KR102536005B1 - Method and Apparatus for Setting Reception Threshold in Backscatter Communication - Google Patents

Abstract

Disclosed is a reception threshold setting method in backscatter communication and a device therefor, which can reduce an error that occurs when interpreting received information and prevent transmission delays that occurs due to the error. The reception threshold setting method according to an embodiment of the present invention may comprise: a signal acquisition step of acquiring at least one received signal; a threshold setting step of calculating and setting a reception threshold based on signal measurement values of each of the at least one received signal; a measurement value prediction processing step of calculating a signal measurement prediction value for each of at least one expected reception signal based on a learning model previously learned by inputting pre-stored reception history information; an error determination step of comparing the reception threshold and the signal measurement prediction value to determine occurrence of a signal interpretation error; and a signal reception processing step of setting a final reception threshold for signal reception using the reception threshold according to the result of determination on the signal interpretation error.

Description

Method and apparatus for setting reception threshold in backscatter communication {Method and Apparatus for Setting Reception Threshold in Backscatter Communication}

The present invention relates to a method for setting a reception threshold of a receiving terminal in backscatter communication and an apparatus therefor. Research on the present invention is related to the research results of the SW-centered university support project of the Ministry of Science and ICT and the Information and Communication Technology Promotion Center (No. 2017-0-00096).

The contents described in this section simply provide background information on the embodiments of the present invention and do not constitute prior art.

In general, in backscatter communication, a backscatter tag reflects or absorbs a wireless signal in the air to generate information and transmit it to a receiving terminal. Then, based on the preset threshold, the receiving terminal interprets the signal as a reflected signal when the voltage of the signal is greater than the threshold, interprets the signal as an absorbed signal when the voltage of the signal is less than the preset threshold, and interprets the received information. . At this time, when the voltage of the reflected signal is less than the set threshold or when the voltage of the absorbed signal is greater than the set threshold, an error occurs in information interpretation. In a backscatter communication environment, errors often occur because the voltage of a signal frequently changes.

The threshold in the conventional backscatter communication is set by transferring control packets of 1 and 0 before data is transmitted. Afterwards, when the received information is interpreted with the set threshold, if an error occurs during information interpretation due to the above situation, the control packet of 1 and 0 is sent again to reset the threshold. However, there are problems in that network overhead and transmission delay occur due to the process of resetting the threshold.

In the present invention, in a method in which a receiving terminal analyzes a received signal in backscatter communication, a reception threshold is set using a signal measurement value of a received signal, and a signal interpretation error occurs based on the signal measurement prediction value predicted for the received signal. The main object of the present invention is to provide a method for setting a reception threshold in backscatter communication and an apparatus for the same in which the final reception threshold is set by determining whether or not.

According to one aspect of the present invention, in a method for setting a reception threshold in a receiving terminal of a backscatter communication system for achieving the above object, the method for setting the reception threshold includes a signal acquisition step of acquiring at least one received signal. ; a threshold value setting step of calculating and setting a reception threshold based on a signal measurement value of each of the at least one received signal; a measurement value prediction processing step of calculating a signal measurement prediction value of each of the at least one expected reception signal based on a pre-learned learning model by inputting pre-stored reception history information; an error determination step of determining whether a signal interpretation error has occurred by comparing the reception threshold with the predicted signal measurement value; and a signal reception processing step of setting a final reception threshold for signal reception using the reception threshold according to a result of determining a signal interpretation error.

In addition, according to another aspect of the present invention, in the apparatus for setting the reception threshold in a backscatter communication system for achieving the above object, the reception terminal includes: a signal acquisition unit for acquiring at least one received signal; a threshold setting unit that calculates and sets a reception threshold based on a signal measurement value of each of the at least one received signal; a measurement value prediction processing unit that calculates a signal measurement prediction value of each of at least one expected reception signal based on a pre-learned learning model by inputting pre-stored reception history information; an error determining unit comparing the reception threshold with the predicted signal measurement value to determine whether a signal interpretation error has occurred; and a signal reception processor configured to set a final reception threshold for signal reception using the reception threshold according to a result of determining a signal interpretation error.

As described above, the present invention has an effect of reducing an error rate occurring when interpreting received information in a receiving terminal and preventing transmission delay occurring in a process of resetting a threshold due to an error occurrence.

In addition, the present invention has an effect of reducing network overhead by enabling signal reception by setting a threshold value without sending unnecessary control packets.

1 is a schematic block diagram of a backscatter communication system according to an embodiment of the present invention.
2 is a schematic block diagram of a receiving terminal according to an embodiment of the present invention.
3 is a flowchart illustrating a method of setting a reception threshold in backscatter communication according to an embodiment of the present invention.
4 is a schematic block diagram of a receiving terminal according to another embodiment of the present invention.
5 is an exemplary diagram for explaining a reception threshold setting operation according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted. In addition, although preferred embodiments of the present invention will be described below, the technical idea of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art. Hereinafter, a reception threshold setting method and apparatus for backscatter communication proposed in the present invention will be described in detail with reference to the drawings.

1 is a schematic block diagram of a backscatter communication system according to an embodiment of the present invention.

The backscatter communication system according to the present embodiment includes a transmitting terminal 110 , a tag 120 and a receiving terminal 130 . The backscatter communication system of FIG. 1 is according to an embodiment, and all blocks shown in FIG. 1 are not essential components, and in another embodiment, some blocks included in the backscatter communication system may be added, changed, or deleted. there is.

The transmitting terminal 110 performs an operation of radiating an RF signal, which is a background radio wave signal. The transmitting terminal 110 may transmit background radio signals such as TV signals, Bluetooth signals, LoRA signals, base station signals, radio signals, Wi-Fi signals, and sine wave signals, and various types of RF signals emitted from nearby electronic devices. It may be a device that provides.

The transmitter terminal 110 may be implemented as a plurality of terminals, and may be an electronic device such as a Wi-Fi access point (AP), a UHD TV tower, etc. deployed in daily life.

The tag 120 is a backscatter (backscatter) tag, and performs an operation of transmitting data with ultra-low power consumption.

The tag 120 utilizes the RF signal emitted from the transmitting terminal 110 as a source of wireless communication and modulates and reflects the signal emitted from the transmitting terminal 110 through backscatter communication with its own sensor data information. It can be implemented as a circuit capable of performing

The tag 120 may absorb an RF signal or output a signal generated by modulating the RF signal.

The receiving terminal 130 receives signals from the transmitting terminal 110, the tag 120, and the like, analyzes the received signals, and derives data.

The receiving terminal 130 may set the receiving threshold using signal measurement values (eg, voltage, signal strength, amplitude) of the received signal received through backscatter communication.

The receiving terminal 130 decodes the received signal to derive data for the received signal transmitted by the tag 120. In particular, the receiving terminal 130 derives data by comparing the measured signal value with the reception threshold value and declaring 1 or 0.

Hereinafter, the operation of the backscatter communication system according to the present embodiment will be described.

The backscatter communication system of the present invention sets a reception threshold using a signal measurement value of a received signal for a method of interpreting information on a signal received by the receiving terminal 130 in backscatter communication using a background radio wave signal, We propose a method of determining whether to adjust the reception threshold by predicting the received signal using a recurrent neural network (eg LSTM algorithm).

Backscatter communication is performed as follows. The backscatter tag 120 reflects or absorbs a radio signal in the air to generate information and transmits the information to the receiving device 130 . Then, based on the preset reception threshold, the receiving terminal 130 interprets the signal as a reflected signal if the voltage of the signal is greater than the reception threshold, and interprets it as an absorbed signal if the voltage of the signal is less than the preset reception threshold. to interpret the received information.

Unlike conventional backscatter communication that transmits control packets when setting the reception threshold, the algorithm for predicting the received signal voltage proposed in the present invention measures the signal measurement values (e.g., voltage, signal strength, amplitude) of the signal received through data transmission. ) to set the reception threshold.

Specifically, a received signal obtained by combining a signal transmitted from the transmitting terminal 110 with a signal reflected from the tag 120 and a signal transmitted from the transmitting terminal 110 is referred to as a reflected signal, and a signal transmitted from the transmitting terminal 110 If an absorption signal is a received signal meaning only a signal absorbed by the tag 120 and transmitted from the transmitting terminal 110, the receiving terminal 130 calculates the average of the signal measurement values of the reflected signal and the absorption signal to obtain a reception threshold set

At this time, the receiving terminal 130 predicts the signal measurement value of the received signal and, if an error occurs when interpreting it with a previously set reception threshold, resets the reception threshold so that the error does not occur.

In the reception threshold setting algorithm according to the reception signal analysis procedure of the reception terminal 130, a learning model may be created using an LSTM algorithm for learning time series data. In the backscatter communication environment, since the measured signal value of the signal changes irregularly, a lot of data is needed to analyze the changing pattern of the measured signal value in order to make a highly accurate prediction. Since the ability to learn even on historical data is maintained, LSTM algorithms can be used to create learning models.

A received signal analysis procedure of the receiving terminal 130 according to the present embodiment is as follows. Here, the signal measurement value will be described assuming that it is a measurement value for voltage.

1) Setting a reception threshold by using the voltage of the reception signal first received by the reception terminal 130

2) Predicting the voltage of the signal to be received after setting the reception threshold

3) Determining whether a signal interpretation error has occurred by comparing the set reception threshold with the predicted signal voltage prediction value

4) Receiving a signal according to resetting the reception threshold or setting the final reception threshold according to whether a signal interpretation error occurs

Hereinafter, the step of setting the reception threshold using the voltage of the reception signal first received by the reception terminal 130 will be described.

In the step of setting the reception threshold using the voltage of the reception signal first received by the reception terminal 130, when the tag 120 reflects the signal transmitted from the transmission terminal 110, the reception terminal 130 A signal obtained by adding the background radio wave signal transmitted from the transmitting terminal 110 and the signal reflected from the tag 120 is received. Conversely, when the tag 120 absorbs the signal transmitted from the transmitting terminal 110, the receiving terminal 130 receives only the background radio signal transmitted from the transmitting terminal 110. At this time, the reception terminal 130 determines a signal using the voltage difference between the two signals, and sets the reception threshold to have the average value of the voltages of the two signals.

Hereinafter, the step of estimating the voltage of a signal to be received after setting the reception threshold will be described.

The receiving terminal 130 predicts the voltage of a signal to be received in the future using the LSTM algorithm. After analyzing the changing aspect of the signal voltage using the data stored in the voltage of the previously received signal, the voltage of the signal to be received is predicted before the actual signal is received. Here, predicting the signal to be received is not predicting whether the signal reflected from the tag 120 and the background radio signal are combined (signal meaning 1) or the background radio signal (signal meaning 0), but two It means predicting the voltage of each signal.

Hereinafter, a step of determining whether or not a signal analysis error has occurred by comparing the set reception threshold with the predicted signal voltage prediction value will be described.

Thereafter, the reception terminal 130 compares the predicted signal voltage with a currently set reception threshold to predict whether an error occurs in signal analysis. Specifically, if the voltage of the signal reflected from the tag 120 plus the background radio wave signal is smaller than the reception threshold or the voltage of the background radio wave signal is larger than the reception threshold, it is predicted that an error will occur. It is predicted that the signal interpretation is performed normally.

Hereinafter, a signal reception step according to resetting the reception threshold value or setting the final reception threshold value according to whether a signal analysis error occurs will be described.

Thereafter, the receiving terminal 130 receives a signal when it is predicted that the signal analysis is performed normally without an error, and when it is predicted that an error occurs, the threshold value is reset to the average value of the two signals predicted above. , receive the signal. It is to reset the threshold value before receiving the signal so that no error occurs.

The receiving terminal 130 may repeatedly perform the above-described received signal analysis procedure whenever a received signal is received.

2 is a schematic block diagram of a receiving terminal according to an embodiment of the present invention.

The reception terminal 130 according to the present embodiment includes an initial reception signal acquisition unit 210, a threshold value setting unit 220, a measurement value prediction unit 230, a measurement value prediction learning processing unit 232, and an error determination unit 240. ), a threshold adjustment unit 250 and a signal reception processing unit 260. The receiving terminal 130 of FIG. 2 is according to an embodiment, and all blocks shown in FIG. 2 are not essential components, and some blocks included in the receiving terminal 130 in another embodiment are added, changed, or deleted. It can be. That is, in FIG. 2, the configuration for adjusting or setting the reception threshold in the reception terminal 130 is mainly described, and configurations such as a decoding module and an amplification module for receiving a received signal are generally omitted.

The reception terminal 130 according to the present embodiment sets a reception threshold using a signal measurement value of the received signal for a method of interpreting information on a signal received in backscatter communication using a background propagation signal and uses a recurrent neural network ( Example: LSTM algorithm) is used to predict the received signal to determine whether to adjust the reception threshold. Hereinafter, each component included in the receiving terminal 130 will be described.

The initial received signal acquisition unit 210 acquires at least one received signal.

The initial received signal acquisition unit 210 includes a first received signal (absorption signal) transmitted from the transmitting terminal 110 and a second received signal (reflected) obtained by combining the first received signal and the signal obtained by reflecting the first received signal by the tag. signal) may be obtained.

The initial received signal acquisition unit 210 may randomly acquire the first received signal and the second received signal, and may perform a signal acquisition operation until both the first received signal and the second received signal are received. .

The threshold setting unit 220 calculates and sets a reception threshold based on the signal measurement value of each of the at least one received signal.

The threshold setting unit 220 calculates an average of signal measurement values of the first received signal and the second received signal, and sets the average of the signal measurement values as a reception threshold. Here, the signal measurement value may be a value obtained by measuring at least one of voltage, signal strength, and amplitude of the received signal, but is not necessarily limited thereto, and may be a value obtained by measuring other signal characteristics if the reception threshold of the received signal can be calculated. there is.

The measurement value prediction unit 230 calculates a signal measurement prediction value based on the pre-learned learning model. The measurement value prediction unit 230 may calculate a signal measurement prediction value of each of the at least one expected received signal by applying the learned learning model to the previously stored reception history information as an input. Here, at least one expected received signal is selected or selected based on a signal (absorption signal) stored in the signal form of the first received signal, a signal (reflected signal) stored in the form of a second received signal, etc. in pre-stored reception history information. It may be an extracted signal.

The measured value prediction unit 230 is a first signal measurement prediction value corresponding to the first received signal (absorption signal) among the previous received signals and a second signal measurement prediction value corresponding to the second received signal (reflection signal) among the previous received signals. can be calculated.

The measurement value prediction unit 230 may calculate a signal measurement prediction value by applying the learning model generated by the measurement value prediction learning processing unit 232 .

The measurement value prediction learning processing unit 232 generates a learning model that has performed learning using reception history information on signal measurement values of at least one previously received signal as an input. Here, the at least one previous received signal means a first received signal and a second received signal received during a preset period. Information storing signal measurement values of each of at least one previously received signal may be defined as reception history information. The reception history information may be stored in an internal or external storage of the receiving terminal 130 .

The measurement value prediction learning processing unit 232 transfers the generated learning model to the measurement value prediction unit 230 so that a signal measurement prediction value of each of at least one expected received signal is calculated. The learning model generated by the measurement value prediction learning processing unit 232 is preferably a long short-term memory (LSTM)-based recurrent neural network, but is not necessarily limited thereto.

The error determination unit 240 determines whether a signal analysis error has occurred by comparing the reception threshold with the predicted signal measurement value. Specifically, the error determination unit 240 compares the reception threshold with the first signal measurement prediction value and the second signal measurement prediction value, respectively, to determine whether a signal interpretation error has occurred.

The error determining unit 240 determines that a signal interpretation error has not occurred when it is determined that the first signal measurement prediction value is less than or equal to the reception threshold and the second signal measurement prediction value is greater than or equal to the reception threshold.

Meanwhile, the error determining unit 240 determines that a signal interpretation error has occurred when it is determined that the first signal measurement prediction value exceeds the reception threshold or the second signal measurement prediction value is less than the reception threshold. In other words, the error determination unit 240 determines that a signal interpretation error has occurred when at least one or all signal measurement prediction values of the first signal measurement prediction value and the second signal measurement prediction value do not satisfy the reception threshold.

When it is determined that a signal analysis error has occurred, the threshold adjusting unit 250 calculates an average of the first signal measurement prediction value and the second signal measurement prediction value and adjusts the reception threshold value. If a signal interpretation error occurs even after applying the adjusted reception threshold, the threshold adjustment unit 250 may repeatedly perform an operation of adjusting the reception threshold.

Although the threshold adjustment unit 250 is shown as a separate module from the signal reception processing unit 260, it is not necessarily limited thereto, and is implemented in a form included in the signal reception processing unit 260 or an operation of adjusting the reception threshold. may be processed by the signal reception processing unit 260.

The signal reception processing unit 260 sets a final reception threshold for signal reception using the reception threshold according to the determination result of the signal interpretation error.

When it is determined that no signal interpretation error has occurred, the signal reception processing unit 260 sets the corresponding reception threshold as the final reception threshold. The signal reception processing unit 260 performs reception processing of a new reception signal based on the set final reception threshold.

3 is a flowchart illustrating a method of setting a reception threshold in backscatter communication according to an embodiment of the present invention.

The receiving terminal 130 acquires at least one received signal (S310). The receiving terminal 130 receives a first received signal (absorption signal) transmitted from the transmitting terminal 110 and a second received signal (reflection signal) obtained by combining the signal reflected by the tag and the first received signal. It is possible to obtain at least one received signal including.

The receiving terminal 130 calculates and sets a reception threshold based on the signal measurement value of each of the at least one received signal (S320). The receiving terminal 130 calculates an average of signal measurement values of the first received signal and the second received signal, and sets the average of the signal measurement values as a reception threshold.

The receiving terminal 130 calculates a predicted signal measurement value based on the pre-learned learning model (S330). The receiving terminal 130 may calculate a signal measurement prediction value of each of the at least one expected received signal by applying the learned learning model to the pre-stored reception history information as an input.

The receiving terminal 130 compares the reception threshold with the predicted signal measurement value to determine whether a signal interpretation error has occurred (S340). Specifically, the receiving terminal 130 compares the reception threshold with the first signal measurement prediction value and the second signal measurement prediction value, respectively, to determine whether a signal interpretation error has occurred.

The receiving terminal 130 determines that a signal interpretation error has occurred when it is confirmed that the first signal measurement prediction value exceeds the reception threshold or the second signal measurement prediction value is less than the reception threshold.

Meanwhile, if the receiving terminal 130 determines that the first signal measurement prediction value is less than or equal to the reception threshold and the second signal measurement prediction value is greater than or equal to the reception threshold, it is determined that a signal interpretation error has not occurred.

When it is determined that a signal analysis error has occurred (S342), the receiving terminal 130 calculates an average of the first signal measurement prediction value and the second signal measurement prediction value and adjusts the reception threshold (S350). If a signal interpretation error occurs even after applying the adjusted reception threshold, the receiving terminal 130 may repeatedly perform an operation of adjusting the reception threshold.

When it is determined that no signal interpretation error has occurred (S342), the receiving terminal 130 sets the corresponding reception threshold as the final reception threshold, and performs reception processing of a new received signal based on the set final reception threshold. to be (S360).

In FIG. 3, it is described that each step is sequentially executed, but is not necessarily limited thereto. In other words, since it will be applicable to changing and executing the steps described in FIG. 3 or executing one or more steps in parallel, FIG. 3 is not limited to a time-series sequence.

The reception threshold setting method according to the present embodiment described in FIG. 3 may be implemented as an application (or program) and recorded on a recording medium readable by a terminal device (or computer). All types of recording media in which an application (or program) for implementing the method for setting a reception threshold according to the present embodiment is recorded and a recording medium readable by a terminal device (or computer) stores data that can be read by a computing system. Including devices or media.

4 is a schematic block diagram of a receiving terminal according to another embodiment of the present invention.

The receiving terminal 130 according to another embodiment of the present invention may adjust the reception threshold by additionally considering the validity period of the reception threshold.

The receiving terminal 130 according to another embodiment of the present invention further includes a threshold valid period setting unit 252 connected to the threshold adjusting unit 250 . In FIG. 4, a description of a configuration overlapping with the configuration of the receiving terminal 130 described in FIG. 2 will be omitted, and description will focus on operations in which the validity period of the reception threshold is additionally considered.

The threshold adjustment unit 250 adjusts the reception threshold based on at least one condition of whether or not a signal interpretation error of the adjusted reception threshold occurs, a valid period of the reception threshold, an adjustment frequency of the reception threshold, and an adjustment pattern of the reception threshold. can be adjusted.

The threshold adjustment unit 250 may repeat an operation of additionally adjusting the set reception threshold when a signal interpretation error of the pre-adjusted reception threshold additionally occurs.

Also, the threshold adjustment unit 250 may obtain information about the effective period of the reception threshold from the threshold validity period setting unit 252 and adjust the reception threshold for each effective period of the reception threshold.

The threshold validity period setting unit 252 may determine the validity period of the initial threshold value based on the waveform shape of the received signal acquired by the initial received signal acquisition unit 210 .

The threshold valid period setting unit 252 may determine the valid period of the initial threshold by adjusting a preset basic effective period of the received signal according to the waveform shape of the received signal. That is, the threshold valid period setting unit 252 may increase or decrease the basic valid period depending on whether the received signal is a sinusoidal wave (sine wave), a signal with rapid waveform fluctuation (Wi-Fi signal), etc. .

For example, the threshold valid period setting unit 252 may determine the effective period of the reception threshold by reducing the basic valid period when a signal with rapid fluctuation, such as a Wi-Fi signal, is used as the received signal. Meanwhile, the threshold valid period setting unit 252 may determine the effective period of the reception threshold by increasing the basic effective period when a simple tone received signal such as a sine wave is used.

When the threshold adjustment unit 250 obtains information on the effective period of the reception threshold from the threshold validity period setting unit 252, the threshold adjustment unit 250 receives reception even if a signal interpretation error according to the reception threshold does not occur. Performs an operation to adjust the threshold value.

Meanwhile, the threshold adjusting unit 250 may adjust the reception threshold in consideration of additional conditions such as an adjustment frequency of the reception threshold and an adjustment pattern of the reception threshold within an effective period of the reception threshold. A description of an operation of adjusting the reception threshold in consideration of additional conditions is described in FIG. 5 .

5 is an exemplary diagram for explaining a reception threshold setting operation according to another embodiment of the present invention.

The threshold adjustment unit 250 sets the reception threshold in consideration of one additional condition or a combination of a plurality of conditions, such as an adjustment frequency of the reception threshold or an adjustment pattern of the reception threshold within the effective period of the reception threshold. can be adjusted

5(a) is a diagram for explaining an operation of adjusting a reception threshold according to an additional condition according to an adjustment pattern of a reception threshold within an effective period of the reception threshold.

As shown in (a) of FIG. 5, the threshold adjustment unit 250 continuously adjusts the reception threshold more than a predetermined reference number within the effective period 510 of the reception threshold (512, 514, 516). When the pattern is confirmed, the reception threshold may be adjusted by assigning weights to the signal measurement value and signal measurement prediction value of the received signal.

On the other hand, the threshold adjustment unit 250, when a pattern in which the reception threshold is continuously adjusted for more than a predetermined reference number within the effective period 510 of the reception threshold is confirmed, the newly obtained signal measurement value of the received signal and The reception threshold may be newly recalculated using the newly predicted signal measurement predicted value.

5(b) is a diagram for explaining an operation of adjusting the reception threshold according to an additional condition according to the frequency of adjustment of the reception threshold within the effective period of the reception threshold.

As shown in (b) of FIG. 5, the threshold adjustment unit 250 adjusts the reception threshold more than a predetermined reference number within the effective period 520 of the reception threshold (522, 524, 528), The reception threshold may be adjusted by assigning a weight to a signal measurement value and a signal measurement prediction value of the received signal.

Meanwhile, the threshold adjusting unit 250 measures a signal measurement value of a newly obtained received signal and a newly predicted signal when the reception threshold is adjusted more than a predetermined reference number within the effective period 510 of the reception threshold. A reception threshold may be newly recalculated using the predicted value.

The above description is only illustrative of the technical idea of the embodiment of the present invention, and those skilled in the art to which the embodiment of the present invention belongs can make various modifications and modifications within the scope not departing from the essential characteristics of the embodiment of the present invention. transformation will be possible. Therefore, the embodiments of the present invention are not intended to limit the technical idea of the embodiment of the present invention, but to explain, and the scope of the technical idea of the embodiment of the present invention is not limited by these examples. The protection scope of the embodiments of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the embodiments of the present invention.

110: transmitting terminal 120: tag
130: receiving terminal
210: initial received signal acquisition unit 220: threshold value setting unit
230: measurement value prediction unit 232: measurement value prediction learning processing unit
240: error determination unit 250: threshold adjustment unit
260: signal reception processing unit

Claims (15)

A method for setting a reception threshold in a receiving terminal of a backscatter communication system,
a signal acquisition step of obtaining at least one received signal;
a threshold value setting step of calculating and setting a reception threshold based on a signal measurement value of each of the at least one received signal;
a measurement value prediction processing step of calculating a signal measurement prediction value of each of the at least one expected reception signal based on a pre-learned learning model by inputting pre-stored reception history information;
an error determination step of determining whether a signal interpretation error has occurred by comparing the reception threshold with the predicted signal measurement value; and
A signal reception processing step of setting a final reception threshold for signal reception using the reception threshold according to a result of determining a signal interpretation error.
A reception threshold setting method comprising a. According to claim 1,
The signal acquisition step,
Acquiring the at least one received signal including a first received signal transmitted from a transmitting terminal and a second received signal obtained by combining a signal reflected by a tag with the first received signal and the first received signal How to set the receive threshold. According to claim 2,
In the threshold setting step,
The reception threshold setting method of claim 1, wherein an average of measurement values of each of the first received signal and the second received signal is calculated as the reception threshold. According to claim 2,
The measurement value prediction processing step,
A reception threshold setting method comprising: calculating a first signal measurement prediction value corresponding to the first reception signal among previous reception signals and a second signal measurement prediction value corresponding to the second reception signal among previous reception signals. According to claim 1,
In the measurement value prediction processing step,
Calculate the signal measurement predicted value by applying the learning model that has been learned by taking the reception history information for the signal measurement value of at least one previous received signal as an input,
The learning model is a reception threshold setting method, characterized in that generated by a recurrent neural network based on long short-term memory (LSTM). According to claim 4,
The error determination step,
The method of setting a reception threshold, characterized in that determining whether a signal analysis error occurs by comparing the reception threshold with the first signal measurement prediction value and the second signal measurement prediction value, respectively. According to claim 6,
The error determination step,
When it is confirmed that the first signal measurement prediction value is less than or equal to the reception threshold and the second signal measurement prediction value is greater than or equal to the reception threshold, it is determined that the signal interpretation error has not occurred. According to claim 7,
The signal reception processing step,
When it is determined that the signal interpretation error does not occur, the reception threshold is set as the final reception threshold, and reception processing of a new received signal is performed based on the set final reception threshold. How to set the receive threshold. According to claim 6,
The error determination step,
If it is confirmed that the first signal measurement prediction value exceeds the reception threshold value or the second signal measurement prediction value is less than the reception threshold value, it is determined that the signal interpretation error has occurred. According to claim 9,
The signal reception processing step,
When it is determined that the signal analysis error has occurred, an operation of adjusting the reception threshold by calculating an average of the first signal measurement prediction value and the second signal measurement prediction value is repeatedly performed. method. According to claim 10,
The signal reception processing step,
The final reception threshold is set based on at least one condition of whether or not a signal interpretation error of the adjusted reception threshold occurs, an effective period of the reception threshold, an adjustment frequency of the reception threshold, and an adjustment pattern of the reception threshold. A method for setting a reception threshold, characterized in that for. An apparatus for setting a reception threshold in a backscatter communication system,
a signal acquisition unit that acquires at least one received signal;
a threshold setting unit that calculates and sets a reception threshold based on a signal measurement value of each of the at least one received signal;
a measurement value prediction processing unit that calculates a signal measurement prediction value of each of at least one expected reception signal based on a pre-learned learning model by inputting pre-stored reception history information;
an error determining unit comparing the reception threshold with the predicted signal measurement value to determine whether a signal interpretation error has occurred; and
A signal reception processing unit for setting a final reception threshold for signal reception using the reception threshold according to a result of determining a signal interpretation error
A receiving terminal comprising a. According to claim 12,
The signal acquisition unit,
obtaining the at least one received signal including a first received signal transmitted from a transmitting terminal and a second received signal obtained by combining a signal reflected by a tag with the first received signal and the first received signal;
The measurement value prediction processing unit calculates a first signal measurement prediction value corresponding to the first received signal among previous received signals and a second signal measurement prediction value corresponding to the second received signal among previous received signals. Characterized in that receiving terminal. According to claim 13,
The error determination unit,
When the reception threshold is compared with the first signal measurement prediction value and the second signal measurement prediction value, respectively, and it is determined that the first signal measurement prediction value is less than or equal to the reception threshold value and the second signal measurement prediction value is greater than or equal to the reception threshold value , It is determined that the signal interpretation error has not occurred,
When it is determined that the signal interpretation error does not occur, the signal reception processing unit sets the reception threshold as the final reception threshold and performs reception processing of a new received signal based on the set final reception threshold. A receiving terminal characterized in that for doing. According to claim 13,
The error determination unit,
Comparing the reception threshold with the first signal measurement prediction value and the second signal measurement prediction value, respectively, confirming that the first signal measurement prediction value exceeds the reception threshold value or the second signal measurement prediction value is less than the reception threshold value If so, it is determined that the signal interpretation error has occurred,
When it is determined that the signal interpretation error has occurred, the signal reception processing unit calculates an average of the first signal measurement prediction value and the second signal measurement prediction value and repeatedly performs an operation of adjusting the reception threshold value. The receiving terminal to be.

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