CN116156616A

CN116156616A - Method, device, equipment and medium for RFID synchronous search

Info

Publication number: CN116156616A
Application number: CN202310034578.8A
Authority: CN
Inventors: 张维; 计合森; 刘重军
Original assignee: Comba Network Systems Co Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-05-23

Abstract

The embodiment of the disclosure relates to a method, a device, equipment and a medium for RFID synchronous searching, wherein the method comprises the following steps: determining the sampling frequency of a current synchronous sequence; processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of a current synchronous sequence, and determining a current timing position of the current synchronous sequence; and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position. By adopting the technical scheme, the problem that the frequency deviation of the synchronous sequence cannot be tracked in real time is solved, the sampling frequency of the current synchronous sequence is determined, the sampling frequency is processed to finish the fine timing of the current synchronous sequence, the timing position of the synchronous sequence is adjusted, and the timing precision of the synchronization is improved.

Description

Method, device, equipment and medium for RFID synchronous search

Technical Field

The disclosure relates to the technical field of wireless communication, and in particular relates to a method, a device, equipment and a medium for RFID synchronous search.

Background

The RFID (Radio Frequency Identification ) technology is a non-contact automatic identification technology, which uses electromagnetic waves to perform wireless communication, so that an electronic tag is automatically identified by a reader-writer within a certain distance. Along with the continuous rapid development of the Internet of things, the rapid acquisition of the radio frequency identification technology has the advantages of real-time performance, convenience, high reading speed, high safety performance, standard identification and the like for information processing, meets the requirements of high-tech emerging technology and information standardization, and enables the RFID technology to be widely applied to industries such as logistics, manufacturing and public information service.

At present, when the tag and the reader communicate, the beginning of all commands must be started by the synchronous codes, so that the receiving end is ensured to obtain correct judgment and begin to receive data, and in the communication process from the tag to the reader, different synchronous codes are selected for adding according to different coding modes. Because the frequency offset precision and timing error of the note are larger, if a simple correlation synchronization or multipath correlation method is used, the sampling period of sampling points of the synchronous code sequence changes quite frequently, and when the sampling period is irregular, the sequence frequency offset jitter of the note cannot be tracked in real time.

Disclosure of Invention

To solve or at least partially solve the above technical problems, the present disclosure provides a method, apparatus, device, and medium for RFID synchronous search.

The embodiment of the disclosure provides a method for RFID synchronous searching, which comprises the following steps:

determining the sampling frequency of a current synchronous sequence;

processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of the current synchronous sequence, and determining a current timing position of the current synchronous sequence;

and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position.

The embodiment of the disclosure also provides a device for RFID synchronous search, which comprises:

a first determining module, configured to determine a sampling frequency of a current synchronization sequence;

the processing module is used for processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of the current synchronous sequence;

a second determining module, configured to determine a current timing position of the current synchronization sequence;

and the synchronization module is used for synchronously adjusting the current timing position when the current soft value sequence meets a preset target value.

The embodiment of the disclosure also provides an electronic device, which comprises: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement a method for RFID synchronous searching as provided by the embodiments of the present disclosure.

The disclosed embodiments also provide a computer-readable storage medium storing a computer program for performing the method for RFID synchronous search as provided by the disclosed embodiments.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: the scheme for RFID synchronous searching provided by the embodiment of the disclosure determines the sampling frequency of the current synchronous sequence; processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of a current synchronous sequence, and determining a current timing position of the current synchronous sequence; and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position. By adopting the technical scheme, the problem that the frequency deviation of the synchronous sequence cannot be tracked in real time is solved, the sampling frequency of the current synchronous sequence is determined, the sampling frequency is processed to finish the fine timing of the current synchronous sequence, the timing position of the synchronous sequence is adjusted, and the timing precision of the synchronization is improved.

Drawings

The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.

Fig. 1 is a flowchart of a method for RFID synchronous searching according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of another method for RFID synchronous searching provided by embodiments of the present disclosure;

FIG. 3 is a schematic diagram of fractional sample tracking sequence accumulation provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of distributed sample tracking sequence correlation computation provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a bit timing tracking accumulation sum provided by an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a reader-writer receiving a tag synchronization sequence according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of an overall synchronization flow provided by an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an apparatus for RFID synchronous searching according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

The names of messages or information interacted between the various devices in the embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

Fig. 1 is a flowchart of a method for RFID synchronous searching according to an embodiment of the present disclosure, where the method may be performed by an apparatus for RFID synchronous searching, and the apparatus may be implemented by using software and/or hardware, and may be generally integrated in an electronic device. As shown in fig. 1, the method includes:

step 101, determining the sampling frequency of the current synchronous sequence.

In practical application, when the tag and the reader communicate, the beginning of all commands must be started by a synchronization sequence, so that the receiving end is ensured to obtain correct judgment and begin to receive data, and in the communication process from the tag to the reader, different synchronization sequences are selected for adding according to different coding modes.

In the embodiment of the disclosure, the current synchronization sequence is determined according to the current coding mode, that is, different coding modes correspond to different current synchronization sequences. Wherein the coding modes are such as the coding modes of miller2, miller4, miller8 and the like.

In various ways of determining the sampling frequency of the current synchronization sequence in the embodiments of the present disclosure, in one embodiment, a sampling point distribution set corresponding to the current synchronization sequence is obtained, a plurality of soft value sequence sets corresponding to the sampling frequencies are obtained based on the sampling point distribution set calculation, sliding correlation calculation is performed on the soft value sequence set corresponding to each sampling frequency and the local synchronization sequence to obtain a maximum correlation value corresponding to each sampling frequency, a maximum correlation value set is obtained based on the maximum correlation value corresponding to each sampling frequency, and a sampling frequency corresponding to the maximum value is obtained from the maximum correlation value set as the sampling frequency of the current synchronization sequence.

In other embodiments, according to a preset directional scattering link frequency protocol and a preset calculation formula, a sampling point distribution set corresponding to the current synchronization sequence is obtained, a plurality of maximum correlation values of each sampling frequency are determined according to the sampling point distribution set, and the sampling frequency corresponding to the maximum correlation value is obtained as the sampling frequency of the current synchronization sequence. The above two ways are merely examples, and the present disclosure does not specifically limit the manner in which the sampling frequency of the current synchronization sequence is determined.

Step 102, processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of the current synchronous sequence, and determining a current timing position of the current synchronous sequence.

The direction scattering link frequency protocol of the tag gives a jitter range, and the timing range is determined according to the jitter range.

In the embodiment of the present disclosure, there are various ways of processing sampling frequencies based on a preset timing range to obtain a current soft value sequence of a current synchronization sequence, for example, determining a minimum timing value and a preset timing interval based on the timing range, determining a plurality of sampling points corresponding to the sampling frequencies based on the minimum timing value and the timing interval, performing an accumulation and operation to obtain a plurality of calculated values, and obtaining a maximum calculated value in the plurality of calculated values as the current soft value sequence of the current synchronization sequence; and then, for example, starting from the minimum timing value of the timing range, taking the number of points corresponding to the current sampling frequency, carrying out accumulation and operation, recording the corresponding accumulation and value, and taking the maximum value when the target number of sampling points are circularly accumulated together as the current soft value sequence of the current synchronous sequence. The above two ways are merely examples, and the present disclosure does not specifically limit the manner of processing the sampling frequency based on the preset timing range to obtain the current soft value sequence of the current synchronization sequence.

Further, a current timing position of the current synchronization sequence, i.e. a start position of the current synchronization sequence, is determined.

Step 103, when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position.

In the embodiment of the present disclosure, the target value is selected and set according to the application scenario, and when the current soft value sequence meets the preset target value, there are various ways of synchronously adjusting the current timing position, for example, when the current soft value sequence meets the preset target value, the current timing position is synchronously adjusted based on the maximum correlation value; and performing sliding correlation on the current synchronous sequence and the local synchronous sequence, wherein the sliding maximum correlation value is the initial value of the current synchronous sequence, and thus the synchronous adjustment is completed.

The scheme for RFID synchronous searching provided by the embodiment of the disclosure determines the sampling frequency of the current synchronous sequence; processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of a current synchronous sequence, and determining a current timing position of the current synchronous sequence; and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position. By adopting the technical scheme, the problem that the frequency deviation of the synchronous sequence cannot be tracked in real time is solved, the sampling frequency of the current synchronous sequence is determined, the sampling frequency is processed to finish the fine timing of the current synchronous sequence, the timing position of the synchronous sequence is adjusted, and the timing precision of the synchronization is improved.

Fig. 2 is a flowchart of another method for RFID synchronous searching according to an embodiment of the present disclosure, where the method for RFID synchronous searching is further optimized based on the above embodiment. As shown in fig. 2, the method includes:

step 201, determining a frequency difference maximum value based on a preset directional scattering link frequency protocol, obtaining a target sampling frequency with the directional scattering link frequency corresponding to a target value, and performing calculation processing on the frequency difference maximum value and the target sampling frequency based on a preset calculation formula to obtain a sampling point distribution set corresponding to a current synchronization sequence.

The direction scattering link frequency protocol corresponding to the tag is predetermined, and different direction scattering link frequency protocols correspond to different maximum frequency jitter ranges, for example, the direction scattering link frequency (BLF, backscatter Link Frequency) protocol of the tag gives a maximum frequency jitter range of ±22%. The maximum value of the frequency difference refers to the maximum value between the sampling frequency of 0 and the maximum jitter frequency, or the maximum value between the sampling frequency of 0 and the minimum jitter frequency, for example, the maximum jitter range of the maximum frequency is ±22%, and the maximum value of the frequency difference between the sampling frequency of 0 and the maximum jitter frequency of 22% is obtained.

The target value is selected and set according to the application scene, for example, when the target value is 0, the sampling frequency corresponding to the direction scattering link frequency of 0 is the target sampling frequency; the calculation formula may be set according to application scenario selection, for example, a calculation formula for sampling point distribution in MATLAB software, etc.

Specifically, in order to determine the sampling frequency of the current synchronization sequence, a sampling point distribution set of the current synchronization sequence may be calculated according to the target sampling frequency and the maximum frequency jitter range corresponding to the BLF.

As an example, the preset calculation formula is:

sampleum=floor ((1-frebasic). Oversamples): ceil ((1+frebasic). Oversamples), wherein oversamples are target sampling frequencies for which BLF corresponds to a target value of 0. Frebasic is the maximum of the frequency difference. Sampleum is a set of sampling points for different sampling frequencies corresponding to the current synchronization sequence.

Step 202, calculating based on a sampling point distribution set to obtain soft value sequence sets corresponding to a plurality of sampling frequencies, and performing sliding correlation calculation based on the soft value sequence set corresponding to each sampling frequency and a local synchronization sequence to obtain a maximum correlation value corresponding to each sampling frequency.

Step 203, obtaining a maximum correlation value set based on the maximum correlation value corresponding to each sampling frequency, and obtaining the sampling frequency corresponding to the maximum value from the maximum correlation value set as the sampling frequency of the current synchronous sequence.

Specifically, a soft value sequence set corresponding to the current synchronous sequence is calculated according to the sampling point distribution set of the current synchronous sequence. More specifically, for each sampling frequency, n synchronization sequences (n is a positive integer greater than 0) are calculated at a time as input values for the sliding correlation calculation. It should be noted that, the magnitude of the n value determines the frequency tracking force, and an excessive n value may cause untimely synchronization frequency tracking, and an excessively small n value may cause a relatively small correlation synchronization threshold, so that the magnitude of a specific n value needs to be evaluated and determined according to parameters such as the sampling frequency of the system, thereby improving the synchronization search precision.

Further, sliding correlation calculation is carried out on the obtained n synchronous sequences and n sequences in the local synchronous sequences, and a maximum correlation value set obtained by sliding correlation of all sampling frequencies is recorded. Wherein the local synchronization sequence is determined according to a directional scattering link frequency protocol.

Further, according to the maximum correlation value set of different sampling frequencies, the maximum value in the correlation value set is selected, the sampling frequency corresponding to the maximum value is used as the sampling frequency of the current synchronous sequence, that is, each sampling frequency is subjected to sliding correlation, then the maximum correlation value is taken, the maximum correlation value set of different sampling frequencies is obtained, and the frequency corresponding to the maximum correlation value is selected from the maximum correlation value set as the final sampling frequency of the current synchronous sequence.

And 204, determining a minimum timing value and a preset timing interval based on the timing range, and determining a plurality of sampling frequency corresponding sampling points based on the minimum timing value and the timing interval to perform accumulation and operation to obtain a plurality of calculated values.

Step 205, obtaining the maximum calculated value of the plurality of calculated values as the current soft value sequence of the current synchronous sequence, and determining the current timing position of the current synchronous sequence.

Specifically, after the sampling frequency of the current synchronization sequence is acquired, further tracking and timing of the current synchronization sequence is required. Wherein the timing range is + -m sampling points. Wherein, m is determined according to the maximum frequency jitter range, for example, the maximum frequency jitter range is + -22%, and the m is 6. The timing interval is preset according to the application scene.

Further, starting from the timing-m minimum timing value, the number of sampling points corresponding to the current sampling frequency is obtained for accumulation and operation according to a preset timing interval (for example, m is 2, the timing interval is 1, and the steps from-2 to-1 to 2 are sequentially performed), the corresponding accumulation and operation value is recorded as a calculated value, and therefore a plurality of calculated values can be obtained. Therefore, the circulating accumulation of 2m+1 sampling points can be completed, the maximum calculated value of 2m+1 timing addition values is selected as the current soft value sequence output of the current synchronous sequence, and the timing position is updated, namely the current timing position of the current synchronous sequence is determined.

And 206, synchronously adjusting the current timing position based on the maximum correlation value when the current soft value sequence meets a preset target value, and updating the starting position of the current synchronous sequence.

In an embodiment of the present disclosure, the target value is determined based on the encoding mode of the current synchronization sequence.

In an embodiment of the present disclosure, updating a start position of a current synchronization sequence includes: and if the maximum correlation value is smaller than the target correlation value, taking the sum of the maximum correlation value point and a preset value as the starting position of the current synchronous sequence.

Further, when the current soft value sequence is a target value, such as a Q value (the Q value may be determined according to different encoding modes, for example, Q value lengths corresponding to miller2/4/8 are 40/80/160, respectively), the current synchronization sequence is synchronized with the overall sequence once (that is, sliding correlation is performed between the current output sequence and the local synchronization sequence according to the current output sequence, and the maximum correlation value is taken), and the overall timing position is adjusted according to the maximum correlation value.

Further, in order to more accurately complete synchronization of the frame header of the synchronization sequence when updating the timing position, the embodiment of the disclosure may update the timing position by adopting multiple iterations and add a specific correlation operation result threshold, so as to increase synchronization accuracy, that is, the timing position is not necessarily opposite after the first sequence synchronization is completed, and the final output synchronization result is more accurate by repeating the above steps multiple times, so that accuracy for RFID synchronization search is further improved.

As an example of a scenario, the sampling frequency of the tag is 7.68mbp, the BLF is 320kHz, and the frequency maximum jitter deviation is 22% as determined from the BLF.

Specifically, a set of sampling point distributions is calculated:

floor (1-frebasic): oversamples): ceil ((1+frebasic): oversamples), wherein the oversamples value is 12 based on the sampling frequency and BLF. FreBasiRate is 22% of the maximum frequency difference. And according to the sampling frequency of 7.68Mbps of the receiver, BLF is calculated as 320kHz, and the calculated sampling point distribution set sampleum= [10, 11, 12, 13, 14, 15]. Where 7680/320/2=12, where the oversamples correspond to 1/2 original coded bits per point and are therefore divided by 2.

Wherein FreBasiRate is the maximum value of the frequency difference, and the sampling point distribution set sampleum= [10, 11, 12, 13, 14, 15] is obtained by calculating the calculation formula. Where the sampling point refers to the number of points corresponding to 1/2 code bits under the condition that the BLF is 320kHz, which corresponds to a sampling frequency of 7.68Mbps, or can be understood as the duration in the time domain.

Further, the sampling frequency calculated according to the frequency deviation in the current cycle sampling frequency (corresponding to [ -FreBasiRate, freBasiRate ]) is converted into a corresponding sampling point), and the sampling point number sampleum set [10, 11, 12, 13, 14, 15] corresponding to each bit calculates 4 synchronization sequences each time, and each synchronization sequence samples data (for example, 4 x sampleum (n) points are extracted each time, and the sampleum (n) points are added in turn, so as to obtain 4 soft value sequence data). Namely, a value corresponding to 4*1/2 bits is obtained each time, and the sampling point number corresponding to each obtained value is sampleum.

Taking sampleum=12 as an example, 48 sampling points are extracted, and one bit is obtained by adding every 12 sampling points, so as to obtain a total of 4 soft value sequence sets { bit0, bit1, bit2, bit3}. As shown in the accumulation schematic diagram of the frequency division sampling tracking sequence in FIG. 3, the 12 points 0-11 are added to obtain bit0, the 12 points 12-23 are added to obtain bit1, the 12 points 24-35 are added to obtain bit2 and the 12 points 36-47 are added to obtain bit3. Likewise, for the other several sampling frequencies sampleum, 10, 11, 13, 14, 15, corresponding sets of soft value sequences are obtained in the same manner.

Specifically, 4 soft value sequence sets { bit0, bit1, bit2, bit3} are acquired, sliding correlation calculation is performed on the soft value sequence sets and the local synchronization sequences, and the maximum correlation value corresponding to the current sampling frequency is recorded. Fig. 4 is a schematic diagram of a sample tracking sequence correlation calculation, and a process of obtaining a maximum correlation value after 4 sliding correlations is performed. Thus, the maximum correlation value sets { corr_max10, corr_max11, corr_max12, corr_max13, corr_max14, corr_max15} corresponding to the 6 sampling points can be obtained. And taking the sampling frequency corresponding to the maximum correlation value in the maximum correlation value set as the sampling frequency of the current 4 soft value sequence sets.

Further, in the sequence timing tracking process, after the current 4 soft value sequence sets are obtained, fine timing needs to be performed on each soft value sequence set, and the sampling frequency is taken as 12 for example, as shown in fig. 5, the timing range is as follows: -2, -1,0,1,2. For example, if the sampling point corresponding to the acquired sampling frequency is 12, then the value accumulated by the 12 sampling points is taken as the output value corresponding to the current 1/2 bit, and the sliding correlation calculation can be understood as that the current 12 sampling points are accumulated, not only the direct 1-12 sampling points are accumulated, but also the accumulation is performed after sliding left and right, specifically as shown in fig. 5, the maximum correlation value corresponding to the 5 timings of-2, -1,0,1,2 is selected according to the value of the sliding calculation, and the current timing position is output.

Specifically, starting from-2, performing accumulation and operation according to the sampling points corresponding to the sampling frequency obtained currently, and recording the corresponding accumulation and value. And 5 times of sampling point circulating accumulation is completed altogether, 5 timing summation value maximum correlation values are selected as soft value sequences of the current synchronous sequences to be output, and timing positions are updated.

Specifically, as shown in fig. 6, the reader-writer receives the tag synchronization sequence, each sampling point has a corresponding amplitude value, and before receiving the synchronization sequence, the receiver needs to perform a total synchronization operation of the synchronization sequence to synchronize the synchronization sequence. Specifically, when the length of the output current soft value sequence is Q value (the Q value can be determined according to different encoding modes), the synchronization sequence is synchronized once, the overall timing position is adjusted according to the maximum correlation value, and the starting position of the local synchronization sequence is updated.

The timing position is the start position of a point of the current synchronous sequence, and the purpose of updating the local sequence is to consider the first point as the start position of the current synchronous sequence when starting sliding, and the corresponding local sequence position needs to be correspondingly updated after the position of the first point is updated.

Specifically, after the adjustment of the current synchronization sequence is completed, the timing position is updated, so that in order to more accurately complete the synchronization of the current synchronization sequence, the embodiment of the disclosure may use a method of updating the timing position by multiple iterations, so as to increase the synchronization accuracy.

Specifically, the miller code is used as a column, and 11 x B/2 (b=2, 4, 8) groups are sequentially arranged in front of the column, and by using this feature, the loop is performed according to steps 201-206, and when the output total sequence length is Q value (the Q value may be determined according to different coding modes), the sliding correlation operation is performed on M local sequences, and the Q value needs to be greater than or equal to the acquired local sequence length M. If the timing position is 1, 11×B-M+1 maximum peaks can be obtained, and the maximum peak is the value length M of the local correlation sequence. Taking miller4 as an example, after coding, the data has 22 [1, -1] sequence groups and 44 sequences, 40 local sequences can be selected for correlation, and the timing position is judged according to the obtained maximum correlation value.

Specifically, as an example, the overall synchronization flow shown in fig. 7 is that firstly, according to the frequency division synchronization of step 1 and the timing tracking of step 2, step 3 obtains 60 sequence bits, then step 4 takes the 40-point synchronization sequence to check and slide with 60 sequences, and obtains the timing position Index. Step 5, judging whether the number of the maximum correlation values (the maximum correlation value is 40 and the number of the obtained synchronization points) is 5 (through 11 x 4-40+1). And 6, if the maximum correlation value is equal to 5, updating the positioning position, namely judging the first maximum correlation value point as the starting point of the synchronous sequence, marking the starting point as Index0, updating the synchronous sequence, and enabling the search sequence value corresponding to the Index0 to be the starting value of the output of the first sequence. Step 7, if the maximum value is not equal to 5, updating the local sequence position index=0, namely marking the maximum correlation value point as Index0, and updating the timing position, namely the starting position of the whole sequence is index_new=index 0-5; and updating the number of the local check bits to be 0, and starting searching at the Index, namely clearing the checked synchronization sequence, returning to frequency division synchronization again, and performing synchronization flow according to the new mark starting point Index 0.

According to the scheme for RFID synchronous searching, a sampling point distribution set corresponding to a current synchronous sequence is obtained, soft value sequence sets corresponding to a plurality of sampling frequencies are obtained based on the sampling point distribution set, sliding correlation calculation is conducted on the soft value sequence sets corresponding to each sampling frequency and a local synchronous sequence to obtain maximum correlation value sets corresponding to each sampling frequency, the sampling frequency corresponding to the maximum correlation value is obtained from all the maximum correlation value sets to serve as the sampling frequency of the current synchronous sequence, a minimum timing value and a preset timing interval are determined based on a timing range, accumulation and operation are conducted on the sampling points corresponding to the sampling frequencies are determined based on the minimum timing value and the timing interval to obtain a plurality of calculated values, the maximum calculated value in the plurality of calculated values is taken as the current soft value sequence of the current synchronous sequence, the current timing position of the current synchronous sequence is determined, when the current soft value sequence meets a preset target value, synchronous adjustment is conducted on the current timing position based on the maximum correlation value, and the initial position of the current synchronous sequence is updated. By adopting the technical scheme, the sampling frequency of the current synchronous sequence is determined through frequency division sampling point tracking; finishing the fine timing of the sequence through bit timing tracking; and the overall synchronous timing position of the sequence is tracked through the overall synchronous sequence, and the synchronous correlation condition is set, so that the synchronous timing precision is improved.

Fig. 8 is a schematic structural diagram of an apparatus for RFID synchronous searching according to an embodiment of the present disclosure, which may be implemented by software and/or hardware, and may be generally integrated in an electronic device.

As shown in fig. 8, the apparatus includes:

a first determining module 301, configured to determine a sampling frequency of a current preamble sequence;

a processing module 302, configured to process the sampling frequency based on a preset timing range, so as to obtain a current soft value sequence of the current synchronization sequence;

a second determining module 303, configured to determine a current timing position of the current synchronization sequence;

and the synchronization module 304 is configured to perform synchronization adjustment on the current timing position when the current soft value sequence meets a preset target value.

Optionally, the first determining module 301 includes:

the acquisition unit is used for acquiring a sampling point distribution set corresponding to the current synchronous sequence;

the first calculation unit is used for calculating based on the sampling point distribution set to obtain soft value sequence sets corresponding to a plurality of sampling frequencies;

the second calculation unit is used for carrying out sliding correlation calculation on the basis of the soft value sequence set corresponding to each sampling frequency and the local synchronous sequence to obtain a maximum correlation value corresponding to each sampling frequency;

And the processing unit is used for obtaining a maximum correlation value set based on the maximum correlation value corresponding to each sampling frequency, and acquiring the sampling frequency corresponding to the maximum value from the maximum correlation value set as the sampling frequency of the current synchronous sequence.

Optionally, the acquiring unit is specifically configured to:

determining a frequency difference maximum value based on a preset directional scattering link frequency protocol;

acquiring a target sampling frequency corresponding to the direction scattering link frequency as a target value;

and calculating the maximum frequency difference and the target sampling frequency based on a preset calculation formula to obtain a sampling point distribution set corresponding to the current synchronous sequence.

Optionally, the processing module 302 is specifically configured to:

determining a minimum timing value and a preset timing interval based on the timing range;

determining a plurality of sampling frequency corresponding sampling points based on the minimum timing value and the timing interval to perform accumulation and operation to obtain a plurality of calculated values;

and acquiring the maximum calculated value in the plurality of calculated values as a current soft value sequence of the current synchronous sequence.

Optionally, the synchronization module 304 is specifically configured to:

and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position based on the maximum correlation value.

Optionally, the apparatus further includes:

and a third determining module, configured to determine the target value based on a coding manner of the current synchronization sequence.

Optionally, the apparatus further includes:

and the updating module is used for updating the starting position of the current synchronous sequence.

Optionally, the updating module is specifically configured to:

if the maximum correlation value is equal to the target correlation value, taking a first maximum correlation value point as the starting position of the current synchronous sequence, and taking a search sequence value corresponding to the starting position as a starting value of first sequence output;

and if the maximum correlation value is smaller than the target correlation value, taking the sum of the maximum correlation value point and a preset value as the starting position of the current synchronous sequence.

The device for RFID synchronous searching provided by the embodiment of the disclosure can execute the method for RFID synchronous searching provided by any embodiment of the disclosure, and has the corresponding functional modules and beneficial effects of executing the method.

Embodiments of the present disclosure also provide a computer program product comprising computer programs/instructions which, when executed by a processor, implement the method for RFID synchronous searching provided by any of the embodiments of the present disclosure.

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. Referring now in particular to fig. 9, a schematic diagram of an electronic device 400 suitable for use in implementing embodiments of the present disclosure is shown. The electronic device 400 in the embodiments of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 9 is merely an example, and should not impose any limitations on the functionality and scope of use of embodiments of the present disclosure.

As shown in fig. 9, the electronic device 400 may include a processing means (e.g., a central processing unit, a graphics processor, etc.) 401, which may perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 402 or a program loaded from a storage means 408 into a Random Access Memory (RAM) 403. In the RAM403, various programs and data necessary for the operation of the electronic device 400 are also stored. The processing device 401, the ROM 402, and the RAM403 are connected to each other by a bus 404. An input/output (I/O) interface 405 is also connected to bus 404.

In general, the following devices may be connected to the I/O interface 405: input devices 406 including, for example, a touch screen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; an output device 407 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, and the like; storage 408 including, for example, magnetic tape, hard disk, etc.; and a communication device 409. The communication means 409 may allow the electronic device 400 to communicate with other devices wirelessly or by wire to exchange data. While fig. 9 shows an electronic device 400 having various means, it is to be understood that not all of the illustrated means are required to be implemented or provided. More or fewer devices may be implemented or provided instead.

In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a non-transitory computer readable medium, the computer program comprising program code for performing the method shown in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via communications device 409, or from storage 408, or from ROM 402. When executed by the processing means 401, performs the above-described functions defined in the method for RFID synchronous search of the embodiments of the present disclosure.

It should be noted that the computer readable medium described in the present disclosure may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.

In some implementations, the clients, servers may communicate using any currently known or future developed network protocol, such as HTTP (Hyper Text Transfer Protocol ), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the internet (e.g., the internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.

The computer readable medium may be contained in the electronic device; or may exist alone without being incorporated into the electronic device.

The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: determining the sampling frequency of a current synchronous sequence; processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of a current synchronous sequence, and determining a current timing position of the current synchronous sequence; and when the current soft value sequence meets a preset target value, synchronously adjusting the current timing position.

Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including, but not limited to, an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units involved in the embodiments of the present disclosure may be implemented by means of software, or may be implemented by means of hardware. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.

The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

According to one or more embodiments of the present disclosure, the present disclosure provides an electronic device comprising:

a processor;

a memory for storing the processor-executable instructions;

the processor is configured to read the executable instructions from the memory and execute the instructions to implement any of the methods for RFID synchronous searching as provided in the present disclosure.

According to one or more embodiments of the present disclosure, the present disclosure provides a computer-readable storage medium storing a computer program for performing a method for RFID synchronous search as any one of the present disclosure provides.

The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in this disclosure is not limited to the specific combinations of features described above, but also covers other embodiments which may be formed by any combination of features described above or equivalents thereof without departing from the spirit of the disclosure. Such as those described above, are mutually substituted with the technical features having similar functions disclosed in the present disclosure (but not limited thereto).

Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

Claims

1. A method for RFID synchronous searching, comprising:

determining the sampling frequency of a current synchronous sequence;

2. The method for RFID synchronous searching according to claim 1, wherein the determining the sampling frequency of the current synchronization sequence comprises:

acquiring a sampling point distribution set corresponding to the current synchronous sequence;

calculating based on the sampling point distribution set to obtain soft value sequence sets corresponding to a plurality of sampling frequencies;

performing sliding correlation calculation based on the soft value sequence set corresponding to each sampling frequency and the local synchronous sequence to obtain a maximum correlation value corresponding to each sampling frequency;

and obtaining a maximum correlation value set based on the maximum correlation value corresponding to each sampling frequency, and obtaining the sampling frequency corresponding to the maximum value from the maximum correlation value set as the sampling frequency of the current synchronous sequence.

3. The method for RFID synchronous searching according to claim 2, wherein the obtaining the sampling point distribution set corresponding to the current synchronization sequence includes:

4. The method for RFID synchronous searching according to claim 1, wherein the processing the sampling frequency based on a preset timing range to obtain a current soft value sequence of the current synchronization sequence comprises:

5. The method for RFID synchronous searching according to claim 2, wherein the performing the synchronous adjustment of the current timing position when the current soft value sequence satisfies a preset target value includes:

6. The method for RFID synchronous searching of claim 5, further comprising:

and determining the target value based on the coding mode of the current synchronous sequence.

7. The method for RFID synchronous searching of claim 6, further comprising:

if the maximum correlation value is equal to the target correlation value, taking the first maximum correlation value point as the starting position of the current synchronous sequence, and taking the search sequence value corresponding to the starting position as the starting value of the first sequence output;

8. An apparatus for RFID synchronous searching, comprising:

9. An electronic device, the electronic device comprising:

a processor;

a memory for storing the processor-executable instructions;

the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method for RFID synchronous searching according to any of the preceding claims 1-7.

10. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method for RFID synchronous search according to any of the preceding claims 1-7.