater than the peak values related to other sequence numbers.
[0015] In a possible implementation, the delayed correlation operation is used to sense the change of the signal-to-noise ratio, and the detection threshold of the cross-correlation operation is dynamically adjusted according to the sensed change of the signal-to-noise ratio, which specifically includes the following sub-steps:
[0016] A threshold is generated based on the delay correlation operation and a judgment is made. If the judgment is passed, the main synchronization signal sequence number, the start time and the success indication are output; if the judgment is not passed, the detection continues.
[0017] In a second aspect, the present application provides a communication terminal, including:
[0018] A first calculation module, used for performing a cross-correlation operation on a baseband received signal and a local primary synchronization signal;
[0019] A comparison module, used for comparing the peak values of main synchronization signals with different sequence numbers of the cross-correlation operation according to preset constraints;
[0020] A judgment module, used for judging a peak value that does not meet the constraint condition as a pseudo peak value;
[0021] The screening module is used to screen out the pseudo peak value of the correlation operation.
[0022] In a third aspect, the present application provides an electronic device, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein:
[0023] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform any of the above methods.
[0024] In a fourth aspect, the present application provides a computer-readable storage medium. When a computer program in the computer-readable storage medium is executed by a processor of an electronic device, the electronic device can execute any of the methods described above.
[0025] In a fifth aspect, the present application provides a chip, comprising a processor, wherein the processor is connected to a memory and is used to execute a computer program or instruction stored in the memory, so that the chip implements the method described in any one of the above items.
[0026] The beneficial effects of the present invention include:
[0027] (1) The method of the present application actually provides a main synchronization signal detection and timing synchronization method combining cross-correlation and delay correlation, which can be applied to terminal baseband chips, software radios, host computers and other products. Its performance under low signal-to-noise ratio is better than that of the cross-correlation algorithm, and it is compatible with 5G NR downlink synchronization in different communication scenarios.
[0028] (2) In the design of the main synchronization signal detection and timing synchronization method of the present application, the detection threshold is dynamically adjusted based on the CP delay correlation operation, which can adapt to the change of the signal-to-noise ratio with low complexity.
[0029] (3) In the design of the main synchronization signal detection and timing synchronization method, the method of the present application enhances the horizontal comparison of the correlation peaks of main synchronization signals with different sequence numbers by setting a proportional condition to cope with abnormal operation values that may occur when the downlink synchronization block does not arrive.
[0030] (4) Compared with some existing SSB capture technologies or main synchronization signal detection and timing synchronization technologies, the method of the present application has made targeted designs for the risk of type misjudgment and missed detection in low signal-to-noise ratio conditions. It can adapt to communication environments with lower signal-to-noise ratios and is closer to the needs of long-distance low-power applications such as mobile phones directly connecting to satellites.
[0031] (5) The method of the present application uses cross-correlation and delay correlation in combination, uses CP delay correlation detection to sense the signal-to-noise ratio, and dynamically adjusts the cross-correlation detection threshold, which can reduce the risk of missed detection caused by peak reduction.
[0032] (6) The method of the present application performs a stricter comparison of the peak values of the correlation operations of the main synchronization signals with different serial numbers, and can filter out the false peak values of the correlation operations when the main synchronization signal has not arrived, thereby reducing the risk of misjudgment of the type. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0034] Figure 1 This is a schematic diagram of the capture process of the SSB signal;
[0035] Figure 2 A schematic diagram of a flow chart of an embodiment method provided in this application;
[0036] Figure 3 A schematic diagram of a method for joint detection of PSS time domain cross-correlation and CP delay correlation in an embodiment provided in the present application;
[0037] Figure 4 The figure compares the capture accuracy of the existing solution and the solution of the embodiment of the present application under the AWGN channel. DETAILED DESCRIPTION
[0038] All features disclosed in all embodiments of this specification, or steps in all methods or processes disclosed implicitly, except for mutually exclusive features and / or steps, can be combined and / or expanded and replaced in any way. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. The terms "first", "second" and corresponding terminology labels in the specification, claims and drawings of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, which is merely a way of distinguishing objects of the same attributes when describing the embodiments of this application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that a process, method, system, product or device containing a series of units is not necessarily limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or devices.
[0039] In view of the problems in the background, the inventors of this application have experienced the following creative analysis and thinking and believe that: in communication scenarios under low signal-to-noise ratio, such as 5G communication scenarios, according to the 5G New Radio (NR) physical layer protocol, the communication terminal (for example, receiver, etc.) implements cell access based on the downlink synchronization block (Synchronization Signal Block, SSB) signal. This means that the receiver (terminal) should be able to accurately capture the SSB signal sent by the ground base station. Specifically, this capture process realizes two major functions: detection and timing synchronization. Detection refers to the receiver distinguishing noise and target signals from the received signal and identifying the type of target signal according to a certain baseband processing algorithm. Timing synchronization refers to the receiver estimating the starting position of the target signal from the received signal according to a certain baseband processing algorithm, so that the entire target signal can be obtained based on prior information (target signal length).
[0040] The common capture process of SSB signal is as follows Figure 1As shown in the figure, since the Primary Synchronization Signal (PSS) is the first symbol of SSB, the core task of SSB capture is to detect and synchronize the PSS. The receiver executes the capture algorithm to determine whether the PSS has arrived from the baseband received signal from the down-conversion module (generally, set in the receiving communication terminal), and obtains the type of PSS (generally, there are 3 possible sequence numbers) and the starting time to complete the capture of SSB. PSS is composed of m-sequence (generally speaking, PSS is composed of m-sequence (M-sequence or Maximum Lengthsequence, maximum length sequence). In the design of PSS, pseudo-random sequence generation technology is borrowed, where m-sequence is a specific type of pseudo-random binary sequence. In communication systems, m-sequences are widely used in synchronization and identification processes due to their good autocorrelation and cross-correlation characteristics. Its correlation characteristics, that is, the cross-correlation function of the specified PSS and the PSS of the other two serial numbers and the noise has no obvious peak, and its autocorrelation function is at zero. It is worth noting that the inventors of the present application believe that in long-distance and low-power communication scenarios, SSB is usually submerged in noise, and the correlation characteristics of the received signal are weakened; it is difficult for the receiver to distinguish between PSS and noise, let alone timing synchronization. Therefore, when facing application requirements such as direct connection of mobile phones to satellites, the design of the SSB capture method needs to consider the applicability under low signal-to-noise ratio.
[0041] After further analysis, the inventor believes that the more specific technical problem is that under low signal-to-noise ratio, noise interferes with the correlation function, making the calculation peak unclear. An unclear peak brings two risks. One is the misjudgment of the signal type, misjudging the noise as PSS, or misjudging the PSS of a specified sequence number as the PSS of another sequence number, which usually causes timing deviation; the other is signal missed detection, where the receiver cannot find the peak that meets the threshold, thereby missing the SSB signal that has arrived. From the design perspective of solving technical problems, the inventor of this application believes that countermeasures should be proposed to the problem of unclear peaks under low signal-to-noise ratios, as well as solutions to the risk of missed detection.
[0042] In view of the above practical technical problems confirmed after creative thinking and analysis, the inventors of this application propose the following solutions to the problems:
[0043] In an optional technical solution, this embodiment proposes a new SSB signal capture method based on the downlink synchronization block (SSB) frame structure proposed by the 5G new radio (NR) physical layer protocol for SSB detection and timing synchronization under low signal-to-noise ratio. When the method is implemented, Figure 2 As shown, the communication terminal (usually a receiver) captures the downlink signal, which specifically includes the following steps:
[0044] S101: performing a cross-correlation operation on the baseband received signal and the local primary synchronization signal; specifically, the receiver performs a PSS cross-correlation operation on the baseband received signal according to the following formula:
[0045]
[0046] Where n is the sampling point number, τ is the search time, s is the time domain main synchronization signal with the number id accessed locally, y is the baseband received signal, N is the length of the main synchronization signal, "*" indicates taking the complex conjugate, "." indicates complex multiplication, R CCR,s,id (τ) represents the cross-correlation result between the local sequence of the id number and the baseband received signal y at the τth time, s 本地,id (n) * The complex conjugate of the local sequence of id numbers.
[0047] S102: comparing the peak values of the main synchronization signals with different sequence numbers in the cross-correlation operation according to the preset constraint conditions; specifically, a ratio condition may be set for the relationship between the peak values of the cross-correlation operation of the main synchronization signals with different sequence numbers, that is, judging whether the peak value obtained by the peak search after the cross-correlation operation satisfies the following ratio condition compared with the peak values related to the main synchronization signals with other sequence numbers:
[0048]
[0049] By designing the ratio condition, the PSS correlation peak of the target sequence number is significantly greater than the correlation peaks of other sequence numbers. This horizontal constraint can reduce the risk of false detection caused by noise after the received signal is normalized; where sum(peak) refers to the correlation peak of the main synchronization signal of the other sequence numbers; if the ratio condition is met, the corresponding main synchronization signal sequence number, time and the delay operation correlation result of the corresponding time are retained. Indicates sequence number N ID (2) The result of the cross-correlation operation between the local sequence of each id number and the received signal, sum represents the sum, and peak represents the peak value of the cross-correlation operation between the local sequence of each id number and the received signal.
[0050] S103: determining the peak values that do not meet the constraint conditions as pseudo peak values, and filtering out the pseudo peak values of the correlation operation from the received noise when the primary synchronization signal has not arrived.
[0051] In this embodiment, a stricter comparison is made on the peak values of PSS correlation operations of different sequence numbers, which can filter out the pseudo peak values of correlation operations when PSS has not arrived, thus reducing the risk of misjudgment of types. Further simulation verification shows that the capture accuracy of this embodiment is better than that of the existing solution when EsN0 is below -5dB, and tends to be error-free when it is -5dB or above.
[0052] In an optional implementation, after performing a cross-correlation operation on the primary synchronization signal in the baseband received signal, the following steps are further performed: searching for a cross-correlation operation peak, finding a maximum peak and a corresponding primary synchronization signal sequence number, specifically including sub-steps:
[0053] Perform cross-correlation peak search according to the following formula:
[0054]
[0055] Among them, N ID (2) is the master synchronization signal number corresponding to the maximum peak value, τ 起始 is the starting time of the main synchronization signal, argmax represents the parameter corresponding to the maximum value, R CCR,s,id (τ) represents the cross-correlation operation result between the local sequence of id number and the baseband received signal y at the τth time.
[0056] In another optional technical implementation scheme, mainly for 5G downlink synchronization under low signal-to-noise ratio, a cyclic prefix (CP) delay correlation algorithm is used in combination (it is worth noting that in some protocols, delay correlation can also be performed when a subframe has repeated signals) and a PSS cross-correlation algorithm are used to design an SSB capture method that can suppress the risk of misjudgment of the PSS sequence number and dynamically adjust the detection threshold. The capture accuracy of this embodiment method when the symbol energy-to-noise ratio (EsN0) is less than -5dB is better than the existing cross-correlation method, where correct capture means successfully knowing the arrival of the PSS, obtaining the correct PSS sequence number, and achieving timing synchronization. Compared with the existing cross-correlation algorithm, this method can achieve better performance when serving application requirements such as direct connection of mobile phones to satellites and communications in harsh environments. Specifically, on the basis of the above-mentioned embodiment scheme, the receiver also performs CP delay correlation operations on the baseband received signal:
[0057]
[0058] Among them, N CP is the length of CP, N after CP and N CP The length of the signal is the same, R ACR,s (τ) represents the CP delay correlation calculation result of the received signal at the τth time.
[0059] Determine whether the peak value obtained by the peak search after the cross-correlation operation meets the following ratio conditions compared with the peak values related to the main synchronization signals of other numbers:
[0060]
[0061] Wherein, sum(peak) refers to the peak value of the main synchronization signal of the remaining sequence numbers; if the ratio condition is met, the corresponding main synchronization signal sequence number, time and the delay calculation related results of the corresponding time are retained, Indicates sequence number N ID (2) The result of the cross-correlation operation between the local sequence of each id number and the received signal, sum represents the sum, and peak represents the peak value of the cross-correlation operation between the local sequence of each id number and the received signal.
[0062] The detection threshold is generated based on the CP delay correlation operation, and the cross-correlation operation peak that passes the ratio condition is judged:
[0063]
[0064] Where T is a fixed threshold, which is a dynamic threshold formed by the CP delay correlation operation; E s is the energy of the determined primary synchronization signal, E CP It is the energy of the CP corresponding to the main synchronization signal to be judged; if the judgment is passed, the retained main synchronization signal sequence number and starting time are output to complete the signal capture; if the judgment is not passed, the detection continues.
[0065] In this embodiment, the cross-correlation and delay correlation are used in combination, the signal-to-noise ratio is sensed using CP delay correlation detection, and the cross-correlation detection threshold is dynamically adjusted, which can reduce the risk of missed detection caused by peak reduction. Specifically, mainly for 5G downlink synchronization under low signal-to-noise ratio, the cyclic prefix (CP) delay correlation algorithm and the PSS cross-correlation algorithm are used in combination, and an SSB capture method is designed that can suppress the risk of PSS sequence number misjudgment and dynamically adjust the detection threshold. The capture accuracy of this embodiment method when the symbol energy-to-noise ratio (EsN0) is less than -5dB is better than the existing cross-correlation method, where correct capture means successfully knowing the arrival of the PSS, obtaining the correct PSS sequence number, and achieving timing synchronization. Compared with the existing cross-correlation algorithm, this method can achieve better performance when serving application requirements such as direct mobile phone satellite connection and communication in harsh environments.
[0066] In another optional technical implementation scheme, a SSB capture method under low signal-to-noise ratio is provided. Considering that the CP of PSS and the tail end of PSS are repetitive, the CP delay correlation operation should be close to the energy of CP under high signal-to-noise ratio, while under low signal-to-noise ratio, since the operation result contains the square term of noise, the CP autocorrelation deteriorates seriously. Therefore, the embodiment method uses the CP delay correlation operation to perceive the change of signal-to-noise ratio and dynamically adjusts the cross-correlation detection threshold. In addition, the embodiment method also sets constraints on the relationship between the cross-correlation operation peak and the PSS operation peak of other groups.
[0067] In order to more clearly describe the method steps in the technical solution of this application, the following are given: Figure 3 In the implementation scheme shown, the receiving sliding window updates the received data every cycle, and performs cross-correlation operation, CP delay correlation operation and signal energy calculation. When the cycle timing reaches the specified search range, the cross-correlation operation peak is compared, and it is determined whether the ratio of the peak to the PSS correlation peak of other sequence numbers meets the ratio condition, and then a threshold is generated based on the CP delay correlation operation and a judgment is made. If the judgment is passed, the PSS sequence number, start time and success indication are output; if the judgment is not passed, the detection continues. Further specific implementation steps are as follows:
[0068] Step 1, receiving window updates;
[0069] Step 2, the receiving window performs cross-correlation operations with three groups of local time domain PSSs respectively, and calculates CP delay correlation operations and window energy calculations;
[0070] Step 3, each PSS correlation operation updates the maximum value respectively, and records the corresponding time, CP delay correlation operation and window energy calculation;
[0071] Step 4: When the number of receiving window sliding times counted by the cyclic timing reaches the search range, compare the PSS correlation operation peaks of different sequence numbers, and record the corresponding time, PSS sequence number, CP delay correlation operation and window energy;
[0072] Step 5, determining whether the ratio of the peak value to the PSS correlation operation peak values of other sequence numbers meets the ratio condition;
[0073] Step 6: Generate a threshold based on the CP delay correlation operation result, and compare it with the normalized cross-correlation operation peak value to form a final decision.
[0074] The above scheme is implemented in SSB capture, and a PSS detection and timing synchronization method combining cross-correlation and delay correlation is actually designed, which enhances the horizontal comparison of PSS correlation peaks with different sequence numbers, so as to cope with the problem of unclear peaks in the existing cross-correlation algorithm under low signal-to-noise ratio. Compared with some existing SSB capture technologies or PSS detection and timing synchronization technologies, the technical solution of this embodiment can adapt to communication environments with lower signal-to-noise ratios, and is closer to the needs of long-distance low-power applications such as mobile phones directly connected to satellites.
[0075] Furthermore, the comparison results of the capture accuracy of this solution and the prior art solution under different EsN0 under the AWGN channel obtained by simulation are provided. The simulation adopts SSB of mode D, and CP adopts extended mode. 10,000 Monte Carlo experiments are performed under each EsN0. Correct capture is defined as the receiver successfully knowing the arrival of PSS, obtaining the correct PSS sequence number and achieving timing synchronization. Figure 4The dotted line is the performance of the existing solution, and the solid line is the performance of the solution of this embodiment. When EsN0 is below -5dB, the solution of this embodiment is significantly better than the existing solution, and can still maintain an accuracy rate of more than 95% at -7dB; when EsN0 is not less than -5dB, both this solution and the existing solution tend to be error-free. Therefore, the solution of this embodiment has achieved performance improvement over the existing solution at a low signal-to-noise ratio.
[0076] In other embodiments of the present application, an electronic device is further provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein:
[0077] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform any of the above-mentioned methods.
[0078] It should be noted that the processor in the present application may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor can be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. The processor may also include an AI (Artificial Intelligence) processor, which is used to process related downlink capture operations so that the downlink signal capture model can be trained and learned autonomously to improve efficiency and accuracy.
[0079] In other embodiments of the present application, a computer-readable storage medium is also provided. When the computer program in the computer-readable storage medium is executed by the processor of the electronic device, the electronic device can perform the method as described above. The computer-readable storage medium may be non-transitory. The memory may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction, and the at least one instruction is used to be executed by the processor to implement the signal capture method provided in the method embodiment of the present application.
[0080] In other embodiments of the present application, a chip is provided, including a processor, the processor is connected to a memory, and is used to execute a computer program or instruction stored in the memory, so that the chip implements the above method. The chip can be a terminal baseband chip, etc.
[0081] It should be noted that within the scope of protection defined in the claims of the present invention, other implementations can be combined and / or expanded, replaced in any logical way from the above specific implementations, such as disclosed technical principles, disclosed technical features or implicitly disclosed technical features. For example, the embodiment method of the present application provides a PSS detection and timing synchronization method combining mutual correlation and delay correlation. In addition to being applicable to terminal baseband chips, it can also be applied to software radio, host computers and other products. Its performance under low signal-to-noise ratio is better than that of the mutual correlation algorithm, and it is compatible with 5G NR downlink synchronization in different communication scenarios.
Claims
1. A signal capture method, characterized in that: Includes steps: Performing cross-correlation operation on the baseband received signal and the local master synchronization signal; Comparing the peak values of the main synchronization signals of different sequence numbers in the cross-correlation operation according to the preset constraint conditions; Peaks that do not meet the constraint conditions are determined to be pseudo peaks, and the pseudo peaks of the correlation operation are screened out.
2. The signal acquisition method according to claim 1, characterized in that: Also includes the steps: Performing a delayed correlation operation on a cyclic prefix of a primary synchronization signal in a baseband received signal; The delayed correlation operation is used to sense changes in the signal-to-noise ratio, and the detection threshold of the cross-correlation operation is dynamically adjusted according to the sensed changes in the signal-to-noise ratio.
3. The signal acquisition method according to claim 1, characterized in that: The constraint condition is specifically set according to the relationship between the cross-correlation operation peaks of primary synchronization signals with different sequence numbers.
4. The signal acquisition method according to claim 3, characterized in that: After performing the cross-correlation operation on the primary synchronization signal in the baseband received signal, the method further includes the steps of searching for the cross-correlation operation peak value, finding the maximum peak value and the corresponding primary synchronization signal sequence number.
5. The signal acquisition method according to claim 4, characterized in that: The comparing of the peak values of main synchronization signals of different sequence numbers in the mutual correlation operation according to the preset constraint conditions specifically includes: judging whether the maximum peak value satisfies the ratio condition compared with the peak value related to the main synchronization signal sequence number according to the preset ratio condition, and the ratio condition is used to make the peak value related to the main synchronization signal of the target sequence number greater than the peak values related to other sequence numbers.
6. The signal acquisition method according to claim 2, characterized in that: The delayed correlation operation is used to sense the change of the signal-to-noise ratio, and the detection threshold of the cross-correlation operation is dynamically adjusted according to the sensed change of the signal-to-noise ratio, specifically including the sub-steps of: A threshold is generated based on the delay correlation operation and a judgment is made. If the judgment is passed, the main synchronization signal sequence number, the start time and the success indication are output; if the judgment is not passed, the detection continues.
7. A communication terminal, characterized in that: include: A first calculation module, used for performing a cross-correlation operation on a baseband received signal and a local primary synchronization signal; A comparison module, used for comparing the peak values of main synchronization signals with different sequence numbers of the cross-correlation operation according to preset constraints; A judgment module, used for judging a peak value that does not meet the constraint condition as a pseudo peak value; The screening module is used to screen out the pseudo peak value of the correlation operation.
8. An electronic device, characterized in that: include: at least one processor, and a memory communicatively connected to the at least one processor, wherein: The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the method according to any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that: When the computer program in the computer-readable storage medium is executed by a processor of an electronic device, the electronic device can perform the method according to any one of claims 1 to 6.
10. A chip, characterized in that: The chip comprises a processor connected to a memory and configured to execute a computer program or instruction stored in the memory, so that the chip implements the method according to any one of claims 1 to 6.