CN111245558B - Decoding method, device and equipment for FM0 code and readable storage medium - Google Patents

Decoding method, device and equipment for FM0 code and readable storage medium Download PDF

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CN111245558B
CN111245558B CN201811441700.9A CN201811441700A CN111245558B CN 111245558 B CN111245558 B CN 111245558B CN 201811441700 A CN201811441700 A CN 201811441700A CN 111245558 B CN111245558 B CN 111245558B
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value
probability
target pulse
target
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CN111245558A (en
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桂杰
崔海群
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Beijing Juli Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits
    • H03M5/02—Conversion to or from representation by pulses
    • H03M5/04—Conversion to or from representation by pulses the pulses having two levels
    • H03M5/06—Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell
    • H03M5/12—Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code

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Abstract

The embodiment of the invention provides a decoding method, a device and equipment of FM0 codes and a readable storage medium. According to the method, each single pulse in the data to be decoded is sequentially used as a target pulse, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at this time, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values that the value of the bit corresponding to the target pulse is '1' and '0' are calculated; and the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.

Description

Decoding method, device and equipment for FM0 code and readable storage medium
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a decoding method, a device, equipment and a readable storage medium for FM0 codes.
Background
Electronic Toll Collection (ETC) adopts special short-range communication technology, establishes wireless communication link before on-board unit (OBU) and Road Side Unit (RSU), carries out identification authentication and consumption deduction through wireless mode at the vehicle in-process of traveling, realizes the Toll Collection that does not stop, has improved Toll station mouth passage capacity greatly.
At present, ETC is widely popularized all over the country, and in order to realize interconnection and intercommunication of ETC equipment, both RSU and OBU equipment must meet GB/T20851.2-2007 short-range communication special for electronic toll collection and No. 13 bulletin technical requirement for electronic toll collection on toll roads networking in 2011 of traffic department, which is called ETC standard for short. The ETC standard clearly specifies that the encoding mode of communication is FM0, the bit rate of an uplink is 512Kbps, and the bit clock precision is +/-100 x 10-6The downlink bit rate is 256Kbps and the bit clock accuracy is + -100 x 10-5。
The FM0 (i.e., Bi-Phase Space Coding) code is called double-Phase Space Coding, and its operation principle is to use level change to represent logic in a bit window. If the level is flipped from the beginning of the bit window, a logic '1' is represented. A logic '0' is indicated if the level, in addition to flipping at the beginning of the bit window, also flips in the middle of the bit window.
The current common method for decoding FM0 codes is: collecting the pulse width of the pulse, comparing the pulse width with a fixed threshold, for example, directly determining that the decoded data is a 0 when the pulse width is less than or equal to the duration corresponding to two consecutive half '0'; when the pulse width is greater than or equal to the duration corresponding to two continuous '1', directly determining that the decoded data are two 1 s; however, when the pulse width is not less than or equal to the duration corresponding to two consecutive half '0's, but not greater than or equal to the duration corresponding to two consecutive '1's, the decoding data cannot be directly determined according to the pulse width, but determined according to the number of times the pulse width appears in the fixed threshold space, and the decoding accuracy is poor.
Disclosure of Invention
The embodiment of the invention provides a decoding method, a device, equipment and a readable storage medium of FM0 codes, which are used for solving the problem of poor decoding accuracy caused by the fact that decoding data are determined according to the times of pulse widths appearing in a fixed threshold space under the condition that the decoding data cannot be directly determined according to the pulse widths in the prior art.
One aspect of the embodiments of the present invention is to provide a decoding method for FM0 encoding, including:
sequentially taking each single pulse in the data to be decoded as a target pulse to obtain the pulse width of the target pulse;
determining whether the pulse width of the target pulse is within an error range of a first threshold or a second threshold;
if the pulse width of the target pulse is not in the error range of the first threshold and the second threshold, calculating the comprehensive probability value of the bit corresponding to the target pulse as '1' and '0' according to the pulse width of the target pulse and the adjacent pulses of the target pulse;
and taking the value with the large comprehensive probability value as the value of the bit corresponding to the target pulse.
Another aspect of the embodiments of the present invention is to provide an FM0 encoding decoding apparatus, including:
the acquisition module is used for sequentially taking each single pulse in the data to be decoded as a target pulse and acquiring the pulse width of the target pulse;
a decoding module, configured to determine whether a pulse width of the target pulse is within an error range of a first threshold or a second threshold;
the decoding module is further configured to calculate, according to the pulse widths of the target pulse and its neighboring pulses, integrated probability values that the bit values corresponding to the target pulse are '1' and '0', if the pulse width of the target pulse is not within an error range of a first threshold and a second threshold;
and the decoding module is also used for taking the value with the large comprehensive probability value as the value of the bit corresponding to the target pulse.
Another aspect of the embodiments of the present invention is to provide an FM0 encoding decoding apparatus, including:
a memory, a processor, and a computer program stored on the memory and executable on the processor,
the processor, when running the computer program, implements the method described above.
It is another aspect of an embodiment of the present invention to provide a computer-readable storage medium, storing a computer program,
which when executed by a processor implements the method described above.
According to the decoding method, the decoding device, the decoding equipment and the readable storage medium of the FM0 code, which are provided by the embodiment of the invention, the pulse width of a target pulse is obtained by taking each single pulse in data to be decoded as the target pulse in sequence; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at this time, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values that the value of the bit corresponding to the target pulse is '1' and '0' are calculated; and the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
Drawings
Fig. 1 is a flowchart of a decoding method for FM0 encoding according to an embodiment of the present invention;
fig. 2 is a flowchart of a decoding method of FM0 encoding according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of probability tables according to a second embodiment of the present invention;
FIG. 4 is a diagram illustrating FM0 encoded data according to a second embodiment of the present invention;
FIG. 5 is a diagram illustrating another FM0 encoded data according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an FM0 encoding decoding apparatus according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of an FM0 encoding decoding device according to a fifth embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of embodiments of the invention, as detailed in the following claims.
First, terms related to embodiments of the present invention are explained:
pulse width of pulse: refers to the duration of the pulse period. At present, the time length of each pulse period in FM0 encoded data is collected by counting with a timer, which specifically includes: collecting the count value of the timer once per jumping edge, and storing the count value in a corresponding register; and then subtracting the last count value from the current count value to obtain the duration of the current period.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the following examples, "plurality" means two or more unless specifically limited otherwise.
The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Example one
Fig. 1 is a flowchart of a decoding method for FM0 encoding according to an embodiment of the present invention. The embodiment of the invention provides a decoding method of FM0 codes, aiming at the problem that in the prior art, decoding accuracy is poor when decoding data is determined according to the frequency of occurrence of pulse width in a fixed threshold space. As shown in fig. 1, the method comprises the following specific steps:
and S101, sequentially taking each single pulse in the data to be decoded as a target pulse, and acquiring the pulse width of the target pulse.
In the process of decoding the FM0 code, the waveform of collecting FM0 coded data is captured and input through a timer to obtain the data to be decoded, only when the jumping edge of the waveform of collecting FM0 coded data occurs, the data to be decoded is obtained, and the decoded data is stored in a buffer.
And step S102, determining whether the pulse width of the target pulse is within the error range of the first threshold or the second threshold.
The FM0 uplink has a bit rate of 512Kbps and a sampling clock of 10.24M, so ideally, when a bit value element corresponding to a pulse is '1', the pulse width of the single pulse is '20'; when the value of a bit corresponding to one pulse is '0', the pulse width of the single pulse is '10'; when the bit value corresponding to two adjacent pulses is '11', the pulse width of the double pulse is '40', when the bit value corresponding to two adjacent pulses is '10' or '01', the pulse width of the double pulse is '30', and when the bit value corresponding to two adjacent pulses is '00', the pulse width of the double pulse is '20'; when three adjacent pulses correspond to a bit value: when all the pulse width is '1', the pulse width of the three pulses is '60'; when there are two '1's, the three-pulse width is "50", when there are two '0's, the three-pulse width is "40", and when all of the '0's, the three-pulse width is "30".
In practical cases, the pulse width may not be an integer multiple of 10 each time, and there may be some errors, and the preset error in this embodiment represents a preset acceptable error.
The value of the preset error may be set by a technician according to practical experience, for example, the preset error may be 2, and the embodiment is not limited in detail here.
In this embodiment, the first threshold is a single pulse width with a value element of '1' corresponding to a bit, and an error range of the first threshold may be [ first threshold-preset error, first threshold + preset error ].
For example, if the first threshold is 20 and the preset error is 2, the error range of the first threshold is [18, 22 ]; the second threshold is 10, the preset error is 2, and the error range of the second threshold is [8,12 ].
Determining whether the pulse width of the target pulse is within an error range of a first threshold or a second threshold; if the pulse width of the target pulse is within the error range of the first threshold, the value of the bit corresponding to the target pulse can be directly determined to be '1'; and if the pulse width of the target pulse is within the error range of the second threshold value, determining that the value of the bit corresponding to the target pulse is '0'.
If it is determined that the pulse width of the target pulse is not within the error range of the first threshold value or within the error range of the second threshold value, the value of the bit corresponding to the target pulse cannot be directly determined according to the pulse width of the target pulse, and steps S103-S104 are performed.
Step S103, if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, calculating the comprehensive probability value that the value of the bit corresponding to the target pulse is '1' and '0' according to the pulse width of the target pulse and the adjacent pulses of the target pulse.
In this embodiment, if it is determined that the pulse width of the target pulse is not within the error range of the first threshold or within the error range of the second threshold, and under the condition that the value of the bit corresponding to the target pulse cannot be directly determined according to the pulse width of the target pulse, the pulse widths of a plurality of adjacent pulses of the target pulse are obtained, and the comprehensive probability that the value of the bit corresponding to the target pulse is '1' and '0' is comprehensively calculated.
For example, the comprehensive probability that the bit values of the target pulse are '1' and '0' may be comprehensively calculated according to the pulse widths of two adjacent pulses of the target pulse; or, the comprehensive probability that the bit values corresponding to the target pulse are '1' and '0' may be comprehensively calculated according to the pulse widths of four adjacent pulses of the target pulse (i.e., two pulses before and two pulses after the target pulse); in this embodiment, the number of adjacent pulses of the target pulse according to which the value of the bit corresponding to the target pulse is the integrated probability value of '1' and '0' is calculated is not specifically limited.
And step S104, taking the value with the large comprehensive probability value as the value of the bit corresponding to the target pulse.
After the comprehensive probability values of '1' and '0' of the bit values corresponding to the target pulse are obtained through calculation, the comprehensive probability value of '1' of the bit value corresponding to the target pulse is compared with the comprehensive probability value of '0' of the bit value corresponding to the target pulse.
According to the comparison result, if the integrated probability value of the bit corresponding to the target pulse, which is '1', is greater than the integrated probability value of '0', the bit corresponding to the target pulse is determined to be '1'.
According to the comparison result, if the integrated probability value of the bit corresponding to the target pulse, which is '1', is smaller than the integrated probability value of '0', the bit corresponding to the target pulse is determined to be '0'.
In the embodiment of the invention, each single pulse in the data to be decoded is taken as a target pulse in sequence, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at the moment, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values of the bit corresponding to the target pulse, namely '1' and '0', are calculated; the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
Example two
Fig. 2 is a flowchart of a decoding method of FM0 encoding according to a second embodiment of the present invention. Based on the first embodiment, in this embodiment, a practical implementation of the decoding method for FM0 encoding is described in detail, taking the example of integrating the pulse widths of the target pulse and its adjacent 4 pulses and calculating the integrated probability values of '1' and '0' of the corresponding bits of the target pulse. As shown in fig. 2, the method comprises the following specific steps:
step S201, sequentially using each single pulse in the data to be decoded as a target pulse, and obtaining a pulse width of the target pulse.
In the process of decoding the FM0 code, the waveform of collecting FM0 coded data is captured and input through a timer to obtain the data to be decoded, only when the jumping edge of the waveform of collecting FM0 coded data occurs, the data to be decoded is obtained, and the decoded data is stored in a buffer.
Step S202, judging whether the pulse width of the target pulse is within the error range of the first threshold value.
The FM0 uplink has a bit rate of 512Kbps and a sampling clock of 10.24M, so ideally, when a bit value element corresponding to a pulse is '1', the pulse width of a single pulse is '20'; when the value of a bit corresponding to one pulse is '0', the pulse width of the single pulse is '10'; when the bit value corresponding to two adjacent pulses is '11', the pulse width of the double pulse (i.e. the sum of the pulse widths of the two adjacent pulses) is '40', when the bit value corresponding to two adjacent pulses is '10' or '01', the pulse width of the double pulse is '30', and when the bit value corresponding to two adjacent pulses is '00', the pulse width of the double pulse is '20'; when three adjacent pulses correspond to a bit value: when all the pulse widths are '1', the pulse width of the three pulses (namely the sum of the pulse widths of the adjacent three pulses) is '60'; when there are two '1's, the three-pulse width is "50", when there are two '0's, the three-pulse width is "40", and when all of the '0's, the three-pulse width is "30".
In practical cases, the pulse width may not be an integer multiple of 10 each time, and there may be some errors, and the preset error in this embodiment represents a preset acceptable error.
The value of the preset error may be set by a technician according to practical experience, for example, the preset error may be 2, and the embodiment is not limited in detail here.
In this embodiment, the first threshold is a single pulse width with a value element of '1' corresponding to a bit, and an error range of the first threshold may be [ first threshold-preset error, first threshold + preset error ].
For example, if the first threshold is 20 and the preset error is 2, the error range of the first threshold is [18, 22 ].
In this step, if the pulse width of the target pulse is within the error range of the first threshold, step S203 is executed; if the pulse width of the target pulse is not within the error range of the first threshold, step S204 is executed.
In step S203, if it is determined that the pulse width of the target pulse is within the error range of the first threshold, the value of the bit corresponding to the target pulse may be directly determined to be '1'.
If the pulse width of the target pulse is determined to be within the error range of the first threshold, it is determined that the value of the bit corresponding to the target pulse is '1'.
And step S204, judging whether the pulse width of the target pulse is within the error range of the second threshold value.
In this embodiment, the second threshold is a single pulse width with a value element of '0' corresponding to the bit, and the error range of the second threshold may be [ second threshold-preset error, second threshold + preset error ].
For example, if the second threshold is 10 and the preset error is 2, the error range of the second threshold is [8,12 ].
In this step, if it is determined that the pulse width of the target pulse is within the error range of the second threshold, step S205 is performed; if it is determined that the pulse width of the target pulse is not within the error range of the second threshold, step S206 is performed.
Step S205, if it is determined that the pulse width of the target pulse is within the error range of the second threshold, determining that the value of the bit corresponding to the target pulse is '0'.
If the pulse width of the target pulse is determined to be within the error range of the second threshold, it is determined that the value of the bit corresponding to the target pulse is '0'.
And S206, calculating the comprehensive probability value of the bit corresponding to the target pulse as '1' and '0' according to the pulse width of the target pulse and the adjacent pulse.
If the pulse width of the target pulse is determined not to be within the error range of the first threshold value or the error range of the second threshold value, under the condition that the value of the bit corresponding to the target pulse cannot be directly determined according to the pulse width of the target pulse, the comprehensive probability that the value of the bit corresponding to the target pulse is '1' and '0' is comprehensively calculated by acquiring the pulse widths of a plurality of adjacent pulses of the target pulse.
For example, the comprehensive probability that the bit values of the target pulse are '1' and '0' may be comprehensively calculated according to the pulse widths of two adjacent pulses of the target pulse; or, the comprehensive probability that the bit values corresponding to the target pulse are '1' and '0' may be comprehensively calculated according to the pulse widths of four adjacent pulses of the target pulse (i.e., two pulses before and two pulses after the target pulse); in this embodiment, the number of adjacent pulses of the target pulse according to which the value of the bit corresponding to the target pulse is the integrated probability value of '1' and '0' is calculated is not specifically limited.
In this embodiment, the step may be specifically implemented as follows:
according to the pulse width of the target pulse and the pulse width of the previous pulse, calculating a first probability that the value of the bit corresponding to the target pulse is '1' and a second probability that the value of the bit corresponding to the target pulse is '0'; according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0'; according to the pulse widths of the target pulse and the first two pulses, calculating a fifth probability that the value of the bit corresponding to the target pulse is '1' and a sixth probability that the value of the bit corresponding to the target pulse is '0'; calculating a seventh probability that a bit value corresponding to the target pulse is '1' and an eighth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and two pulses adjacent to the target pulse; calculating a ninth probability that the value of the bit corresponding to the target pulse is '1' and a tenth probability that the value of the bit corresponding to the target pulse is '0' according to the pulse widths of the target pulse and the two pulses after the target pulse; calculating the first probability, the third probability and the fifth probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse; and calculating the second probability, the fourth probability and the sixth probability according to a preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
The preset operation rule may be summation or averaging, and the preset operation rule may be set by a technician according to experience, and this embodiment is not specifically limited herein.
Optionally, if the value of the bit corresponding to the target pulse cannot be determined according to the pulse width of the target pulse, it may be considered that the probabilities that the value of the bit corresponding to the target pulse that can be determined according to the pulse width of the target pulse is '1' and '0' are 50%, respectively. When the comprehensive probability value that the value of the bit corresponding to the target pulse is '1' and '0' is calculated, the probability that the value of the bit corresponding to the target pulse is '1' and '0' which can be determined according to the pulse width of the target pulse can be combined with the first probability, the second probability, the third probability, the fourth probability, the fifth probability and the sixth probability, and the comprehensive probability value that the value of the bit corresponding to the target pulse is '1' and '0' is calculated according to the preset operation rule.
In another embodiment of this embodiment, the comprehensive probability value that the bit value corresponding to the target pulse is '1' and '0' is calculated according to the pulse widths of the target pulse and its adjacent pulses, which can also be implemented as follows:
according to the pulse width of the target pulse and the pulse width of the previous pulse, calculating a first probability that the value of the bit corresponding to the target pulse is '1' and a second probability that the value of the bit corresponding to the target pulse is '0';
according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0';
calculating the first probability and the third probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse;
and calculating the second probability and the fourth probability according to a preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
Step S207, comparing the value of the bit corresponding to the target pulse with the value of the '1' comprehensive probability value and the value of the bit corresponding to the target pulse with the value of the '0' comprehensive probability value.
After the comprehensive probability values of '1' and '0' of the bit values corresponding to the target pulse are obtained through calculation, the comprehensive probability value of '1' of the bit value corresponding to the target pulse is compared with the comprehensive probability value of '0' of the bit value corresponding to the target pulse.
Step S208, if the integrated probability value of the bit corresponding to the target pulse, which is '1', is greater than the integrated probability value of '0', it is determined that the bit corresponding to the target pulse is '1'.
Step S209, if the integrated probability value of the bit corresponding to the target pulse, which is '1', is smaller than the integrated probability value of '0', then it is determined that the bit corresponding to the target pulse is '0'.
For example, FM0 uplink has a bit rate of 512Kbps and a sampling clock of 10.24M, so ideally, when a bit value element corresponding to a pulse is '1', the pulse width of the single pulse is '20'; when the value of a bit corresponding to one pulse is '0', the pulse width of the single pulse is '10'; when the bit value corresponding to two adjacent pulses is '11', the pulse width of the double pulse (i.e. the sum of the pulse widths of the two adjacent pulses) is '40', when the bit value corresponding to two adjacent pulses is '10' or '01', the pulse width of the double pulse is '30', and when the bit value corresponding to two adjacent pulses is '00', the pulse width of the double pulse is '20'; when three adjacent pulses correspond to a bit value: when all the pulse widths are '1', the pulse width of the three pulses (namely the sum of the pulse widths of the adjacent three pulses) is '60'; when there are two '1's, the three-pulse width is "50", when there are two '0's, the three-pulse width is "40", and when all of the '0's, the three-pulse width is "30".
Taking the preset error as 2 as an example, in the process of calculating the comprehensive probability value that the value of the bit corresponding to the target pulse is '1' and '0', the probability of the value of the pulse width of the single pulse and the value of the bit corresponding to the single pulse being, the probability of the value of the pulse width of the double pulse and the value of the bit corresponding to the two pulses, and the probability of the value of the pulse width of the three pulses and the value of the bit corresponding to the three pulses are shown in fig. 3.
For a single pulse as in fig. 3, the error range of the first threshold is [22,18], and the error range of the second threshold is [12,8 ]; if the pulse width of the single pulse is within [22,18], determining the value of the bit corresponding to the single pulse as '1'; if the pulse width of a single pulse is within [12,8], the value of the bit corresponding to the single pulse is determined to be '0'. If the pulse width of a single pulse is within [17,13], the bit value corresponding to the single pulse is only '0' or '1', and the probabilities that the bit value corresponding to the single pulse is '0' or '1' are independent, the probabilities that the bit value corresponding to the single pulse is '0' or '1' are each 50%.
The last double pulse, i.e. the target pulse and its following pulse, as in fig. 3: when the bit value of two adjacent pulses is '11', the pulse width of the double pulse (i.e. the sum of the pulse widths of two adjacent pulses) is '40', when the bit value of two adjacent pulses is '10' or '01', the pulse width of the double pulse is '30', and when the bit value of two adjacent pulses is '00', the pulse width of the double pulse is '20'.
Since the preset error is 2, when the pulse width of the following double pulse is within [42,38], the values of the bits corresponding to the two pulses can be determined to be '11' within the error range of '40', and thus the values of the bits corresponding to the target pulse and the following pulse are '1'.
When the pulse width of the last double pulse is within [32,28], the values of the bits corresponding to the two pulses are '10' or '01' within the error range of '30', and since the value of the bit corresponding to the last pulse is unknown, the probability that the values of the bits corresponding to the target pulse are '1' and '0' is 50%.
When the pulse width of the last double pulse is within [22,18], the bit values corresponding to the two pulses can be determined to be '00' within the error range of '20', and thus the bit values corresponding to the target pulse and the next pulse are '0'.
When the pulse width of the last double pulse is within [37,33], between [42,38] and [32,28], the bit values corresponding to the two pulses may be '11' or '10', or two probability combinations of '11' or '01'; in either case, the probability of the target pulse corresponding to a bit having a value of '1' and '0' is 75% and 25%, respectively.
Similarly, data in the probability table of fig. 3 can be derived.
Specifically, based on the data shown in fig. 3, taking the FM0 encoded data in fig. 4 as an example, the following describes the calculation of the integrated probability values of '1' and '0' of the bit corresponding to the target pulse according to the pulse widths of the target pulse and its four adjacent pulses:
as shown in fig. 4, the pulse widths of five single pulses in the encoded data are represented by S1, S2, S3, S4 and S5, respectively, and the bandwidth of each single pulse is: 8 for S1, 12 for S2, 17 for S3, 13 for S4, 10 for S5; the preset error is 2, the first threshold is 20, and the second threshold is 10.
Taking the first pulse as the target pulse: s1 ═ 8, and in [8,12], it may be determined that the pulse width of the current target pulse is '0' in the value where the bit corresponding to the first pulse may be determined.
The second pulse is taken as the target pulse: s2 is 12, and in [8,12], the bit value corresponding to the current target pulse may be determined to be '0'.
The third pulse is taken as the target pulse: if S3 is 17, and is not in [8,12], it cannot be determined whether the bit value corresponding to the target pulse is '1' or '0' by the pulse width of the target pulse, and at this time, the integrated probability value of the bit value corresponding to the target pulse being '1' and '0' may be calculated:
the probability values that the values of the bits corresponding to the target pulse determined by the single pulse width of the target pulse are '1' and '0' are 50%, respectively.
Pulse width D of the first double pulse (target pulse and its preceding pulse) of the target pulse (third pulse S3)Front sideSince the second pulse has been determined to be '0', the probability table shown in fig. 3 can be found to have probabilities of the target pulse corresponding to bit values of '1' and '0' being 100% and 0%, respectively, as S2+ S3 being 29.
Pulse width D of the last double pulse (target pulse and the next pulse) of the target pulse (third pulse S3)Rear endAs the bits of S4 are not yet judged, it is not known whether the bits are '1' or '0', and the probabilities that the values of the bits corresponding to the target pulse are '1' and '0' are both 50% (as shown in fig. 3).
The pulse width T of the first three pulses (the first two pulses of the target pulse and the target pulse) of the target pulse (the third pulse S3)Front sideS1+ S2+ S3 is 37, and the values of the bits corresponding to the first two pulses of the target pulse are '00', and according to the probability table shown in fig. 3, it can be found that the probabilities that the values of the bits corresponding to the target pulse are '1' and '0' are both 100% and 0%.
The pulse width T of three (including the pulse preceding the target pulse, the target pulse and the pulse following the target pulse) of the target pulse (the third pulse S3)InSince the bit value corresponding to the previous pulse (the second pulse S2) of the target pulse is '0', it can be found that the probability tables shown in fig. 3 show that the probability tables of the target pulse corresponding to the bit values of '1' and '0' are both 50% and 50%.
The pulse width T of the last three pulses (including the target pulse and its two last pulses) of the target pulse (third pulse S3)Rear end＝S3+S4+S5＝40，It is confirmed that there is one '1' and two '0' in S3, S4, and S5, and the probability that the bit values corresponding to the target pulse are '1' and '0' is 33% and 67%, respectively (as shown in fig. 3).
In summary, the total probability value that the bit value corresponding to the target pulse (the third pulse S3) is '1' can be obtained by performing the summation operation on the current target pulse (the third pulse S3) according to the above 6 probabilities: the integrated probability value that 50% + 100% + 50% + 50% + 33% + 3.33 corresponds to the bit value of the target pulse (the third pulse S3) being '0' is: 50% + 0% + 50% + 50% + 50% + 67% + 2.67, it is obvious that 2.67<3.33, i.e., the integrated probability value that the value of the target pulse (third pulse S3) corresponding bit is '0' is smaller than the integrated probability value that the value of the target pulse (third pulse S3) corresponding bit is '1', and therefore, it can be determined that the value of the target pulse (third pulse S3) corresponding bit is '1'.
After the bit value corresponding to the current target pulse (the third pulse S3) is determined, the decoding of the next pulse is started, and the fourth pulse is used as a new target pulse, and similarly, it can be seen that the bit values corresponding to the fourth pulse S4 and the fourth pulse S5 are both '0'.
Taking the FM0 encoded data in fig. 5 as an example, as shown in fig. 5, the bandwidth of each single pulse is: 22 for S1, 18 for S2, 14 for S3, 12 for S4, 10 for S5; presetting an error as 2; similar to the method for decrypting the encoded data shown in fig. 4, based on the data shown in fig. 3, the comprehensive probability values of '1' and '0' of the bit corresponding to the third pulse are calculated to be 1.75 and 4.25, respectively, and the value of '0' of the bit corresponding to the third pulse can be determined; finally, the values of the bits corresponding to the first pulse to the fifth pulse are '1', '1', '0', '0', '0', and '0', respectively.
In the embodiment of the invention, each single pulse in the data to be decoded is taken as a target pulse in sequence, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at the moment, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values of the bit corresponding to the target pulse, namely '1' and '0', are calculated; the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
EXAMPLE III
Fig. 6 is a schematic structural diagram of a decoding apparatus for FM0 encoding according to a third embodiment of the present invention. The decoding device of the FM0 code provided by the embodiment of the present invention can execute the processing flow provided by the decoding method embodiment of the FM0 code. As shown in fig. 6, the decoding apparatus 30 for FM0 encoding includes: an acquisition module 301 and a decoding module 302.
Specifically, the obtaining module 301 is configured to take each single pulse in the data to be decoded as a target pulse in sequence, and obtain a pulse width of the target pulse.
The decoding module 302 is used to determine whether the pulse width of the target pulse is within an error range of the first threshold or the second threshold.
The decoding module 302 is further configured to calculate a comprehensive probability value that the bit value corresponding to the target pulse is '1' and '0' according to the pulse widths of the target pulse and its neighboring pulses if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold.
The decoding module 302 is further configured to use the value with the large integrated probability value as the value of the bit corresponding to the target pulse.
The apparatus provided in the embodiment of the present invention may be specifically configured to execute the method embodiment provided in the first embodiment, and specific functions are not described herein again.
In the embodiment of the invention, each single pulse in the data to be decoded is taken as a target pulse in sequence, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at the moment, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values of the bit corresponding to the target pulse, namely '1' and '0', are calculated; the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
Example four
On the basis of the third embodiment, in this embodiment, the decoding module is further configured to:
and if the pulse width of the target pulse is within the error range of the first threshold value, determining that the value of the bit corresponding to the target pulse is '1'.
The decoding module is further configured to:
and if the pulse width of the target pulse is within the error range of the second threshold value, determining that the value of the bit corresponding to the target pulse is '0'.
Optionally, the decoding module is further configured to:
according to the pulse width of the target pulse and the pulse width of the previous pulse, calculating a first probability that the value of the bit corresponding to the target pulse is '1' and a second probability that the value of the bit corresponding to the target pulse is '0'; according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0'; calculating the first probability and the third probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse; and calculating the second probability and the fourth probability according to a preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
Optionally, the decoding module is further configured to:
according to the pulse width of the target pulse and the pulse width of the previous pulse, calculating a first probability that the value of the bit corresponding to the target pulse is '1' and a second probability that the value of the bit corresponding to the target pulse is '0'; according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0'; according to the pulse widths of the target pulse and the first two pulses, calculating a fifth probability that the value of the bit corresponding to the target pulse is '1' and a sixth probability that the value of the bit corresponding to the target pulse is '0'; calculating a seventh probability that a bit value corresponding to the target pulse is '1' and an eighth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and two pulses adjacent to the target pulse; calculating a ninth probability that the value of the bit corresponding to the target pulse is '1' and a tenth probability that the value of the bit corresponding to the target pulse is '0' according to the pulse widths of the target pulse and the two pulses after the target pulse; calculating the first probability, the third probability and the fifth probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse; and calculating the second probability, the fourth probability and the sixth probability according to a preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
The apparatus provided in the embodiment of the present invention may be specifically configured to execute the method embodiment provided in the second embodiment, and specific functions are not described herein again.
In the embodiment of the invention, each single pulse in the data to be decoded is taken as a target pulse in sequence, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at the moment, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values of the bit corresponding to the target pulse, namely '1' and '0', are calculated; the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
EXAMPLE five
Fig. 7 is a schematic structural diagram of an FM0 encoding decoding device according to a fifth embodiment of the present invention. As shown in fig. 7, the FM0 encoded decoding device 50 includes: a processor 501, a memory 502, and computer programs stored on the memory 502 and executable by the processor 501.
The processor 501, when executing the computer program stored on the memory 502, implements the decoding method of FM0 encoding provided by any of the method embodiments described above.
In the embodiment of the invention, each single pulse in the data to be decoded is taken as a target pulse in sequence, and the pulse width of the target pulse is obtained; if the pulse width of the target pulse is not within the error range of the first threshold and the second threshold, at the moment, the value of the bit corresponding to the target pulse cannot be accurately determined according to the pulse width of the target pulse, then the pulse widths of the target pulse and a plurality of adjacent pulses are integrated, and the integrated probability values of the bit corresponding to the target pulse, namely '1' and '0', are calculated; the value with the large comprehensive probability value is used as the value of the bit corresponding to the target pulse, so that the decoding accuracy of the FM0 code is improved.
In addition, the embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the decoding method for the FM0 code provided in any of the above method embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. A method of decoding FM0 code, comprising:
sequentially taking each single pulse in the data to be decoded as a target pulse to obtain the pulse width of the target pulse;
determining whether the pulse width of the target pulse is within an error range of a first threshold or a second threshold;
if the pulse width of the target pulse is not in the error range of the first threshold and the second threshold, calculating the comprehensive probability value of the bit corresponding to the target pulse as '1' and '0' according to the pulse width of the target pulse and the adjacent pulses of the target pulse;
and taking the value with the large comprehensive probability value as the value of the bit corresponding to the target pulse.
2. The method of claim 1, wherein determining whether the pulse width of the target pulse is within an error of the first threshold or the second threshold further comprises:
and if the pulse width of the target pulse is within the error range of the first threshold, determining that the value of the bit corresponding to the target pulse is '1'.
3. The method of claim 1, wherein determining whether the pulse width of the target pulse is within an error of the first threshold or the second threshold further comprises:
and if the pulse width of the target pulse is within the error range of the second threshold, determining that the value of the bit corresponding to the target pulse is '0'.
4. The method of claim 1, wherein calculating the integrated probability values of '1' and '0' for the bits corresponding to the target pulse according to the pulse widths of the target pulse and its neighboring pulses comprises:
calculating a first probability that a bit value corresponding to the target pulse is '1' and a second probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and a previous pulse;
according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0';
calculating the first probability and the third probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse;
and calculating the second probability and the fourth probability according to the preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
5. The method of claim 1, wherein calculating the integrated probability values of '1' and '0' for the bits corresponding to the target pulse according to the pulse widths of the target pulse and its neighboring pulses comprises:
calculating a first probability that a bit value corresponding to the target pulse is '1' and a second probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and a previous pulse;
according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0';
according to the pulse widths of the target pulse and the two previous pulses, calculating a fifth probability that the value of the bit corresponding to the target pulse is '1' and a sixth probability that the value of the bit corresponding to the target pulse is '0';
calculating a seventh probability that a bit value corresponding to the target pulse is '1' and an eighth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and two pulses adjacent to the target pulse;
calculating a ninth probability that a bit value corresponding to the target pulse is '1' and a tenth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and the two pulses after the target pulse;
calculating the first probability, the third probability and the fifth probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse;
and calculating the second probability, the fourth probability and the sixth probability according to the preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
6. An FM0 encoded decoding device, comprising:
the acquisition module is used for sequentially taking each single pulse in the data to be decoded as a target pulse and acquiring the pulse width of the target pulse;
a decoding module, configured to determine whether a pulse width of the target pulse is within an error range of a first threshold or a second threshold;
the decoding module is further configured to calculate, according to the pulse widths of the target pulse and its neighboring pulses, integrated probability values that the bit values corresponding to the target pulse are '1' and '0', if the pulse width of the target pulse is not within an error range of a first threshold and a second threshold;
and the decoding module is also used for taking the value with the large comprehensive probability value as the value of the bit corresponding to the target pulse.
7. The apparatus of claim 6, wherein the decoding module is further configured to:
if the pulse width of the target pulse is within the error range of the first threshold, determining that the value of the bit corresponding to the target pulse is '1';
and if the pulse width of the target pulse is within the error range of the second threshold, determining that the value of the bit corresponding to the target pulse is '0'.
8. The apparatus of claim 6, wherein the decoding module is further configured to:
calculating a first probability that a bit value corresponding to the target pulse is '1' and a second probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and a previous pulse;
according to the pulse width of the target pulse and the pulse width of the next pulse, calculating a third probability that the value of the bit corresponding to the target pulse is '1' and a fourth probability that the value of the bit corresponding to the target pulse is '0';
according to the pulse widths of the target pulse and the two previous pulses, calculating a fifth probability that the value of the bit corresponding to the target pulse is '1' and a sixth probability that the value of the bit corresponding to the target pulse is '0';
calculating a seventh probability that a bit value corresponding to the target pulse is '1' and an eighth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and two pulses adjacent to the target pulse;
calculating a ninth probability that a bit value corresponding to the target pulse is '1' and a tenth probability that the bit value corresponding to the target pulse is '0' according to the pulse widths of the target pulse and the two pulses after the target pulse;
calculating the first probability, the third probability and the fifth probability according to a preset operation rule to obtain a comprehensive probability value of '1' of the value of the bit corresponding to the target pulse;
and calculating the second probability, the fourth probability and the sixth probability according to the preset operation rule to obtain a comprehensive probability value of '0' of the value of the bit corresponding to the target pulse.
9. An FM0 encoded decoding device, comprising:
a memory, a processor, and a computer program stored on the memory and executable on the processor,
the processor, when executing the computer program, implements the method of any of claims 1-5.
10. A computer-readable storage medium, in which a computer program is stored,
the computer program, when executed by a processor, implementing the method of any one of claims 1-5.
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