KR20230105782A - Transmitting apparatus and operating method thereof - Google Patents

Abstract

A transmitting device according to various embodiments may include an antenna module, a first communication module for transmitting and receiving signals to and from a first terminal served by the transmitting device through the antenna module, and a processor electrically connected to the first communication module. can The processor obtains a channel matrix between terminals that have performed Rx beamforming and the transmitter, and from the obtained channel matrix, a channel matrix between terminals other than the first terminal among the terminals and the transmitter. Obtaining a first interference channel matrix corresponding to , obtaining a second interference channel matrix that satisfies an interference strength condition from the obtained first interference channel matrix, and combining the given precoding matrix and the obtained second interference channel matrix Based on this, it is possible to determine a precoding matrix for the transmission stream of the first terminal.

Description

Transmission device and its operating method {TRANSMITTING APPARATUS AND OPERATING METHOD THEREOF}

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

Implementation of the 5G communication system in a mmWave band (eg, a 60 gigabyte (60 GHz) band) is being considered. In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

There is a beamforming technique for interference control in a downlink multi-cell multi-user environment of a 5G communication system. As an example, there is an interference nulling technique using zero forcing (ZF) or minimum mean square error (MMSE) and a technique for obtaining maximum signal to leakage plus noise ratio (SLNR) performance.

In the case of the existing interference nulling scheme, when interference control is performed, the size (or power) of a desired signal may be reduced. In the case of a scheme for obtaining maximum SLNR performance, the leakage power is not limited, and the magnitude (or power) of the interference signal to other users increases as the magnitude (or power) of the desired signal increases. there is.

Various embodiments may provide a transmission device capable of canceling or mitigating inter-sector/cell interference.

Various embodiments may provide a transmission device capable of obtaining the maximum amplitude (or maximum power) of a desired signal in an environment where leakage power is limited.

Various embodiments may provide a transmitting device capable of lowering an interference signal of another user when there is another user having a high channel correlation with the serving user.

Various embodiments may provide a transmitting device that performs beamforming in consideration of the size of an interference channel affecting other users while transmitting a signal to a serving user.

Various embodiments may provide a transmitting device that performs beamforming while transmitting a signal to a serving user while considering the size of an interference channel and channel correlation affecting other users.

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 transmitting device according to various embodiments may include an antenna module, a first communication module for transmitting and receiving signals to and from a first terminal served by the transmitting device through the antenna module, and a processor electrically connected to the first communication module. can The processor obtains a channel matrix between terminals that have performed Rx beamforming and the transmitter, and from the obtained channel matrix, a channel matrix between terminals other than the first terminal among the terminals and the transmitter. Obtaining a first interference channel matrix corresponding to , obtaining a second interference channel matrix that satisfies an interference strength condition from the obtained first interference channel matrix, and combining the given precoding matrix and the obtained second interference channel matrix Based on this, it is possible to determine a precoding matrix for the transmission stream of the first terminal.

A method of operating a transmitting device according to various embodiments includes an operation of obtaining a channel matrix between terminals that have performed reception beamforming and the transmitting device, and a first serving of the transmitting device among the terminals from the obtained channel matrix. Obtaining a first interference channel matrix corresponding to a channel matrix between other terminals other than the terminal and the transmitting device, and obtaining a second interference channel matrix satisfying an interference strength condition from the obtained first interference matrix. , and determining a precoding matrix for the transmission stream of the first terminal based on the given precoding matrix and the obtained second interference channel matrix.

A transmitting device according to various embodiments may minimize interference strength of a transmission stream of a serving terminal and determine an optimal precoding matrix for the transmission stream.

A transmission device according to various embodiments may perform a transmission operation by maximizing power of a desired signal in an environment where leakage power is limited.

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 to 8 are flowcharts for explaining operations of a transmission device according to various embodiments.
9 to 11 are diagrams for explaining an example in which a transmitting device determines a precoding matrix for a transmission stream of a serving terminal, according to various embodiments.
12 to 15 are diagrams for explaining another example in which a transmitting device determines a precoding matrix for a transmission stream of a serving terminal, according to various embodiments.
16 is a block diagram for explaining a transmission device 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 is a diagram for explaining an example of a wireless communication system (eg, a 5G communication system) according to various embodiments.

Referring to FIG. 1 , terminals 120 and 130 may be located in a cell of a transmitter 110 (eg, a base station). The terminal 140 may be located in the neighboring cell 1 of the transmitter 110, and the terminal 150 may be located in the neighboring cell 2.

In the example shown in FIG. 1 , the terminal 120 within the cell of the transmitter 110 may be a terminal served by the transmitter 110 .

When the transmission device 110 transmits a transmission stream to the terminal 120, the transmission stream may act as interference to the terminals 130, 140, and 150 of FIG. Since the terminal 120 and the terminal 130 are located in the same cell (ie, the cell of the transmitting device 110), the interference of the transmission stream of the terminal 120 to the terminal 130 is inter-user interference (IUI: inter-user interference). Since the terminal 140 and the terminal 150 are located in different cells from the terminal 120, the interference of the transmission stream of the terminal 120 to the terminal 140 and the terminal 150, respectively, is inter-cell interference (ICI: inter-cell interference).

In the example shown in FIG. 1 , a channel between the transmitter 110 and the terminal 120 may be referred to as a “desired channel”. A channel between the transmitter 110 and the terminals 130, 140, and 150 may be referred to as an “interference channel”. More specifically, the channel between the transmitter 110 and the terminal 130 may be referred to as an IUI interference channel, and the channel between the transmitter 110 and the terminals 140 and 150, respectively, is referred to as an ICI interference channel. It can be.

According to various embodiments, the transmitter 110 may perform precoding (or beamforming) on the terminal 120 served by the transmitter 110 in consideration of the interference channel intensity. This will be described later with reference to FIGS. 9 to 11 .

According to various embodiments, the transmitter 110 performs precoding (or beamforming) on the terminal 120 served by the transmitter 110 in consideration of the interference channel size and channel correlation. can This will be described later with reference to FIGS. 12 to 15 .

According to various embodiments, the transmitter 110 may maximize power of a desired signal in an environment where leakage power is limited. Leakage power refers to the signal (or transmission stream) transmitted by the transmitter 110 reaching a receiving end (eg, terminals 130, 140, and 150) other than the target receiving end (eg, terminal 120). can represent the sum of their powers.

According to various embodiments, the terminal 130 may have a high channel correlation with the terminal 120 . A transmission stream to be transmitted by the transmitter 110 to the terminal 120 may be an interference signal in the terminal 130, and the power of the interference signal in the terminal 130 may be high. The transmitter 110 may determine a precoding matrix for the transmission stream of the terminal 120 so that the power of the interference signal of the terminal 130 is lowered. Detailed operations of the transmitter 110 will be described below.

2 is a flowchart illustrating an operation of a transmission device according to various embodiments.

Referring to FIG. 2 , in operation 210 , the transmitter 110 may obtain a channel matrix between the terminals and the transmitter 110 having performed reception beamforming (or combining).

(420)를 획득할 수 있다. 수신 빔포밍 행렬(410)은 L×N 행렬일 수 있고, L은 단말(120)이 지원받는 스트림의 개수를 나타낼 수 있다. 채널 행렬

(420)은 L×M 행렬일 수 있다.In the example shown in FIG. 3 , the transmitter 110 may include M antennas, and the terminal 120 may include N antennas. A channel matrix H 310 between the transmitter 110 and the terminal 120 may be an N×M matrix. When the terminal 120 performs reception beamforming, as in the example shown in FIG. 4 , the transmitter 110 performs matrix multiplication between the reception beamforming matrix 410 of the terminal 120 and the channel matrix 310. Channel matrix corresponding to the result

(420) can be obtained. The reception beamforming matrix 410 may be an L×N matrix, and L may represent the number of streams supported by the terminal 120. channel matrix

(420) may be an L×M matrix.

In the example shown in FIG. 5, when the transmitter 110 tries to transmit a transport stream (hereinafter referred to as "i-th transport stream") to the terminal 120, as described with reference to FIG. 1, the i-th transmission The stream may be an interference signal to other terminals (UE1 to UE4 and UE6 to UE12).

In the example shown in FIG. 5 , each of the other terminals (UE1 to UE4 and UE6 to UE12) may perform reception beamforming. A channel between each of the UEs (UE1 to UE4 and UE6 to UE12) and the transmitter 110 performing reception beamforming may be an interference channel, and the UEs (UE1 to UE4 and UE6 to UE12) performing reception beamforming may be an interference channel. ) and the channel matrix between the transmitter 110 may correspond to an interference channel matrix.

(610)을 획득할 수 있다. 도 6의 채널 행렬

(610)에서,

는 수신 빔포밍을 수행한 단말(UE1)과 송신 장치(110) 사이의 채널 행렬을 나타낼 수 있고,

는 수신 빔포밍을 수행한 단말(UE2)와 송신 장치(110) 사이의 채널 행렬을 나타낼 수 있다. 마찬가지로, 도 6의 채널 행렬

(610)에서,

는 수신 빔포밍을 수행한 단말(UE12)와 송신 장치(110)의 사이의 채널 행렬을 나타낼 수 있다. 또한, 도 6에서, L_k는 k번째 단말이 지원받는 스트림의 개수를 나타낼 수 있다.As shown in the example shown in FIG. 6 , the transmitter 110 transmits a channel matrix between the terminals UE1 to UE12 and the transmitter 110 having performed reception beamforming.

(610) can be obtained. Channel Matrix in Fig. 6

At (610),

May represent a channel matrix between the terminal UE1 and the transmitting device 110 having performed reception beamforming,

may represent a channel matrix between the terminal UE2 and the transmission device 110 having performed reception beamforming. Similarly, the channel matrix of FIG. 6

At (610),

may represent a channel matrix between the terminal UE12 and the transmitting device 110 having performed reception beamforming. Also, in FIG. 6, L _k may indicate the number of streams supported by the k-th terminal.

Returning to FIG. 2 , in operation 220, the transmitter 110 transmits UEs UE1 to UE4 and UE6 to UE12 other than the target terminal 120 of the i-th transmission stream and the transmitter 110 from the obtained channel matrix 610. A first interference channel matrix corresponding to the channel matrix between (110) can be obtained.

(710)는 송신 장치(110)와 i번째 송신 스트림의 타겟 단말(120) 사이의 채널 행렬에 해당할 수 있고, 채널 행렬

(710)을 제외한 나머지는 간섭 채널 행렬에 해당할 수 있다. 송신 장치(110)는 채널 행렬(610)에서 채널 행렬

(710)을 제거하여 제1 간섭 채널 행렬

(720)을 획득할 수 있다.As an example, referring to the example shown in FIG. 7 , the channel matrix in the channel matrix 610

710 may correspond to a channel matrix between the transmitter 110 and the target terminal 120 of the i-th transmission stream, and the channel matrix

Except for 710, the rest may correspond to an interference channel matrix. The transmitter 110 transmits the channel matrix in the channel matrix 610

(710) is removed to obtain the first interfering channel matrix

(720) can be obtained.

"인 조건을 나타낼 수 있다. 여기서, ρ는 i번째 송신 스트림의 전송을 위해 설정된 송신 전력을 나타낼 수 있고,

는 설정된 간섭 세기로, i번째 송신 스트림이 단말들(UE1 내지 UE4와 UE6 내지 UE12)에 미치는 최대 간섭 세기를 의미할 수 있다. 일례로, 도 8에 도시된 예에서, 송신 장치(110)는 획득된 제1 간섭 채널 행렬(720) 내의 행(row) 벡터들(810-1 내지 810-m) 각각의 L2 norm 을 계산할 수 있다. 송신 장치(110)는 row 벡터들(810-1 내지 810-m) 각각의 L2 norm과 설정된 송신 전력(ρ) 사이의 곱셈을 수행할 수 있고, 각 곱셈 결과 중

보다 큰 row 벡터를 포함하는 제2 간섭 채널 행렬

(820)을 획득할 수 있다. 도 8에서, row 벡터(810-1)의 L2 norm과 설정된 송신 전력(ρ) 사이의 곱셈 결과가

보다 크면, row 벡터(810-1)는 제2 간섭 채널 행렬

(820)에 포함될 수 있다. row 벡터(810-x)의 L2 norm과 설정된 송신 전력(ρ) 사이의 곱셈 결과가

보다 작으면, row 벡터(810-x)는 제2 간섭 채널 행렬

(820)에 포함되지 않을 수 있다. 달리 표현하면, 송신 장치(110)는 획득된 제1 간섭 채널 행렬(720)에서 간섭 세기 조건을 만족하지 않은 row 벡터를 제거하여 제2 간섭 채널 행렬

(820)을 생성할 수 있다. Returning to FIG. 2 , in operation 230, the transmitter 110 may obtain a second interference channel matrix that satisfies the interference strength condition from the obtained first interference channel matrix 720. The interference intensity condition is “vector magnitude (e.g. L2 norm) × ρ >

". Here, ρ may represent the transmission power set for transmission of the i-th transmission stream,

Is the set interference strength, and may mean the maximum interference strength that the i-th transmission stream has on the UEs UE1 to UE4 and UE6 to UE12. For example, in the example shown in FIG. 8 , the transmitter 110 may calculate L2 norm of each of the row vectors 810-1 to 810-m in the obtained first interference channel matrix 720. there is. The transmitter 110 may perform multiplication between the L2 norm of each of the row vectors 810-1 to 810-m and the set transmission power ρ, and among the multiplication results

A second interfering channel matrix containing a larger row vector

(820) can be obtained. In FIG. 8, the multiplication result between the L2 norm of the row vector 810-1 and the set transmission power ρ is

If greater than, the row vector 810-1 is the second interference channel matrix

(820). The multiplication result between the L2 norm of the row vector (810-x) and the set transmit power (ρ) is

If less than, the row vector (810-x) is the second interference channel matrix

(820) may not be included. In other words, the transmitter 110 removes row vectors that do not satisfy the interference intensity condition from the obtained first interference channel matrix 720 to obtain a second interference channel matrix.

(820) can be created.

)과 획득된 제2 간섭 채널 행렬

(820)을 기초로 i번째 송신 스트림(또는 단말(120))에 대한 프리코딩 행렬을 결정할 수 있다. 여기서,

는 i번째 송신 스트림에 대한 최대 비율 전송(MRT: maximum ratio transmit) 프리코딩 행렬을 나타낼 수 있다. 동작 240에 대한 일례를 도 9 내지 도 11을 통해 후술하고, 동작 240에 대한 다른 일례를 도 12 내지 도 14를 통해 후술한다.Returning to FIG. 2 , in operation 240, the transmitting device 110 performs a given precoding matrix (eg:

) and the obtained second interference channel matrix

Based on step 820, a precoding matrix for the i-th transmission stream (or terminal 120) may be determined. here,

May represent a maximum ratio transmit (MRT) precoding matrix for the i-th transmission stream. An example of the operation 240 will be described below with reference to FIGS. 9 to 11 , and another example of the operation 240 will be described later with reference to FIGS. 12 to 14 .

In operation 250, the transmitter 110 may perform a transmission operation based on the determined precoding matrix. For example, the transmitter 110 may perform digital precoding (or digital beamforming) through the determined precoding matrix, and perform analog precoding (or analog beamforming) based on a result of the digital precoding. The i-th transport stream may be transmitted to the terminal 120 .

9 to 11 are diagrams for explaining an example in which a transmitting device determines a precoding matrix for a transmission stream of a serving terminal, according to various embodiments.

(820)의 널 공간(null space)을 생성할 수 있고, 동작 920에서, null 공간에 주어진 프리코딩 행렬(예:

)을 프로젝션(projection)하여 제1 벡터

를 결정(또는 생성)할 수 있다. Referring to FIG. 9 , the transmitter 110, in operation 910, obtains a second interference channel matrix.

A null space of 820 may be generated, and in operation 920, a precoding matrix given in the null space (eg:

) by projecting the first vector

can be determined (or created).

(820)의 null 공간(1010)을 생성할 수 있다. null 공간(1010)을 수학식으로 표현하면 아래 수학식 1과 같다. As an example, in the example shown in FIG. 10, the transmitter 110 obtains the second interference channel matrix.

A null space (1010) of (820) can be created. The null space 1010 is expressed as Equation 1 below.

In Equation 1 above, I may represent an identity matrix.

일 때,

(1020)는 아래 수학식 2로 나타낼 수 있다. In the example shown in FIG. 10, the channel for the transmission device 110 to transmit the i-th transmission stream is

when,

(1020) can be represented by Equation 2 below.

는 L2 norm을 나타내고, conj는 컨쥬게이트(conjugate) 연산자를 나타내며, ρ는 위에서 설명한 것과 같이 i번째 송신 스트림의 전송을 위해 설정된 송신 전력을 나타낼 수 있다.In Equation 2 above,

denotes the L2 norm, conj denotes a conjugate operator, and ρ may denote transmit power set for transmission of the i-th transmit stream as described above.

(1020)을 null 공간(1010)에 프로젝션하여 제1 벡터

(1030)를 생성할 수 있다. 제1 벡터

(1030)는 아래 수학식 3으로 나타낼 수 있다.Transmitting device 110 is given

First vector by projecting (1020) into null space (1010)

(1030). first vector

(1030) can be represented by Equation 3 below.

(1030)는 desired 채널과 상관성(correlation)이 가장 높을 수 있다.In null space 1010, the first vector

1030 may have the highest correlation with the desired channel.

)에 제1 가중치를 적용할 수 있고, 제1 벡터

(1030)에 제2 가중치를 적용할 수 있다. 동작 940에서, 송신 장치(110)는 제1 가중치가 적용된 프리코딩 행렬과 제2 가중치가 적용된 제1 벡터를 이용하여 i번째 송신 스트림에 대한 프리코딩 행렬을 결정할 수 있다. 달리 표현하면, 송신 장치(110)는 주어진 프리코딩 행렬(예:

)과 제1 벡터

(1030)의 weighted sum을 i번째 송신 스트림에 대한 프리코딩 행렬로 결정할 수 있다. 일례로, 송신 장치(110)는 아래 수학식 4를 통해 i번째 송신 스트림에 대한 프리코딩 행렬을 결정할 수 있다.Returning to FIG. 9 , in operation 930, the transmitting device 110 performs a given precoding matrix (eg:

), a first weight may be applied to the first vector

A second weight may be applied to (1030). In operation 940, the transmitter 110 may determine a precoding matrix for the i-th transmission stream by using a precoding matrix to which a first weight is applied and a first vector to which a second weight is applied. In other words, the transmitter 110 is given a precoding matrix (eg:

) and the first vector

A weighted sum of 1030 may be determined as a precoding matrix for the i-th transmission stream. For example, the transmitter 110 may determine a precoding matrix for the i-th transmission stream through Equation 4 below.

는 i번째 송신 스트림에 대한 프리코딩 행렬을 나타낼 수 있고, α _i 는 제1 가중치를 나타낼 수 있으며, β _i 는 제2 가중치를 나타낼 수 있다. In Equation 4 above,

may represent a precoding matrix for the i-th transmission stream, α _i may represent a first weight, and β _i may represent a second weight.

(1110)의 일례가 도시된다. 도 11에서, α _i 가 증가할수록 desired 신호(예: i번째 송신 스트림)의 전력은 증가할 수 있고, α _i 가 일정 수준을 초과하게 되면, desired 신호가 단말들(UE1 내지 UE4와 UE6 내지 UE12) 중 어느 하나에 주는 간섭의 세기가 설정된 간섭 세기(

)를 초과할 수 있다. β _i 가 증가할수록 간섭 제어 효과가 클 수 있다.11, the precoding matrix for the i-th transmission stream

An example of 1110 is shown. In FIG. 11, as α _i increases, the power of the desired signal (eg, the ith transmission stream) may increase, and when α _i exceeds a certain level, the desired signal is transmitted to the terminals (UE1 to UE4 and UE6 to UE12). ), the interference strength in which the strength of interference given to any one is set (

) can be exceeded. As β _i increases The interference control effect may be large.

)를 초과하지 않고 최대 desired 신호 전력을 얻을 수 있도록 α _i 와 β _i 를 결정할 수 있다. 일례로, 송신 장치(110)는

이면, α _i =1로 결정할 수 있고, β _i =0으로 결정할 수 있다. 송신 장치(110)는

이면, 아래 수학식 5를 통해 α _i 와 β _i 를 결정할 수 있다.In an embodiment, the transmitting device 110 sets the interference intensity (

) can be _determined so that the maximum desired signal power can be obtained without _exceeding In one example, the transmitting device 110

, it can be determined as α _i =1 and β _i =0. The transmitting device 110 is

, α _i and β _i can be determined through Equation 5 below.

는 최대 norm을 나타낼 수 있고, Re는 주어진 복소수에서 실수를 출력 또는 반환하는 연산자를 나타낼 수 있다.In Equation 5 above,

can represent the maximum norm, and Re can represent an operator that outputs or returns a real number from a given complex number.

(820)과 주어진 프리코딩 행렬(예:

)(1020)의 행렬 곱셈의 최대 norm의 제곱을 계산할 수 있고, 설정된 간섭 세기(

)와 최대 norm의 제곱 사이의 비율(예:

)을 계산할 수 있다. 송신 장치(100)는 계산된 비율이 일정 범위(예: 0~1) 사이에 있는 경우 위 수학식 5를 통해 α _i 와 β _i 를 결정할 수 있다. 송신 장치(100)는 계산된 비율이 일정 범위에 있지 않은 경우(예: 계산된 비율이 1을 초과하는 경우), α _i =1로 결정할 수 있고, β _i =0으로 결정할 수 있다.The transmitter 110 is a second interference channel matrix

820 and the given precoding matrix (e.g.

) can calculate the square of the maximum norm of the matrix multiplication of 1020, and the set interference strength (

) and the square of the maximum norm (e.g.

) can be calculated. When the calculated ratio is within a certain range (eg, 0 to 1), the transmitter 100 may determine α _i and β _i through Equation 5 above. When the calculated ratio is not within a certain range (eg, when the calculated ratio exceeds 1), the transmitter 100 may determine α _i =1 and β _i =0.

(1110)을 결정한 경우, i번째 송신 스트림에 대한 프리코딩 행렬

(1110)을 기초로 송신 동작을 수행할 수 있다.The transmitter 110 is a precoding matrix for the i-th transmission stream.

If (1110) is determined, the precoding matrix for the i-th transmission stream

A transmission operation may be performed based on 1110.

12 to 14 are diagrams for explaining another example in which a transmitting device determines a precoding matrix for a transmission stream of a serving terminal, according to various embodiments.

가 영행렬(또는 empty 행렬)인지 여부를 판단할 수 있다.

는 i번째 송신 스트림에 대한 프리코딩 행렬의 생성에 이용된 간섭 채널에 해당하는 벡터를 모은 행렬을 나타낼 수 있다. Referring to FIG. 12 , in operation 1210, the transmitting device 110

It can be determined whether is a zero matrix (or an empty matrix).

May represent a matrix in which vectors corresponding to interference channels used to generate a precoding matrix for the i-th transmission stream are collected.

가 영행렬인 경우> <at action 1210

is a zero matrix>

가 영행렬인 경우(동작 1210-예), 동작 1211에서 주어진 프리코딩 행렬(예:

)을 벡터

(이하, 제2 벡터라 지칭함)로 설정(또는 결정)할 수 있다. The transmitting device 110 is

is a zero matrix (operation 1210-yes), the precoding matrix given in operation 1211 (eg:

) into the vector

(hereinafter referred to as a second vector) may be set (or determined).

(820)에서 제2 벡터와 상관도가 가장 높은 row 벡터(이하, 제1 row 벡터라 지칭함)를 선택할 수 있다. 선택된 제1 row 벡터는 제2 간섭 채널 행렬

(820)에서 세기가 가장 큰 간섭 채널에 해당할 수 있다. In operation 1212, the transmitting device 110 performs a second interfering channel matrix.

In step 820, a row vector having the highest correlation with the second vector (hereinafter, referred to as a first row vector) may be selected. The selected first row vector is the second interference channel matrix

In 820, it may correspond to an interference channel having the largest intensity.

(820)에서 제2 벡터와 상관도가 가장 높은 제1 row 벡터를 선택할 수 있다.For example, as in the example shown in FIG. 13, the transmitter 110 uses the second interference channel matrix through Equation 6 below.

In step 820, the first row vector having the highest correlation with the second vector may be selected.

는 선택된 제1 row 벡터를 나타낼 수 있다.In Equation 6 above,

May represent the selected first row vector.

Returning to FIG. 12 , in operation 1213, the transmitter 110 may determine a precoding matrix for the i-th transmission stream based on the second vector and the selected row vector. For example, the transmitter 110 may determine a precoding matrix for the i-th transmission stream through Equations 7 and 8 below.

가 영행렬인 경우, 도 12에서 도시된 예에서, i번째 송신 스트림에 대한 프리코딩 행렬(

)은 결정된 이력이 없으므로, 영행렬일 수 있다. 송신 장치(110)는 위 수학식 8을 통해 계산된 α와 β 중 최소값을 제2 벡터에 적용할 수 있고, 최소값이 적용된 제2 벡터를 i번째 송신 스트림에 대한 프리코딩 행렬을 결정할 수 있다.

When is a zero matrix, in the example shown in FIG. 12, the precoding matrix for the i-th transmission stream (

) may be a zero matrix since there is no determined history. The transmitter 110 may apply the minimum value of α and β calculated through Equation 8 above to the second vector, and may determine a precoding matrix for the i-th transmission stream using the second vector to which the minimum value is applied.

In operation 1214, the transmitter 110 may determine whether the square of the norm of the determined precoding matrix is greater than or equal to a set transmit power. In other words, the transmitter 110 may determine whether the determined precoding matrix satisfies the transmission power condition. The transmitting device 110 may perform a transmitting operation in operation 250 when the square of the norm of the determined precoding matrix is greater than or equal to the set transmission power (operation 1214-yes).

(820)과

를 업데이트할 수 있다. 일례로, 도 14에 도시된 예에서, 송신 장치(110)는 제1 row 벡터(1410)를 제2 간섭 채널 행렬 (820)에서 제거하여 제2 간섭 채널 행렬

(820)를 업데이트할 수 있다. 송신 장치(110)는

에 제1 row 벡터(1410)를 추가하여

를 업데이트할 수 있다. 도 14에 도시된 예에서, 업데이트된

(1420)는 제1 row 벡터(1410)를 포함할 수 있다. When the square of the norm of the determined precoding matrix is less than the set transmit power (operation 1214-No), the transmitter 110 determines the second interference channel matrix in operation 1215.

(820) and

can be updated. For example, in the example shown in FIG. 14, the transmitter 110 converts the first row vector 1410 to the second interference channel matrix. The second interference channel matrix is removed in 820

(820) can be updated. The transmitting device 110 is

By adding the first row vector (1410) to

can be updated. In the example shown in FIG. 14 , the updated

1420 may include the first row vector 1410.

(1420)의 null 공간을 생성할 수 있고, 동작 1217에서 업데이트된

(1420)의 null 공간에 주어진 프리코딩 행렬(예:

)을 프로젝션할 수 있으며, 프로젝션의 결과에 따라 제2 벡터를 재차 결정(또는 업데이트)할 수 있다. 아래 수학식 9는 동작 1217에서 결정된 제2 벡터의 일례를 보여준다.Returning to FIG. 12 , in operation 1216 the sending device 110 updates the

(1420) can create a null space, updated in action 1217

A precoding matrix given in the null space of (1420), e.g.

) may be projected, and the second vector may be determined (or updated) again according to the result of the projection. Equation 9 below shows an example of the second vector determined in operation 1217.

일 수 있고, 송신 장치(110)는 동작 1217에서 제2 벡터를

에서 프로젝션 결과(또는 위 수학식 9의 연산 결과)로 업데이트할 수 있다.In the above-described operation 1211, the second vector is

, and the transmitter 110 generates the second vector in operation 1217.

It can be updated with the projection result (or the calculation result of Equation 9 above).

In operation 1212, the transmitter 110 may select a row vector having the highest correlation with the updated second vector (hereinafter, a second row vector) from the updated second interference channel matrix through Equation 6 above. .

In operation 1213, the transmitter 110 may determine (or update) a precoding matrix for the i-th transmission stream based on the updated second vector and the selected second row vector. For example, the transmitting device 110 may calculate α and β, respectively, through Equation 8 above, apply the minimum value of α and β to the updated second vector, and apply the minimum value to the second vector and i The precoding matrix for the i-th transmission stream may be updated by summing the precoding matrix for the i-th transmission stream according to Equation 7.

In operation 1214, the transmitter 110 may determine whether the square of the norm of the updated precoding matrix is greater than or equal to a set transmit power. The transmitting device 110 may perform a transmitting operation in operation 250 when the square of the norm of the updated precoding matrix is greater than or equal to the set transmission power (operation 1214-yes). The transmitting device 110 may repeat operations 1215, 1216, 1217, 1212, 1213, and 1214 when the square of the norm of the updated precoding matrix is less than the set transmit power (operation 1214-No). there is.

가 영행렬이 아닌 경우> <at action 1210

If is not a zero matrix>

가 영행렬이 아닌 경우(동작 1210-아니오), 동작 1216에서

의 null 공간을 생성할 수 있고, 동작 1217에서

의 null 공간에 주어진 프리코딩 행렬(예:

)을 프로젝션하여 벡터

(이하, 벡터

를 제3 벡터라 지칭함)를 결정할 수 있다. The transmitting device 110 is

is not a zero matrix (action 1210-no), at action 1216

can create a null space of , and at operation 1217

A precoding matrix given in the null space of , e.g.

) by projecting the vector

(hereafter, vector

(referred to as a third vector) may be determined.

In operation 1212, the transmitter 110 selects a row vector having the highest correlation with the third vector (hereinafter, referred to as “third row vector”) in the second interference channel matrix 820 through Equation 6 above. can

가 영행렬이 아닌 경우 i번째 송신 스트림에 대한 프리코딩 행렬은 한 번 이상 결정된 이력이 있다. 송신 장치(110)는 위 수학식 8을 통해 α와 β 각각을 계산할 수 있고, α와 β 중 최소값을 제3 벡터에 적용할 수 있으며, 최소값이 적용된 제3 벡터와 i번째 송신 스트림에 대한 프리코딩 행렬을 합산(sum)함으로써, i번째 송신 스트림에 대한 프리코딩 행렬을 업데이트할 수 있다.In operation 1213, the transmitter 110 may determine (or update) a precoding matrix for the i-th transmission stream based on the third vector and the third row vector. For example,

If is not a zero matrix, the precoding matrix for the i-th transmission stream has a history of being determined more than once. The transmitter 110 may calculate each of α and β through Equation 8 above, apply the minimum value of α and β to the third vector, and apply the minimum value to the third vector and the i-th transmission stream. By summing the coding matrices, the precoding matrix for the i-th transmission stream may be updated.

In operation 1214, the transmitter 110 may determine whether the square of the norm of the updated precoding matrix is greater than or equal to a set transmit power. The transmitting device 110 may perform a transmitting operation in operation 250 when the square of the norm of the updated precoding matrix is greater than or equal to the set transmission power (operation 1214-yes).

(820)과

를 업데이트할 수 있다. 일례로, 도 15에 도시된 예에서, 송신 장치(110)는 제3 row 벡터(1510)를 제2 간섭 채널 행렬

(820)에서 제거하여 제2 간섭 채널 행렬

(820)를 업데이트할 수 있다. 송신 장치(110)는

에 제3 row 벡터(1510)를 추가하여

를 업데이트할 수 있다. 업데이트된

(1520)에서 제3 row 벡터(1510)는 마지막 row에 위치할 수 있다.When the square of the norm of the updated precoding matrix is less than the set transmit power (operation 1214-No), the transmitter 110 determines the second interference channel matrix in operation 1215.

(820) and

can be updated. For example, in the example shown in FIG. 15, the transmitter 110 converts the third row vector 1510 to the second interference channel matrix.

The second interference channel matrix is removed in 820

(820) can be updated. The transmitting device 110 is

By adding the third row vector (1510) to

can be updated. updated

In 1520, the third row vector 1510 may be located in the last row.

(1520)의 null 공간을 생성할 수 있고, 동작 1217에서 업데이트된

(1520)의 null 공간에 주어진 프리코딩 행렬(예:

)을 프로젝션하여 제3 벡터를 재차 결정(또는 업데이트)할 수 있다. 일례로, 송신 장치(110)는 아래 수학식 10에 따라 제3 벡터를 재차 결정할 수 있다.Returning to FIG. 12 , in operation 1216 the sending device 110 updates the

(1520) can create a null space, updated in action 1217

A precoding matrix given in the null space of (1520), e.g.

) to determine (or update) the third vector again. For example, the transmitter 110 may re-determine the third vector according to Equation 10 below.

는 업데이트된

(1520)를 나타낼 수 있다.In Equation 10 above,

is updated

(1520).

In operation 1212, the transmitter 110 may select a row vector having the highest correlation with the re-determined third vector (hereinafter, referred to as a “fourth row vector”) from the updated second interference channel matrix.

In operation 1213, the transmitter 110 may determine (or update) a precoding matrix for the i-th transmission stream based on the re-determined third vector and the selected fourth row vector.

In operation 1214, the transmitter 110 may determine whether the square of the norm of the updated precoding matrix is greater than or equal to a set transmit power. The transmitting device 110 may perform a transmitting operation in operation 250 when the square of the norm of the updated precoding matrix is greater than or equal to the set transmission power (operation 1214-yes). The transmitting device 110 may repeat operations 1215, 1216, 1217, 1212, 1213, and 1214 when the square of the norm of the updated precoding matrix is less than the set transmit power (operation 1214-No). there is.

16 is a block diagram for explaining a transmission device according to various embodiments.

Referring to FIG. 16 , a transmitter 1600 (eg, the transmitter 110 of FIG. 1 ) may include an antenna module 1610 , a first communication module 1620 , and a processor 1630 .

According to various embodiments, the antenna module 1610 may include a plurality of antennas.

According to various embodiments, the first communication module 1620 transmits and receives a signal with a first terminal (eg, the terminal 120 of FIGS. 1 and 3) served by the transmitter 110 through the antenna module 1610 can do.

According to various embodiments, the first communication module 1620 may include a plurality of radio frequency (RF) chains capable of performing analog precoding (or analog beamforming).

According to various embodiments, the processor 1630 may be electrically connected to the first communication module 1620. The processor 1630 may perform digital precoding (or digital beamforming), and based on a result of digital precoding so that the first communication module 1620 and the antenna module 1610 may perform analog beamforming. The first communication module 1620 and the antenna module 1610 may be controlled.

According to various embodiments, the processor 1630 may include a communication processor.

(610))을 획득할 수 있다.According to various embodiments, the processor 1630 generates a channel matrix (eg, the channel of FIG. 6) between terminals (eg, terminals UE1 to UE12 of FIG. procession

(610)) can be obtained.

(610))로부터 단말들(예: 도 3의 단말들(UE1 내지 UE12)) 중 제1 단말이 아닌 다른 단말들(예: 도 3의 단말들(UE1 내지 UE4와 UE6 내지 UE12))과 송신 장치(1600) 사이의 채널 행렬에 해당하는 제1 간섭 채널 행렬(예: 도 7의 제1 간섭 채널 행렬

(720))을 획득할 수 있다.According to various embodiments, the processor 1630 may use the obtained channel matrix (eg, the channel matrix of FIG. 6

610) transmits with other terminals (eg, UEs UE1 to UE4 and UE6 to UE12 in FIG. 3) among terminals (eg, terminals UE1 to UE12 of FIG. 3) other than the first terminal A first interference channel matrix corresponding to a channel matrix between devices 1600 (e.g., the first interference channel matrix of FIG. 7)

(720)) can be obtained.

(820))을 획득할 수 있다. 일 실시 예에 있어서, 프로세서(1630)는 획득된 제1 간섭 채널 행렬 내의 복수의 벡터들 각각의 크기와 설정된 송신 전력(ρ)을 곱할 수 있고, 곱셈 결과들 중 설정된 간섭 세기(예:

)를 초과하는 벡터를 포함하는 제2 간섭 채널 행렬을 획득할 수 있다.According to various embodiments, the processor 1630 obtains a second interference channel matrix (eg, the second interference channel matrix of FIG. 8 ) that satisfies the interference strength condition from the first interference channel matrix obtained.

(820)) can be obtained. In an embodiment, the processor 1630 may multiply the size of each of the plurality of vectors in the obtained first interference channel matrix by the set transmit power ρ, and set interference strength (eg:

), a second interference channel matrix including a vector exceeding .

)과 획득된 제2 간섭 채널 행렬을 기초로 제1 단말의 송신 스트림에 대한 프리코딩 행렬을 결정할 수 있다.According to various embodiments, the processor 1630 may perform a given precoding matrix (eg:

) and the obtained second interference channel matrix, a precoding matrix for the transmission stream of the first terminal may be determined.

According to various embodiments, the processor 1630 may generate a null space (eg, the null space 1030 of FIG. 10) of the obtained second interference channel matrix, and project the given precoding matrix into the generated null space. to generate a first vector (eg, the first vector 1030 of FIG. 10). The processor 1630 may apply a first weight to the given precoding matrix, apply a second weight to the generated first vector, and apply the precoding matrix to which the first weight is applied and the first weight to which the second weight is applied. A precoding matrix for the transmission stream of the first terminal may be determined using the vector. In this regard, descriptions of FIGS. 9 to 11 may be applied, and detailed descriptions thereof are omitted.

)이 영행렬인지 여부를 판단할 수 있다. According to various embodiments, the processor 1630 may perform a first matrix (eg, in FIG. 12 ).

) is a zero matrix.

)을 기초로 제2 벡터(예: 도 12의 동작 1211에서의 제2 벡터)를 결정할 수 있다. 프로세서(1630)는 획득된 제2 간섭 채널 행렬 내의 복수의 벡터들 중 결정된 제2 벡터와 상관도가 가장 높은 벡터(예: 도 14의 row 벡터(1410))를 선택할 수 있다. According to various embodiments, the processor 1630 may, when the first matrix is a zero matrix, a given precoding matrix (eg:

), the second vector (eg, the second vector in operation 1211 of FIG. 12) may be determined. The processor 1630 may select a vector having the highest correlation with the determined second vector (eg, the row vector 1410 of FIG. 14 ) from among the plurality of vectors in the obtained second interference channel matrix.

)를 제1 단말의 송신 스트림에 대한 프리코딩 행렬로 결정할 수 있다. 다시 말해, 제1 행렬이 영행렬인 경우 위 수학식 7의 우변의

는 영행렬일 수 있고, 프로세서(1630)는 제1 단말의 송신 스트림에 대한 프리코딩 행렬을

로 결정할 수 있다.According to various embodiments, the processor 1630 may determine a precoding matrix for the transmission stream of the first terminal by using the selected vector. For example, the processor 1630 may determine whether the square of the norm of the matrix multiplication result between the selected vector and the determined second vector (eg, A in Equation 8 above) is greater than or equal to a set interference intensity. When the square of norm (eg, A in Equation 8 above) is less than the set interference strength, the processor 1630 calculates the selected vector, the square of the norm of the matrix multiplication result (eg, A in Equation 8 above), and the set interference strength A first value (eg, α in Equation 8 above) may be calculated based on . The processor 1630 may calculate the first value (eg, α in Equation 8 above) as 0 when the square of norm (eg, A in Equation 8 above) is equal to or greater than the set interference intensity. The processor 1630 may calculate the second value (eg, β in Equation 8 above) based on the norm of the given precoding matrix and the set transmit power. The processor 1630 may determine the minimum of the calculated first and second values as a weight, apply the determined weight to the selected vector, and apply the determined weight to the vector (eg, in Equation 7 above).

) may be determined as a precoding matrix for the transmission stream of the first terminal. In other words, when the first matrix is a zero matrix, the right side of Equation 7 above

may be a zero matrix, and the processor 1630 generates a precoding matrix for the transmission stream of the first terminal

can be determined by

(1420))의 null 공간을 생성할 수 있고, 생성된 null 공간에 주어진 프리코딩 행렬을 프로젝션할 수 있다. 프로세서(1630)는 프로젝션의 결과에 따라 제2 벡터를 업데이트할 수 있고, 업데이트된 제2 간섭 채널 행렬에서 업데이트된 제2 벡터(예: 도 12를 통해 설명한 업데이트된 제2 벡터)와 상관도가 가장 높은 벡터를 기초로 제1 단말의 송신 스트림에 대한 프리코딩 행렬을 업데이트할 수 있다.According to various embodiments, the processor 1630 may determine whether the determined precoding matrix satisfies a transmit power condition. For example, the processor 1630 may determine whether the square of the norm of the determined precoding matrix is less than a set transmit power. When the determined precoding matrix does not satisfy the transmit power condition, the processor 1630 may update the obtained second interference channel matrix by removing the selected vector from the obtained second interference channel matrix. The processor 1630 may update the first matrix by adding the selected vector to the first matrix. The processor 1630 performs an updated first matrix (e.g., the updated matrix of FIG. 14).

(1420)), and a given precoding matrix can be projected into the created null space. The processor 1630 may update the second vector according to the projection result, and the correlation with the updated second vector (eg, the updated second vector described with reference to FIG. 12) in the updated second interference channel matrix is A precoding matrix for the transmission stream of UE 1 may be updated based on the highest vector.

According to various embodiments, the processor 1630 may generate a null space of the first matrix when the first matrix is not a zero matrix (eg, operation 1210 - No). The processor 1630 may determine the third vector by projecting the given precoding matrix into the generated null space. The processor 1630 may select a vector having the highest correlation with the third vector from among a plurality of vectors in the obtained second interference channel matrix. The processor 1630 may determine or update a precoding matrix for the transmission stream of the first terminal by using the selected vector (eg, the third row vector 1510 of FIG. 15 ) and the determined third vector.

Since the embodiments described with reference to FIGS. 1 to 15 may be applied to FIG. 16 , a detailed description thereof is omitted.

According to various embodiments, the transmitting device 110 or 1600 may transmit/receive a signal through the antenna module 1610 and the first terminal 120 served by the transmitting device 110 or 1600 and the antenna module 1610. It may include a communication module 1620 and a processor 1630 electrically connected to the first communication module 1620 . The processor 1630 obtains a channel matrix between the terminals that have performed reception beamforming and the transmitter 110 or 1600, and from the obtained channel matrix, other terminals other than the first terminal among the terminals and the transmission device 110, 1600. A first interference channel matrix corresponding to a channel matrix between transmitting devices is obtained, a second interference channel matrix satisfying an interference strength condition is obtained from the obtained first interference channel matrix, and a given precoding matrix and the obtained A precoding matrix for the transmission stream of the first terminal may be determined based on the second interference channel matrix.

According to various embodiments, the processor 1630 multiplies the size of each of the plurality of vectors in the obtained first interference channel matrix by a set transmit power, and the multiplication result includes the vector exceeding the set interference strength. A second interference channel matrix may be obtained.

According to various embodiments, the processor 1630 generates a null space of the obtained second interference channel matrix and projects the given precoding matrix onto the generated null space to obtain a first vector Generates, applies a first weight to the given precoding matrix, applies a second weight to the generated first vector, and applies the precoding matrix to which the first weight is applied and the first vector to which the second weight is applied It is possible to determine the precoding matrix for the transmission stream using

According to various embodiments, the processor 1630 performs matrix multiplication on the obtained second interference channel matrix and the given precoding matrix, and determines between the square of the maximum norm of the result of the matrix multiplication and the set interference strength. It is determined whether the ratio of is within a certain range, and if the ratio is within the certain range, the first weight is determined using the ratio, the norm of the generated first vector, the determined first weight , and the second weight may be determined based on the norm of the given precoding matrix.

According to various embodiments, when the ratio does not fall within the predetermined range, the processor 1630 may determine a first value as the first weight and a second value as the second weight.

According to various embodiments, the processor 1630 may set the first value to 1 and the second value to 0.

According to various embodiments, the processor 1630 determines whether a first matrix is a zero matrix, and if the first matrix is the zero matrix, determines a second vector based on the given precoding matrix, and Among a plurality of vectors in the obtained second interference channel matrix, a vector having the highest correlation with the determined second vector may be selected, and the precoding matrix for the transmission stream may be determined using the selected vector.

According to various embodiments, when the determined precoding matrix does not satisfy a transmit power condition, the processor 1630 removes the selected vector from the obtained second interference channel matrix to form the obtained second interference channel matrix. update the first matrix by adding the selected vector to the first matrix, generate a null space of the updated first matrix, and apply the given precoding matrix to the generated null space; project, update the determined second vector according to a result of the projection, and update the determined precoding matrix based on a vector having the highest correlation with the updated second vector in the updated second interference channel matrix can do.

According to various embodiments, the processor 1630 determines whether the square of the norm of the matrix multiplication result between the selected vector and the determined second vector is greater than or equal to a set interference strength, and the square of the norm is less than the set interference strength In this case, a first value is calculated based on the selected vector, the square of the norm of the matrix multiplication result, and the set interference strength, and a second value based on the norm of the given precoding matrix and the set transmit power Calculate , determine the minimum of the calculated first and second values as a weight, apply the determined weight to the selected vector, and determine the vector to which the determined weight is applied as the precoding matrix.

According to various embodiments, the processor 1630 may calculate the first value as 0 when the square of the norm of the matrix multiplication result is greater than or equal to the set interference strength.

According to various embodiments, the processor 1630 determines whether the first matrix is a zero matrix, and if the first matrix is not the zero matrix, generates a null space of the first matrix, and A third vector is determined by projecting the given precoding matrix onto a space, a vector having the highest correlation with the determined third vector is selected from among a plurality of vectors in the obtained second interference channel matrix, and the selected vector The precoding matrix for the transmission stream may be determined using the determined third vector.

According to various embodiments, a method of operating the transmitter 110 or 1600 may include obtaining a channel matrix between terminals that have performed Rx beamforming and the transmitter 110 or 1600, and obtaining the terminal from the obtained channel matrix. Obtaining a first interference channel matrix corresponding to a channel matrix between the transmitter (110, 1600) and other terminals other than the first terminal served by the transmitter among the interference matrix from the obtained first interference matrix Acquiring a second interference channel matrix that satisfies an intensity condition, and determining a precoding matrix for a transmission stream of the first terminal based on a given precoding matrix and the obtained second interference channel matrix. can do.

According to various embodiments, the obtaining of the second interference channel matrix is performed by multiplying the size of each of the plurality of vectors in the obtained first interference channel matrix by a set transmit power, and exceeding a set interference strength among the multiplication results. and obtaining the second interference channel matrix including a vector of

According to various embodiments, the determining of the precoding matrix may include generating a null space of the obtained second interference channel matrix, projecting the given precoding matrix onto the generated null space, and Generating 1 vector, applying a first weight to the given precoding matrix, and applying a second weight to the generated first vector, and applying the first weight to the precoding matrix and the second weight It may include an operation of determining the precoding matrix for the transmission stream using a first vector to which is applied.

According to various embodiments, the applying operation may include performing matrix multiplication on the obtained second interference channel matrix and the given precoding matrix, squaring a maximum norm of a result of the matrix multiplication, and set interference intensity An operation of determining whether a ratio between the ratios belongs to a certain range, and if the ratios belong to the certain ranges, the first weight is determined using the ratio, and the norm of the generated first vector, the determined and determining the second weight based on the first weight and the norm of the given precoding matrix.

According to various embodiments, the applying operation may further include determining a first value as the first weight value and determining a second value as the second weight value when the ratio does not belong to the predetermined range. there is.

According to various embodiments, the determining of the precoding matrix may include determining whether a first matrix is a zero matrix, and if the first matrix is a zero matrix, a second vector based on the given precoding matrix An operation of determining a vector having the highest correlation with the determined second vector among a plurality of vectors in the obtained second interference channel matrix, and an operation of selecting a vector having the highest correlation with the determined second vector, and using the selected vector to perform the preprocessing for the transmission stream. An operation of determining a coding matrix may be included.

According to various embodiments, when the determined precoding matrix does not satisfy a transmit power condition, updating the obtained second interference channel matrix by removing the selected vector from the obtained second interference channel matrix; Updating the first matrix by adding a selected vector to the first matrix, generating a null space of the updated first matrix, projecting the given precoding matrix onto the generated null space, Updating the determined second vector according to a result of the projection, and updating the determined precoding matrix based on a vector having the highest correlation with the updated second vector in the updated second interference channel matrix. Actions may be included.

According to various embodiments, the operation of determining the precoding matrix for the transmission stream using the selected vector determines whether the square of the norm of a matrix multiplication result between the selected vector and the determined second vector is greater than or equal to a set interference strength. determining whether the square of the norm is less than the set interference strength, calculating a first value based on the selected vector, the square of the norm of the matrix multiplication result, and the set interference strength, the given free Calculating a second value based on the norm of the coding matrix and the set transmission power, determining the minimum of the calculated first and second values as a weight, and applying the determined weight to the selected vector, An operation of determining a weighted vector as the precoding matrix may be included.

According to various embodiments, the determining of the precoding matrix may include determining whether a first matrix is a zero matrix, and generating a null space of the first matrix if the first matrix is not a zero matrix. determining a third vector by projecting the given precoding matrix onto the generated null space; a vector having the highest correlation with the determined third vector among a plurality of vectors in the acquired second interference channel matrix; and determining the precoding matrix for the transmission stream using the selected vector and the determined third vector.

1600: transmission device
1610: antenna module
1620: first communication module
1630: processor

Claims (20)

In the transmitting device,
antenna module;
a first communication module for transmitting and receiving a signal with a first terminal served by the transmitting device through the antenna module; and
Processor electrically connected to the first communication module
including,
the processor,
Obtaining a channel matrix between terminals that have performed reception beamforming and the transmitting device, and obtaining a channel matrix between the transmitting device and other terminals other than the first terminal among the terminals from the obtained channel matrix A first interference channel matrix is obtained, a second interference channel matrix satisfying an interference strength condition is obtained from the obtained first interference channel matrix, and the second interference channel matrix is obtained based on a given precoding matrix and the obtained second interference channel matrix. Determining a precoding matrix for a transmission stream of a first terminal,
sending device.
According to claim 1,
the processor,
Multiplying the size of each of the plurality of vectors in the obtained first interference channel matrix by a set transmit power, and obtaining the second interference channel matrix including a vector exceeding the set interference strength among the multiplication results,
sending device.
According to claim 1,
the processor,
A null space of the obtained second interference channel matrix is generated, a first vector is generated by projecting the given precoding matrix into the generated null space, and a first vector is generated by projecting the given precoding matrix into the obtained null space. Applying a weight of 1, applying a second weight to the generated first vector, and using the precoding matrix to which the first weight is applied and the first vector to which the second weight is applied The precoding for the transmission stream determining the matrix,
sending device.
According to claim 3,
the processor,
Perform matrix multiplication on the obtained second interference channel matrix and the given precoding matrix, and determine whether the ratio between the square of the maximum norm of the result of the matrix multiplication and the set interference intensity falls within a certain range And, if the ratio belongs to the predetermined range, the first weight is determined using the ratio, and based on the norm of the generated first vector, the determined first weight, and the norm of the given precoding matrix To determine the second weight,
sending device.
According to claim 4,
the processor,
determining a first value as the first weight and a second value as the second weight when the ratio does not belong to the predetermined range;
sending device.
According to claim 5,
The first value is 1 and the second value is 0,
sending device.
According to claim 1,
the processor,
It is determined whether the first matrix is a zero matrix, and if the first matrix is the zero matrix, a second vector is determined based on the given precoding matrix, and a plurality of vectors in the obtained second interference channel matrix are determined. selecting a vector having the highest correlation with the determined second vector among them, and determining the precoding matrix for the transmission stream using the selected vector;
sending device.
According to claim 7,
the processor,
When the determined precoding matrix does not satisfy the transmit power condition, the obtained second interference channel matrix is updated by removing the selected vector from the obtained second interference channel matrix, and the selected vector is converted into the first matrix. In addition to updating the first matrix, generating a null space of the updated first matrix, projecting the given precoding matrix into the generated null space, and according to a result of the projection, the determined Updating a second vector and updating the determined precoding matrix based on a vector having the highest correlation with the updated second vector in the updated second interference channel matrix;
sending device.
According to claim 7,
the processor,
It is determined whether the square of the norm of the matrix multiplication result between the selected vector and the determined second vector is greater than or equal to the set interference strength, and if the square of the norm is less than the set interference strength, the selected vector and the matrix multiplication result Calculate a first value based on the square of the norm and the set interference strength, calculate a second value based on the norm of the given precoding matrix and the set transmit power, and the calculated first and second values determining the minimum of 2 values as a weight, applying the determined weight to the selected vector, and determining the vector to which the determined weight is applied as the precoding matrix;
sending device.
According to claim 9,
the processor,
Calculating the first value as 0 when the square of the norm of the matrix multiplication result is equal to or greater than the set interference strength,
sending device.
According to claim 1,
the processor,
It is determined whether the first matrix is a zero matrix, and if the first matrix is not the zero matrix, a null space of the first matrix is generated, and the given precoding matrix is projected onto the generated null space to obtain a first matrix. 3 vectors are determined, a vector having the highest correlation with the determined third vector is selected among a plurality of vectors in the obtained second interference channel matrix, and the transmission is performed using the selected vector and the determined third vector. determining the precoding matrix for a stream;
sending device.
In the operating method of the transmitting device,
obtaining channel matrices between terminals that have performed reception beamforming and the transmission device;
obtaining a first interference channel matrix corresponding to a channel matrix between the transmitter and other terminals other than the first terminal served by the transmitter among the terminals from the obtained channel matrix;
obtaining a second interference channel matrix that satisfies an interference strength condition from the obtained first interference matrix; and
Determining a precoding matrix for the transmission stream of the first terminal based on the given precoding matrix and the obtained second interference channel matrix
including,
How the transmitting device operates.
According to claim 12,
The operation of obtaining the second interference channel matrix,
multiplying the size of each of the plurality of vectors in the obtained first interference channel matrix by a set transmit power, and acquiring the second interference channel matrix including a vector exceeding the set interference strength among the multiplication results
including,
How the transmitting device operates.
According to claim 12,
The operation of determining the precoding matrix,
generating a null space of the obtained second interference channel matrix;
generating a first vector by projecting the given precoding matrix into the generated null space;
applying a first weight to the given precoding matrix and applying a second weight to the generated first vector; and
Determining the precoding matrix for the transmission stream using the precoding matrix to which the first weight is applied and the first vector to which the second weight is applied
including,
How the transmitting device operates.
According to claim 14,
The operation to be applied is
performing matrix multiplication on the obtained second interference channel matrix and the given precoding matrix;
determining whether a ratio between a square of a maximum norm of a result of the matrix multiplication and a set interference intensity falls within a predetermined range; and
When the ratio falls within the predetermined range, the first weight is determined using the ratio, and the norm of the generated first vector, the determined first weight, and the norm of the given precoding matrix are converted into the second action to determine the weight
including,
How the transmitting device operates.
According to claim 15,
The operation to be applied is
When the ratio does not belong to the predetermined range, determining a first value as the first weight and determining a second value as the second weight
Including more,
How the transmitting device operates.
According to claim 12,
The operation of determining the precoding matrix,
determining whether the first matrix is a zero matrix;
determining a second vector based on the given precoding matrix when the first matrix is the zero matrix;
selecting a vector having the highest correlation with the determined second vector among a plurality of vectors in the obtained second interference channel matrix; and
Determining the precoding matrix for the transmission stream using the selected vector
including,
How the transmitting device operates.
According to claim 17,
updating the obtained second interference channel matrix by removing the selected vector from the obtained second interference channel matrix when the determined precoding matrix does not satisfy a transmit power condition;
updating the first matrix by adding the selected vector to the first matrix;
generating a null space of the updated first matrix;
projecting the given precoding matrix onto the generated null space and updating the determined second vector according to a result of the projection;
Updating the determined precoding matrix based on a vector having the highest correlation with the updated second vector in the updated second interference channel matrix
including,
How the transmitting device operates.
According to claim 17,
The operation of determining the precoding matrix for the transmission stream using the selected vector,
determining whether a square of a norm of a result of matrix multiplication between the selected vector and the determined second vector is greater than or equal to a set interference intensity;
calculating a first value based on the selected vector, the square of the norm of the matrix multiplication result, and the set interference intensity when the square of the norm is less than the set interference strength;
calculating a second value based on the norm of the given precoding matrix and the set transmit power;
determining a minimum of the calculated first and second values as a weight; and
An operation of applying the determined weight to the selected vector and determining a vector to which the determined weight is applied as the precoding matrix
including,
How the transmitting device operates.
According to claim 12,
The operation of determining the precoding matrix,
determining whether the first matrix is a zero matrix;
generating a null space of the first matrix when the first matrix is not the zero matrix;
determining a third vector by projecting the given precoding matrix into the generated null space;
selecting a vector having the highest correlation with the determined third vector among a plurality of vectors in the obtained second interference channel matrix; and
Determining the precoding matrix for the transmission stream using the selected vector and the determined third vector
including,
How the transmitting device operates.

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