KR20200091603A - Apparatus and method for controlling performance of receiver for sub-device in mimo cognitive radio systems - Google Patents

Abstract

According to the present invention, an apparatus for controlling the performance of a receiver for a sub terminal of a multiple-input multiple-output (MIMO) cognitive wireless communication system may comprise: a channel state information collection unit for collecting channel state information by receiving a signal from a main terminal of MIMO cognitive wireless communication; an orthogonal beamforming matrix calculation unit which calculates a covariance matrix of a main terminal channel and a subspace of noise based on the signal strength included in the collected channel state information; and an antenna weight optimization unit which calculates an antenna weight orthogonal to a channel with the main terminal based on the calculation result and then applies the antenna weight to the receiver of the sub terminal.

Description

A receiver performance control device and a method of a sub terminal of a MIMO-aware wireless communication system{APPARATUS AND METHOD FOR CONTROLLING PERFORMANCE OF RECEIVER FOR SUB-DEVICE IN MIMO COGNITIVE RADIO SYSTEMS}

The present invention relates to a technique for controlling the performance of a receiver mounted on a wireless terminal, and more particularly, to a sub terminal based on signal strength received from a main terminal of a multiple-input multiple-output (MIMO) cognitive wireless communication system. The present invention relates to a receiver performance control apparatus and method for a sub terminal of a MIMO-aware wireless communication system capable of controlling the performance of a mounted receiver.

As is known, the concept of Cognitive Radio (CR) is that when a main terminal (main user terminal) licensed for a specific frequency band is not using the licensed frequency band, the sub terminal (secondary user terminal) is main. It is a communication method using a frequency band permitted for a terminal.

Recently, due to the advancement and diversification of the military tactical radio communication system, the frequency demand is explosively increasing, but the additional frequency acquisition environment is gradually becoming difficult.

In particular, the current military frequency occupies about 25% or more of the entire domestic spectrum band, and additional stable operation is possible due to the modernization plan of military tactical radio communication equipment since the 2000s, the development of military technology, and the network before joint operation. It is necessary to secure more frequencies.

In response to this frequency shortage problem, the CR technology is drawing attention as a core technology that can improve the frequency utilization efficiency per region by sharing the frequency being used by the main terminal by the sub-terminals, and the CR technology of the future small unit radio (wireless terminal) It is expected to develop into an intelligent walkie-talkie.

Here, the CR technology is a technology that intelligently judges the spectrum status and selects the frequency, modulation method, output, etc., and intelligently recognizes and changes the tactical communication environment that changes every time when applied to radio communication of small units. Since it is possible to automatically change the frequency band and communication parameters, it is expected to construct a high-performance, high-efficiency military communication system within a limited military frequency band.

However, when a sub-terminal coexists and communicates when the main terminal is actually using a specific frequency band, interference caused by the sub-terminal to the receiver of the main terminal or the main terminal to the receiver of the sub-terminal may degrade overall network performance. Therefore, it is urgently needed to research and secure original technology for effective MIMO transceiver structure design that can control this.

Therefore, there is a need to study orthogonal beamforming interference control transmission/reception technology of a sub terminal through multiple antennas.

Here, orthogonal beamforming is a technique that uses an antenna weight orthogonal to the interference channel to the main terminal in order to remove interference from the sub terminal to the main terminal. The interference effect on the terminal can be minimized.

However, when designing a receiver using an orthogonal beamforming technique to reduce the influence of interference, if the magnitude of interference from the main terminal is not taken into consideration, a problem that may degrade performance may occur.

Therefore, in order to solve the performance degradation problem of the receiver according to the size of the interference, a technique for designing a receiver of the sub terminal according to the amount of interference from the main terminal is required.

Korean Patent Publication No. 2012-0126572 (Publication Date: 2012. 11. 21.)

The present invention is to provide a receiver performance control apparatus and method for a receiver of a sub terminal of a MIMO cognitive wireless communication system that can adaptively control receiver performance of a sub terminal based on the amount of interference from the main terminal in the cognitive wireless communication system. do.

The present invention allows a processor to perform a method for controlling a receiver performance of a sub terminal of a MIMO cognitive wireless communication system that can adaptively control receiver performance of a sub terminal based on the amount of interference from a main terminal in a cognitive wireless communication system. It is intended to provide a computer readable recording medium in which a computer program is stored.

The problem to be solved by the present invention is not limited to those mentioned above, and another problem to be solved that is not mentioned can be clearly understood by a person having ordinary knowledge to which the present invention belongs from the following descriptions. will be.

According to an aspect of the present invention, based on a signal strength included in the collected channel state information, and a channel state information collection unit that receives a signal from a main terminal of MIMO-aware wireless communication and collects channel state information, the main An orthogonal beamforming matrix calculation unit that calculates a sub-space of noise and a covariance matrix of a terminal channel, and calculates an antenna weight orthogonal to a channel with the main terminal based on the calculation result and applies it to the receiver of the sub terminal It is possible to provide a receiver performance control apparatus for a sub terminal of a MIMO-aware wireless communication system including an antenna weight optimization unit.

The channel state information of the present invention may include a covariance matrix of the channel.

The orthogonal beamforming matrix calculator of the present invention may determine the signal strength according to a preset interference amount threshold of the communication system.

The antenna weight optimizer of the present invention may calculate the antenna weight through eigenvalue decomposition of a covariance matrix of a channel with the main terminal.

The antenna weight optimizer of the present invention may calculate the eigenvalue decomposition by specifying a subspace of noise.

According to another aspect of the present invention, receiving a signal from a main terminal of MIMO-aware wireless communication to collect channel state information, and based on the signal strength included in the collected channel state information, covariance of the main terminal channel Calculating a matrix, and calculating an antenna weight orthogonal to a channel with the main terminal based on the calculated covariance matrix, and then applying the antenna weight to the sub terminal, and then applying it to the sub terminal. It is possible to provide a method for controlling receiver performance.

The channel state information of the present invention may include a covariance matrix of the channel.

In the calculating step of the present invention, the signal strength may be determined according to a preset interference amount threshold of the communication system.

In the calculating step of the present invention, when the signal strength is greater than the preset interference amount threshold, the covariance matrix may be calculated.

In the applying step of the present invention, the antenna weight may be calculated through eigenvalue decomposition of a covariance matrix of a channel with the main terminal.

The eigenvalue decomposition of the present invention can be calculated by specifying a subspace of noise.

According to another aspect of the present invention, a computer readable recording medium storing a computer program for a processor to perform a method for controlling a receiver performance of a sub-terminal of a MIMO-aware wireless communication system, wherein the receiver performance control method is a MIMO-aware wireless Receiving a signal from a main terminal of communication and collecting channel state information; calculating a covariance matrix of a main terminal channel based on the signal strength included in the collected channel state information; and calculating the calculated covariance matrix. Based on the above, it is possible to provide a computer-readable recording medium comprising calculating an antenna weight orthogonal to a channel with the main terminal and applying it to the sub terminal.

According to an embodiment of the present invention, the receiver performance of the sub terminal can be maximized by adaptively controlling the receiver performance of the sub terminal based on the magnitude of interference from the main terminal in the MIMO-aware wireless communication system.

According to an embodiment of the present invention, in a situation in which a main terminal generating an interference signal exists, receiver performance of the sub terminal can be further improved.

1 is a conceptual diagram showing a schematic configuration of a MIMO-aware wireless communication system to which the present invention can be applied.
2 is a block diagram of a receiver performance control apparatus that may be included in a sub-terminal of a MIMO-aware wireless communication system according to an embodiment of the present invention.
FIG. 3 is a graph showing an achievable rate when orthogonal beamforming is performed according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only these embodiments allow the disclosure of the present invention to be complete, and have ordinary knowledge in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the scope of the invention is only defined by the claims.

In describing the embodiments of the present invention, detailed descriptions of known functions or configurations will be omitted except when actually necessary in describing the embodiments of the present invention. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing a schematic configuration of a MIMO-aware wireless communication system to which the present invention can be applied.

Referring to FIG. 1, a multiple-input multiple-output (MIMO)-aware wireless communication system may include a main terminal (MD1) having a single or multiple antennas, a plurality of sub terminals (SD1, SD2) having multiple antennas, and the like. have.

Here, each of the sub-terminals (SD1, SD2) may include a receiver performance control device of a sub-terminal provided according to an embodiment of the present invention, where the receiver performance control device is, for example, orthogonal beamforming of the receiver It can be defined as a device.

In addition, the main terminal may be defined as a primary user terminal or a primary terminal, and the sub terminal may be defined as a secondary user terminal or a secondary terminal. Such a main terminal and a sub terminal are used in, for example, a military tactical wireless communication system. It may mean a possible wireless terminal, an intelligent wireless terminal, a walkie-talkie, an intelligent walkie-talkie, and the like.

2 is a block diagram of a receiver performance control apparatus 200 that may be included in a sub-terminal of a MIMO-aware wireless communication system according to an embodiment of the present invention, wherein the receiver performance control apparatus 200 of a sub-terminal is channel state information It may include a collection unit 202, an orthogonal beamforming matrix calculation unit 204, an antenna weight optimization unit 206, and the like.

Referring to FIG. 2, the channel state information collecting unit 202 receives a signal from a main terminal by a sub terminal of MIMO-aware wireless communication including at least one receiver, that is, channel state information (for example, a signal received from the main terminal). , Signal strength, channel covariance matrix, etc.). Here, the collected channel state information may be transmitted to the orthogonal beamforming matrix calculator 204.

Next, the orthogonal beamforming matrix calculator 204 calculates a sub-space of the covariance matrix and noise of the channel from the main terminal based on the signal strength included in the channel state information collected from the signal of the main terminal. Can provide. The calculation result can be transmitted to the antenna weight optimization unit 206 in the next stage.

Here, the orthogonal beamforming matrix calculator 204 may determine the strength of the signal received from the main terminal according to a preset interference threshold of the communication system (sub terminal).

Then, the antenna weight optimization unit 206 calculates the antenna weight orthogonal to the channel with the main terminal based on the calculation result provided from the orthogonal beamforming matrix calculation unit 204, and the calculated antenna weight is sub-terminal It can provide a function such as applied to the receiver of the receiver (applying a weight to improve the performance of the receiver).

Here, the calculation of the antenna weight may mean calculation of an orthogonal beamforming matrix and a linear beamforming matrix.

At this time, the antenna weight optimization unit 206 may calculate the antenna weight through eigenvalue decomposition of the covariance matrix of the channel with the main terminal, and calculate the eigenvalue decomposition by specifying a subspace of noise.

Next, with reference to FIGS. 1 and 2, a series of processes for improving the performance of a receiver mounted in a sub terminal of a MIMO-aware wireless communication system according to an embodiment of the present invention will be described.

으로, 서브 단말의 안테나 수는

으로 각각 정의될 수 있다.Referring to FIG. 1, the receiver of the sub terminal SD1 receives a signal from the main terminal MD1 in order to cope with the interference of the main terminal MD1, wherein the main terminal received at the receiver of the sub terminal SD1 ( The signal of MD1) may be expressed as Equation 1 below. Here, the number of antennas of the main terminal

The number of antennas of the sub terminal is

Can be defined respectively.

[Equation 1]

의

는 메인 단말(MD1)로부터 송신되는 신호를 나타내고, 크기

의

은 메인 단말(MD1)이 서브 단말(SD1)에게 신호를 송신할 때의 채널을 나타내며, 크기

의

은 서브 단말 수신기에서의 시스템 잡음을 나타내고, 크기

의

는 서브 단말(SD1)의 수신기가 받는 수신신호를 나타내며,

은 서브 단말(SD1)이 메인 단말(MD1)의 신호를 수신하는 시간을 나타낸다.In Equation 1 above, the size

of

Indicates a signal transmitted from the main terminal MD1, and the magnitude

of

silver Indicates the channel when the main terminal MD1 transmits a signal to the sub terminal SD1, and the size

of

Denotes the system noise in the sub terminal receiver, and the magnitude

of

Indicates a received signal received by the receiver of the sub terminal SD1,

Indicates a time when the sub terminal SD1 receives the signal of the main terminal MD1.

이 시간에 따라 독립적이고 동일한 분포를 가지고 있으며,

의 공분산 행렬을 가지고 있으면, 메인 단말로부터 수신된 신호의 세기는 다음의 수학식 2와 표현될 수 있다.At this time, the signal of the main terminal (MD1)

It is independent and has the same distribution over time,

If has a covariance matrix of, the strength of the signal received from the main terminal can be expressed by the following equation (2).

[Equation 2]

는 전술한 수학식 1의 변수와 동일하고,

는 에르미트 행렬을 나타내며,

은 서브 단말(SD1)이 메인 단말(SD1)으로부터 수신하는 신호의 세기를 나타낸다.In Equation 2 above,

Is the same as the variable in Equation 1 above,

Denotes the Hermitian matrix,

Indicates a signal strength received by the sub terminal SD1 from the main terminal SD1.

When the above-described value of Equation 2 (signal strength) is greater than a preset interference amount threshold in the communication system (sub terminal), a covariance matrix is estimated and an orthogonal beamforming matrix is calculated.

이 시간에 따라 독립적이고 동일한 분포를 가지고 있으며, 크기가

인

의 공분산 행렬을 가지고 있고, 잡음

은 평균 0, 크기가

인 공분산 행렬

를 가지는 독립적이고 순환 대칭 복소 가우시안 분포를 따른다면, 공분산 행렬은 다음의 수학식 3과 같이 추정될 수 있다.Here, the signal of the main terminal (MD1)

It is independent and has the same distribution over time, and its size

sign

Has a covariance matrix of, noise

Is average 0, the size

Phosphorus covariance matrix

If the independent and cyclically symmetric complex Gaussian distribution is followed, the covariance matrix can be estimated as in Equation 3 below.

[Equation 3]

와

은 전술한 수학식 1의 변수와 동일하고,

는 잡음의 분산을 나타내며,

는 메인 단말(MD1)의 신호의 분산을 나타내고, 크기

의

는 단위행렬을 나타내며,

은 서브 단말(SD1)이 메인 단말(SD1)으로부터 수신하는 신호의 공분산 행렬을 나타낸다.In the above equation (3),

Wow

Is the same as the variable in Equation 1 above,

Denotes the dispersion of noise,

Denotes the variance of the signal of the main terminal MD1, and the magnitude

of

Denotes a unit matrix,

Denotes the covariance matrix of the signal received by the sub terminal SD1 from the main terminal SD1.

Then, the eigenvalue decomposition from the covariance matrix estimated through Equation 3 described above may be performed as shown in Equation 4 below.

[Equation 4]

는 크기가

인 메인 단말(MD1)의 신호의 부공간 행렬이고,

는 크기가

인 잡음의 부공간 행렬이며,

는

의 가장 큰 고유값

개를 포함한 대각 행렬이다. 여기에서,

임을 알 수 있다.In the above equation (4),

Has a size

It is a sub-space matrix of the signal of the main terminal (MD1),

Has a size

Is the subspatial matrix of phosphorus noise,

The

Largest eigenvalue of

It is a diagonal matrix containing a dog. From here,

You can see that

에 투사하는 직교 빔포밍 기술을 사용하면, 메인 단말(MD1)의 간섭을 줄이고 통신 성능을 향상 시킬 수 있다.Accordingly, the signal received by the sub terminal SD1 is a subspace of noise.

By using orthogonal beamforming technology projected on, it is possible to reduce interference of the main terminal MD1 and improve communication performance.

개의 자유도를 잃는다. 반면에, 만약

의 크기가 2보다 클 경우, 남은 자유도를 활용할 수 있다. 그럴 경우 직교 빔포밍이 포함된 수신 빔포밍

는 아래 수학식 5와 같이 표현될 수 있다.However, when the signal received by the sub terminal SD1 is projected into the sub-space of the above-described noise, the receiving antenna

Dogs lose freedom. On the other hand, if

If the size of is greater than 2, the remaining degrees of freedom can be utilized. If so, receive beamforming with orthogonal beamforming

Can be expressed as Equation 5 below.

[Equation 5]

는 전술한 수학식 4와 동일하고, 크기

의

는 자유도를 최대한 활용하는 최대비 결합 등의 어떤 수신 빔포밍을 나타내며, 크기

의

는 직교 빔포밍을 포함하여 설계된 수신 빔포밍을 나타낸다.In the above equation (5),

Is the same as Equation 4 described above, and the size

of

Denotes any received beamforming such as maximum ratio combining that makes the most of the degree of freedom, and

of

Denotes receive beamforming designed including orthogonal beamforming.

Next, in a situation where the main terminal MD1 is still communicating in the frequency band permitted to it, when the sub terminal SD1 communicates, the signal received by the sub terminal SD1 is as shown in Equation 6 below. Can be expressed.

[Equation 6]

In the above equation (6), x represents a signal transmitted from the sub terminal SD2,

의

는 송신 신호의 안테나 가중치를 나타내며,

는 크기가

인 서브 단말(SD2)이 서브 단말(SD1)에게 송신할 때의 채널을 나타내고,

는 전치 행렬을 나타내고,

와

은 전술한 수학식 1의 변수와 동일하며, 크기

의

은 서브 단말 수신기에서의 시스템 잡음을 나타내고, 크기

의

는 서브 단말(SD1)의 수신기가 받는 수신 신호를 나타낸다.size

of

Denotes the antenna weight of the transmitted signal,

The Size

Indicates the channel when the in-sub-terminal SD2 transmits to the sub-terminal SD1 ,

Denotes the transpose matrix,

Wow

Is the same as the variable in Equation 1 described above, and the size

of

Denotes the system noise in the sub terminal receiver, and the magnitude

of

Indicates a received signal received by the receiver of the sub terminal SD1.

로 위의 수신 신호[수학식 6]를 직교 빔포밍을 포함하여 설계된 수신 빔포밍을 하면 다음의 수학식 7에서와 같이 메인 단말(MD1)로부터의 간섭이 없어진다.Here, exactly estimated

When receiving beamforming designed with orthogonal beamforming on the received signal [Equation 6] on the furnace, interference from the main terminal MD1 is eliminated as in Equation 7 below.

[Equation 7]

는 전술한 수학식 5와 동일하고,

,

,

와

은 전술한 수학식 6의 변수와 동일하며,

는 서브 단말(SD1) 수신기가 받은 수신 신호에 직교 빔포밍 기술을 사용한 신호를 나타낸다.In the above equation (7),

Is the same as Equation 5 above,

,

,

Wow

Is the same as the variable in Equation 6 above,

Denotes a signal using an orthogonal beamforming technique on a received signal received by a sub terminal (SD1) receiver.

Here, an achievable rate of a receiver having received beamforming designed including orthogonal beamforming may be expressed as Equation 8 below.

[Equation 8]

는 전술한 수학식 3과 동일하고,

는 전술한 수학식 5와 동일하며,

와

는 전술한 수학식 6의 변수와 동일하고,

는 켤레 행렬을 나타내며,

는 서브 단말(SD1) 수신기의 가능 레이트를 나타낸다.In Equation 8 above,

Is the same as Equation 3 above,

Is the same as Equation 5 above,

Wow

Is the same as the variable in Equation 6 above,

Denotes a conjugate matrix,

Indicates a possible rate of the sub terminal (SD1) receiver.

If the magnitude of the interference from the main terminal MD1 is not large and the value of Equation 7 described above is smaller than the interference amount threshold designed by the system, losing the degree of freedom with the orthogonal beamforming matrix may degrade the performance of the receiver. have.

를 전술한 수학식 6에 적용할 수 있는데, 이럴 경우 수신신호는 다음의 수학식 9와 같이 표현될 수 있다.In this case, it does not estimate the covariance matrix and compute the orthogonal beamforming matrix, but instead receives other beamforming such as maximum ratio combining that makes the most of the degree of freedom.

Can be applied to the above equation (6), in which case the received signal can be expressed as the following equation (9).

[Equation 9]

의

는 수신 빔포밍을 나타내고,

와

은 전술한 수학식 1의 변수와 동일하며,

,

,

와

은 전술한 수학식 6의 변수와 동일하고,

는 서브 단말(SD1) 수신기가 받은 수신 신호에 어떤 선형 수신 빔포밍 기술을 사용한 신호를 나타낸다.In Equation 9 above, the size

of

Indicates reception beamforming,

Wow

Is the same as the variable in Equation 1 above,

,

,

Wow

Is the same as the variable in Equation 6 above,

Denotes a signal using a linear reception beamforming technique in the received signal received by the sub terminal (SD1) receiver.

In this case, the achievable rate of the linear reception beamformed receiver may be expressed as Equation 10 below.

[Equation 10]

는 서브 단말(SD2)의 신호의 세기를 나타내고,

와

는 전술학 수학식 3의 변수와 동일하며,

은 전술한 수학식 1의 변수와 동일하고,

와

는 전술한 수학식 6의 변수와 동일하고,

는 전술한 수학식 9의 변수와 동일하고,

는 서브 단말(SD1) 수신기가 받은 수신신호에 어떤 선형 수신 빔포밍 기술을 사용한 신호를 나타낸다.In the above equation (10),

Indicates the signal strength of the sub terminal SD2,

Wow

Is the same as the variable in tactical equation 3,

Is the same as the variable in Equation 1 above,

Wow

Is the same as the variable in Equation 6 above,

Is the same as the variable in Equation 9 above,

Denotes a signal using a linear reception beamforming technique in the received signal received by the sub terminal (SD1) receiver.

인 경우에는 직교 빔포밍을 포함한 수신 빔포밍을 하는 것이 이득이며, 그렇지 않은 경우에는 직교 빔포밍을 하지 않고 자유도를 유지하는 것이 수신기의 성능을 향상시킬 수 있다.if,

In this case, receiving beamforming including orthogonal beamforming is advantageous, and otherwise, maintaining the degree of freedom without orthogonal beamforming may improve the performance of the receiver.

That is, according to an embodiment of the present invention, in a situation where the main terminal exists, the sub terminal receives the signal of the main terminal, and optionally designs an orthogonal beamforming vector accordingly, thereby improving the performance of communication between the sub terminals. Can.

FIG. 3 is a graph showing an achievable rate when orthogonal beamforming is performed according to an embodiment of the present invention.

Referring to FIG. 3, it can be clearly seen that according to an embodiment of the present invention, an achievable rate can be increased when there is a main terminal having weak interference.

At this time, the difference may be wider depending on the signal strength of the main terminal, which explains that as the signal strength of the main terminal increases, the influence of the interference increases, and the benefit of selectively designing the reception beamforming design is generated. Can be.

At this time, the difference may be widened according to the signal strength of the sub terminal, which can be described as the influence of antenna freedom increases as the signal strength of the sub terminal increases, thereby generating a multiplexing gain.

Meanwhile, combinations of each block of the block diagram and each step of the flowchart may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that instructions executed through a processor of a computer or other programmable data processing equipment may be used in each block or flowchart of the block diagram. In each step, means are created to perform the functions described.

These computer program instructions can also be stored in a computer readable or computer readable memory or the like that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so the computer readable or computer readable memory The instructions stored in it are also possible to produce an article of manufacture containing instructions means for performing the functions described in each step of each block or flowchart of the block diagram.

In addition, since computer program instructions may be mounted on a computer or other programmable data processing equipment, a series of operation steps are performed on the computer or other programmable data processing equipment to generate a process executed by the computer to generate a computer or other program. It is also possible for instructions to perform possible data processing equipment to provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

Further, each block or each step may represent a module, segment, or portion of code that includes at least one executable instruction for executing the specified logical function(s). It should also be noted that in some alternative embodiments it is possible that the functions mentioned in blocks or steps occur out of order. For example, two blocks or steps shown in succession may in fact be executed substantially simultaneously, or it is also possible that the blocks or steps are sometimes performed in reverse order depending on the corresponding function.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may have various substitutions, modifications, changes, etc. without departing from the essential characteristics of the present invention. You will easily see this possible. That is, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to illustrate, and the scope of the technical spirit of the present invention is not limited by these embodiments.

Therefore, the protection scope of the present invention should be interpreted by the claims that will be described later, and all technical ideas within an equivalent range should be interpreted as being included in the scope of the present invention.

202: channel status information collection unit
204: orthogonal beamforming matrix calculator
206: antenna weight optimization unit

Claims (12)

A channel state information collection unit that receives a signal from a main terminal of MIMO-aware wireless communication and collects channel state information;
An orthogonal beamforming matrix calculator for calculating a covariance matrix of a main terminal channel and a sub-space of noise based on the signal strength included in the collected channel state information;
Based on the result of the calculation, after calculating the antenna weight orthogonal to the channel with the main terminal and includes an antenna weight optimization unit to apply to the receiver of the sub-terminal
A receiver performance control device for a sub terminal of a MIMO-aware wireless communication system. According to claim 1,
The channel status information,
Containing the covariance matrix of the channel
A receiver performance control device for a sub terminal of a MIMO-aware wireless communication system. According to claim 1,
The orthogonal beamforming matrix calculation unit,
The signal strength is determined according to a preset interference amount threshold of the communication system.
A receiver performance control device for a sub terminal of a MIMO-aware wireless communication system. According to claim 1,
The antenna weight optimization unit,
Calculating the antenna weight through eigenvalue decomposition of a covariance matrix of a channel with the main terminal
A receiver performance control device for a sub terminal of a MIMO-aware wireless communication system. The method of claim 4,
The antenna weight optimization unit,
Computing the eigenvalue decomposition by specifying the subspace of noise
A receiver performance control device for a sub terminal of a MIMO-aware wireless communication system. Collecting a channel state information by receiving a signal from a main terminal of MIMO-aware wireless communication;
Calculating a covariance matrix of a main terminal channel based on the signal strength included in the collected channel state information;
Based on the calculated covariance matrix, calculating an antenna weight orthogonal to a channel with the main terminal and applying it to the sub terminal.
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. The method of claim 6,
The channel status information,
Containing the covariance matrix of the channel
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. The method of claim 6,
The calculating step,
The signal strength is determined according to a preset interference amount threshold of the communication system.
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. The method of claim 8,
The calculating step,
Calculating the covariance matrix when the signal strength is greater than the preset interference threshold
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. The method of claim 6,
The applying step,
Calculating the antenna weight through eigenvalue decomposition of a covariance matrix of a channel with the main terminal
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. The method of claim 10,
The eigenvalue decomposition is
Calculated by specifying the subspace of noise
A method for controlling performance of a receiver in a sub terminal of a MIMO-aware wireless communication system. A computer-readable recording medium storing a computer program that allows a processor to perform a method for controlling a receiver performance of a sub terminal of a MIMO-aware wireless communication system,
The receiver performance control method,
Collecting a channel state information by receiving a signal from a main terminal of MIMO-aware wireless communication;
Calculating a covariance matrix of a main terminal channel based on the signal strength included in the collected channel state information;
Based on the calculated covariance matrix, calculating an antenna weight orthogonal to a channel with the main terminal and applying it to the sub terminal.
Computer-readable recording media.

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