KR101748814B1 - Apparatus and method for signal trransmitting and receiviing with hibrid beamforming - Google Patents

Abstract

The present invention includes radio frequency combiners and baseband combiners. At this time, the radio frequency combiner receives a signal from a plurality of transmitters, and transmits a signal received from a predetermined transmitter among the received signals based on an effective channel to a baseband combiner. And the effective channel is set so as to maximize a data rate for a signal received from a predetermined transmitter, and the received signal includes a signal transmitted from a predetermined transmitter and a signal transmitted from a different transmitter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transmitter, a receiver, and a signal transmission / reception method for hybrid beamforming,

The present invention relates to a transmitter, a receiver, and a signal transmission / reception method for hybrid beamforming.

Background of the Invention [0002] Recently, wireless communication systems are being developed to support higher data rates in order to meet the ever-increasing demands of wireless data traffic. For example, a wireless communication system may use a communication technology such as orthogonal frequency division multiple access (OFDMA) and multiple input multiple output (MIMO) technology development is under way to improve the spectral efficiency.

BACKGROUND OF THE INVENTION [0002] Wireless communication systems are considering communication in a millimeter wave band to accommodate increasing transmission rates. However, wireless communication systems can suffer from performance degradation due to severe propagation attenuation in the millimeter waveband.

In order to maximize the efficiency of the wireless resources, the wireless communication system can simultaneously transmit signals to desired receivers by using the same radio resources such as time, frequency, and code. However, because the transmitter can send signals to the desired receiver at the same time, the receiver in the wireless communication system may receive unwanted interfering signals, which may degrade overall network performance.

Wireless communication systems can solve this problem and utilize a hybrid beam-forming structure to achieve high data throughput while overcoming performance degradation. The hybrid beam-forming structure combines an analog beam-forming structure and a digital beam-forming structure. The hybrid beamforming structure can efficiently utilize resources, reduce signal-to-noise ratio (SNR), and improve reliability.

However, the hybrid beamforming structure under study only considers the case where only one transmitter and receiver exist, and the research on interference channel is insufficient.

In this regard, Korean Patent Laid-Open Publication No. 10-2013-0127376 (entitled "Communication Method and Apparatus via Analog and Digital Hybrid Beam Forming") discloses a method and apparatus for communication through analog and digital hybrid beamforming . The present invention overcomes a large propagation loss in a very high frequency band and maximizes a system efficiency / diversity performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hybrid beamforming receiver capable of selecting an effective channel and minimizing interference of other transmitters, a signal receiving method of a hybrid beamforming receiver, a hybrid beamforming transmitter, A signal transmission method of a hybrid beam forming transmitter is provided.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a receiver for hybrid beamforming comprising a radio frequency combiner and a baseband combiner. At this time, the radio frequency combiner receives a signal from a plurality of transmitters, and transmits a signal received from a predetermined transmitter among the received signals based on an effective channel to a baseband combiner. And the effective channel is set so as to maximize a data rate for a signal received from a predetermined transmitter, and the received signal includes a signal transmitted from a predetermined transmitter and a signal transmitted from a different transmitter.

Also, a transmitter for hybrid beamforming according to the second aspect of the present invention includes a baseband precoder and a radio frequency precoder. At this time, the radio frequency precoder receives the signal from the baseband precoder and delivers the received signal to the predetermined receiver based on the effective channel. The effective channel is set so that the transmission rate for the signal transmitted to the predetermined receiver is maximized.

And transmitting the signal received from the predetermined transmitter among the signals received by the combiner according to the third aspect of the present invention to the baseband combiner based on the effective channel. At this time, the effective channel is set so as to maximize the data rate for the signal received from the predetermined transmitter, and the received signal includes the signal transmitted from the predetermined transmitter and the signal transmitted from the different transmitter.

A method of transmitting a signal of a hybrid beamforming transmitter according to a fourth aspect of the present invention includes the steps of: a radio frequency precoder receiving a signal from a baseband precoder; And the radio frequency precoder transmitting the received signal based on the effective channel to a predetermined receiver. At this time, the effective channel is set so as to maximize a transmission rate for a signal transmitted to a predetermined receiver.

The present invention minimizes the impact of interference on other transmitters at high signal-to-interference noise ratios, thereby reducing performance attenuation. Therefore, the present invention can provide an efficient signal transmission and reception method.

1 is a block diagram of a hybrid beamforming transmitter and receiver in accordance with an embodiment of the present invention.
2 is a pseudo code of an orthogonal matching follow-up algorithm according to an embodiment of the present invention.
3 is a block diagram of a hybrid beamforming receiver in accordance with an embodiment of the present invention.
4 is a block diagram of a hybrid beamforming transmitter in accordance with an embodiment of the present invention.
5 is a flowchart illustrating a signal reception method of a hybrid beamforming receiver according to an embodiment of the present invention.
6 is a flowchart illustrating a signal transmission method of a hybrid beamforming transmitter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

The following will describe a transmitter and a receiver for hybrid beamforming according to an embodiment of the present invention with reference to FIG.

1 is a block diagram of a hybrid beamforming network in accordance with an embodiment of the present invention.

A plurality of transmitters 100, 110, and 120 and a plurality of receivers 130, 140, and 150 included in the hybrid beamforming network have a hybrid beamforming structure, respectively. In addition, the plurality of transmitters 100, 110, and 120 and the plurality of receivers 130, 140, and 150 may exist in pairs, respectively. Here, the connection relationships and the order of the plurality of transmitters 100, 110, and 120 and the plurality of receivers 130, 140, and 150 in FIG. 1 are illustrative but are not limited thereto.

In addition, the transmitters 100, 110, and 120 and the receivers 130, 140, and 150 may each include a plurality of repeaters. For example, the transmitters 100, 110, and 120 may exchange signals with a plurality of repeaters included in the receivers 130, 140, Alternatively, the receiver 130, 140, 150 may exchange signals with a plurality of repeaters included in the transmitters 100, 110,

The transmitter 100, 110, or 120 according to an exemplary embodiment of the present invention includes a plurality of antennas. Transmitters 100, 110 and 120 transmit a plurality of data streams to receivers 130, 140 and 150 through a plurality of antennas. In this case, the receiver 130, 140, 150 receiving the data stream transmitted by the transmitter 100, 110, 120 may be a predetermined receiver for receiving the data stream of the transmitter 100, 110, 120.

The receiver 130, 140, 150 includes a plurality of antennas similar to the transmitters 100, 110, 120. Receivers 130, 140 and 150 receive signals from a plurality of transmitters 100, 110 and 120 through a plurality of antennas. At this time, the receivers 130, 140 and 150 may be transmitters predetermined to receive a data stream among a plurality of transmitters 100, 110 and 120 transmitting signals.

Also, the transmitters 100, 110, 120 and the receivers 130, 140, 150 may include a plurality of radio frequency chains to support multiple data streams.

Referring to FIG. 1, the first transmitter 100 includes a first transmitter 100, a second transmitter 100, a second transmitter 120, Lt; RTI ID = 0.0 > 130 < / RTI > The signals transmitted by the first transmitter 100 may be transmitted to the first receiver 130 and the second receiver 140 through the hybrid beamforming network such as the first receiver 130 and the second receiver 140 and the third receiver 150, And may be transmitted to a plurality of receivers. That is, the signal of the first transmitter 100 transmitted to the receiver 140, 150 other than the predetermined first receiver 130 may act as an interference signal.

Also, the first receiver 130, which is predetermined to receive a signal from the first transmitter 100, may receive the signal of the first transmitter 100. [ At this time, the first receiver 130 receives signals from the plurality of transmitters included in the transmission range on the hybrid beamforming network, such as the second transmitter 110 and the third transmitter 120, together with the signals of the first transmitter 100 Lt; / RTI > At this time, signals of other transmitters other than the predetermined signals of the first transmitter 100 may be interference signals.

및

개의 라디오 주파수 체인을 포함하고 있다.Specifically, the first transmitter 100 includes N _t antennas and transmits N _s data streams to the first receiver 130. The first receiver 130 includes N _r antennas and may receive a data stream from the first transmitter 100. Also, the first transmitter 100 and the first receiver 130 may each be configured to support multiple data streams,

And

Of radio frequency chains.

The first receiver 130 may receive interfering signals from other transmitters, such as the second transmitter 110 and the third transmitter 120, along with the data stream of the first transmitter 100.

Therefore, the first transmitter 100 and the first receiver 130 need to appropriately control interference from other transmitters such as the second transmitter 110 and the third transmitter 120.

In order to control interference, the precoder (F _i) of the transmitter base band (base band; BB) precoder (precoder) and radio frequency (radio frequency; RF) based on a multiplication of the precoder Equation 1 and Can be calculated together. In Equation (1), F _{i and BB} are baseband precoders, and F _{i and RF} are radio frequency precoders.

Therefore, the signal transmitted by the transmitter is expressed by Equation (2). In Equation (2), s _i is a data symbol vector transmitted by the i th transmitter.

를 만족할 수 있다. 그러므로 송신기로부터 신호를 수신하기로 결정된 수신기가 수신하는 신호는 [수학식 3]와 같이 송신기로부터 수신하는 신호와 송신기를 제외한 다른 송신기로부터 수신하는 신호의 합으로 표현될 수 있다. [수학식 3]에서 H _ij 는 j번째 송신기와 i번째 수신기 사이의 채널 행렬이며, n _i 는 i번째 수신기에서 발생할 수 있는 잡음이다.When the transmission power of each transmitter is P , the transmission power P of the transmitter is

Can be satisfied. Therefore, the signal received by the receiver determined to receive the signal from the transmitter can be expressed by the sum of the signal received from the transmitter and the signal received from another transmitter except for the transmitter, as shown in Equation (3). In Equation (3), H _ij is the channel matrix between the j th transmitter and the i th receiver, and n _i is the noise that can be generated in the i th receiver.

The receiver may also include a baseband combiner and a radio frequency combiner. Baseband compartment and by you W _{i, BB,} radio frequency combiners you W _{i, RF} when, receives the receiver's combiner signal having passed through the W _i = W _{i, RF} W _{i, BB} is Equation 4] and same.

의 형태를 취하게 된다.At this time, the baseband precoder and baseband combiner included in the transmitter can simultaneously adjust amplitude and phase. However, the radio frequency precoder and radio frequency combiner included in the receiver can be phase-shifted, but the magnitude of the amplitude can not be changed. Therefore, the values of each matrix

.

Transmitters and receivers consider a hybrid beamforming system to transmit and receive in the millimeter waveband. Therefore, the channel in the millimeter waveband is expressed by Equation (5).

는 j번째 송신기 및 i번째 수신기에 대한 m번째 경로의 복소수 이득(gain)을 나타낸다.

와

는 각각 m번째 경로의 도래각과 발사각을 나타낸다. 그러므로

와

는 각각 j번째 송신기와 i번째 수신기에서 안테나 어레이 응답 벡터를 나타난다. 즉, 균일한 선형 배열(uniform linear array) 안테나일 경우,

와

는 각각 다음 [수학식 6] 및 [수학식 7]과 같이 나타낼 수 있다.In Equation (5)

Represents the complex gain of the m- th path for the j- th transmitter and the i- th receiver.

Wow

Represents the arrival angle and the launch angle of the m- th path, respectively. therefore

Wow

Represents the antenna array response vector at the j- th transmitter and the i- th receiver, respectively. That is, in the case of a uniform linear array antenna,

Wow

Can be expressed by the following equations (6) and (7), respectively.

는 파장의 길이이며 d는 안테나 사이의 거리를 나타낸다. 그러므로 [수학식 5]와 같은 채널 모델은 [수학식 8]과 같은 형태로 다시 표현될 수 있다.In equations (6) and (7)

Is the length of the wavelength and d is the distance between the antennas. Therefore, a channel model such as Equation (5) can be rewritten as Equation (8).

을 만족할 수 있다. [수학식 8]에서

와

는 각각 j번째 송신기의 송신 어레이 응답 벡터와 i번째 수신기의 수신 어레이 응답 벡터가 될 수 있다. 예를 들어, 송신 어레이 응답 벡터와 수신 어레이 응답 벡터는 각각 다음 [수학식 9] 및 [수학식 10]와 같이 나타낼 수 있다.At this time, Equation (8)

Can be satisfied. In Equation 8,

Wow

May be the transmit array response vector of the jth transmitter and the receive array response vector of the i < th > receiver, respectively. For example, the transmit array response vector and the receive array response vector may be expressed by the following equations (9) and (10), respectively.

와

의 곱인

로 표현할 수 있다. 이때, 각 배열의 크기는

가 될 수 있다. 또한, 수신기의 베이스밴드 컴바이너는 2개의 배열

와

의 곱인

로 표현할 수 있다. 그러므로 [수학식 4]의 수신기에서 수신하는 신호는 [수학식 11]과 같이 다시 표현될 수 있다.Meanwhile, the baseband precoder of the transmitter and the baseband combiner of the receiver according to an embodiment of the present invention can be decomposed into two arrays, respectively. For example, the transmitter's baseband precoder has two arrays

Wow

Of the

. At this time, the size of each array is

. The receiver baseband combiner also has two arrays

Wow

Of the

. Therefore, the signal received by the receiver of Equation (4) can be expressed again as Equation (11).

이다. 또한, i번째 수신기와 j번째 송신기 사이의 유효 채널은

와 같이 표현될 수 있다. 그러므로 송신기 및 수신기에서 신호 송수신에 대한 성능은 유효 채널 및 타 송신기로부터 수신한 간섭 신호에 의해 결정될 수 있다. 예를 들어, 송신기 및 수신기는 간섭 정렬을 만족시킬 수 있는 최소한의 정수로 배열의 크기

와

를 정할 수 있다.In Equation (11), the interference signal received from another transmitter other than the predetermined jth transmitter is

to be. Also, the effective channel between the i < th > receiver and the j <

Can be expressed as Therefore, the performance for transmitting and receiving signals at the transmitter and the receiver can be determined by the interference signals received from the effective channel and other transmitters. For example, the transmitter and the receiver may use the minimum integer that can satisfy the interference alignment,

Wow

.

와

를 산출할 수 있다.Therefore, in order to maximize the data rate of the effective channel, the transmitter and the receiver use F _{i, RF} , W _{i, RF} ,

Wow

Can be calculated.

와

를 최소화시키는 것과 유사할 수 있다.In Equation (12), F is a set of radio frequency precoders and W is a set of radio frequency combiners. At this time, maximizing the objective function of Equation (12)

Wow

≪ / RTI >

로 특이값 분해될 때, F _i,opt 와 W _i,opt 는 각각 V _ii 와 U _ii 의 열벡터 중 최대의 기저 값에 해당하는

와

개의 열벡터로 이루어진 행렬이 될 수 있다. 그러므로

와

는 각각 독립적인 문제이다. Thus, singular value decomposition (SVD) can be performed on H _ii . H _ii

, F _{i, opt} and W _{i, opt} are respectively denoted by V _ii and Corresponding to the largest base value of the column vectors of U _ii

Wow

Lt; RTI ID = 0.0 > column vectors. ≪ / RTI > therefore

Wow

Are independent of each other.

의 값을 최소화하도록 F _{i ,RF}와

결정할 수 있다. 또한, 수신기는

의 값을 최소화하도록 W _{i ,RF}와

를 결정할 수 있다. 그리고 최적에 근접한 하이브리드 프리코더는 F 를

형태의 제한함으로써 구할 수 있다.Therefore,

To minimize the value of F _{i , RF} and

You can decide. Also,

To minimize the value of W _{i , RF} and

Can be determined. And the hybrid precoder nearest to the optimal F

Can be obtained by limiting the form.

를 도출하기 위하여 직교 매칭 추종(orthogonal matching pursuit; OMP) 알고리즘을 사용할 수 있다. 예를 들어, 직교 매칭 추종 알고리즘은 도 2의 의사 코드(pseudo-code)와 같다. F _{i , RF} satisfying the formula (13)

An orthogonal matching pursuit (OMP) algorithm may be used to derive the output signal. For example, the orthogonal matching tracking algorithm is the same as the pseudo-code of FIG.

2 is a pseudo code of an orthogonal matching follow-up algorithm according to an embodiment of the present invention.

와

를 설계할 수 있다. On the other hand, the transmitter and the receiver can minimize the influence of interference based on the interference alignment technique. For example, transmitters and receivers may be used to minimize interference effects

Wow

Can be designed.

를

가 구성하는 부분공간의 직교 여공간이라고 하였을 때, i번째 수신기에서

의 공간 밖으로 누출되는 j번째 송신기에서 보낸 간섭 신호의 양인 간섭 추출은 다음 [수학식 14]와 같이, 표현될 수 있으며, 간섭을 최소화하기 위한 식은 [수학식 15]와 같이 표현될 수 있다.At this time,

To

When the hayeoteul called orthogonal complement subspace of constituting, at the i-th receiver

Which is the amount of the interference signal transmitted from the j- th transmitter leaking out of the space of the space, can be expressed by the following Equation (14), and the equation for minimizing the interference can be expressed as Equation (15).

및

는 반복적인 방법에 의해서 구해질 수 있다. 예를 들어, 먼저

를 고정하고, 최적화된

값을 찾을 수 있다. 다음으로 최적화된

값을 찾은 후, 최적화된

값을 기준으로 최적화된

을 찾을 수 있다. 다시 최적화된

값을 찾은 후, 최적화된

값을 기준으로 최적화된

을 찾을 수 있다. 미리 정해진 조건을 만족할 때까지 이러한 과정을 반복하여 최적화된

와

를 구할 수 있다.At this time, the optimized

And

Can be obtained by an iterative method. For example,

Lt; RTI ID = 0.0 >

The value can be found. Next optimized

After finding the value,

Optimized by value

Can be found. Re-optimized

After finding the value,

Optimized by value

Can be found. This process is repeated until a predetermined condition is satisfied,

Wow

Can be obtained.

가 고정되어 있을 때 다음 [수학식 15]를 만족하는 최적화된

는 다음 [수학식 16]과 같이 구해질 수 있다.More specifically,

Is fixed, the following equation (15) is satisfied: < RTI ID = 0.0 >

Can be obtained by the following equation (16).

는 행렬 A의 가장 영향력이 적은 d개의 기저 벡터(base vector)들로 이루어진 행렬을 의미한다. 다음으로

가 고정되어 있을 때 최적화된

를 구하는 식은 [수학식 17]과 같다. 그러므로 송신기 및 수신기는 [수학식 16] 및 [수학식 17]을 미리 정해진 조건에 만족할 때까지 반복 산출하여, 간섭을 최소화할 수 있다. here is

Denotes a matrix composed of d base vectors having the least influence of matrix A. to the next

Optimized when fixed

Is expressed by Equation (17). Therefore, the transmitter and the receiver can repeatedly calculate [Expression 16] and [Expression 17] until the predetermined condition is satisfied, thereby minimizing the interference.

로 정규화될 수 있다.If all optimized precoders and optimized combiners are calculated through the equations (16) and (17) to minimize the interference, the transmit power of the transmitter

≪ / RTI >

The following describes a hybrid beamforming receiver according to an embodiment of the present invention, with reference to FIG.

3 is a block diagram of a hybrid beamforming receiver 300 in accordance with an embodiment of the present invention.

The hybrid beamforming receiver 300 includes a radio frequency component 310, a plurality of radio frequency chains 320, a baseband combiner 330, and a plurality of antennas 340.

A plurality of antennas 340 receive signals from a plurality of transmitters and transmit them to a radio frequency combiner 310. [ At this time, the signals received by the plurality of antennas 340 may be analog signals.

The radio frequency combiner 310 transmits the signals received from the plurality of transmitters through the plurality of antennas 340 to the baseband combiner 330 through the radio frequency chain 320. At this time, the radio frequency combiner 310 may be an analog combiner. The baseband combiner 330 may also be a digital combiner.

Specifically, radio frequency combiner 310 receives signals from a plurality of transmitters 400. At this time, the radio frequency combiner 310 can select a signal received from the predetermined transmitter 400 among the plurality of received signals. The radio frequency combiner 310 then transmits the selected signal to the baseband combiner 330.

At this time, the signal received by the radio frequency combiner 310 may include an interference signal transmitted from a predetermined transmitter 400 and another transmitter different from the predetermined transmitter 400. That is, the radio frequency combiner 310 can transmit a signal received from the predetermined transmitter 400 among the signals for the plurality of transmitters to the baseband combiner 330.

Therefore, the radio frequency combiner 310 must minimize interference signals received from other transmitters. That is, the predetermined transmitter 400 must transmit a signal such that the amount of interference signal received by the radio frequency combiner 310 from the other transmitter is minimized.

For example, the predetermined transmitter 400 may transmit the established signal to the radio frequency combiner 310 according to the effective channel based on the interference alignment technique. At this time, the effective channel is set so as to maximize the transmission rate of the signal received from the predetermined transmitter 400. [

The signal and the effective channel transmitted by the predetermined transmitter 400 can be set based on the interference alignment technique and the orthogonal matching follow-up algorithm as described above with reference to Figs. 1 and 2 above. The effective channel can be selected based on the orthogonal matching follow-up algorithm as shown in Fig. 2 described above.

4, a hybrid beamforming transmitter 400 according to an embodiment of the present invention is described.

4 is a block diagram of a hybrid beamforming transmitter 400 in accordance with an embodiment of the present invention.

The hybrid beamforming transmitter 400 includes a baseband precoder 410, a plurality of radio frequency chains 420, a radio frequency precoder 430, and a plurality of antennas 440.

The baseband precoder 410 transmits the signal to be transmitted to the predetermined receiver 300 to the radio frequency precoder 430 through the radio frequency chain 420. At this time, the baseband precoder 410 may be a digital precoder.

In addition, the radio frequency precoder 430 transmits a signal to be transmitted to the predetermined receiver 300 through the plurality of antennas 440. At this time, the radio frequency precoder 430 may be an analog precoder.

Specifically, radio frequency precoder 430 receives a signal from baseband precoder 410. The radio frequency precoder 430 then transmits the received signal to the predetermined receiver 300 based on the effective channel.

At this time, the effective channel is set so that the transmission rate for the signal transmitted to the predetermined receiver 300 is maximized. For example, the effective channel may be set through an orthogonal matching follow-up algorithm, as described above with reference to Figures 1 and 2 above.

In addition, the radio frequency precoder 430 can transmit a signal to the predetermined receiver 300 so that the interference signal amount of the other transmitter 400 received by the predetermined receiver 300 is minimized. For example, the radio frequency precoder 430 may set the signal to transmit based on the interference alignment technique, as described with reference to Figs.

Next, with reference to FIG. 5, a signal receiving method of the hybrid beamforming receiver 300 will be described.

5 is a flowchart of a signal reception method of the hybrid beamforming receiver 300 according to an embodiment of the present invention.

A radio frequency combiner 310 included in the hybrid beamforming receiver 300 receives a signal from a plurality of transmitters 400 (S500).

The plurality of transmitters 400 may include a transmitter 400 predetermined to receive signals from the hybrid beamforming receiver 300 and another transmitter 400 other than the predetermined transmitter 400. That is, the signal received by the hybrid beamforming receiver 300 may include a signal received from the predetermined transmitter 400 and an interference signal received from another transmitter 400 other than the predetermined transmitter 400.

The radio frequency combiner 310 included in the hybrid beamforming receiver 300 transmits the signal received from the predetermined transmitter 400 to the baseband combiner based on the effective channel of the received signal S510). At this time, the effective channel is set so as to maximize the transmission rate of the signal received from the predetermined transmitter 400. [

Next, with reference to FIG. 6, a signal transmission method of the hybrid beamforming transmitter 400 will be described.

6 is a flowchart of a signal transmission method of the hybrid beamforming transmitter 400 according to an embodiment of the present invention.

The radio frequency precoder 430 included in the hybrid beamforming transmitter 400 receives the signal to be transmitted from the baseband precoder 410 to the predetermined receiver 300 (S600).

In addition, the radio frequency precoder 430 included in the hybrid beamforming transmitter 400 transmits the received signal to the predetermined receiver 300 based on the effective channel (S610). At this time, the effective channel may be set such that the transmission rate of the signal transmitted to the predetermined receiver 300 by the hybrid beamforming transmitter 400 is maximized.

A transmitter 400, a receiver 300, and a signal transmission / reception method for hybrid beamforming according to an exemplary embodiment of the present invention minimizes the influence of an interference signal to other transmitters in a high signal-to-interference noise ratio, . Therefore, the transmitter 400, the receiver 300, and the signal transmission / reception method for hybrid beamforming can provide an efficient signal transmission / reception method.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

300: Hybrid beamforming receiver
310: Radio frequency combiner
320: Radio frequency chain
330: Baseband combiner
340: antenna
400: Hybrid beam forming transmitter
410: Baseband precoder
420: Radio frequency chain
430: Radio frequency precoder
440: Antenna

Claims (11)

A receiver for hybrid beamforming,
Radio Frequency Combiner and
Baseband combiner,
The radio frequency combiner receiving a signal from a plurality of transmitters and transmitting a signal received from a predetermined one of the received signals to the baseband combiner based on an effective channel,
Wherein the effective channel is set to maximize a data rate for a signal received from the predetermined transmitter,
Wherein the received signal is transmitted by the plurality of transmitters based on the normalized transmit power and includes a signal transmitted from the predetermined transmitter and a signal transmitted from another transmitter except for the predetermined transmitter among the plurality of transmitters ,
Wherein the normalized transmission power is set based on a value of a baseband precoder of the other transmitter and a value of the baseband combiner such that an interference signal amount of the other transmitter is minimized,
The value of the baseband precoder of the other transmitter and the value of the baseband combiner,
Calculating an optimized baseband combiner value in a state in which the value of the baseband precoder of the other transmitter is fixed and calculating a value of the optimized baseband precoder based on the calculated baseband combiner value The calculation process is repeatedly performed,
Calculates the optimized baseband precoder value while fixing the value of the baseband combiner of the other transmitter, and calculates the optimized baseband combiner value based on the calculated baseband precoder value And calculating a repetition rate of the received signal. The method according to claim 1,
Wherein the effective channel is set through an orthogonal matching pursuit algorithm. The method according to claim 1,
Wherein the signal received from the predetermined transmitter is each set to the radio frequency combiner and the predetermined transmitter such that the amount of the interference signal is minimized. The method of claim 3,
Wherein the signal received from the predetermined transmitter is set based on an interference alignment technique. A transmitter for hybrid beamforming,
Baseband precoder and
A radio frequency precoder,
The radio frequency precoder receiving a signal from the baseband precoder and delivering the received signal to a predetermined receiver based on the effective channel and the normalized transmit power,
Wherein the effective channel is set such that a transmission rate for a signal transmitted to the predetermined receiver is maximized,
Wherein the normalized transmit power is determined based on a value of a baseband precoder of the other transmitter and a value of a baseband combiner of the predetermined receiver such that an amount of interference of another transmitter that transmits a signal to the predetermined receiver is minimized Is set,
The value of the baseband precoder of the other transmitter and the value of the baseband combiner,
Calculating an optimized baseband combiner value in a state in which the value of the baseband precoder of the other transmitter is fixed and calculating a value of the optimized baseband precoder based on the calculated baseband combiner value The calculation process is repeatedly performed,
Calculates the optimized baseband precoder value while fixing the value of the baseband combiner of the other transmitter, and calculates the optimized baseband combiner value based on the calculated baseband precoder value And calculating a repetition rate of the received signal. 6. The method of claim 5,
Wherein the effective channel is set through an orthogonal matching pursuit algorithm. 6. The method of claim 5,
Wherein the signal delivered to the predetermined receiver is each set to the radio frequency precoder and the predetermined receiver such that the amount of the interference signal is minimized. 8. The method of claim 7,
Wherein the signal to be transmitted to the predetermined receiver is set based on an interference alignment technique. A method for receiving a signal in a hybrid beamforming receiver,
The radio frequency combiner receiving a signal from a plurality of transmitters; And
The radio frequency combiner transmitting a signal received from a predetermined transmitter among the received signals to a baseband combiner based on an effective channel,
Wherein the effective channel is set to maximize a data rate for a signal received from the predetermined transmitter,
Wherein the received signal is transmitted by the plurality of transmitters based on the normalized transmit power and includes a signal transmitted from the predetermined transmitter and a signal transmitted from another transmitter except for the predetermined transmitter among the plurality of transmitters ,
Wherein the normalized transmission power is set based on a value of a baseband precoder of the other transmitter and a value of the baseband combiner such that an interference signal amount of the other transmitter is minimized,
The value of the baseband precoder of the other transmitter and the value of the baseband combiner,
Calculating an optimized baseband combiner value in a state in which the value of the baseband precoder of the other transmitter is fixed and calculating a value of the baseband precoder optimized based on the calculated baseband combiner value The calculation process is repeatedly performed,
Calculates the optimized baseband precoder value while fixing the value of the baseband combiner of the other transmitter, and calculates the optimized baseband combiner value based on the calculated baseband precoder value Wherein the signal is received by the receiver. A signal transmission method of a hybrid beamforming transmitter,
The radio frequency precoder receiving a signal from a baseband precoder; And
The radio frequency precoder transmitting the received signal to a predetermined receiver based on an effective channel and a normalized transmit power,
Wherein the effective channel is set such that a transmission rate for a signal transmitted to the predetermined receiver is maximized,
Wherein the normalized transmit power is determined based on a value of a baseband precoder of the other transmitter and a value of a baseband combiner of the predetermined receiver such that an amount of interference of another transmitter that transmits a signal to the predetermined receiver is minimized Is set,
The value of the baseband precoder of the other transmitter and the value of the baseband combiner,
Calculating an optimized baseband combiner value in a state in which the value of the baseband precoder of the other transmitter is fixed and calculating a value of the optimized baseband precoder based on the calculated baseband combiner value The calculation process is repeatedly performed,
Calculates the optimized baseband precoder value while fixing the value of the baseband combiner of the other transmitter, and calculates the optimized baseband combiner value based on the calculated baseband precoder value And repeating the process. A computer-readable recording medium recording a program for performing the method according to any one of claims 9 to 10 on a computer.

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