CN112291039B - Data coding transmission method based on channel signal period - Google Patents
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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Abstract
The invention discloses a data coding transmission method based on a channel signal period, which comprises the following steps: the transmitting end includes: periodic coding and channel signal forming; the receiving end includes: signal acquisition and periodic decoding; a sending end encodes data to be transmitted into a period of a channel signal, a receiving end collects the channel signal and extracts a fundamental wave period from the collected signal, and then the fundamental wave period is decoded into corresponding transmission data; wherein the period of the channel signal comprises: the sending end and the receiving end agree on a fixed signal period as a start code and a data code encoded behind the start code. The invention can realize high-reliability data transmission in a complex channel environment, provides a coding design with self-adaptability based on the principle of a measurement period, and inhibits the defect of data transmission errors caused by the stability of a clock source.
Description
Technical Field
The invention relates to the field of data transmission, in particular to a data coding transmission method based on a channel signal period.
Background
The binary digital coding transmission technology is mature and widely applied, and can be classified into the following modes according to different carrier parameter coding modes: amplitude keying (ASK), frequency keying (FSK), and phase keying (PSK). However, in some special applications, the carrier signal used by the binary digital coding technique is limited by the channel during transmission, and high-reliability data transmission cannot be realized. For example, in a seawater environment, a channel formed by using parallel enameled wires for data transmission of an expendable conductivity temperature depth profiler (XCTD) has a large amount of distributed resistance, distributed inductance and distributed capacitance between a transmission line and seawater, so that the channel characteristics are relatively complex. After signals are transmitted through a channel, attenuation and distortion are very serious, so that a high bit error rate is easy to occur in digital coding transmission, the transmission reliability is poor, and the range of available carrier frequencies is greatly limited.
In addition, the digital coding transmission is carried out in a manner of authorized codes, and the transmission of the authorized codes has the defects: when there are some bits with transmission errors during transmission, if the checking mechanism cannot find the transmission errors, the transmitted data is completely unusable at a high probability.
Disclosure of Invention
The invention provides a data coding transmission method based on a channel signal period, which can realize high-reliability data transmission in a complex channel environment, provides a coding design with self-adaptability based on the principle of a measurement period, and inhibits the defect of data transmission errors caused by clock source stability, and is described in detail as follows:
a method for data encoding transmission based on a channel signal period, the method comprising:
the transmitting end includes: periodic coding and channel signal forming; the receiving end includes: signal acquisition and periodic decoding; a sending end encodes data to be transmitted into a period of a channel signal, a receiving end collects the channel signal and extracts a fundamental wave period from the collected signal, and then the fundamental wave period is decoded into corresponding transmission data;
wherein the period of the channel signal comprises: the sending end and the receiving end agree on a fixed signal period as a start code and a data code encoded behind the start code.
The receiving end carries out window function sliding processing on the collected signals to extract the fundamental wave period of the signals, wherein the length of the window function is determined by sampling frequency and the period extraction precision to be realized.
Further, the collecting channel signals and extracting fundamental wave periods from the collected signals by the receiving end specifically include:
acquiring signals in a channel by using an ADC (analog to digital converter) to obtain channel signal sampling data;
determining the length and the sliding step length of a window function, and performing sliding short-time Fourier transform on the original signal to obtain the fundamental wave period of the sub-signal section;
according to the Pauta criterion principle, singular value elimination is set according to a 2 sigma elimination standard, and an average period after the singular value elimination is used as an extracted fundamental wave period.
Wherein the window function length and the sliding step satisfy the following relationship:
seglength+steplength×(segnum-1)＝samplenum
wherein, samplenum is the data length of the channel signal, seglength is the window function length, steplength is the window function sliding step length, and segnum is the number of segments under the original signal length.
Further, according to the Pauta criterion principle, setting a 2 σ elimination standard elimination singular value specifically includes:
|ΔTi|＝|Ti-μT|＞2σT,i＝1,2,...,segnum
wherein, muTTo extract the mean value of the fundamental period, TiFor measuring period, σTThe standard deviation of the extraction period.
The technical scheme provided by the invention has the beneficial effects that:
1. the invention can complete reliable data transmission in a particularly severe channel environment, such as the reliable data transmission under the conditions of signal waveform distortion and serious amplitude attenuation;
2. the invention can reduce the degree of transmission errors, and compared with digital authorized code transmission, the transmitted data errors are relatively small;
3. the invention adds the reference signal period at the sending end and corrects the data coding corresponding signal period at the receiving end by using the reference signal period, thereby inhibiting the adverse effect caused by the clock stability in the data transmission, leading the data coding transmission based on the channel signal period to have self-adaptability and improving the reliability of the data transmission and the robustness of the data transmission system.
Drawings
Fig. 1 is a schematic diagram of a data encoding transmission method based on a channel signal period;
FIG. 2 is a schematic diagram of a coding scheme based on the period of a channel signal;
FIG. 3 is a schematic diagram of a sliding channel signal period extraction at the receiving end;
FIG. 4 is a graph illustrating the difference in cycle encoding due to clock stability.
In the drawings, the components are represented in the following list:
101: a sending end; 102: data to be encoded;
103: periodic coding; 104: a channel signal former;
105: a channel; 106: signal receiving and processing;
107: periodic decoding; 108: a receiving end;
201: a reference code; 202: a first data code;
203: a second data code; 204: a third data code;
301: a data segment A; 302: window sliding step length;
303: a data segment B; 304: a data segment length;
305: receiving the channel signal collected by the terminal; 401: a sending end A;
402: a sending end B; 403: and a transmitting end C.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
Example 1
A data coding transmission method based on a channel signal period, referring to fig. 1, the method comprising: a transmitting end 101, a receiving end 108 and a data transmission channel 105;
further, the transmitting end includes: 102 parts of data to be encoded, 103 parts of data encoding signal periods and 104 parts of channel signal formers; the receiving end includes: signal processing reception 106, periodic decoding 107;
in specific implementation, the implementation method of the sending end and the receiving end is not limited in any way in the embodiments of the present invention, as long as the signal period can be encoded and decoded.
Referring to fig. 2, the data-encoded signal period 103 includes: a start code 201, a first data code 202, a second data code 203, and a third data code 204.
In specific implementation, the start code 201 is a fixed signal period code agreed by the transmitting end and the receiving end, the data following the start code is the first data code 202, the second data code 203, and the third data code 204 in sequence, the number of the following data is set according to specific data transmission requirements, in example 1, three data are transmitted in each group, and one start code 201 is added before each transmitted three data.
Further, channel signals are detected and collected at a receiving end, fundamental wave periods are extracted from the collected signals, and then the fundamental wave periods are decoded into corresponding transmission data.
Referring to fig. 3, a schematic diagram of data processing at a receiving end is shown, where window function sliding processing is performed on a collected signal 305, a window function length 304 of the data sliding processing is determined according to a sampling frequency, and generally includes more than 30 signal cycles, a more accurate extraction result can be obtained, and the smaller a sliding step 302 is set, the larger a data processing amount is, and real-time performance is reduced.
Further, after the period extraction of the data segment 301 is finished, the window function sliding step length 302 is used for extracting the fundamental wave period of the data segment 303, the fundamental wave periods are sequentially subjected to sliding processing to obtain a series of fundamental wave periods, and then the transmitted data are obtained through decoding.
In a specific implementation, the data transmission process includes: data period coding, channel signal generation, channel signal detection and acquisition, channel signal processing, period decoding and the like. The invention is not limited in its implementation details.
In summary, the period-coded data transmission method provided in the embodiments of the present invention encodes transmission data into a period of a channel signal for transmission by using the stability of a fundamental wave period in a channel signal transmission process, so as to improve the reliability of data transmission.
Example 2
A data coding transmission method based on a channel signal period, referring to fig. 1, the method comprising: a transmitting end 101, a receiving end 108 and a data transmission channel 105;
further, the transmitting end includes: 102 parts of data to be coded, 103 parts of data period coding and 104 parts of a channel signal former; the receiving end includes: signal processing reception 106, periodic decoding 107;
in specific implementation, the implementation method of the sending end and the receiving end is not limited in any way in the embodiments of the present invention, as long as the signal period can be encoded and decoded.
Referring to fig. 2, the data period encoding 103 is composed of: a start code 201, a first data code 202, a second data code 203, and a third data code 204.
In specific implementation, the start code 201 is a fixed signal period code agreed at both ends of the transceiver, the data following the start code are the first data code 202, the second data code 203, and the third data code 204 in sequence, the number of the following data is designed according to specific data transmission requirements, in example 2, three data are transmitted in each group, and one start code 201 is added before each transmitted three data.
Unlike embodiment 1, the present embodiment uses the start code as the reference code for data encoding, and the reference code can be used as both the start mark of a group of data and the reference for extracting the fundamental wave period. When clock stability or clock precision are not enough, the coding design of the reference code can effectively restrain the coding transmission error caused by the clock stability and clock precision of the sending end, see fig. 3, which are three different sending ends respectively, including: a transmission end a 401, a transmission end B402, and a transmission end C403. Under the condition of poor clock stability and accuracy, the same group of data is coded, and the obtained absolute coding periods are inconsistent. When the receiving end detects and processes the data, the existence of the periodic coding error cannot be identified, and the precision of data transmission is reduced.
Referring to fig. 4, the signal period measurement results of the same data sent by different sending terminals at the receiving terminal are respectively: t isstart1、T11、T12、T13、Tstart2、T21、T22、T23、Tstart3、T31、T32And T33。
Wherein, Tstart1、T11、T12And T13Sending a measurement of the signal for the first sender, Tstart2、T21、T22And T23Sending a measurement of the signal for the second sender, Tstart3、T31、T32And T33A measurement of the signal is sent for a third sender. Under ideal conditions：Tstart1＝Tstart2＝Tstart3＝Tstart、T11＝T12＝T13＝T1、T21＝T22＝T23＝T2And T31＝T32＝T33＝T3However, there is a problem of clock stability and it is not absolutely equal. However, they satisfy the equations (1) to (3) at the same clock pulse:
that is to say, when the same data is periodically encoded by different transmitting terminals, the ratio of the encoding period corresponding to the data code to the encoding period corresponding to the reference code at the front end of the data code is not changed, thereby reducing the encoding error caused by the difference of clock sources at the transmitting terminals. T is obtained by calculation according to the formulas (4) to (6)1、T2、T3As follows:
therefore, the reference code has the functions of 'alignment' and 'calibration' on the data coding signal, so that the periodic coding has the self-adaptability, the systematic error introduced by the clock of the transmitting end is overcome, and the reliability of transmission is ensured.
Further, channel signals are detected and collected at the receiving end, fundamental wave periods are extracted from the collected signals, and then the fundamental wave periods are decoded into transmitted data.
Referring to fig. 3, a schematic diagram of data processing at a receiving end is shown, where window function sliding processing is performed on a collected signal 305, a window function length 304 of the sliding processed data is determined according to a sampling frequency, and generally includes more than 30 signal cycles, a relatively accurate extraction result can be obtained, and the smaller a sliding step 302 is set, the larger a data processing amount is, and real-time performance is reduced.
Further, after the period extraction of the data segment 301 is finished, the window function sliding step length 302 is used for extracting the fundamental wave period of the data segment 303, the fundamental wave periods are sequentially subjected to sliding processing to obtain a series of fundamental wave periods, and then the transmitted data are obtained through decoding.
In a specific implementation, the data transmission process includes: data period coding, channel signal generation, channel signal detection and acquisition, channel signal processing, period decoding and the like. The invention is not limited in its implementation details.
In summary, in the embodiments of the present invention, a channel signal period agreed by a sending end and a receiving end is used as a start code, and when a fundamental wave period is extracted, the start code is used as a reference code, so that errors in periodic coding due to clock stability and clock inconsistency are suppressed, and data transmission is adaptive due to the introduction of the reference code.
Example 3
A data coding transmission method based on a channel signal period, referring to fig. 1, the method comprising: a transmitting end 101, a receiving end 108 and a data transmission channel 105;
further, the transmitting end includes: 102 parts of data to be coded, 103 parts of data period coding and 104 parts of a channel signal former; the receiving end includes: signal processing reception 106, periodic decoding 107.
In specific implementation, the implementation method of the sending end and the receiving end is not limited in any way in the embodiments of the present invention, as long as the channel signal period can be encoded and decoded.
Referring to fig. 2, the data period encoding 103 includes: a start code 201, a first data code 202, a second data code 203, and a third data code 204.
In specific implementation, the start code 201 is a fixed signal period code agreed by the transmitting end and the receiving end, the first data code 202, the second data code 203, and the third data code 204 are sequentially arranged behind the start code, the number of the following data is set according to specific data transmission requirements, in embodiment 3, for example, each group transmits three data, and one start code 201 is added before each transmitted three data.
Further, channel signals are detected and collected at the receiving end, and the fundamental wave period is extracted from the collected signals.
The specific steps for extracting the fundamental wave period are as follows:
(1) acquiring signals in a channel by using an ADC (analog to digital converter) to obtain a group of sampling data;
(2) determining sliding short-time Fourier transform parameters.
In order to fully utilize the original data and ensure the integrity of the data, an optimal segmentation scheme is selected according to the formula (7):
seglength+steplength×(segnum-1)＝samplenum (7)
wherein, samplenum is the data length of the channel signal, i.e. the total number of sampling points, seglength is the window function length, steplength is the window function sliding step length, and segnum is the number of segments under the original signal length.
(3) After determining the window function length seglength and the sliding step length, performing sliding short-time Fourier transform on the original signal through the window function to obtain the fundamental wave frequency of the sub-data segment, and further obtaining the fundamental wave period.
(4) After the signal period is extracted by sliding, according to the Pauta criterion principle, a 2 sigma rejection criterion is set to reject singular values, as shown in equation (8):
|ΔTi|＝|Ti-μT|＞2σT,i＝1,2,...,segnum (8)
wherein, muTFor extracting the average value of the fundamental period, when measuring the period TiWhen equation (8) is satisfied, the period value is determined as a singular value, the data is discarded, and the above process is repeated until no singular value exists in the measured period value.
(5) And taking the average period after the singular value is removed as an extraction period.
Finally, the fundamental wave period is decoded into the transmitted data.
In a specific implementation, the data transmission process includes: data period coding, channel signal generation, channel signal detection and acquisition, channel signal processing, period decoding and the like. The invention is not limited in its implementation details.
In summary, the embodiment of the present invention can improve the measurement precision of the period by using the short-time fourier transform to extract the fundamental wave period and the outlier rejection method, and can further ensure the reliability of data transmission.
In the embodiment of the present invention, except for the specific description of the model of each device, the model of other devices is not limited, as long as the device can perform the above functions.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-described embodiments of the present invention are merely provided for description and do not represent the merits of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for data encoding transmission based on channel signal period, the method comprising:
the transmitting end includes: periodic coding and channel signal forming; the receiving end includes: signal acquisition and periodic decoding; a sending end encodes data to be transmitted into a period of a channel signal, a receiving end collects the channel signal and extracts a fundamental wave period from the collected signal, and then the fundamental wave period is decoded into corresponding transmission data;
wherein the period of the channel signal comprises: a fixed signal period is appointed by a sending end and a receiving end to be used as a starting code and a data code coded behind the starting code;
the method for acquiring the channel signal and extracting the fundamental wave period from the acquired signal by the receiving end specifically comprises the following steps:
acquiring signals in a channel by using an ADC (analog to digital converter) to obtain channel signal sampling data;
determining the length and the sliding step length of a window function, and performing sliding short-time Fourier transform on the channel signal sampling data to obtain the fundamental wave period of the sub-signal section;
according to the Pauta criterion principle, singular value elimination is set according to a 2 sigma elimination standard, and an average period after the singular value elimination is used as an extracted fundamental wave period.
2. The method according to claim 1, wherein the receiving end performs window function sliding processing on the collected signal to extract a fundamental period of the signal, wherein a length of the window function is determined by a sampling frequency and a period extraction precision to be achieved.
3. The method of claim 1, wherein the window function length and the sliding step satisfy the following relationship:
seglength+steplength×(segnum-1)＝samplenum
wherein, samplenum is the data length of the channel signal, seglength is the window function length, steplength is the window function sliding step length, and segnum is the number of segments under the original signal length.
4. The method according to claim 1, wherein the setting of the 2 σ -culling norm-culling singular value according to the Pauta criterion principle is specifically as follows:
|ΔTi|＝|Ti-μT|＞2σT,i＝1,2,...,segnum
wherein, muTTo extract the mean value of the fundamental period, TiFor measuring period, σTThe standard deviation of the extraction period.
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