KR100306875B1 - Method for detecting start point of data frame over sequence code - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of detecting a starting point of a data frame in a data communication system and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

An object of the present invention is to provide a method of detecting a starting point of a data frame for finding a starting point of a data frame through sequence codes in a data communication system and a computer-readable recording medium having recorded thereon a program for realizing the method.

3. Summary of Solution to Invention

The present invention provides a data communication system comprising: a first step of sequential sequence codes for predicting a start of data (SOD) in a data communication system; The receiving side system receiving the data code further comprises: a second step of identifying a portion of the data start frame by tracking the received sequence of data codes; And a third step of counting each time a data code is received at the receiving side system to determine a value corresponding to a final data code of the data start frame, and then determining the received data code as a data frame.

4. Important uses of the invention

The present invention is used in a data communication system.

Description

{METHOD FOR DETECTING START POINT OF DATA FRAME OVER SEQUENCE CODE}

The present invention relates to a computer-readable recording medium recording a start point of a data frame and a program for realizing the method in a data communication system. The present invention relates to a method of detecting a starting point of a data frame so that a starting point of a data frame can be found even if some of the parts are lost or damaged, and a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is an exemplary configuration diagram of a general data communication system.

Data communication can be applied if only the basic configuration shown in FIG. In order to perform data communication, a protocol defined between a transmitting side and a receiving side is used.

The data communication system has a data terminal equipment (DTE) and a data circuit terminating equipment (DCE) 12 on the transmitting side, and a data terminal equipment (DTE) 14 and a data line on the receiving side. There is an end device (DCE) 13 to perform data communication.

The DTEs 11 and 14 include computers, pagers, and mobile phone terminals, and the DCE 12 and 13 include modems.

The DTEs 11 and 14 include a central control unit for controlling each module, memory modules such as ROM and RAM, power modules for supplying power, and information for processing or transmitting received information. ) Is composed of display module for editing.

Data DATA generated at the transmitting side DTE 11 is received at the receiving side DCE 13 via a data transmission path (wired or wireless) via the transmitting side DCE 12, and at the receiving side DTE 14 (DATA) will be processed.

2 is an exemplary diagram of a general data communication protocol.

As shown in the figure, a protocol for data communication includes a data start frame (SOD: Start Of Data, 201), a data frame (DATA, 202), and a data end frame (EOD: End Of Data, 203). Is done.

The SOD 201 is a frame for notifying the start of the data frame DATA 202, the data frame DATA 202 is information to be shared between the transmitting side and the receiving side, and the EOD 203 is a data frame. Frame indicating the end of (DATA, 202).

Preamble and additional information may be added or converted to the protocol as shown in FIG. 2. The preamble is included in the SOD 201 and is responsible for notifying the start of the data frame DATA 202 together with the function for synchronizing the internal clock at the receiving side, and the additional information is the data frame DATA 202. Additional information frame for is composed of the recipient address, sender address, information length, and the like. In various data communication, a protocol is configured by adding a preamble and additional information to the SOD 201.

In the protocol as shown in FIG. 2, the transmission state is deteriorated for a while due to burst error, which is an impulse noise when transmitting at the transmitting side, and a part of the SOD 201 is lost or damaged. Can be.

Conventionally, when receiving the lost or damaged SOD 201 through the transmission path, the receiving side cannot find the start of the correct data frame DATA, 202, and thus the reception rate is correct even if the data frame DATA, 202 is correctly received. There was a problem that this is significantly lowered.

The problem as described above will be described in more detail as follows.

In order to accurately receive information necessary for communication with high line error rate, the SOD 201 including a preamble, an additional information frame, a delimiter, and the like is transmitted for synchronization and reception.

The prior art transmits the SOD 201 at the transmitting side and detects the SOD 201 at the receiving side to receive the data frame DATA 202, or transmits the SOD 201 at a constant length at the transmitting side. In the receiving side, the data frame DATA 202 was received after counting by a predetermined length.

However, if the data frame DATA 202 is correctly received due to a temporary burst error, but the code of the SOD 201 is lost or lost, the receiver may not correctly start the data frame DATA 202. There was a problem that the end of the detection of the data frame (DATA, 202) received without error was not detected.

When the SOD 201 is repeatedly transmitted in order to solve such a problem, there is a problem that only additional data is greatly increased and cannot be fundamentally solved.

An example of the prior art is as follows.

If an error of one bit of the 32 bits of the sync signal code of the pager occurs, it is determined that the sync signal is detected and subsequent data signals cannot be detected.

The improvement is that if the number of bit errors of the sync signal code is less than or equal to N predetermined in the detection of the sync signal composed of 32 bits, it is recognized that the prescribed sync signal code is normally detected so that the next transmitted data signal can be detected. It is one (LG Information Communication Patent Publication No. 1995-010400).

However, this is quite vulnerable to burst error. In other words, when transmitted at a rate of 4800 bit per second (BPS), 15 bits of information are lost due to a short interruption of 0.003 seconds, so that N predetermined values are large, which can ensure the reliability of the received data. Not only that, there is a problem in that an implementation method error occurs when there is a loss of a synchronization signal or a pre-embedded SOD 201.

3 to 5 show a misinterpretation of the data frame DATA 202 due to the existing technology.

3A and 3B show an example of a misinterpretation of the received data frame, which shows a misinterpretation caused by the loss of the initial data of the SOD 201 although the data frame DATA 202 is correctly received. have.

3A illustrates a transmission frame transmitted from a transmitting side, and FIG. 3B illustrates a receiving frame received from a receiving side. Here, the PostPreamble belongs to the EOD 203 to inform the end of the frame, whereas the preamble informs the start of the frame belonging to the SOD 201.

If the first and second codes are lost, the first preamble code is detected from the third, and the data frame DATA 202 may be recognized as the preamble code. Then, two codes of the data frame DATA 202 are lost. In addition, the number of bit error occurrences is inevitably larger than N or less predetermined.

Another conventional technique (IBM Publication number 0 505 657 A1 Preamble recognition and synchronization detection in partial-response systems) is a technique focused on signal processing, in which an error received by the maximum-likelihood It is a technique for decoding bits. This technique is a method of decoding the received error bits into probability bits that are probable.

However, the problem with this technique is that a specific hardware implementation must be made and the signal reception probability of the data transmission path must be known in advance. This is possible in wired or short-distance communication because the signal reception probability varies every second when the data path is long and wireless, and is vulnerable when error bits exceed the probability. Decoding the bits beyond this probability also recognizes the next bit as an error bit.

Burst errors can cause the wrong bits to be decoded and processed according to this technique, preventing accurate preambles from being detected. For the same reason, if the end-of-preamble-flag is not detected, the start point of the data frame DATA 202 cannot be found.

4A and 4B illustrate another example of a misinterpretation of the received data frame, in which the data frame DATA 202 is correctly received but an error occurs in the middle of the preamble frame.

In this case, two interpretations are possible on the receiving side. First, when the first preamble code is detected, the fifth code is recognized as the data frame (DATA, 202), and six unnecessary codes are processed as the data frame (DATA, 202). . Otherwise, if the eighth preamble code is detected, the code of the data frame DATA 202 may be recognized as a preamble code, thereby losing seven codes of the data frame DATA 202.

5A and 5B are another exemplary diagram of a misinterpretation of the received information data frame.

The data frames DATA and 202 are correctly received, but an error of data occurs at the end of the preamble frame.

The first preamble code is detected, and the seventh code is recognized as a data frame (DATA) code so that three unnecessary codes are processed as data of the data frame (DATA).

As described above, the conventional method used in data communication alone is used to determine the SOD (Start Of Data) frame due to an error caused by various error sources (signal distortion, attenuation loss, influence of atmospheric magnetic field) in wireless communication. There is a problem that can not receive the correct information data frame (DATA) due to loss and corruption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a method for detecting a starting point of a data frame for finding a starting point of a data frame through a sequence code during data transmission and reception in a data communication system, and a program for realizing the method. Its purpose is to provide a computer-readable recording medium having recorded thereon.

1 is an exemplary configuration diagram of a general data communication system.

2 is an exemplary diagram of a general data communication protocol.

3A and 3B illustrate one example of incorrect interpretation of a received data frame.

4A and 4B illustrate another example of incorrect interpretation of a received data frame.

5A and 5B illustrate another example of a misinterpretation of received information data frames.

6A and 6B are exemplary views illustrating a data transmission / reception protocol to which the present invention is applied.

7 is an exemplary view of a preamble to which the present invention is applied.

8 is a flow diagram of one embodiment of a method for finding the beginning of a data frame through a sequence code in accordance with the present invention.

Fig. 9 is an exemplary view of finding data start when the data transmission path is in good condition using the present invention.

10A and 10B illustrate an example of finding a data start when an error of preamble initial data occurs using the present invention.

11A and 11B illustrate an example of finding data start when an error occurs during preamble using the present invention.

12A and 12B illustrate an example of finding data start when an error occurs at the end of a preamble using the present invention.

13A and 13B illustrate an example of finding a data start when a first synchronization of a preamble frame is not detected in hardware using the present invention.

* Explanation of symbols for the main parts of the drawings

11 transmitter side data terminal apparatus 12 transmitter side data line terminator

13: Receiving side data line termination device 14: Receiving side data terminal equipment

In order to achieve the above object, the present invention provides a method of detecting a starting point of a data frame (DATA) applied to a data communication system, the sequential sequence capable of predicting a start of data (SOD) in the data communication system. A first step of consisting of codes; The receiving side system receiving the data code further comprises: a second step of identifying a portion of the data start frame by tracking the received sequence of data codes; And a third step of counting each time a data code is received in the receiving side system to determine a value corresponding to a final data code of the data start frame, and then determining the received data code as a data frame. do.

The present invention also provides a data communication system having a large capacity processor, comprising: a first function of sequential sequence codes for predicting a start of data (SOD) in the data communication system; A receiving side system receiving the data code includes: a second function of tracking a sequence of received data codes to identify a portion of a data start frame; And a program for realizing a third function of counting each time a data code is received by the receiving side system, checking a value corresponding to the last data code of the data start frame, and then determining the received data code as a data frame. Provide a computer readable recording medium.

The detection technology of the existing data start frame (SOD) is focused on finding the code of the simple SOD, so even if the data frame (DATA) is correctly received, the burst noise (impulse noise) of the SOD is caused by the sudden noise. If the code is lost or lost, the data frame may not be correctly received. However, the present invention uses a SOD as a sequence code, and uses and adjusts the SOD to cause a burst error. Even if there is a loss or loss of the SOD code, only a portion of the sequence code is used to find the end of the SOD and accurately detect the beginning of the data frame (DATA).

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6A and 6B are exemplary views illustrating a data transmission / reception protocol to which the present invention is applied.

The protocol of FIG. 6A is an example of a general protocol when used in a communication requiring no additional information, and FIG. 6B is a protocol configured in a communication requiring additional information. 6A and 6B show that the method of finding the start of the data frame DATA in the protocol is the same as detecting the preamble and detecting the delimiter. I will explain.

In general, a preamble is used to make all receiving circuits connected to a transmission medium in a stable state and to synchronize bit synchronization with a hardware transmission clock. Software detects a start point of a data frame (DATA).

The present invention focuses on detecting the starting point of the data frame DATA in software. In other words, a part of the preamble code is lost or corrupted due to a burst error from the preamble before the data code DATACode of the data frame DATA is transmitted. Even if there is no loss or corruption, if the start point of the data frame DATA is not detected due to the loss or corruption of the preamble code, the receiver recognizes and receives wrong data as the content of the data frame DATA. In the present invention, a technique for preventing a mistake of actual information due to such an error is prevented. Therefore, there is no technology added in hardware, and a general data communication system can be sufficiently implemented.

7 is an exemplary view of a preamble to which the present invention is applied.

The preamble consists of respective preamble codes 73, and the preamble code 73 consists of an upper nibble 71 and a lower nibble 72. The preamble code 73 consists of 1 byte, and the upper nibble 71 and the lower nibble 72 each consist of 4 bits. The upper nibble 71 consists of a specific value of 4 bits, and the lower nibble 72 is defined as a sequential index value.

In the protocol exemplified in the present invention, the configuration of the preamble consists of five or more codes. The number of preamble codes may be determined in consideration of the channel state of the data transmission path.

The upper nibble 71 of the preamble code 73 is constantly composed of α, and the lower nibble 72 is composed of a sequence of β + i (1 ≦ i ≦ ψ).

In the transmitting DTE 11, a preamble code and a data frame DATA are generated as shown in FIG. 7, and then the receiving side is transmitted through the receiving side DCE 13 through the data transmission path through the transmitting DCE 12. Will be received at the DTE 14.

8 is a flowchart illustrating a method of detecting a starting point of a data frame through a sequence code according to the present invention.

When explaining the present invention. First, the receiving side DTE 14 receives a 1-byte data code transmitted from the transmitting side DTE 11 (801). Check whether the received data code is included in the preamble. This first checks if the upper nibble (upper 4 bits of the data code) of the received data code is equal to α and ω is equal to δ (802). Here, α denotes a constant value of the upper nibble 71 of the preamble code 73, and ω is a value that is counted when the normal preamble code 73 is received and the initial value is 0.

δ is used to fix the value of ω to any value. However, a value that can be used as the ω value while receiving the preamble code cannot be used as the δ value. That is, the value of ω may vary from 0 to 8, and if the value of δ is 6, ω may not be 7 or 8, and finding the start of the data frame DATA may not proceed correctly.

If the upper nibble 71 of the received data code is equal to α and ω is not δ, then the upper nibble 71 is equal to α and ω is not δ Increase 1 by 803. here, Is a value for adjusting the index of the reception code, and indicates a value to be taken by the preamble code, and its initial value is 1 byte with αβ indicating the upper and lower nibbles of the preamble.

In order to determine whether a received data code included in a preamble sequence code is an accurate index, It is checked whether and the received data code is the same (804). If the result is equal, ω is increased by 1 (805), and if it is not equal, the received data code is The index is adjusted by inputting in step 806.

Next, to determine whether to use φ, it is checked whether ω is equal to ε (807). If the values of ω and ε are the same, then φ Then substitute δ for ω (808), and if not equal, proceed to the next step.

Further, as a result of checking whether the upper nibble of the received data code is equal to α and ω is equal to δ, if the upper nibble is not equal to α or ω is equal to δ, then ω is ε In operation 807, the process is examined.

Here, ε is a predetermined value for the number of preamble codes that arrive at the same value as the predicted value and the actual arrival value, and can be determined according to the probability of occurrence of noise in the data transmission path, and φ is the normal number of ε preamble codes. This value is incremented when the data code arrives after it has been reached.

In order to adjust the preamble sequence code with φ, it is checked whether the ω value matches δ (809). As a result of the test, if the value of ω matches δ, φ is increased by 1 (810). If the ω value does not match δ, go to the next step.

Finally, to detect the end point of the preamble, the end point of the preamble is found by comparing whether φ equals αβ + ψ + 1 (811). Here, ψ represents the number of preamble codes.

As a result of comparing whether φ is equal to αβ + ψ + 1, if φ is not equal to αβ + ψ + 1, the process is repeatedly performed from step 801 of receiving the next data code.

As a result of comparing whether φ is equal to αβ + ψ + 1, if φ is equal to αβ + ψ + 1, it is determined that the starting point of the data frame DATA is detected, and then the data code of the data frame DATA is It will receive (812).

Ε can be changed according to the channel state of the transmission medium.In the following example, ε is defined as 4 when the preamble code is lost or lost due to a transient burst error. It explains the detection of the correct starting point of (DATA) and the reception of data.

9 illustrates an example of detecting a starting point of a data frame DATA when the data transmission path is in good condition according to the present invention.

Here, the value of δ is an arbitrary value that falls outside the count range of ω, and is -1, and the initial value of ω is 0.

A first data code 'αβ + 1' of FIG. 9 is received (801).

The upper nibble α of the received 'αβ + 1' and the upper nibble α of the preamble code predicted by the receiving side are the same, and '0', the value of ω, is '-1', which is the value of δ. Is not equal to The value 'αβ' is increased to 'αβ + 1' (802 and 803).

Since the value 'αβ + 1' and the received data code 'αβ + 1' coincide, the ω value is increased from '0' to '1' (804 and 805).

When steps 801 to 805 are repeated until the current ω value of '1' and '4' of ε coincide, and the ω value and the ε value coincide. Is a value of alpha beta + 4, a received data code is alpha beta + 4, and a value of o is 4. At this time Is substituted for ω and '-1' is substituted for ω. Then φ becomes 'αβ + 4' and ω becomes '-1' (807, 808).

Since ω and δ coincide with '-1' for the received data code, φ is increased regardless of the received data code (809 and 810).

The value of φ is increased while repeating the entire process until the value of φ coincides with a value of 'αβ + ψ', which is the last sequence preamble code value.

When the last sequence preamble code (αβ + ψ) is received, the value of φ is increased by 'αβ + ψ + 1', and φ and 'αβ + ψ + 1' coincide with the next received data code. (data codes) are treated as data of the data frame (DATA).

10A and 10B illustrate an example of detecting a data start point when an error of preamble initial data occurs using the present invention.

FIG. 10A shows a transmission data frame, FIG. 10B shows a reception data frame, and defines a preamble code with α = 7, β = 0, ψ = A.

If '0x34' is received, there is no satisfying process, and after receiving the next code '0x56' and '0x45' in order until the satisfying code comes out, the upper nibble of the received data code is 0x7. After receiving the '0x74' code The initial value of '0x70' is increased to '0x71' (801, 802, and 803).

The receiving preamble code Since the value '0x71' does not match the actual received data code '0x74' The received data code '0x74' is substituted into 804 and 806.

Since the determination processes of 807, 809, and 811 are not satisfied, a data code '0x75' is next received (801).

Since the upper nibble value of the received data code '0x75' and the upper nibble value α expected by the receiving side are equal to '7', The value '0x74' is increased to '0x75' (802 and 803).

Since the value '0x75' and the reception code '0x75' coincide with each other, the ω value is increased from '0' to '1' (804 and 805).

Since the received data code '0x75' does not satisfy the determination processes of 807, 809, and 811, the next data code is received again and repeatedly performed until the process 807 of determining whether ω has a value equal to ε is satisfied.

received data code until the value of ω equals the value of ε, Values and ω values are shown in Table 1 below.

Receiving data code 0x75 0x76 0x77 0x75 0x76 0x77 ω 2 3 4

As shown in [Table 1], the received data code is '0x77', When the value is '0x77' and the ω value is '4', the initial value of ε is '4'. Therefore, the process of judging whether ω has the same value as ε is satisfied. Substitute '0x77' as the value of φ. is substituted for ω (807, 808).

As a result of confirming that ω and δ match, φ is increased because ω and δ match (809, 810).

As the data code is received, the algorithm for the received data code is repeatedly executed until the value of φ counted as the data code is received and '0x7A' which is the last value of the preamble code known to the receiver plus 1 are matched. Only φ is increased because the determination conditions of steps 804, 807 are not satisfied.

This is shown in the following table [Table 2].

Receiving data code 0x78 0x79 0x7A φ 0x79 0x7A 0x7B

A value of 0x7B and a final sequence preamble code '0x7A' plus 1 are matched to process the next received data codes as data of the data frame DATA.

11A and 11B illustrate an example of detecting a data start point when an error occurs during preamble using the present invention.

FIG. 11A shows a transmission data frame, FIG. 11B shows a reception data frame, and defines a preamble code with α = 7, β = 0, ψ = A. FIG.

'0x71' is received at the receiver and after each process, ω and When the value of is changed and an error data code '0x71' is received, Will be adjusted.

Receiving data code 0x71 0x72 0x73 0x71 (803 course) 0x71 0x72 0x73 0x74 ω (805 course) (806 course) One 2 3 0x71

The fifth reception code '0x34' and the sixth reception code '0x21' are processed in the algorithm of the present invention and are passed without changing the value. The value of is as it is.

When the 7th reception code '0x77' and the 8th reception code '0x78' are received, ω and Is changed, which satisfies the process 807 of determining whether ω has a value equal to ε.

Receiving data code 0x77 0x78 (803 course) 0x72 0x78 ω (805 course) (806 course) -0x77 4-

ω and ε match, so φ The value '0x78' is substituted, and δ is substituted for ω.

Since the values of ω and δ coincide, φ is increased when data is received.

Until φ and '0x7A', the last value of the preamble code, plus 1, do not satisfy the conditions of 802, 804, and 807, only φ is increased.

This is shown in the table below.

Receiving data code 0x79 0x7A φ 0x7A 0x7B

The value of φ equals 0x7B and the last sequence preamble code '0x7A' plus 1, so that the next received data codes are processed as data in the data frame.

12A and 12B illustrate an example of detecting a data start point when an error occurs at the end of a preamble using the present invention.

12A shows a transmission data frame, FIG. 12B shows a reception data frame, and defines a preamble code with α = 7, β = 0, ψ = A. FIG.

By applying this algorithm until the data code '0x74' is received, And ω change and ω and ε coincide, so φ Is substituted and δ is substituted for ω. This is illustrated in Table 6 below.

Receiving data code 0x71 0x72 0x73 0x71 (803 course) 0x71 0x72 0x73 0x71 ω (805 course) (806 course) One- 2- 3- 4-

Since ω and δ coincide with the received data code, φ is increased.

Until φ and '0x7A', which is the last value of the preamble code, add 1, the conditions of the processes 802, 804, and 807 are not satisfied, so only φ is increased. It does not matter if a data error occurs at the end of the preamble frame.

If the value '0x7B' and '0x7B', the value of the last sequence preamble code plus 1, match, the next received data codes are processed as data of the data frame.

13A and 13B illustrate an example of detecting a data start point when the first synchronization of a preamble frame is not detected in hardware using the present invention.

FIG. 13A shows a transmission data frame, FIG. 13B shows a reception data frame, and defines a preamble code with α = 7, β = 0, and ψ = A.

Even though the initial synchronization signal is not detected by hardware, even if the transmission codes '0x71' to '0x73' are not received, the beginning of the data frame can be detected in the same manner as in the case where an error of the preamble initial data of FIG. 10 occurs. have.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, by making the SOD as a sequence code (Sequence Code) to use and adjust it, even if there is a loss or loss of the SOD code due to the burst error (burst error) to accurately find the end point of the SOD to start the data frame As a technology that can detect the error, it can improve the reception rate by processing the burst error which is the hard noise that is difficult to process in hardware and can improve the reception rate. It can be applied to to find the part corresponding to the data frame in the received data code.

Claims (5)

In the method for detecting the starting point of a data frame (DATA) applied to a data communication system, A first step of sequential sequence codes for predicting a start of data (SOD) in the data communication system; The receiving side system receiving the data code further comprises: a second step of identifying a portion of the data start frame by tracking the received sequence of data codes; And A third step of counting each time a data code is received in the receiving system to determine a value corresponding to the last data code of the data start frame, and then determining the received data code as a data frame; Starting point detection method of a data frame through a sequence code comprising a. The method of claim 1, The predictable sequential sequence code, The upper part of the code is a predetermined predetermined value, and the lower part is a code that can be predicted because the lower part is a value that changes sequentially. The method of claim 1, The second step, A fourth step of confirming whether an upper portion of the data code received at the receiving side system has a prescribed predetermined value; A fifth step of repeating from the fourth step on the next received data code if it does not have the prescribed value defined as a result of the checking in the fourth step; A sixth step of judging whether the received data code coincides with the predicted data code in the receiving system based on the previously predicted data code as a result of the checking in the fourth step; A seventh step of repeating the fourth step by setting the predicted value of the next data code to be received next if it does not match based on the received data code as a result of the determination in the sixth step; And As a result of the determination in the sixth step, when the match is made, the eighth step of checking whether the number of correctly received data codes is increased by a predetermined number by increasing the number of data codes of the correctly received data start frame. Starting point detection method of a data frame through a sequence code comprising a. The method according to any one of claims 1 to 3, The third step, The receiving system that receives the data code of the data start frame tracks the sequence of the received data code and checks whether the predicted value of the received data code matches the final value predicted by the receiving system if it finds a part of the data start frame. Ninth step; As a result of the check in the ninth step, if the predicted value of the received data code does not match the final value, the receiving side system receives a new received data code and sequentially changes the predicted value of the received data code and repeats from the ninth step. Performing a tenth step; And An eleventh step of determining that a subsequent received data code is a code of a data frame if the predicted value of the received data code matches the final value as a result of the checking of the ninth step; Starting point detection method of a data frame through a sequence code comprising a. In a data communication system having a large capacity processor, A first function of sequential sequence codes for predicting a start of data (SOD) in the data communication system; A receiving side system receiving the data code includes: a second function of tracking a sequence of received data codes to identify a portion of a data start frame; And A third function of counting each time a data code is received by the receiving side system to determine a value corresponding to a final data code of the data start frame, and then determining the received data code as a data frame A computer-readable recording medium having recorded thereon a program for realizing this.