KR100292040B1 - Beam selection methods of multi-beam array antenna and transceivers using them - Google Patents

Abstract

PURPOSE: A method for selecting a beam of a multi beam array antenna and a transceiving apparatus using the same are provided to enable a proper application to be made according to a time varying signal environment, such as a mobile communication. CONSTITUTION: A received signal vector(x) of an array antenna is formed by applying a low band frequency shift and demodulation to a signal received from each antenna element. The received signal vector and predetermined gain vectors(w1,w2,...wN) are subject to an Euclidean inner product whereby output received signals(y1,y2,...yN) of the array antenna are generated. Signals received from all terminals within a cover range are processed with a signal discriminator which is designed according to a pertinent signal environment, thereby separating and extracting respective terminal signals. The largest signal is selected from a plurality of received signals with respect to respective terminals. The gain vector value is set so that a signal phase of a reference antenna element cannot be changed.

Description

Beam selection method of multi-beam array antenna and transmitting / receiving apparatus using same {BEAM SELECTION METHODS OF MULTI-BEAM ARRAY ANTENNA AND TRANSCEIVERS USING THEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique using an array antenna, and more particularly, to a beam selection method of a multi-beam array antenna for covering a sector by dividing a plurality of narrow beams and a transceiver using the same.

In the conventional case, as shown in FIG. 1A, since a mobile communication base station or the like uses a base station system that covers the entire sector with the same gain value with a single beam, it is possible to apply to other terminal signals in the same sector. There was a problem that the signals of all the terminals are mutually interfered by.

In addition, as shown in FIG. 1B, a method of significantly reducing mutual interference between terminals by providing a predetermined range of sectors covered by a plurality of narrow angle beams has been proposed, but selecting a narrow angle beam for each terminal simply and accurately Since a proper method for properly switching the communication channel is not presented so that the communication method and the communication method are not disconnected, there are many problems in the actual implementation of the narrow-beam antenna system as shown in FIG.

For example, as shown in FIG. 1B, the mobile terminal is initially in the cover range of the narrow angle beam # 1, and then moves to the beam # 2 → beam # 1 → beam # 2 → beam # 3 cover range. While performing communication with the narrow angle beam 1 #, it is necessary to switch accurately to the appropriate narrow angle beam area according to the change of the position of the terminal, thereby achieving smooth communication with the effect of interference attenuation using the above-mentioned multiple narrow angle beams. However, in the related art, according to the movement of the mobile terminal, a technique for accurately switching to the corresponding narrow beam cover range has not been proposed, and thus it is impossible to fully enjoy the effect of using the multiple narrow beam base station as described above.

Recently, there has been a rapid increase in demand for various wireless communications, such as mobile communications. Since the limitations of the prior art as described above cannot meet such a rapid increase in demand, new communication quality in wireless communications systems And there is an urgent need for ways to increase communication capacity.

The present invention has been made to solve the problems of the prior art as described above and to meet the demands of the times, and adopts an array antenna structure, but in the conventional case, one wide sector range covered by a single antenna element Subdivided into a plurality of array antenna elements to be shared by the narrow beam, and in the base station in communication with each terminal, switching the correct narrow beam for each terminal fast enough to correspond to the moving speed of each terminal In order to accurately determine which beam corresponds to each terminal, an object of the present invention is to provide a beam selection method of a multi-beam array antenna suitable for application to a time-converted signal environment such as mobile communication, and a transmission / reception apparatus using the same.

1A is a conceptual diagram illustrating a conventional case of covering an entire sector with a single beam;

1B is a conceptual diagram illustrating a case in which a sector is divided into several narrow beams and covered according to the present invention;

2 is a configuration diagram of a first embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention;

3A is an exemplary configuration diagram of a signal discriminator considering the CDMA signal environment used in the reception apparatuses of the first to third embodiments;

3B is an explanatory diagram of a signal discriminator in consideration of the TDMA signal environment used for the reception apparatuses of the first to third embodiments;

3C is an exemplary configuration diagram of a signal discriminator considering the FDMA signal environment used in the reception apparatuses of the first to third embodiments;

4 is an exemplary configuration diagram of a maximum size selector used in the receiving apparatus of the first to third embodiments;

FIG. 5 is a diagram illustrating a case where the CDMA signal discriminator of FIG. 3A is applied to the receiver of the first embodiment of FIG. 2; FIG.

6 is a configuration diagram of a second embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention;

7 is a configuration diagram of a third embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention;

8 is a configuration diagram of a first embodiment of a transmission apparatus using a multibeam array antenna according to the present invention;

9 is a block diagram of a second embodiment of a transmission apparatus using a multi-beam array antenna according to the present invention.

* Explanation of symbols for main parts of the drawings

1, 85, 97: antenna element 2: receiver

3, 82: multiplier 4, 83, 94: adder

5: Signal discriminator 6: Maximum size selector

7: low noise amplification and intermediate frequency

8, 93: phase delay element (PS) 81, 92: demultiplexer

84, 91: transmitter 95: frequency high pass

96: amplifier

)를 형성하는 단계; 상기 수신 신호벡터(

)를 공지의 빔형성 방법으로 결정된 소정의 이득벡터들(w₁, w₂, . . . . . . w_N)로 처리(

와의 Euclidean inner product, 즉, y_i=

)하여 각각의 협각빔으로 수신한 배열 안테나의 출력 수신신호(y₁, y₂, . . . . . . , y_N)를 생성하는 단계; 해당 신호환경에 따라 설계된 신호분별기로 커버범위 내의 모든 단말로 부터 수신된 신호를 처리하여 각각의 단말 신호를 분리 추출하는 단계; 및 수신 안테나 배열에서 각 단말에 대한 수신신호의 다수(N, 단 N은 2 이상의 자연수임) 개의 후보 중에서 크기가 가장 큰 것을 선택하는 단계를 포함하는 다중빔 배열 안테나의 빔 선택방법을 제공한다.In order to achieve the above object, the present invention provides a method for beam selection of a multi-beam array antenna, wherein the received signal vector of the array antenna is subjected to low frequency shift and demodulation of a signal received at each antenna element.

Forming); The received signal vector (

) Is processed into predetermined gain vectors w ₁ , w ₂ ,... W _N determined by a known beamforming method.

Euclidean inner product with y _i =

Generating an output reception signal y ₁ , y ₂ ,..., Y _N of the array antenna received with each narrow beam; Separating and extracting each terminal signal by processing signals received from all terminals within a cover range with a signal separator designed according to a corresponding signal environment; And selecting the largest one among a plurality of candidates (N, where N is a natural number of two or more) of the received signals for each terminal in the reception antenna array.

In addition, a receiving apparatus using a multi-beam array antenna, comprising: a plurality of antenna elements; Signal receiving means for receiving a signal received by the plurality of antenna elements and frequency low-pass transition and demodulation; A plurality of multiplying means for multiplying a plurality of complex gain vectors whose values are predetermined such that the plurality of antenna elements share and divide the entire cover range; A plurality of addition means for adding an output of the multiplication means to provide a received output signal (y); A plurality of signal discriminating means for extracting a signal of each terminal from the respective received output signals; And a maximum size selection means for selecting and outputting at least one signal among a plurality of candidates (M, where M is a natural number of two or more) of the received signals for each terminal by comparing the intensity of the outputs of the signal discrimination means. Provided is a receiving apparatus using a multibeam array antenna.

In addition, a receiving apparatus using a multi-beam array antenna, comprising: a plurality of antenna elements; A plurality of phase delay means for applying a plurality of phase delay vectors whose values are predetermined by a known signal processing technique so that the plurality of antenna elements share the entire coverage range; A plurality of adding means for adding an output of said phase delay means to provide a received output signal y; A plurality of receiving means for receiving the output signal of the adding means for frequency low-pass transition and demodulation; Signal discriminating means for extracting a signal of each terminal from the output y of each receiving means; And a maximum size selection means for selecting and outputting at least one signal from a plurality of candidates (M, where M is a natural number of two or more) of the received signals for each terminal by comparing the intensity of the outputs of the signal discrimination means. Provided is a receiving apparatus using a multibeam array antenna.

In the signal transmission method using a multi-beam array antenna, a signal (S _m: m = 1, 2, ... M) for transmission is a plurality of beams (N, where N is a natural number of 2 or more). Determining one output terminal of the one-to-N demultiplexer using the control signal output from the maximum size selecting means upon reception; Phase shifting a signal S _m to be transmitted by the complex gain vector selected by the demultiplexer; And adding a corresponding transmission signal of each phase shifted element and then transmitting the signal from each antenna element through a known transmission procedure.

In addition, in the signal transmission method using the multi-beam array antenna, a signal for transmitting (S _m: m = 1, 2, ... M) is subjected to a known transmission signal processing procedure, and then a large number (N, N). Determining any one output terminal of the one to N demultiplexer using a control signal output from the maximum size selection means among the beams)); Phase shifting a signal S _m to be transmitted with the phase delay vector selected by the demultiplexer; And adding a corresponding transmission signal of each phase shifted element, and then performing a high frequency shift and amplification to transmit the signal through each antenna element.

For reference, an array antenna is a device including a plurality of antenna elements. Each antenna element is arranged according to a predetermined arrangement principle, and the antenna is transmitted or received by applying a desired phase delay to each antenna element. It is possible to adjust the beam pattern of the city, the basic technology related to this has already been filed by the applicant of the Patent Application No. 873 (January 17, 1996), 1996 Patent Application No. 12171 (April 18, 1996) , 1996 Patent Application No. 12172 (April 18, 1996), 1996 Patent Application No. 17931 (May 25, 1996) and 1996 Patent Application No. 25377 (June 28, 1996).

In particular, the present invention provides a technique for properly adjusting the beam pattern of the base station array antenna, but provides a technique requiring a simple configuration and control process than the above-described prior invention technology.

As described above, the method of adjusting the beam pattern using the array antenna can be realized by applying an appropriate phase delay to the antenna element, but there are two ways to add a phase delay to the antenna element.

The first method is to use a phase delay element directly to the signal of each antenna element to delay as much of the phase (phi`) as desired, which is typically a high frequency band, for example a carrier frequency band, or In some cases, it is performed in an intermediate frequency band.

The second method is performed in the base band, and a desired phase delay is applied to a complex signal obtained by separately extracting in-phase and quadrature components of each signal to be transmitted or received. This is a method of multiplying the complex gain (e ^ {j`phi} `) by making (phi`) the exponent.

However, the above two methods are equivalent mathematically and eventually have the same effect and result. However, since the first method uses a phase delay element, the resolution is limited by the resolution of the phase delay element, and the cost of the element is relatively high, so the second method of multiplying the complex gain is mainly used. Is used. Of course, it is apparent that the above two methods can be applied to the present invention.

There are two ways to actually implement the technique of adjusting the transmission and reception beam pattern of the base station using an array antenna.

The first method is to create a beam pattern for tracking each terminal in the base station, and the second method is to select a beam corresponding to each terminal from a plurality of narrow beam patterns by creating several fixed narrow beam patterns. That's the way.

The present invention provides a description of the second to second solution. In other words, as shown in FIG. 1B, consider a base station that covers one cell (considering one sector for convenience) with a narrow angle beam of several (three in FIG. 1A and 1B are considered).

When a terminal moves as illustrated in FIG. 1B, when a beam is switched in order of beam # 1-> beam # 2-> beam # 1-> beam # 2-beam # 3, the corresponding beam Interference from other terminals that are not in can be greatly attenuated.

That is, the cover range is divided into several narrow beams, and when receiving a signal of the target terminal, the corresponding narrow beam is selected and received, thereby attenuating interference from the terminal in the cover range of the other narrow beams. It is a fundamental idea of the present invention.

Such an antenna system is three times (three narrow angles) in terms of interference signal power if the beam selection switching is perfect and ignores the effects of side lobes of each narrow beam compared to the conventional antenna system as shown in FIG. 1A. You can see the gain of the case of dividing into beams. Therefore, in this case, a three times increase in capacity can be obtained.

Since the basic theory of the method of forming the beam of the array antenna by applying a phase delay to the signal of each antenna element is well introduced in the contents of the application filed by the applicant of the present application introduced above, in the present invention, three antenna elements as shown in FIG. The beamforming principle of the array antenna forming three narrow beams will be briefly described.

For practical design, consider a sector with an azimuth angle of 120 ^o , the standard sector in Korea. That is, the antenna must cover a range of 120 ^{o in} the azimuth.

2

]으로 된다.Thus, the three narrow beams should cover 40 ^o each. (Of course, some overlapping cover is inevitable in actual case, but for the convenience of explanation, overlapping cover is omitted.) First, to make beam # 1, -40 ^o must be tilted from the center, so the signal of each antenna element The phase delay to be applied to each is [0

2

].

]이 된다. 마찬가지 원리로 도 1b에 나타나 있는 3개의 빔, 즉 빔#1, 빔#2, 그리고 빔#3를 만들기 위해서는 각각 다음과 같은 이득 벡터가 필요하다.Or, as mentioned above, the gain value to be multiplied by the signal of each antenna element is [1

]. Similarly, to produce the three beams shown in FIG. 1B, that is, beam # 1, beam # 2, and beam # 3, the following gain vectors are required.

= [ 1

] => 빔#1을 만들기 위한 이득벡터

= [1

] => Gain vector for beam # 1

= [ 1 1 1 ] => 빔#2를 만들기 위한 이득벡터

= [1 1 1] => gain vector for beam # 2

= [ 1

] => 빔#3를 만들기 위한 이득벡터

= [1

] => Gain vector for beam # 3

,

,

를 그대로 이용할 수 있다.As noted above, making a narrow multibeam is already well known in theory. In other words, when making three narrow beams in the cover range of 120 ^o

,

,

Can be used as is.

However, in order to actually implement an array antenna system providing a narrow angle beam in an antenna system for a base station, it is necessary to accurately determine which beam corresponds to each terminal, and such determination may correspond to a moving speed of each terminal. It must be done quickly so that it can be applied to time conversion signal environment such as mobile communication.

The contribution of the present invention can be summarized as follows:

First of all, in the array antenna system of a base station using a plurality of narrow angle beams as described above, it provides a method of accurately and quickly determining which beam belongs to each terminal to accurately switch the corresponding beam to each terminal.

And second, by using the accurate and fast beam discrimination method as described above, to provide a base transceiver station using a multi-narrow beam.

In addition, another significant contribution provided by the present invention is the phase arrangement of the gain vectors mentioned above.

That is, it is a matter of which antenna element the reference phase of the gain vector should be adjusted. In the conventional case, the signal phase of the antenna where the signal with the latest phase is induced in reception, and the signal with the fastest phase in transmission are used. Although a method of setting the signal phase of the antenna to which the antenna is transmitted as a reference antenna has been proposed, the present invention proposes a method of setting the signal phase at the center position of the antenna array as the reference phase in both transmission and reception.

As described above, the method of setting the signal phase at the center position of the antenna array as the reference phase will be described in more detail as follows.

방향으로 협각빔을 만들기 위해서는 인접한 안테나 소자간의 위상차이가

이어야 한다.(단, d는 인접 안테나 소자간 거리, λ는 사용신호의 반송주파수에서의 파장 임)Incidence angle regardless of the number of antenna elements

To make a narrow beam in the direction, the phase difference between adjacent antenna elements

Where d is the distance between adjacent antenna elements and λ is the wavelength at the carrier frequency of the signal used.

However, since the phase difference between each antenna element is a relative value, various cases may be considered.

For example, to give a phase difference of 10 ° between two adjacent antenna elements, give a phase of χ ° to one antenna and give χ ° + 10 ° to the other. Therefore, the number of cases where a phase difference of 10 degrees between two antennas is numerous depends on how the value of χ is given. This problem is solved by determining which antenna element's signal is the reference phase.

In a preferred embodiment of the present invention as a solution to the problem associated with the reference phase, a method of determining the phase of the signal at the center position of the antenna array as the reference phase is proposed.

Consider the case where the narrow beam is made with the three antenna elements as the incident angle in the 40 ° direction.

이여야 하므로

인 선형안테나 배열인 경우에는

만큼의 위상차를 주어야 한다.To make a narrow beam with an angle of incidence of 40 °, the phase difference between adjacent antennas

Must be

Is an array of linear antennas

You should give as much phase difference.

However, in order to determine the center position of the antenna array as the reference phase, the gain vectors for making the beam # 1, the beam # 2, and the beam # 3 are respectively

Should be

대신에

를 사용하여야 한다. 여기서,

의 정 중앙요소는 모두 실수이므로, 안테나 배열의 정중앙에 위치한 안테나 소자에 유기되는 신호의 위상이 송수신에 다른 안테나 소자의 신호에 기준이 됨을 알 수 있다.That is, the gain vector applied to the antenna element located in the center of the antenna array (in this case, the second antenna) should be real. Therefore, in view of the reference phase proposed in the preferred embodiment of the present invention, the gain vector mentioned above.

Instead of

Should be used. here,

Since all of the center elements are real, it can be seen that the phase of a signal induced in the antenna element located in the center of the antenna array is a reference to signals of other antenna elements for transmission and reception.

However, in some cases, there is a problem in using the antenna element as a reference antenna at the center of the antenna array as suggested by the preferred embodiment of the present invention.

That is, in the case of the linear antenna array, if the number of antennas is even, there is no antenna element in the center of the array. In this case, it is assumed that the antenna element is located at the center of the antenna array, and the phase of the signal to be induced in the virtual antenna element may be referred to.

For example, consider the case of four antenna elements.

인 등간격 안테나 배열인 경우, 입사각

로 협각빔을 설정하려면 다음과 같은 이득 벡터를 사용해야 한다.According to the proposed technique according to the preferred embodiment of the present invention with respect to the above-mentioned reference phase,

Angle of incidence

To set the narrow angle beam, the following gain vector should be used.

In summary, in order to properly set the reference phase in the antenna array, if each element of the gain vector is represented as a complex plane vector, the result of the vector sum of the element vectors of the gain vector is obtained. It can be seen that it must be a mistake.

Therefore, the reference phase determination method proposed in the preferred embodiment of the present invention can be summarized as follows.

(단, ??_R는 이득벡터의 R번째요소의 위상으로써,

임)의 조건을 만족해야 한다.The phase at the center position of a given antenna array becomes the reference phase, and thus, the phase at the center position of the antenna array as the reference phase means that all gain vectors (ω) for making the narrow beam are

(Where ?? _ R is the phase of the Rth element of the gain vector,

Must satisfy the following conditions.

By normalizing the gain vector so that the reference phase is determined as described above, a correct gain vector can always be obtained regardless of the shape of the antenna array.

As another case, for example in the case of a circular antenna array, the reference phase is the phase at the center point of the circular array.

In addition, when the distances between the antenna elements are not equally spaced or when the sizes of the elements of the gain vector are different from each other in the foregoing description, the technique proposed in the above-described preferred embodiment of the present invention is used. The correct reference phase can always be determined appropriately.

As a result, considering all these cases, the condition of the gain vector that gives the correct reference phase can be generalized as follows.

임).(Where superscript * represents complex conjugate, W_R is the Rth element of gain vector,

being).

이 실수가 되어야 함을 의미하고 있다.The upper expression is

This means it should be a mistake.

For each terminal in the sector, consider FIG. 1B again to see which of the narrow beams to select and switch.

Initially, when the terminal is within the cover range of the beam # 1, of course, the signal of the terminal should be received by the beam # 1 to obtain a larger reception power than when received by other beams. As the terminal moves, the signal received by the corresponding beam becomes stronger than the signal received by the other beam.

Therefore, the present invention intends to match the basic principle of selecting the narrow angle beam to the size of the received signal. That is, a method of receiving a corresponding terminal as a beam providing the largest reception power by comparing the magnitudes of the signals received by the respective beams in each sampling period is adopted. Further, the transmission is performed using the same beam as the beam determined at the time of reception in the same time zone.

However, when comparing the strength of the received signal, the magnitude of the received signal should be compared after completing accurate reception according to the signal environment. That is, since the signal received by each narrow beam includes the signals of all the terminals in the cover range of the narrow beam, the step of extracting each terminal signal from the received signal of each narrow beam should be included.

Now consider FIGS. 2, 6 and 7.

There are a total of M terminals in the sector and the array antennas of the base stations all have N antenna elements.

As described above, when using an antenna element that accurately covers the range to be covered (reasonably accurately, or, with an acceptable accuracy), N gain vectors are easily obtained by using a known beamforming technique. N narrow angle beams may be formed that cover a range divided into several narrow angles, for example, divided into three narrow angle beams as shown in FIG. 1B.

FIG. 2 illustrates a base station for forming N narrow beams using N gain vectors.

6 and 7 illustrate a base station that forms N narrow beams using N phase delay vectors.

However, all three systems are mathematically equivalent, except that the elements forming the array beam are different.

Therefore, the description of the present invention will be described in more detail with focus on FIG. 2, and the remaining embodiments of FIG. 6 and FIG. 7 can be briefly described because they can be interpreted by the same theory.

2 is a configuration diagram of a first embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention. In the drawing, 1 denotes an antenna element, 2 denotes a receiver, 3 denotes a multiplier, 4 denotes an adder, 5 denotes a signal separator, and 6 denotes a maximum size selector.

In the embodiment of FIG. 2, a cover range is divided into N narrow ranges by using N gain vectors in an antenna array including N antenna elements.

That is, the values of N gain vectors are determined using the known beamforming theory mentioned above and used in FIG. 2 as follows:

w ₁ = [w _1,1 w _1,2 . . . w _{1, N} ],

w ₂ = [w _2,1 w _2,2 . . . w _{2, N} ],

. . . . . . . . . . . . . . . . . . . . ,

w _N = [w _{N, 1} w _{N, 2} . . . w _{N, N} ].

In the present invention, a technique of forming N narrow beams with an array antenna consisting of N antenna elements is introduced, but the technique for forming such a beam is a technique already known in the art, and the gist of the present invention is such a known signal. A narrow angle beam formed by using a processing technique is selected for each terminal signal, and an array antenna system is implemented using the selection technique.

Similarly, an array antenna consisting of N antenna elements may be formed using a known signal processing technique to form a narrower angle beam than N, which may be used for transmission and reception. Such a technique may be used without transcribing the gist of the present invention. Since it can be easily implemented, a description thereof will be omitted.

As a result, in the present invention, how to select a narrow angle beam for each terminal, and a transmission and reception apparatus using the selection technology are the main subjects of discussion.

As shown in FIG. ₂ , N narrow beams may be formed as in the first (b) using _N gain vectors w ₁ , w ₂ ,.... Similarly, as shown in FIGS. 6 and 7, by forming N narrow angle beams using N phase delay vectors, an array antenna device covering the entire cover range by N narrow angles can be manufactured.

As mentioned above, it is assumed that each antenna element covers the entire cover range with a satisfactory performance.

As shown in Fig. 2, the output received signals of the array antennas received by the respective narrow beams are y ₁ , y ₂ ,. . . , y _N , the signal y _i received by the i th beam is expressed as follows.

=

(1)y _i =

=

(One)

는 이득벡터를

는 각 안테나 소자에서 수신된 신호를 주파수 저역 천이 및 복조 등의 수신과정을 거쳐 얻은 수신 신호벡터를 나타내고, 윗첨자 H는 Hermitian 연산자를 나타낸다. 또한, 굵은 글자는 소문자인 경우에는 벡터를, 대문자인 경우에는 행렬을 의미한다.Where w_i, n` are complex gains multiplied by the n-th antenna element for forming the i-th beam, superscript * is complex conjugate,

Is the gain vector

Denotes a received signal vector obtained by receiving a signal received from each antenna element through a frequency low pass transition and demodulation, and a superscript H denotes a Hermitian operator. In addition, bold letters mean vectors for lower case letters and matrices for upper case letters.

를 배열 안테나의 입력 수신 신호벡터라 하고, y를 배열 안테나의 출력이라 한다.In the present invention, the design of the array antenna system is to determine the complex gain (which is a phase delay value in the case of FIG. 6 or FIG. 7) to be multiplied by each antenna element.

Denotes an input received signal vector of the array antenna and y denotes an output of the array antenna.

In Equation (1), the received signal x 'includes the signals of all terminals transmitting in the cover range. Thus, the received output signals y ₁ , y ₂ ,. . Since each of., y _N includes all the terminal signals within the coverage, the base station must separately extract each terminal signal.

The present invention focuses on quickly and accurately discriminating whether to extract each terminal signal from a received output signal received by a beam. That is, if the signal transmitted from the m-th terminal is S _m , it should be determined which beam S _m of the N beams is to be received. Of course, it should be received in a beam covering the place where the m-th terminal is located.

The present invention focuses on the fact that the beam covering the place where the m-th terminal is located is the beam that receives the signal S _m transmitted by the m-th terminal the hardest. Extraction of terminal signals can be quickly and accurately fractionated.

In the present specification, y _i is an output signal of the array antenna received in the i-th beam. Output signals y ₁ , y ₂ , of the array antenna received with multiple narrow beams in FIGS. 2, 6, and 7. . . After generating y _N , as mentioned above, with respect to the signal transmitted from each terminal, it is necessary to determine which beam received signal should be selected.

To this end, the beam selection technique provided by the present invention can be summarized as follows:

First, the signals y ₁ , y ₂ , received by the respective beams using a receiver and a complex gain vector or phase delay vector, which are predetermined according to the signal environment. . . , y _N

Secondly, each of the received output signals is separately input to the signal classifier to separate the signals received by each narrow angle beam for each terminal signal.

Finally, a signal having the largest magnitude is selected by comparing the magnitudes of the received output signals received by each narrow beam with respect to each terminal signal, and determined as the received signal of the corresponding terminal.

When the base station transmits a signal, the narrow angle beam determined at the time of reception is used to make the reception and transmission directions coincide at the same time. To this end, there are two output stages of the maximum size selector, one of which is the signal of the maximum size among the signals received by the N narrow beams mentioned above, and the other which indicates in which beam the signal of the maximum size is received. Control signal. This control signal is used as a control signal for selecting the narrow beam at the time of transmission. More detailed use of this control signal is introduced in detail in the description of FIGS. 8 and 9.

Hereinafter, the embodiments shown in the accompanying Figures 2 to 9 will be described in detail.

Implementation Techniques Using Complex Gain Vectors

According to the present embodiment, a narrow angle beam is formed using a complex gain vector, and FIG. 2 is a configuration diagram of a first embodiment of a receiving apparatus using a multibeam array antenna according to the present embodiment.

In the figure, w _{i, j} is the j (j = 1, 2, .N) th weight (weight) of the i (i = 1, 2,... N) th beam, and S _{i, m} is i ( i = 1, 2,... N) m (m = 1, 2,... M) th terminal signal received in the i th beam, y _i is the received signal received in the i th beam, x` _n is n Each received signal received by the first antenna element is shown.

As shown in the drawing, the receiving device proposed in this embodiment performs frequency low-pass transitions and demodulations on a plurality of antenna elements 1 and a signal induced in the plurality of antenna elements 1. The plurality of signal receivers 2 and the plurality of received signals x ' ₁ , x' ₂ ,... _X ` _N respectively output by the plurality of signal receivers 2 are divided so as to cover the cover range. A plurality of multipliers (3) to ensure that their values are multiplied for each element of a plurality of predetermined complex gain vectors (w ₁ ^* , w ₂ ^* ,... W _N ^* ) by known signal processing techniques; A plurality of adders 4 which provide the received output signals y ₁ , y ₂ ,. Y _N for each beam by adding the multiple multiplier outputs by beam and adding the respective received output signals _{(y 1, y 2,.} .. y N) to the adder from the terminal for extracting the respective signals And signal fractionator 5 of the number of, and a maximum size to a selector (6) for comparison to the intensity of the output reproducing the signal transmitted from the terminal, each of said signal fractionator.

를 형성한 후, 위에서 언급한 바와 같이, 공지의 빔형성 기술로 결정된 이득벡터들(w₁ ^*, w₂ ^*, . . . w_N ^*)로 처리(

와의 Euclidean inner product, 즉, y_i=

)되어 각각의 협각빔으로 수신한 배열 안테나의 출력 수신신호(y₁, y₂, . . . y_N)를 이루게 되는 것이다.Thus, the signal received at each antenna element is subjected to the received signal vector of the array antenna through the usual reception procedures such as frequency low-transition and demodulation.

After forming a process, as mentioned above, processing is performed with gain vectors w ₁ ^* , w ₂ ^* ,... W _N ^* determined by a known beamforming technique.

Euclidean inner product with y _i =

Then, the output reception signals (y ₁ , y ₂ ,.. Y _N ) of the array antennas received by the narrow angle beams are formed.

In the reception device according to the present embodiment, the reception output signal y _i received by the i-th beam is input to the signal discriminator 5 designed and designed for the signal environment. The signal classifier 5 is a device that separates and extracts respective terminal signals by processing signals received from all terminals within a cover range.

Therefore, as illustrated in FIG. 3A, in the case of CDMA, M (cross correaltion) with a code sequence q _m (where m = 1, 2,... M) of each terminal is used. Number of terminals within the coverage range).

In addition, as shown in FIG. 3B, when the signal environment is TDMA, M signals are synchronized during one frame period (T _F : frame period) and correspond to each burst period (T _B : burst period). A commutator sampling the signal of the terminal forms a signal discriminator.

Similarly, when the signal environment is FDMA as shown in FIG. 3C, M band pass filters (BPFs) whose center frequencies are aligned with the carriers allocated to each terminal form a signal separator. In the figure, f _m is the carrier frequency assigned to the m (m = 1, 2, ... M) terminal, and f _{c, m} represents the center frequency of the band pass filter (BPF) split to the m terminal. will be.

Accordingly, signals transmitted from each terminal and received by N narrow beams are classified into respective terminal signals by a signal classifier, and each terminal signal is determined by determining which signal is received with which narrow beam. You will choose a large signal.

That is, the output signals y _i (i = 1, 2, ... N) of the array antenna received by the i th beam are each M cross correlators, depending on whether the signal environment is CDMA, TDMA, or FDMA. It is input to a commutator or signal separator consisting of a bandpass filter (BPF).

Thus, for each terminal signal, the signal received by beam # 1, the signal received by beam # 2,. . . In this case, N candidates are obtained for each terminal signal.

For example, when receiving the signal S _m transmitted from the m-th terminal, as shown in Figs. 2, 6, 7, and 4, S _{1, m,} which is a signal received by beam # 1, and beam # S _{2, m,} which is the signal received by _2, and. . . N candidates such as S _{N and m,} which are signals received by the beam #N, are obtained.

However, as mentioned above, if a terminal transmits a signal within the coverage range of beam #i, S _{i, m} received by the i-th beam is the largest. Therefore, in the reception antenna array, the one having the largest size among the N candidates of the received signals for each terminal may be selected.

In conclusion, in the present invention, S _{1, m} and S _{2, m} and. . . Among the N candidates of S _{N, m} , S _{i, m} having the largest size is selected as the reception output.

However, in a signal environment in which multiple paths exist, two or more communication paths exist, and the signals received by a plurality of narrow beams are all quite strong. In this case, according to the signal environment (CDMA, TDMA, FDMA) according to the signal environment (CDMA, TDMA, FDMA) in the selection of the narrow angle beam, the signal is properly classified according to the above-mentioned method, and the final magnitude of the signal received in each narrow beam is It is also possible to select all of a plurality of signals larger than a predetermined predetermined value, add the selected signals, and then use the resultant signal.

4A shows a maximum size selector 6 for selecting N candidates for each of M received signals.

The maximum size selector outputs a control signal for notifying the number of beams selected at the time of reception so that the base station uses the same beam at the same time as the reception beam at the time of transmission, together with the maximum size reception signal. .

In addition, FIG. 4B illustrates the maximum size selector 6 in the case where a plurality of signals in which the final magnitude of the signal received in each narrow beam is larger than a predetermined predetermined value are added together and then used as a result.

As shown in the drawing, the maximum size selector in this case includes a maximum size selector 6a for selecting both signals when the p-th and q-th signal strengths of the N narrow beams are similarly large, and And a signal summing section 6b which adds and outputs all the signals selected by the maximum size selecting section 6a. At this time, the control signal output from the maximum size selector 6a is output for all selected signals p and q.

FIG. 5 is a diagram illustrating a case where the CDMA signal discriminator of FIG. 3A and the maximum size selector of FIG. 4 are applied to the receiver of the first embodiment of FIG.

8 is a configuration diagram of a first embodiment of a transmission apparatus using a multi-beam array antenna according to the present invention, and is a device for transmitting signals from a base station to M terminals by forming a plurality of narrow beams with a complex gain vector.

As shown in the figure, a number of signals S _m (m = 1, 2,... M) to be transmitted to each terminal (for example, to the mth terminal) is different from the number of antenna elements in this embodiment. The same N pieces are considered, but not necessarily so limited) and one of the narrow beams is transmitted.

In the present invention, among the narrow angle beams, the same beam as that used in the reception mode at the same time is used. This is because, since the reception is performed using a beam providing the maximum size at the time of reception, when the beam used at the same time is used at the same time, it can be correctly transmitted to the beam covering the corresponding terminal. To this end, the maximum size selector is configured to output a beam providing the maximum received power as a control signal at the time of reception so as to receive a beam providing the maximum size from the maximum size selector.

As with reception, several narrow-angle beams are formed with complex gain vectors preset by known signal processing techniques to define and cover the coverage.

Based on the first implementation technique using the complex gain vector as described above, the process of transmitting a signal from the base station to the m-th terminal can be summarized as follows. In addition, simultaneously transmitting signals to the M terminals may be performed independently on the M transmission signals.

First, the control signal S _m (m = 1, 2, ... M) to transmit is a control signal output from the maximum size selector at the time of reception among several beams (considering N in the embodiment of the present invention). Determine the output stage of the 1-to-N demultiplexer using. At this time, the determined output stage takes the same beam as the narrow angle beam determined at the time of reception.

Second, in order to transmit S _m with a narrow beam selected from among N beams, the signal S _m to be transmitted with a complex gain vector selected by the 1-to-N demultiplexer is phase shifted.

Finally, each of the phase shifted transmission signals is appropriately added and then transmitted from each antenna element through known transmission procedures such as modulation, high frequency shift, and amplification.

Implementation Techniques Using Phase Delay Vectors

The present implementation technique of forming the narrow angle beam using the phase delay vector is illustrated as the preferred embodiment in FIGS. 6 and 7.

6 is a configuration diagram of a second embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention.

The receiving device provided in the present implementation technique includes a plurality of antenna elements 1 and a plurality of low noise amplifications for performing low noise amplification or intermediate frequency shift with respect to signals induced in the plurality of antenna elements 1, and The intermediate frequency shifter 7 and the plurality of received signals x` <sub>1</sub> , x` ₂ ,... X` _N respectively output by the plurality of low noise amplification and intermediate frequency shifters 7 cover. A number of phase delays are known in the signal processing technique to cover the ranges so that their values are phase delayed by the elements of a plurality of predetermined phase delay vectors (Φ ₁ , ?? Φ ₂ ,... Φ _N ). Element (PS) 8 and a plurality of beams that provide the received output signal y ₁ , y ₂ ,. Y _N for each beam by adding the outputs of the phase delay elements on a beam-by-beam basis. Are respectively connected to the adder 4 and corresponding outputs of the plurality of adders 4, respectively. A plurality of receivers 2 for performing frequency low-pass transitions, demodulation, etc., and extracting the signals of the terminals from the output signals y ₁ , y ₂ ,. Y _{N of the} respective receivers; And a plurality of maximum size selectors 6 for reproducing a signal transmitted from each of the terminals by comparing the number of signal separators 5 corresponding to and the intensity of the outputs of the signal separators.

Thus, the signal received at each antenna element is divided into a cover range through a plurality of low noise amplifying elements or intermediate frequency shifting elements 7 so as to cover the divided range of the plurality of phase delay vectors. The plurality of adders which pass through the plurality of phase shifters (PS) 8 for phase-delaying the signal according to a vector value, and then add the outputs of the phase delay elements to provide an output reception signal y. After passing through (4), the output reception signals (y ₁ , y ₂ ,.. Y _N ) of the array antennas received by each narrow beam are achieved. The output received signals of the array antenna are input to the signal classifier 5 so that all subsequent signal flows are the same as the operation of the subsequent stage of the signal classifier of FIG.

7 is a configuration diagram of a third embodiment of a receiving apparatus using a multi-beam array antenna according to the present invention, in which all signal flows are the same as those of FIG. 6, but only the signals induced in each antenna element are shown in FIG. 6. While the phase delay is performed after the frequency shift to the intermediate frequency band, in FIG. 7, the phase delay for forming the narrow beam is directly different in the carrier frequency band of each received signal.

3A to 3C show a signal discriminator, the purpose of use and features of which are the same as those of the first implementation technique.

In other words, the receiving device considering the signal environment (signal correlator in case of CDMA, sampling device synchronized with each terminal signal in case of TDMA, and tuning of carrier signal in case of FDMA in case of FDMA) After passing through the band pass filter, it is a device that separates each terminal signal. The number of signal separators required in the receiving device using one array antenna is the same as the number of the narrow angle beams, and the output receiving signal y _i received by each narrow angle beam for each signal discriminator is inputted, As such, the coverage of the receiver (correlator in case of CDMA, sample device in synchronization with each terminal signal in case of TDMA, band pass filter tuned by carrier frequency of terminal signal in case of FDMA) according to the signal environment is covered. Each signal classifier provides M output stages.

4A and 4B are maximum size selectors, which are used for the same purpose as in the first implementation technique mentioned above. That is, it is a device that selects the largest by comparing the magnitude of the result of receiving the signals of each terminal in each narrow beam.

The maximum size selector selects the strongest of the signals received by the N beams, and when the base station transmits a signal, the control signal is used to select the number of signals to use the same beam as the reception at the same time zone. Output In addition, in the multi-signal environment, as shown in FIG. 4B, when receiving one signal, two or more narrow angle beams may be simultaneously selected, and the selected signals may be added and then output and used.

In the second implementation technology, the array antenna device as shown in FIG. 5 can be easily configured in consideration of any specific signal environment, for example, CDMA. However, the reason for considering only the first embodiment in FIG. 5 is because, as mentioned above, it is advantageous to process the signal in software using a complex gain vector rather than using a phase delay element.

9 is an array antenna apparatus for transmitting signals from a base station to M terminals by forming a plurality of narrow angle beams using a phase delay vector.

Except for using a phase delay vector instead of a complex gain vector for beamforming, it has the same purpose and function as the case of FIG. According to the second embodiment, the process of transmitting a signal from the base station to the m-th terminal can be summarized as follows.

Therefore, simultaneously transmitting signals to the M terminals may be performed independently on the M transmission signals.

First, a signal S _m (m = 1, 2, ..., M) to be transmitted is subjected to a known transmission procedure such as modulation and frequency high-transition (assuming that S _m ), and then several (N in the present invention) The output signal of the 1-to-N demultiplexer is determined using the control signal output from the maximum size selector at the time of reception. At this time, the determined output stage takes the same beam as the narrow angle beam determined at the time of reception.

Second, in order to transmit S _m with a narrow angle beam selected from among N beams, the signal S _m to be transmitted with the phase delay vector selected by the 1-to-N demultiplexer is phase shifted.

Finally, each of the phase shifted transmission signals is appropriately added, and then transmitted from each antenna element through a known transmission procedure such as high frequency shift or amplification. However, in this process, the frequency high-pass transition process may overlap before the amplification procedure in each antenna element.

In addition, the present invention as described above can be suitably used for base station design in a mobile communication environment of a code division multiple access (CDMA) scheme, and time division multiple access (TDMA). ) Or a base station design in a signal environment using a frequency division multiple access (FDMA) scheme.

The present invention has been presented in order to make it easier to understand the technical gist of the present invention, rather than to limit the scope of the above-described embodiments and the accompanying drawings, which are within the scope of the technical spirit of the present invention. It is apparent to those skilled in the art that various permutations, modifications, and alterations are possible in the art, and therefore, such various permutations, modifications, and alterations are within the scope of the present invention.

In the array antenna system of the base station using a plurality of narrow angle beams as described above, it is possible to accurately and quickly determine which beam belongs to each terminal and to switch the corresponding beam to each terminal accurately. In this case, an antenna array for a base station using multiple narrow angle beams can be easily implemented.

Claims (25)

In the beam selection method of a multi-beam array antenna, Performing a low frequency shift and demodulation on the signals received at each antenna element to form a received signal vector x of the array antenna; Euclidean inner product of the received signal signal vector (x) and a predetermined gain vector (w ₁ , w ₂ ,... W _N ) (y _i = w _i ^H x), each narrow angle A second step of generating an output reception signal y ₁ , y ₂ ,... Y _N of the array antenna received by the beam; A third step of separating and extracting each terminal signal by processing signals received from all terminals within a cover range with a signal separator designed according to the corresponding signal environment; And A fourth step of selecting a signal having the largest size among a plurality of candidates (N, where N is a natural number of 2 or more) of the received signals for each terminal in the reception antenna array; And the gain vector is determined so that the signal phase of the reference antenna element does not change. In the beam selection method of a multi-beam array antenna, A first step of frequency low-pass shifting and demodulating the signals received at each antenna element to form a received signal vector x of the array antenna; Euclidean inner product of the received signal signal vector (x) and a predetermined gain vector (w ₁ , w ₂ ,... W _N ) (y _i = w _i ^H x), each narrow angle A second step of generating an output reception signal y ₁ , y ₂ ,... Y _N of the array antenna received by the beam; A third step of separating and extracting each terminal signal by processing signals received from all terminals within a cover range with a signal separator designed according to the corresponding signal environment; And A fourth step of selecting at least one received signal having a predetermined level or more from among a plurality of candidates (N, where N is a natural number of two or more) of the received signals for each terminal in the reception antenna arrangement; And a value of the gain vector is determined so that a signal phase of a reference antenna element does not change. The method according to claim 2, And a fifth step of adding and outputting all the received signals selected in the fourth step. The method according to claim 2, The reference antenna element, And an antenna element located at the center of the antenna array. The method according to claim 2, The reference antenna element, If there is no antenna element located at the center of the antenna array, it is assumed that a virtual antenna element is located at the center of the antenna array, and the signal phase of the virtual antenna element is determined as a reference phase. Beam selection method of array antenna. In the receiving device using a multi-beam array antenna, A plurality of antenna elements; Signal reception means for receiving a signal received by the plurality of antenna elements for frequency-wide transition and demodulation; A plurality of multiplying means for multiplying a plurality of complex gain vectors whose values are predetermined such that the plurality of antenna elements share and divide the entire cover range; A plurality of addition means for adding an output of the multiplication means to provide a received output signal (y); A plurality of signal discriminating means for extracting a signal of each terminal from the respective received output signals; And And a maximum size selecting means for selecting and outputting at least one signal among a plurality of candidates (M, where M is a natural number of two or more) of the received signals for each terminal by comparing the intensity of the outputs of the signal discriminating means, The signal discriminating means may include a cross correlator for correlating the code sequence q _m of each terminal for the CDMA signal environment (where m = 1, 2,..., M) within the coverage. Equipped with a number corresponding to the number of terminals (M), And a gain vector applied to the multiplying means is a value whose signal phase of a reference antenna element does not change. In the receiving device using a multi-beam array antenna, A plurality of antenna elements; Signal reception means for receiving a signal received by the plurality of antenna elements for frequency-wide transition and demodulation; A plurality of multiplying means for multiplying a plurality of complex gain vectors predetermined so that the plurality of antenna elements share and divide the entire cover range; A plurality of addition means for adding an output of the multiplication means to provide a received output signal (y); A plurality of signal discriminating means for extracting a signal of each terminal from the respective received output signals; And And a maximum size selecting means for selecting and outputting at least one signal among a plurality of candidates (M, where M is a natural number of two or more) of the received signals for each terminal by comparing the intensity of the outputs of the signal discriminating means, The signal discrimination means is a terminal corresponding to each burst period while keeping synchronization for a number of signals corresponding to the terminal number M for one frame period for a TDMA signal environment. It has a communicator (communitator) for sampling the signal of And a gain vector applied to the multiplying means is a value whose signal phase of a reference antenna element does not change. In the receiving device using a multi-beam array antenna, A plurality of antenna elements; Signal reception means for receiving a signal received by the plurality of antenna elements for frequency-wide transition and demodulation; A plurality of multiplying means for multiplying a plurality of complex gain vectors whose values are predetermined such that the plurality of antenna elements share and divide the entire cover range; A plurality of addition means for adding an output of the multiplication means to provide a received output signal (y); A plurality of signal discriminating means for extracting a signal of each terminal from the respective received output signals; And And a maximum size selecting means for selecting and outputting at least one signal among a plurality of candidates (M, where M is a natural number of two or more) of the received signals for each terminal by comparing the intensity of the outputs of the signal discriminating means, The signal discrimination means corresponds to a band pass filter (BPF) whose center frequency is adjusted to the carrier of the channel assigned to each terminal for the FDMA signal environment, corresponding to the number of terminals (M) within the cover range. Equipped with a number to And a gain vector applied to the multiplying means is a value whose signal phase of a reference antenna element does not change. The method according to claim 6, The maximum size selection means, In addition to the maximum size of the received signal, the base station outputs a control signal for notifying how many beams are selected at the time of reception so that the same beam is used at the same time as the beam at the time of transmission. Receiver using beam array antenna. The method according to claim 9, The maximum size selection means, Receiving apparatus using a multi-beam array antenna, characterized in that for selecting the largest signal from the plurality of (M) candidates. The method according to claim 9, The maximum size selection means, The reception device using the multiple beam array antenna, characterized in that to select all of the received signal of the predetermined level or more when a plurality of signals from the plurality of (M) candidates are received at a predetermined level or more. The method according to claim 11, Signal summing means for adding and outputting all received signals selected by the maximum size selecting means; Receiving device using a multi-beam array antenna further comprising. The method according to claim 6, The reference antenna element, Receiver device using a multi-beam array antenna, characterized in that determined by the antenna element located in the center of the antenna array. The method according to claim 6, The reference antenna element, When there is no antenna element located at the center of the antenna array, the virtual antenna element is assumed to be located at the center of the antenna array, and the signal phase of the virtual antenna element is determined as a reference phase. Receiver using array antenna. In the receiving device using a multi-beam array antenna, A plurality of antenna elements; A plurality of low noise amplification and intermediate frequency shifting means respectively connected to corresponding antenna elements of the plurality of antenna elements; A plurality of phase delay means for adding a plurality of phase delay vectors whose values are predetermined so that the plurality of antenna elements share the entire coverage range; A plurality of addition means for adding an output of said phase delay means to provide a received output signal y; A plurality of receiving means for receiving the output signal of the adding means for frequency low-pass transition and demodulation; Signal discriminating means for extracting a signal of each terminal from the output y of each receiving means; And And a maximum size selecting means for selecting and outputting at least one signal from a plurality (M, where M is a natural number of two or more) candidates of the received signals for each terminal by comparing the intensity of the outputs of the signal discriminating means, The signal discrimination means includes a cross correlator for correlating the code sequence p _m (where m = 1, 2,... M) of each terminal for a CDMA signal environment, within the coverage. Equipped with a number corresponding to the number of terminals (M), And a phase delay vector applied to the phase delay means is set to a value in which a signal phase of a reference antenna element does not change. The method according to claim 15, The signal classification means, For a TDMA signal environment, a multi-beam array antenna including a communicator sampling a signal of a corresponding terminal during each burst period while synchronizing with respect to the number of signals corresponding to the number of terminals (M) during one frame period. Receiving device using. The method according to claim 15, The signal classification means, For the FDMA signal environment, a band pass filter (BPF) having a center frequency aligned to a carrier of a channel allocated to each terminal is provided, and the number of band pass filters (BPF) corresponding to the number of terminals (M) within the cover range is provided. Receiver using a multi-beam array antenna comprising a). The method according to claim 15, The maximum size selection means, In addition to the maximum size of the received signal, the base station outputs a control signal for notifying how many beams are selected at the time of reception so that the same beam is used at the same time as the beam at the time of transmission. Receiver using beam array antenna. The method according to claim 18, The maximum size selection means, Receiving apparatus using a multi-beam array antenna, characterized in that for selecting the largest signal from the plurality of (M) candidates. The method according to claim 18, The maximum size selection means, And receiving all signals received above the predetermined level when a plurality of signals are received from the plurality of candidates. The method of claim 20, Signal summing means for adding and outputting all received signals selected by the maximum size selecting means; Receiving device using a multi-beam array antenna further comprising. The method according to claim 15, The reference antenna element, Receiver device using a multi-beam array antenna, characterized in that determined by the antenna element located in the center of the antenna array. The method according to claim 15, The reference antenna element, If there is no antenna element located at the center of the antenna array, it is assumed that a virtual antenna element is located at the center of the antenna array, and the signal phase of the virtual antenna element is determined as a reference phase. Receiver using array antenna. In the signal transmission method of a multiple beam array antenna system using the control signal output from the maximum size selection means of the receiver according to claim 15, The signal for transmission (S _m : m = 1,2 ..., M) is one-to-N demultiplexer using a control signal output from the maximum size selecting means among a plurality of beams (N, where N is a natural number). determining one output of a demultiplexer; Phase shifting a signal S _m to be transmitted by the complex gain vector selected by the demultiplexer; And Adding the corresponding transmission signal of each phase shifted element, and then transmitting from each antenna element through a known transmission procedure Signal transmission method comprising a In the signal transmission method of a multiple beam array antenna system using the control signal output from the maximum size selection means of the receiver according to claim 15, Signals for transmission (S _m : m = 1,2 ..., M) are processed by a known transmission signal processing procedure and then output from the maximum size selection means among a plurality of beams (where N is a natural number). Determining one output terminal of the one-to-N demultiplexer using the control signal; Phase shifting a signal S _m to be transmitted by the phase delay vector selected by the demultiplexer; And Adding the corresponding transmission signal of each phase shifted element, and then performing high frequency shift and amplification to transmit the signal through each antenna element. Signal transmission method for a multi-beam array antenna comprising a.

Images