KR20230069401A - Receiving apparatus and operating method thereof - Google Patents

Abstract

A receiving device according to various embodiments is disclosed. A receiving device according to various embodiments converts an RF signal received through antennas into a first signal, obtains a first energy vector for a signal in a first slot among the first signals, and obtains a plurality of OFDM signals in the first slot. The first energy vector is obtained by calculating a signal energy value in each of the symbols, a first cumulative sum vector for the obtained first energy vector is determined, and a first cumulative sum vector is determined based on the determined first cumulative sum vector. A change point is determined, a second energy vector is obtained by performing a cyclic shift on the first energy vector, a second cumulative sum vector for the obtained second energy vector is determined, and the determined second cumulative sum vector is determined. A second change point may be determined based on , and an OFDM symbol determined to have a mini-slot interference signal may be detected among the OFDM symbols based on the determined first and second change points.

Description

Receiving device and its operating method {RECEIVING APPARATUS AND OPERATING METHOD THEREOF}

Various embodiments relate to a receiving device and an operating method thereof.

In 5G mobile communication, a mini-slot standard having a small orthogonal frequency-division multiplexing (OFDM) symbol length is used to implement low latency technology. A mini-slot starts at any OFDM symbol position within a slot and ends within that slot, and may have a length of 2, 4, or 7 OFDM symbols. In this case, when a signal corresponding to a mini-slot of an adjacent cell is received as an uplink interference signal of a base station, various interference patterns may occur. A "signal corresponding to a mini-slot" received by the base station from an adjacent cell may act as a "mini-slot interference signal" in the base station. Since an OFDM symbol position where a mini-slot interference signal exists may change every time, a new type of interference pattern may exist in every slot.

If the frequency band to which the mini-slot interference signal is allocated is not synchronized with the frequency band of the signal to be received by the base station, interference may exist in a specific frequency band. When a base station cannot respond to a mini-slot interference signal strongly received from an adjacent cell, receiver performance of the base station may be degraded in an OFDM symbol position and frequency band where the mini-slot interference signal exists. In order to respond to the mini-slot interference signal, it may be important for the receiver to know the position of the OFDM symbol and the frequency band in which the mini-slot interference signal exists.

Various embodiments may provide a receiving apparatus for estimating an OFDM symbol position where a mini-slot interference signal exists and a frequency band where a mini-slot interference signal exists within one slot with low complexity and high accuracy.

Various embodiments may provide a receiving device capable of detecting and mitigating a mini-slot interference signal in a time-frequency axis in order to respond to the mini-slot interference signal.

The technical problem to be achieved in this document is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. will be.

A receiving device according to various embodiments includes a plurality of antennas, an RF transceiver converting an RF signal received through the antennas into a first signal, and obtaining a first energy vector for a signal of a first slot among the first signals However, a signal energy value in each of a plurality of OFDM symbols in the first slot is calculated to obtain the first energy vector, a first cumulative sum vector for the obtained first energy vector is determined, and the determined first energy vector is determined. A first change point is determined based on 1 cumulative sum vector, a second energy vector is obtained by performing a cyclic shift on the first energy vector, and a second cumulative sum vector for the obtained second energy vector is determined. and determines a second change point based on the determined second cumulative sum vector, and selects an OFDM symbol determined to have a mini-slot interference signal among the OFDM symbols based on the determined first and second change points. It may include a processor that detects.

A method of operating a receiving device according to various embodiments includes converting an RF signal received through a plurality of antennas into a first signal, obtaining a first energy vector for a signal of a first slot among the first signals, and Obtaining the first energy vector by calculating a signal energy value in each of a plurality of OFDM symbols in one slot, determining a first cumulative sum vector for the obtained first energy vector, Determining a first change point based on the cumulative sum vector, obtaining a second energy vector by performing a cyclic shift on the first energy vector, and obtaining a second cumulative sum vector for the obtained second energy vector. Determining a second change point based on the determined second cumulative sum vector, and determining that a mini-slot interference signal exists among the OFDM symbols based on the determined first and second change points It may include an operation of detecting an OFDM symbol that is.

When a mini-slot interference signal is received in an uplink, a receiving apparatus according to various embodiments may estimate an OFDM symbol location and a frequency band in a slot in which a mini-slot interference signal exists with low complexity and high accuracy.

In addition to this, various effects identified directly or indirectly through this document may be provided.

1 is a diagram for explaining an example of a wireless communication system according to various embodiments.
2 illustrates an example of a mini-slot interference pattern when a numerology is 1, according to various embodiments.
3 to 6 are block diagrams for explaining a receiving device according to various embodiments.
7 to 10 are diagrams for explaining mini-slot interference pattern detection by a receiving apparatus according to various embodiments.
FIG. 11 is a diagram for describing performance of a receiving apparatus for detecting a mini-slot interference pattern, according to various embodiments.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted.

1 and 2 are diagrams for explaining an example of a wireless communication system according to various embodiments.

1 illustrates a receiving device 110 and a transmitting device 120 as some of nodes using a radio channel in a wireless communication system.

The receiving device 110 may be, for example, a base station device, and the transmitting device 120 may be, for example, a user terminal. The transmitting device 120 may be referred to as a user equipment (UE), a mobile station, a subscriber station, a remote terminal, or a wireless terminal.

1 shows one receiving device 110 and one transmitting device 120, but this is merely an example, and a wireless communication system may include a plurality of receiving devices and a plurality of transmitting devices.

According to various embodiments, the receiving device 110 may receive an RF signal (or an uplink signal) from the transmitting device 120 . When receiving an RF signal, the receiving device 110 may receive a signal corresponding to a mini-slot from a device in an adjacent cell. In the receiving device 110, a signal received from a device in a neighboring cell may act as interference, and various interference patterns may occur. A “signal corresponding to a mini-slot” received by the receiving device 110 from a device in a neighboring cell may be referred to as a “mini-slot interference signal”.

According to various embodiments, the receiving device 110 may detect a mini-slot interference pattern within one slot. The receiving device 110 may determine an OFDM symbol location and a frequency band in which a mini-slot interference signal exists within one slot. Also, the receiving device 110 can improve communication performance by mitigating the mini-slot interference signal.

According to various embodiments, the receiving device 110 receives information about scheduling of mini-slots in which a mini-slot interference signal is strongly introduced into a slot in a specific frequency band and a base station using multiple antennas is present in a neighboring cell and mini-slots. -If information on a reference signal (DMRS) present in a signal corresponding to a slot is not known, an OFDM symbol position and frequency band in which a mini-slot interference signal exists may be identified.

According to various embodiments, the receiving device 110 strongly introduces a mini-slot interference signal within a slot in a specific frequency band, and when a base station using multiple antennas receives an uplink signal, neighbor cell interference flows, and mini-slot When an interference signal starts from an arbitrary OFDM symbol position in a slot and ends within a corresponding slot, the OFDM symbol position and frequency band in which the mini-slot interference signal exists can be identified.

2 illustrates an example of a mini-slot interference pattern when a numerology is 1, according to various embodiments.

In the example shown in FIG. 2, a mini-slot interference signal may exist in any OFDM symbol and any resource block within one slot.

According to various embodiments, the receiving device 110 may detect an OFDM symbol having a mini-slot interference signal within a resource block, and may perform such detection for each resource block. Through this, the receiving device 110 can estimate the OFDM symbol and frequency band in which the mini-slot interference signal exists.

According to various embodiments, a received signal model at each OFDM symbol position based on one resource block is as shown in Equation 1 below.

In Equation 1 above, k represents an OFDM symbol position (or an index of an OFDM symbol).

In one resource block, reception vectors of each of the 1st subcarrier to the 12th subcarrier may exist. In Equation 1 above, y ₁ [k] may represent the reception vector of the first subcarrier, y ₂ [k] may represent the reception vector of the second subcarrier, and y ₁₂ [k] may represent the 12th subcarrier A reception vector of a subcarrier may be indicated.

According to various embodiments, the size of the reception vector of each subcarrier may correspond to the number of reception antennas (N _R ) of the reception device 4110 .

According to various embodiments, a reception matrix having a reception vector of each subcarrier as each column vector may be a received signal model of each OFDM symbol.

According to various embodiments, the received signal model of each subcarrier in an OFDM symbol without a mini-slot is as shown in Equation 2 below, and the received signal model of each subcarrier in an OFDM symbol with a mini-slot is expressed by the following equation Same as Equation 3.

는 i번째 서브 캐리어와 k번째 OFDM 심볼에서 원하는(desired) 셀 채널 행렬을 나타낼 수 있고,

는 인접 셀 간섭 채널 행렬을 나타낼 수 있다. 위 수학식 2와 3에서,

는 i번째 서브 캐리어와 k번째 OFDM 심볼에서 desired 셀 송신 신호를 나타낼 수 있고,

는 인접 셀 간섭 신호를 나타낼 수 있다. 위 수학식 3에서,

는 미니-슬롯 간섭 채널 행렬을 나타낼 수 있고,

는 미니-슬롯 간섭 신호를 나타낼 수 있다.In Equations 2 and 3 above,

May represent a desired cell channel matrix in the i th subcarrier and the k th OFDM symbol,

May represent a neighboring cell interference channel matrix. In Equations 2 and 3 above,

May represent the desired cell transmission signal in the i th subcarrier and the k th OFDM symbol,

may represent an adjacent cell interference signal. In Equation 3 above,

may represent the mini-slot interference channel matrix,

may represent a mini-slot interference signal.

및

각각은

벡터일 수 있고,

및

각각은

행렬 및

행렬 각각일 수 있으며,

및

각각은

벡터 및

벡터 각각 일 수 있고,

는

벡터일 수 있다. N _R 은 앞서 설명한 것과 같이 수신 장치(110)의 수신 안테나들의 개수를 나타낼 수 있고, N _L 은 desired 셀 레이어의 개수를 나타낼 수 있으며,

은 인접 셀 레이어의 개수를 나타낼 수 있다.

and

each

can be a vector,

and

each

matrix and

Each matrix can be

and

each

vector and

Each can be a vector,

Is

can be a vector. As described above, N _R may represent the number of receiving antennas of the receiving device 110, N _L may represent the desired number of cell layers,

may represent the number of adjacent cell layers.

는 미니-슬롯이 존재하지 않는 OFDM 심볼 집합을 나타낼 수 있고, 위 수학식 3에서,

은 미니-슬롯이 존재하는 OFDM 심볼 집합을 나타낼 수 있다.In Equation 2 above,

May represent an OFDM symbol set in which a mini-slot does not exist, and in Equation 3 above,

may indicate a set of OFDM symbols in which mini-slots exist.

According to various embodiments, when the signal strength of the mini-slot is strong, the received signal strength of Equation 3 above may be greater than the received signal strength of Equation 2 above. Here, even within an OFDM symbol set divided according to the presence or absence of a mini-slot, the strength of a received signal may be different for each OFDM symbol. For example, since Gaussian noise may exist and the size of a channel coefficient may change in the case of a variable channel on the time axis, the strength of a received signal may be different for each OFDM symbol even within an OFDM symbol set divided according to the presence or absence of a mini-slot. Variation of energy may exist in two adjacent OFDM symbols. A change in energy at an OFDM symbol position where a mini-slot enters and an OFDM symbol position at which a mini-slot ends may be greater than a change at other positions. In an embodiment, the receiving device 110 may detect an OFDM symbol having mini-slot interference through an energy variation between adjacent OFDM symbols.

3 to 6 are block diagrams for explaining a receiving device according to various embodiments.

Referring to FIG. 3, a receiving device 300 (eg, the receiving device 110 of FIG. 1) includes a plurality of antennas 310-1 to 310-n, an RF transceiver 320, a processor 330, and A memory 340 may be included.

According to various embodiments, the RF transceiver 320 includes one or more transmit filters, one or more receive filters, one or more amplifiers, one or more mixers, one or more oscillators, one or more digital-to-analog converters (DACs), one or more ADCs ( analog-to-digital converter) and the like, but is not limited thereto.

According to various embodiments, the RF transceiver 320 may receive RF signals from one or more transmission devices through the plurality of antennas 310-1 to 310-n. The RF transceiver 320 may convert the RF signal into a first signal (eg, a baseband signal).

According to various embodiments, the processor 330 may receive the first signal from the RF transceiver 320 . The processor 330 may divide the first signal into OFDM symbol units, restore signals mapped to subcarriers through a fast Fourier transform (FFT) operation, and demodulate (or decode) the restored signals. It is possible to restore the data of the transmission device (eg, the transmission device 120 of FIG. 1) by performing.

According to various embodiments, the processor 330 may detect an OFDM symbol with a mini-slot interference signal in a first slot of the first signal, and detect an OFDM symbol with a mini-slot interference signal in the remaining slots as well. can do.

According to various embodiments, as in the example shown in FIG. 4 , the processor 330 may include a preprocessor 410 and a mini-slot interference detector 420 . Preprocessor 410 may calculate the energy vector z of a given input signal (eg, the received signal at each OFDM symbol in the first slot), and mini-slot interference detector 420 may compute the energy vector z ), it is possible to detect an OFDM symbol in which a mini-slot interference signal exists among OFDM symbols in a slot.

According to various embodiments, as in the example shown in FIG. 5, the preprocessor 410 calculates the energy vector ( z ) for the input signal ( Y [1] to Y [K]) 510 through Equation 4 below. (520) can be calculated. The size of the energy vector ( z ) 520 may have the length of the first slot.

는 프로베니우스 놈(Frobenius norm)을 나타낼 수 있다.In Equation 4 above,

may represent the Frobenius norm.

In the example shown in FIG. 5, the preprocessor 410 converts the Frobenius norm of the signal ( Y [1]) in the 1st OFDM symbol in the 1st slot to the signal energy value (z[1]) in the 1st OFDM symbol. can be determined by Similarly, the preprocessor 410 may determine the Frobenius norm of the signal in each of the remaining OFDM symbols as the signal energy value in each of the remaining OFDM symbols.

According to various embodiments, as in the example shown in FIG. 6, when the mini-slot interference detector 420 receives the energy vector ( z ) 520, a mini-slot interference signal among OFDM symbols in the first slot is An OFDM symbol determined to be present may be detected. The mini-slot interference detector 420 may output a first value (eg, 0) as shown in Equation 5 below when it is not detected (or estimated) that the mini-slot interference signal is present in the k-th OFDM symbol, and the k-th When it is detected (or estimated) that a mini-slot interference signal exists in an OFDM symbol, a second value (eg, 1) may be output as shown in Equation 5 below.

The mini-slot interference detector 420 may output a vector 610 indicating whether a mini-slot interference signal exists in each OFDM symbol of the first slot.

The receiving apparatus 300 detecting an OFDM symbol having a mini-slot interference signal will be described in detail with reference to FIG. 7 .

According to various embodiments, the memory 340 may store data such as a basic program for operation of the receiving device 300, an application program, and setting information. The memory 340 may store an execution result of the processor 330 .

According to various embodiments, the memory 340 may include a volatile memory, a non-volatile memory, or a combination of volatile and non-volatile memories. The memory 340 may provide stored data according to a request of the controller 340 of the processor 330 .

According to various embodiments, the receiving device 300 may include a backhaul communication unit (not shown) for communicating with other nodes (eg, neighboring base station devices). According to an embodiment, the processor 330 may implement a backhaul communication unit.

7 to 10 are diagrams for explaining mini-slot interference pattern detection by a receiving apparatus according to various embodiments.

Referring to FIG. 7 , in operation 701, the processor 330 may detect a first change point k ₁ . As will be described later, the first change point (k ₁ ) may belong to symbol positions of OFDM symbols in the first slot.

According to various embodiments, the processor 330 may receive a first signal from the RF transceiver 320, and a signal of a first slot among the first signals (eg, Y [1] to Y [K of FIG. 5) ]) 510), the first energy vector (eg, the energy vector z 520 of FIG. 5) may be calculated. For example, the processor 330 may calculate a first energy vector by calculating a signal energy value in each of the OFDM symbols in the first slot through Equation 4 above. An example of the first energy vector is shown in FIG. 8(a).

Returning to FIG. 7 , according to various embodiments, the processor 330 may determine a first cumulative sum (CUSUM) vector for the first energy vector. For example, the processor 330 may determine the first cumulative sum vectors s[1] to s[K] through Equation 6 below.

In Equation 6 above, μ _z may represent an average of signal energy values of K OFDM symbols in the first slot.

The processor 330 may calculate a first accumulated signal energy value of each of the OFDM symbols in the first slot by performing an accumulation sum on the signal energy values of each of the OFDM symbols in the first slot. The processor 330 calculates the first accumulated signal energy value (s[1]) of the 1st OFDM symbol in the 1st slot through Equation 6 above to the first accumulated signal energy value (s[K]) of the K-th OFDM symbol. can be calculated. The processor 330 may determine a first accumulated sum vector including each calculated first accumulated signal energy value.

In an embodiment, the processor 330 may determine (or detect) the first change point k ₁ based on the first cumulative sum vector. For example, the processor 330 may determine the first change point (k ₁ ) through Equation 7 below.

The processor 330 may determine, as the first change point _k 1 , the position of the OFDM symbol having the largest absolute value of each of the first accumulated signal energies s[1] to s[K]. In other words, the processor 330 determines the position of the OFDM symbol having the maximum among the absolute values of each of the first accumulated signal energy values s[1] to s[K] as the first change point k ₁ . there is. An example of the first cumulative sum vector is shown in FIG. 8(b). In the example shown in FIG. 8(b), the processor 330 has the maximum absolute value of the first accumulated signal energy value s[9] of the 9th OFDM symbol among the 14 OFDM symbols in the 1st slot, 9 may be determined as the first change point k ₁ . The processor 330 may determine k ₁ =9.

Returning to FIG. 7 , in operation 703 , the processor 330 may detect a second change point k ₂ . As will be described later, the second change point (k ₂ ) may correspond to any one of OFDM symbols in the first slot. In some cases, the second change point (k ₂ ) may not belong to OFDM symbols in the first slot.

According to various embodiments, the processor 330 may obtain a second energy vector by cyclically shifting the first energy vector through Equation 8 below.

The processor 330 determines that the first signal energy value (z[k ₁ +1]) in the OFDM symbol after the first change point (k ₁ ) becomes the first row (raw) and the first change point (k ₁ ) A cyclic shift may be performed on the first energy vector so that the first signal energy value (z[k ₁ ]) in is the last row. In the example shown in FIG. 8( b ), the total number of OFDM symbols in the first slot may be 14, and the first change point k ₁ may be 9. The processor 330 may calculate a difference value “5” between the total number of OFDM symbols and the first change point k ₁ , and determine the calculated difference value as a cyclic shift value. The processor 330 may obtain a second energy vector by cyclically shifting components in the first energy vector based on the cyclic shift value of “5”. An example of the second energy vector is shown in FIG. 9(a).

Returning to FIG. 7 , according to various embodiments, the processor 330 may calculate a second cumulative sum vector for the second energy vector. For example, the processor 330 may calculate the second cumulative sum vector through Equation 9 below.

) 내지 제2 누적 신호 에너지값(

)을 계산할 수 있다. 프로세서(330)는 각 계산된 제2 누적 신호 에너지값을 포함하는 제2 누적합 벡터를 결정할 수 있다.The processor 330 may calculate a second accumulated signal energy value at each of the cyclically shifted symbol positions by performing an accumulated sum on the signal energy values in the second energy vector. In other words, the processor 330 calculates the second accumulated signal energy value (through Equation 9 above).

) to the second accumulated signal energy value (

) can be calculated. The processor 330 may determine a second accumulated sum vector including each calculated second accumulated signal energy value.

The processor 330 may determine the second change point k ₂ through Equation 10 below.

When the first accumulated signal energy value (s[k ₁ ]) at the first change point (k ₁ ) is a positive number, the processor 330 determines the symbol position having the maximum among the absolute values of each of the second accumulated signal energy values. A difference value between the total number of OFDM symbols in the first slot (K) and the first change point (k ₁ ) may be calculated, and the calculated difference value may be subtracted from the checked symbol position to obtain a second change point. (k ₂ ) can be determined. In other words, the processor 330 may determine the second change point (k ₂ ) by subtracting the cyclic shift value from the checked symbol position. When the first accumulated signal energy value (s[k ₁ ]) at the first change point (k ₁ ) is a negative number, the processor 330 determines the symbol position having the maximum among the absolute values of each of the second accumulated signal energy values. It can be confirmed, and the second change point (k ₂ ) can be determined by adding the first change point (k ₁ ) to the checked symbol position.

An example of the second cumulative sum vector is shown in FIG. 9(b). In the example shown in FIG. 9( b ), the absolute value of the second accumulated signal energy value may be maximum at the cyclically shifted symbol position “7”. In the example shown in FIG. 8( b ), the first accumulated signal energy value s[9] at the first change point k ₁ may be a positive number. The processor 330 may calculate “5” by subtracting the first change point (k ₁ ) “9” from the total number of OFDM symbols “14” in the first slot, and calculate “5” at the cyclically shifted symbol position “7”. You can calculate "2" by subtracting 5". The processor 330 may determine “2” as the second change point k ₂ .

In one embodiment, the processor 330 may calculate a ratio between the energy change amount at the first change point (k ₁ ) and the energy change amount at the second change point (k ₂ ). The energy change at the first change point (k ₁ ) may represent the absolute value of the difference between z[k ₁ +1] and z[k ₁ ], and the energy change at the second change point (k ₂ ) may represent the absolute value of the difference between z[k ₂ +1] and z[k ₂ ]. The processor 330 may calculate a ratio (ratio ₁ ) between the energy change amount at the first change point (k ₁ ) and the energy change amount at the second change point (k ₂ ) through Equation 11 below.

In operation 705 , the processor 330 may determine whether the first accumulated signal energy value s[k ₁ ] at the first change point k ₁ is a positive number.

~

)에 있는지 여부를 판단할 수 있다.When the first accumulated signal energy value (s[k ₁ ]) at the first change point (k ₁ ) is a positive number (operation 705-yes), the processor 330 calculates the ratio ( ratio ₁ ) is within the first range. As an example, the processor 330, as shown in Equation 12 below, the calculated ratio (ratio ₁ ) is within the first range (eg:

~

) can be determined.

는 임계값으로 0에서 1 사이의 값을 나타낼 수 있다.In Equation 12 above,

is a threshold value and may represent a value between 0 and 1.

According to various embodiments, as the threshold value is smaller, the energy change between the first change point (k ₁ ) and the subsequent symbol position (k ₁ +1) and the second change point (k ₂ ) and the subsequent symbol position (k ₂ + 1) The probability of determining that the change in energy between the mini-slot interference signals is reduced may be reduced. As the threshold value increases, the energy change between the first change point (k ₁ ) and the subsequent symbol position (k ₁ +1) and the energy change between the second change point (k ₂ ) and the subsequent symbol position (k ₂ +1) The probability of determining that the mini-slot is influenced by the interference signal may increase.

내지

각각을 1로 결정할 수 있다. 프로세서(330)는 제1 슬롯 내의 1번째 OFDM 심볼부터 k₁번째 OFDM 심볼에 미니-슬롯 간섭 신호가 있는 것으로 결정할 수 있다. 동작 709에서, 프로세서(330)는 제1 슬롯 내의 k₁+1번째 OFDM 심볼부터 제1 슬롯 내의 마지막 OFDM 심볼까지 미니-슬롯 간섭 신호가 없는 것으로 결정할 수 있다. Processor 330, if the calculated ratio (ratio ₁ ) is not within the first range (operation 707-no), in operation 709

pay

Each can be set to 1. The processor 330 may determine that the mini-slot interference signal exists in the k 1 th OFDM symbol from the _1st OFDM symbol in the 1st slot. At operation 709, the processor 330 may determine that there is no mini-slot interfering signal from the k ₁ +1 th OFDM symbol in the first slot to the last OFDM symbol in the first slot.

When the calculated ratio (ratio ₁ ) is within the first range (operation 707-yes), the processor 330 determines whether the second change point (k ₂ ) is between 1 and K in operation 711. can be checked. In other words, the processor 330 may determine whether the second change point k ₂ belongs to symbol positions of OFDM symbols in the first slot.

The processor 330 may perform operation 709 when the second change point k ₂ is not between 1 and K (operation 711-No). In other words, the processor 330 may perform operation 709 in which the second change point k ₂ does not belong to symbol positions of OFDM symbols in the first slot.

내지

각각을 1로 결정할 수 있다. 프로세서(330)는 k₂+1번째 OFDM 심볼부터 k₁번째 OFDM 심볼에 미니 슬롯 간섭 신호가 있는 것으로 결정할 수 있다. 달리 표현하면, 프로세서(330)는 k₂번째 OFDM과 k₂+1번째 OFDM 심볼 사이에 미니-슬롯 간섭 신호가 유입되기 시작하는 것으로 판단할 수 있고, k₁번째 OFDM 심볼에서 미니-슬롯 간섭 신호가 끝나는 것으로 판단할 수 있다. 동작 713에서, 프로세서(330)는 나머지 OFDM 심볼에 미니-슬롯 간섭 신호가 없는 것으로 판단할 수 있다.Processor 330, if the second change point (k ₂ ) is between 1 and K (operation 711-yes), in operation 713,

pay

Each can be set to 1. The processor 330 may determine that minislot interference signals exist in k ₂ +1 th OFDM symbols to k ₁ th OFDM symbols. In other words, the processor 330 may determine that the mini-slot interference signal starts flowing between the k ₂ th OFDM symbol and the k ₂ +1 th OFDM symbol, and the mini-slot interference signal in the k ₁ th OFDM symbol. can be judged to be over. In operation 713, the processor 330 may determine that there is no mini-slot interference signal in the remaining OFDM symbols.

In operation 705, the processor 330 may determine that the first accumulated signal energy value s[k ₁ ] at the first change point k ₁ is a negative number (operation 705 - No). In this case, in operation 715, the processor 330 may determine whether the calculated ratio (ratio ₁ ) is within a first range.

내지

각각을 1로 결정할 수 있다. 프로세서(330)는 제1 슬롯 내의 k₁+1번째 OFDM 심볼부터 K번째 OFDM 심볼에 미니 슬롯 간섭 신호가 있는 것으로 결정할 수 있다. 달리 표현하면, 프로세서(330)는 k₁번째 OFDM과 k₁+1번째 OFDM 심볼 사이에 미니-슬롯 간섭 신호가 유입되기 시작하는 것으로 판단할 수 있고, K번째 OFDM 심볼까지 미니-슬롯 간섭 신호가 존재하는 것으로 판단할 수 있다. 동작 717에서, 프로세서(330)는 나머지 OFDM 심볼에 미니-슬롯 간섭 신호가 없는 것으로 판단할 수 있다.Processor 330, if the calculated ratio (ratio ₁ ) is not within the first range (operation 715-no), in operation 717,

pay

Each can be set to 1. The processor 330 may determine that mini-slot interference signals exist in k ₁ +1 th OFDM symbols to K th OFDM symbols in the first slot. In other words, the processor 330 may determine that the mini-slot interference signal starts flowing between the k ₁ th OFDM and the k ₁ +1 th OFDM symbol, and the mini-slot interference signal continues until the K th OFDM symbol. can be judged to exist. In operation 717, the processor 330 may determine that there is no mini-slot interference signal in the remaining OFDM symbols.

If the calculated ratio (ratio ₁ ) is within the first range (operation 715-yes), the processor 330 determines whether the second change point (k ₂ ) is between 1 and K in operation 719. can be checked. In other words, the processor 330 may determine whether the second change point k ₂ belongs to symbol positions of OFDM symbols in the first slot.

The processor 330 may perform operation 717 when the second change point k ₂ is not between 1 and K (operation 719-No). In other words, the processor 330 may perform operation 717 when the second change point k ₂ does not belong to symbol positions of OFDM symbols in the first slot.

내지

각각을 1로 결정할 수 있다. 프로세서(330)는 k₁+1번째 OFDM 심볼부터 k₂번째 OFDM 심볼에 미니 슬롯 간섭 신호가 있는 것으로 결정할 수 있다. 달리 표현하면, 프로세서(330)는 k₁번째 OFDM 심볼과 k₁+1번째 OFDM 심볼 사이에 미니-슬롯 간섭 신호가 유입되기 시작하는 것으로 판단할 수 있고, k₂번째 OFDM 심볼에서 미니-슬롯 간섭 신호가 끝나는 것으로 판단할 수 있다. 동작 721에서, 프로세서(330)는 나머지 OFDM 심볼에 미니-슬롯 간섭 신호가 없는 것으로 판단할 수 있다.When the second change point (k ₂ ) is between 1 and K (operation 711-yes), the processor 330, in operation 721,

pay

Each can be set to 1. The processor 330 may determine that minislot interference signals exist in k ₁ +1 th OFDM symbols to k ₂ th OFDM symbols. In other words, the processor 330 may determine that the mini-slot interference signal starts to flow between the k ₁ th OFDM symbol and the k ₁ +1 th OFDM symbol, and the mini-slot interference signal in the k ₂ th OFDM symbol. It can be determined that the signal ends. In operation 721, the processor 330 may determine that there is no mini-slot interference signal in the remaining OFDM symbols.

Although not shown in FIG. 7 , the processor 330 may detect an OFDM symbol estimated to have a mini-slot interference signal among OFDM symbols in slots subsequent to the first slot.

10 shows an example of a mini-slot interference pattern within the first slot. In the example shown in FIG. 10 , the first change point k ₁ is 9 and the second change point k ₂ is 2. In the example shown in FIG. 10, the processor 330 may determine that the mini-slot interference signal starts to flow between the 2nd and 3rd OFDM symbols, and the mini-slot interference signal in the 9th OFDM symbol. can be judged to be over.

FIG. 11 is a diagram for describing performance of a receiving apparatus for detecting a mini-slot interference pattern, according to various embodiments.

A probability that the receiver 300 determines that a mini-slot interference signal exists in an OFDM symbol in which a mini-slot interference signal actually exists may be referred to as a detection probability. Equation 13 below may represent the detection probability.

Although the mini-slot interference signal does not actually exist in the OFDM symbol, the probability that the receiver 300 determines that the mini-slot interference signal exists in the corresponding OFDM symbol may be referred to as a false-alarm probability. Equation 14 below may represent a false positive probability.

)에 상관없이 전체적으로 좌측 상단에 위치할 수 있어, 좋은 검출 성능을 보여줄 수 있다.In FIG. 11, a receiver operating characteristic may be an index representing detection performance. The higher the detection probability and the false positive probability are located in the upper left corner, the better the detection performance, and the closer they are to the dotted line marked with the randomized rule, the poorer the detection performance. The detection probability and the false positive probability of the receiving device 300 according to various embodiments are determined by a threshold value (eg, in Equation 12 above).

), it can be located in the upper left corner as a whole, and thus it can show good detection performance.

According to various embodiments, the receiving device 110 or 300 converts an RF signal received through the plurality of antennas 310-1 to 310-n and the antennas 310-1 to 310-n into a first signal. An RF transceiver 320 that converts, and a first energy vector (eg, the energy vector 520 of FIG. 5) for a signal in a first slot among the first signals is acquired, but in each of a plurality of OFDM symbols in the first slot. A first energy vector may be obtained by calculating a signal energy value of , a first cumulative sum vector for the obtained first energy vector may be determined, and a first change point may be determined based on the determined first cumulative sum vector. A second energy vector may be obtained by performing a cyclic shift on the first energy vector, a second cumulative sum vector for the obtained second energy vector may be determined, and based on the determined second cumulative sum vector A processor 330 capable of determining a second change point and detecting an OFDM symbol determined to have a mini-slot interference signal among OFDM symbols in the first slot based on the determined first and second change points can include

According to various embodiments, the determined first change point may belong to symbol positions of OFDM symbols, and the determined second change point may belong to symbol positions or may not belong to symbol positions.

According to various embodiments, the processor 330 may determine whether the first accumulated signal energy value at the determined first change point is a positive number, and the signal in an OFDM symbol after the determined first change point A first absolute value of a difference between the energy value and the signal energy value at the determined first change point may be calculated, and the signal energy value in the OFDM symbol after the determined second change point and the determined second change point. A second absolute value of the difference between the signal energies may be calculated, and a ratio between the calculated first absolute value and the calculated second absolute value (eg, the ratio (ratio ₁ ) of Equation 10 above) may be determined. there is.

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number (eg, operation 707 of FIG. 7 ). ), if the determined ratio does not belong to the first range, it may be determined that there is a mini-slot interference signal from the first OFDM symbol of the first slot to the determined OFDM symbol of the first change point (eg, operation 709 of FIG. 7 ). ).

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number (eg, operation 707 of FIG. 7 ). ), when the determined ratio belongs to the first range and the determined second change point does not belong to symbol positions (eg, operation 711 of FIG. 7 - No), the first change point determined from the first OFDM symbol of the first slot It may be determined that there is a mini-slot interference signal up to OFDM symbols of (eg, operation 709 of FIG. 7).

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number (eg, operation 707 of FIG. 7 ). ), when the determined ratio belongs to the first range and the determined second change point belongs to symbol positions (eg, operation 711 of FIG. 7 - YES), the first change point determined from the OFDM symbol after the determined second change point It may be determined that there is a mini-slot interference signal up to OFDM symbols of (eg, operation 713 of FIG. 7).

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number (eg, the operation of FIG. 7 715), if the determined ratio does not belong to the first range, it may be determined that there is a mini-slot interference signal from an OFDM symbol after the determined first change point to the last OFDM symbol of the first slot (eg, FIG. 7 ). operation of 717).

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number (eg, the operation of FIG. 7 715), if the determined ratio belongs to the first range and the determined second change point does not belong to the symbol positions (eg, operation 719 of FIG. 7 - No), the first slot from the OFDM symbol after the determined first change point It may be determined that there is a mini-slot interference signal up to the last OFDM symbol of (eg, operation 717 of FIG. 7).

According to various embodiments, the processor 330 may determine whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number, and the determined ratio is the first range and the determined second change point belongs to symbol positions (eg, operation 719 of FIG. 7 - Yes), from the OFDM symbol after the determined first change point to the OFDM symbol of the determined second change point. It may be determined that there is a slot interference signal (eg, operation 721 of FIG. 7 ).

According to various embodiments, the processor 330 may determine a cyclic shift value based on a difference value between the total number of OFDM symbols in the first slot and the determined first change point, and based on the determined cyclic shift value, the cyclic shift value can be performed.

According to various embodiments, the processor 330 may calculate a first accumulated signal energy value in each of the OFDM symbols by performing a cumulative sum (CUSUM) on the calculated signal energy values, and each calculated first accumulated signal energy A first cumulative sum vector including energy values may be determined, and an OFDM symbol position having a maximum value among absolute values of each of the calculated first accumulated signal energy values may be determined as a first change point.

According to various embodiments, the processor 330 may calculate a second accumulated signal energy value at each symbol position by performing a cumulative sum on the signal energy values in the obtained second energy vector, and the calculated second accumulated signal energy value A position of an OFDM symbol having a maximum value among absolute values of each of the signal energies may be identified, and when the first accumulated signal energy value at the first change point is a positive number, the first change point from the total number of OFDM symbols in the first slot A first value obtained by subtracting , a second change point may be determined by subtracting the first value calculated from the confirmed OFDM symbol position, and the first accumulated signal energy value at the first change point is a negative number. The second change point may be determined by adding the first change point to the confirmed OFDM symbol position.

According to various embodiments, a method of operating the receiving device 110 or 300 includes an operation of converting an RF signal received through the plurality of antennas 310-1 to 310-n into a first signal, and a first signal of the first signal. An operation of obtaining a first energy vector for a signal in one slot and calculating a signal energy value in each of a plurality of OFDM symbols in the first slot to obtain the first energy vector; An operation of determining a cumulative sum vector, an operation of determining a first change point based on the determined first cumulative sum vector, an operation of obtaining a second energy vector by performing a cyclic shift on the first energy vector, and an operation of obtaining the second energy An operation of determining a second cumulative sum vector for the vector, an operation of determining a second change point based on the determined second cumulative sum vector, and a mini-slot among OFDM symbols based on the determined first and second change points. An operation of detecting an OFDM symbol determined to have an interference signal may be included.

According to various embodiments, the determined first change point may belong to symbol positions of OFDM symbols, and the determined second change point may belong to symbol positions or may not belong to symbol positions.

According to various embodiments, an operating method of the receiving device 110 or 300 includes an operation of determining whether a first accumulated signal energy value at a determined first change point is a positive number, and after the determined first change point An operation of calculating a first absolute value of a difference between the signal energy value in the OFDM symbol and the signal energy value at the determined first change point, the signal energy value in the OFDM symbol after the determined second change point and the determined second absolute value. The method may further include calculating a second absolute value of the difference between the signal energies at the change point, and determining a ratio between the calculated first absolute value and the calculated second absolute value.

According to various embodiments, the detecting may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number, and determining whether the determined ratio does not fall within the first range. If not, an operation of determining that there is a mini-slot interference signal from the first OFDM symbol of the first slot to the determined OFDM symbol of the first change point may be included.

According to various embodiments, the detecting operation may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number, and determining whether the determined ratio falls within the first range. and if the determined second change point does not belong to the symbol positions, determining that there is a mini-slot interference signal from the first OFDM symbol of the first slot to the determined OFDM symbol of the first change point.

According to various embodiments, the detecting operation may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number, and determining whether the determined ratio falls within the first range. and if the determined second change point belongs to the symbol positions, determining that there is a mini-slot interference signal from an OFDM symbol after the determined second change point to an OFDM symbol of the determined first change point.

According to various embodiments, the detecting operation may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number, and determining whether the determined ratio falls within the first range. If not included, an operation of determining that there is a mini-slot interference signal from an OFDM symbol after the determined first change point to the last OFDM symbol of the first slot may be included.

According to various embodiments, the detecting operation may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number, and determining whether the determined ratio falls within the first range. and if the determined second change point does not belong to the symbol positions, determining that there is a mini-slot interference signal from an OFDM symbol after the determined first change point to the last OFDM symbol of the first slot. .

According to various embodiments, the detecting operation may include determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number, and determining whether the determined ratio falls within the first range. and if the determined second change point belongs to symbol positions, determining that there is a mini-slot interference signal from OFDM symbols after the determined first change point to OFDM symbols of the determined second change point. there is.

According to various embodiments, the obtaining of the second energy vector may include determining a cyclic shift value based on a difference between the total number of OFDM symbols and the determined first change point, and based on the determined cyclic shift value It may include an operation of performing a cyclic shift.

300: receiving device
310-1 to 310-n: a plurality of antennas
320: RF transceiver
330: processor
340: memory

Claims (20)

In the receiving device,
a plurality of antennas;
an RF transceiver converting an RF signal received through the antennas into a first signal; and
A first energy vector for a signal in a first slot among the first signals is obtained, and a signal energy value is calculated for each of a plurality of orthogonal frequency-division multiplexing (OFDM) symbols in the first slot. Obtaining, determining a first accumulative sum vector for the obtained first energy vector, determining a first change point based on the determined first accumulative sum vector, and performing a cyclic shift on the first energy vector. to obtain a second energy vector, determine a second cumulative sum vector for the obtained second energy vector, determine a second change point based on the determined second cumulative sum vector, and A processor for detecting an OFDM symbol determined to have a mini-slot interference signal among the OFDM symbols based on a second change point
including,
receiving device.
According to claim 1,
the determined first change point belongs to symbol positions of the OFDM symbols, and the determined second change point either belongs to the symbol positions or does not belong to the symbol positions;
the processor,
It is determined whether the first accumulated signal energy value at the determined first change point is a positive number, and the signal energy value in an OFDM symbol after the determined first change point and the first accumulated signal energy value at the determined first change point. A first absolute value of a difference between signal energies is calculated, and a second absolute value of a difference between the signal energy in an OFDM symbol after the determined second change point and the signal energy at the determined second change point is calculated. Calculating an absolute value and determining a ratio between the calculated first absolute value and the calculated second absolute value,
receiving device.
According to claim 2,
the processor,
When the first accumulated signal energy value at the determined first change point is a positive number, it is determined whether the determined ratio falls within a first range, and when the determined ratio does not fall within the first range, the first slot Determining that the mini-slot interference signal exists from a first OFDM symbol to an OFDM symbol of the determined first change point,
receiving device.
According to claim 2,
the processor,
When the first accumulated signal energy value at the determined first change point is a positive number, it is determined whether the determined ratio belongs to a first range, and if the determined ratio belongs to the first range and the determined second change point is If it does not belong to the symbol positions, determining that the mini-slot interference signal exists from the first OFDM symbol of the first slot to the OFDM symbol of the determined first change point,
receiving device.
According to claim 2,
the processor,
When the first accumulated signal energy value at the determined first change point is a positive number, it is determined whether the determined ratio belongs to a first range, and if the determined ratio belongs to the first range and the determined second change point is If it belongs to the symbol positions, determining that the mini-slot interference signal exists from an OFDM symbol after the determined second change point to an OFDM symbol of the determined first change point,
receiving device.
According to claim 2,
the processor,
When the determined first accumulated signal energy value at the first change point is a negative number, it is determined whether the determined ratio falls within a first range, and when the determined ratio does not fall within the first range, the determined first accumulated signal energy value is negative. Determining that the mini-slot interference signal exists from an OFDM symbol after the change point to the last OFDM symbol of the first slot,
receiving device.
According to claim 2,
the processor,
When the first accumulated signal energy value at the determined first change point is a negative number, it is determined whether the determined ratio belongs to a first range, and if the determined ratio belongs to the first range and the determined second change point If does not belong to the symbol positions, determining that the mini-slot interference signal exists from the OFDM symbol after the determined first change point to the last OFDM symbol of the first slot,
receiving device.
According to claim 2,
the processor,
When the first accumulated signal energy value at the determined first change point is a negative number, it is determined whether the determined ratio belongs to a first range, and if the determined ratio belongs to the first range and the determined second change point determining that there is the mini-slot interference signal from an OFDM symbol after the determined first change point to an OFDM symbol of the determined second change point, when belongs to the symbol positions;
receiving device.
According to claim 1,
the processor,
determining a cyclic shift value based on a difference between the total number of OFDM symbols and the determined first change point, and performing the cyclic shift based on the determined cyclic shift value;
receiving device.
According to claim 1,
the processor,
A cumulative sum (CUSUM) is performed on the calculated signal energies to calculate a first accumulated signal energy value in each of the OFDM symbols, and the first accumulated signal energy value including each calculated first accumulated signal energy value Determining a sum vector, and determining an OFDM symbol position having a maximum value among absolute values of each of the calculated first accumulated signal energy values as the first change point,
receiving device.
According to claim 1,
the processor,
A cumulative sum is performed on the signal energies in the obtained second energy vector to calculate a second accumulated signal energy value at each symbol position, and the maximum of the absolute values of each of the calculated second accumulated signal energies is calculated. An OFDM symbol position having a value is identified, and when a first accumulated signal energy value at the first change point is a positive number, a first value obtained by subtracting the first change point from the total number of OFDM symbols is calculated, and the check is performed. The second change point is determined by subtracting the calculated first value from the determined OFDM symbol position, and when the first accumulated signal energy value at the first change point is a negative number, the first change point is determined at the determined OFDM symbol position. Determining the second change point by adding one change point,
receiving device.
In the operation method of the receiving device,
converting an RF signal received through a plurality of antennas into a first signal;
acquiring a first energy vector for a signal of a first slot among the first signals, and calculating a signal energy value in each of a plurality of OFDM symbols in the first slot to obtain the first energy vector;
determining a first cumulative sum vector for the obtained first energy vector;
determining a first change point based on the determined first cumulative sum vector;
obtaining a second energy vector by performing a cyclic shift on the first energy vector;
determining a second cumulative sum vector for the obtained second energy vector;
determining a second change point based on the determined second cumulative sum vector; and
Detecting an OFDM symbol determined to have a mini-slot interference signal among the OFDM symbols based on the determined first and second change points
including,
How the receiving device operates.
According to claim 12,
the determined first change point belongs to symbol positions of the OFDM symbols, and the determined second change point either belongs to the symbol positions or does not belong to the symbol positions;
determining whether the first accumulated signal energy value at the determined first change point is a positive number;
calculating a first absolute value of a difference between a signal energy value in an OFDM symbol after the determined first change point and a signal energy value at the determined first change point;
calculating a second absolute value of a difference between a signal energy value in an OFDM symbol after the determined second change point and a signal energy value at the determined second change point; and
An operation of determining a ratio between the calculated first absolute value and the calculated second absolute value
Including more,
How the receiving device operates.
According to claim 13,
The detecting operation is
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number; and
When the determined ratio does not belong to the first range, determining that the mini-slot interference signal exists from the first OFDM symbol of the first slot to the OFDM symbol of the determined first change point.
including,
How the receiving device operates.
According to claim 13,
The detecting operation,
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number; and
If the determined ratio falls within the first range and the determined second change point does not fall within the symbol positions, the mini-slot from the first OFDM symbol of the first slot to the OFDM symbol of the determined first change point Operation to determine that there is an interfering signal
including,
How the receiving device operates.
According to claim 13,
The detecting operation is
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a positive number; and
If the determined ratio belongs to the first range and the determined second change point belongs to the symbol positions, from the OFDM symbol after the determined second change point to the OFDM symbol of the determined first change point, the mini- Operation to determine that there is a slot interference signal
including,
How the receiving device operates.
According to claim 13,
The detecting operation,
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number; and
When the determined ratio does not belong to the first range, determining that the mini-slot interference signal exists from an OFDM symbol after the determined first change point to a last OFDM symbol of the first slot.
including,
How the receiving device operates.
According to claim 13,
The detecting operation is
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number; and
If the determined ratio belongs to the first range and the determined second change point does not belong to the symbol positions, from the OFDM symbol following the determined first change point to the last OFDM symbol of the first slot, the mini- Operation to determine that there is a slot interference signal
including,
How the receiving device operates.
According to claim 13,
The detecting operation is
determining whether the determined ratio falls within a first range when the first accumulated signal energy value at the determined first change point is a negative number; and
If the determined ratio belongs to the first range and the determined second change point belongs to the symbol positions, from the OFDM symbol after the determined first change point to the OFDM symbol of the determined second change point, the mini- Operation to determine that there is a slot interference signal
including,
How the receiving device operates.
According to claim 12,
The operation of obtaining the second energy vector,
determining a cyclic shift value based on a difference between the total number of OFDM symbols and the determined first change point; and
Performing the cyclic shift based on the determined cyclic shift value
including,
How the receiving device operates.

Images