KR101818120B1 - Transmitting Method And Apparatus Using MIMO - Google Patents

Abstract

The present invention relates to a spatial multiplexing transmission method and apparatus using multiple antennas, and a spatial multiplexing transmission method includes the steps of crossing different transmission power weights on sequential transmission signals, applying a transmission power weighted sequential transmission signal Precoding the parallel transmission signal, converting the precoded sequential transmission signal into a parallel transmission signal, and transmitting the parallel transmission signal to the first amplifier connected to the first antenna constituting the multiple antennas and the second amplifier connected to the second antenna constituting the multiple antennas. Cross inputting a signal and transmitting the input signal through multiple antennas. According to the present invention, the reception ranges for the signals transmitted to the respective antennas constituting the multiple antennas can be adjusted to be the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a spatial multiplexing transmission method and apparatus,

The present invention relates to wireless communication techniques and, more particularly, to a method and apparatus for performing spatial multiplexing transmission in a Multiple Input Multiple Output (MIMO) system.

MIMO techniques using multiple antenna systems achieve high data rates through multiple transmit and receive antennas.

On the other hand, in the MIMO technique, performance degradation occurs when correlation occurs between transmitting and receiving antennas. The conventional MIMO technique is generally applied to a mobile communication system. In this case, the antenna is designed using the assumption that the channel values between the transmitting and receiving antennas are independent.

On the other hand, unlike the case of mobile communication, a broadcast system has a high probability of correlation between transmitting and receiving antennas, and thus there is a problem of preventing performance deterioration.

An object of the present invention is to provide a method for increasing the transmission efficiency of a MIMO system to which unequal transmission power is applied.

An object of the present invention is to provide a method of adjusting the transmission power of a transmission signal output from each amplifier connected to antennas constituting multiple antennas equally.

An object of the present invention is to provide a method of adjusting the reception range of a signal transmitted to each antenna constituting multiple antennas equally.

In the conventional 2x2 spatial multiplexing, when two signals having different constellations are transmitted by OFDM on each transmission antenna, the unequal transmission power problem and the uneven PAPR problem caused by each transmission antenna are solved In addition, the problem of unequal reception due to asymmetry between the transmitting and receiving antennas is solved.

The present invention relates to a spatial multiplexing transmission method using multiple antennas, comprising: crossing different transmission power weights to sequential transmission signals; precoding a sequential transmission signal to which transmission power weights are assigned; Converting a transmission signal into a parallel transmission signal, crossing a parallel transmission signal to a first amplifier connected to a first antenna constituting multiple antennas and a second amplifier connected to a second antenna constituting multiple antennas, And transmitting the signal through multiple antennas.

At this time, the parallel transmission signals that are input to the first amplifier and the second amplifier may be input at the input time.

In addition, the parallel transmission signals input to the first amplifier and the second amplifier may be cross-input at predetermined intervals. Here, the predetermined period may be a cycle of a signal having the highest frequency among the signals constituting the parallel transmission signal.

The present invention also provides a spatial multiplexing transmission apparatus comprising: a precoder for precoding an input sequential transmission signal; a serial-to-parallel converter for converting a precoded sequential transmission signal into a parallel transmission signal; an amplifying unit for amplifying the parallel signal; And the amplifying unit includes a plurality of amplifiers connected to the respective antennas constituting the multiple antenna unit on a one-to-one basis, and the sequential transmission signals input to the precoder are given different transmission power weights , And the serial-parallel converter can cross-input the converted parallel transmission signals to the plurality of amplifiers.

In this case, the serial-parallel converter can input the parallel transmission signals to the plurality of amplifiers at the input time intervals.

In addition, the serial-parallel converter can cross-input parallel transmission signals to a plurality of amplifiers at predetermined intervals. Here, the predetermined period may be a period of a signal having the highest frequency among the signals constituting the parallel transmission signal.

In addition, the present invention solves the unequal transmission power problem and the non-uniform PAPR problem that may occur in each transmit antenna when two signals having different constellations are transmitted in OFDM in each of the conventional 2x2 spatial multiplexing In addition, the problem of inequality of receiving performance due to asymmetry between transmitting and receiving antennas is solved.

According to the present invention, it is possible to increase the transmission efficiency of a MIMO system to which unequal transmission power is applied.

According to the present invention, the transmission power for transmission signals output from the respective amplifiers connected to the antennas constituting the multiple antennas can be adjusted equally.

According to the present invention, the reception ranges for the signals transmitted to the respective antennas constituting the multiple antennas can be adjusted to be the same.

In the present invention, when two signals having different constellations are transmitted by OFDM in each transmission antenna in the conventional 2 × 2 spatial multiplexing, each half of the signals of different constellations are forcibly transmitted and transmitted, The problem of equal transmit power and nonuniform PAPR is solved, and the problem of unequal reception due to asymmetry between transmit and receive antennas is solved.

1 shows a schematic configuration of a MIMO system to which unequal transmission power is applied.
2 schematically illustrates a MIMO system to which unequal transmission power is applied.
3 is a diagram schematically illustrating an example of a method of transmitting a signal in a MIMO system to which unequal transmission power is applied.
FIG. 4 schematically shows a method for equalizing transmission power for each antenna in a MIMO system to which unequal transmission power is applied according to the present invention.
5 is a flowchart schematically illustrating a method of transmitting a signal using a non-uniform transmission power in a transmitter of a MIMO system to which the present invention is applied.
6 is an OFDM transmission structure of a spatial multiplexing technique.
7 shows the proposed transmission system structure.
8 shows the detailed structure of the MUX block.
9 shows the detailed structure of MUXi.

The present invention relates to a MIMO system for improving reception performance by directly connecting a conventional spatial multiplexing (MIMO) system and a precoder in a mobile broadcast channel environment. The MIMO system includes a plurality of transmit antennas, In which the transmission power output from each antenna has the same value.

In order to prevent performance deterioration due to correlation between the transmitting and receiving antennas, the MIMO method can be applied in a correlated fading channel environment.

 For example, in the case of 2x2 MIMO, when not only the same modulation is applied to two transmission antennas but also different modulation is applied to two transmission antennas, for example, quadrature phase-shift keying (QPSK) is applied to one antenna, When 16QAM (Quadrature Amplitude Modulation) is applied to the antenna, the same method as in FIG. 1 can be applied.

의 송신 신호들인

과

에는 서로 다른 송신 전력이 할당된다. 이때, 두 안테나의 전체 송신 전력은 항상 일정하다. 두 송신 신호

과

는

에 의해

로 프리코딩된 후 각 송신 안테나(120)를 통해서 전송된다.

는 프리코딩 행렬을 의미한다. 1 shows a schematic configuration of a MIMO system to which unequal transmission power is applied. Input signal vector

Which are transmission signals

and

Different transmission power is allocated. At this time, the total transmission power of the two antennas is always constant. Two transmission signals

and

The

By

Coded and then transmitted through the respective transmit antennas 120. [

Denotes a precoding matrix.

는 채널 행렬 H에 의해 수식 1과 같이 표현될 수 있다. The reception signal received by the reception antenna 130

Can be expressed as Equation (1) by the channel matrix H.

[Equation 1]

The received signal is demodulated by the MIMO decoder 140.

If different powers are used for different signals as in the case of FIG. 1, a correlation is generated between two precoded signals r1 and r2. If there is a correlation between the output signals and cross-correlation occurs between the channel values, the SNR (Signal to Noise Ratio) of the signal received by the reception antenna due to the transmission beam forming phenomenon is . Thus, the reception performance is improved.

According to this method, when the correlation between the transmission signals is large, the reception performance is improved, but different transmission power is used between the transmission signals. That is, transmission powers of the transmission antennas constituting the multi-antenna system are different from each other. Therefore, when the transmission signals are input to an HPA (High Power Amplifier) having the same characteristics, the transmission powers to the output signals of the amplifiers are also different from each other.

According to the present invention, in the case of such Unequal Transmission Power (MIMO) transmission, the reception range for the transmission signal is set to be the same So that the transmission efficiency can be increased.

2 schematically illustrates a MIMO system to which unequal transmission power is applied. 2, a MIMO system having a 2x2 structure will be described as an example.

Referring to FIG. 2, different transmission powers a and 1-a are applied to the transmission signals x1 and x2. The signals r1 and r2 passed through the precoder 210 are converted from serial transmission signals to parallel transmission signals through a serial-to-parallel converter 220. [ The transmission signal converted into the parallel transmission signal is input to the amplifiers 230 and 240, amplified, and then transmitted through the antennas 250 and 260.

At this time, since the transmission powers allocated to the transmission signals x1 and x2 are different from each other, the powers to r1 and r2 through the precoder 210 also become different from each other. As a result, the powers of the signals finally outputted through the amplifiers 230 and 240 having the same characteristics are different from each other, and accordingly, the reception ranges for the signals are different from each other.

Hereinafter, signals transmitted in time for each transmission antenna will be described in detail. In the 2x2 MIMO system, signals transmitted to the respective transmission antennas (antenna 1 and antenna 2) are shown in the following equations.

&Quot; (2) "

... ... ... ...

Here, if the (average) transmission power for the transmission signals of the two transmission antennas ant1 and ant2 can be the same, the reception range for the transmission signal can be the same.

An example of a transmission method based on unequal transmission power MIMO will be described in detail. 3 is a diagram schematically illustrating an example of a method of transmitting a signal in a MIMO system to which unequal transmission power is applied.

을 프리코딩하여 송신되는 신호인

을 얻을 수 있다.

은 서로 다른 송신 전력을 할당 받기 때문에 프리코딩된 신호

에 대한 송신 전력도 서로 다르게 된다. 따라서, 직렬-병렬 변환기(310)를 거쳐 동일한 특성의 증폭기(320, 330)를 거쳐 안테나(340, 350)로 전송되는 신호에 대한 수신 범위도 달라지게 된다.signal

Lt; RTI ID = 0.0 >

Can be obtained.

Lt; RTI ID = 0.0 > transmitted < / RTI >

Are different from each other. Therefore, the reception range of signals transmitted to the antennas 340 and 350 through the amplifiers 320 and 330 having the same characteristics through the S / P converter 310 is also changed.

In a MIMO system, transmission efficiency is improved by transmitting signals using spatial multiplexing. At this time, if the reception ranges of the signals are different from each other, the transmission efficiency of the system converges to a narrower depth range.

Therefore, in order to solve the problem that the reception range for the transmission signals is changed, a method of making the average power of the signals output from the amplifiers the same can be considered.

)가 할당되어 있으므로, 송신할 신호 r들도 한 신호씩 교차하여 서로 다른 송신 전력이 부여되게 된다.In the present invention, the signals to be transmitted to the amplifiers connected in a one-to-one manner to the antennas constituting the multiple antennas of the MIMO system are cross input, so that the average value of the transmission power for the signals transmitted for each antenna can be made equal. At this time, the unequal transmission power weight value (

), The signals r to be transmitted cross each other by one signal, and different transmission power is given.

The transmitted signals r are input to the respective amplifiers in an intersecting manner.

이 첫 번째 안테나에 연결된 증폭기에 입력되면,

은 두 번째 안테나에 연결된 증폭기에 입력되고, 이어서

는 다시 두 번째 안테나에 연결된 증폭기에 입력되며,

이 첫 번째 안테나에 연결된 증폭기에 입력된다. The signals input to each amplifier can be input to each amplifier at the input time. For example, in the case of a 2 X 2 MIMO system,

Is input to the amplifier connected to the first antenna,

Is input to the amplifier connected to the second antenna,

Is again input to the amplifier connected to the second antenna,

Is input to the amplifier connected to the first antenna.

부터

까지의 신호 중에서 홀수 번째 신호는 첫 번째 안테나에 연결된 증폭기에 입력하고, 짝수 번째 신호는 두 번째 안테나에 연결된 증폭기에 입력하며,

부터

까지의 신호 중에서 홀수 번째 신호는 두 번째 안테나에 연결된 증폭기에 입력하고, 짝수 번째 신호는 첫 번째 안테나에 연결된 증폭기에 입력하여 각 안테나로 전송되는 신호에 대한 평균 전송 전력을 동일하게 할 수 있다.Also, the signals input to the respective amplifiers may be input to the respective amplifiers at predetermined intervals. In this case, the predetermined period may follow the cycle of the largest frequency among the frequencies of the signals constituting the transmission signal. For example, when the period for the signal converted into the parallel transmission signal in the 2x2 MIMO system corresponds to n signals,

from

The odd-numbered signal is input to the amplifier connected to the first antenna, the even-numbered signal is input to the amplifier connected to the second antenna,

from

An odd number signal is inputted to an amplifier connected to a second antenna and an even number signal is inputted to an amplifier connected to a first antenna so that an average transmission power for signals transmitted to each antenna can be made equal.

Since the average transmission power of the signals transmitted to each antenna is the same, the reception range of each signal can be similarly adjusted.

FIG. 4 schematically shows a method for equalizing transmission power for each antenna in a MIMO system to which unequal transmission power is applied according to the present invention. In FIG. 4, a case where signals to be transmitted to the amplifiers connected to the respective antennas are cross input at the input time is described as an example of the present invention.

Referring to FIG. 4, the signals r through the serial-to-parallel converter 410 are input to the amplifiers 420 and 430 at every input time, and then transmitted through the antennas 440 and 450.

A signal input to each of the amplifiers connected in a one-to-one manner to each of the antennas constituting the multiple antennas is expressed by the input time. Equation 3 is the same as Equation 3 (n means an even number).

&Quot; (3) "

... ... ... ...

가 번갈아 가며 적용된 송신 신호 x가 프리코딩된 신호 r들이 입력된다. 두 번째 안테나(ant2)에 연결된 증폭기에 입력되는 신호도 송신 전력 가중치

가 번갈아 가며 적용된 송신 신호 x가 프리코딩된 신호 r들이 입력된다. 이때, 전체 매 시간 전송 전력을 일정하게 유지하기 위해서, 각 안테나별로 할당되는 전송 전력 가중치는 서로 상이하다.As can be seen from Equation (3), the signal input to the amplifier connected to the first antenna (ant1)

The transmission signals x applied with the applied pre-coded signals r are inputted alternately. The signal input to the amplifier connected to the second antenna < RTI ID = 0.0 > ant2 &

The transmission signals x applied with the applied pre-coded signals r are inputted alternately. In this case, the transmission power weights allocated to the respective antennas are different from each other in order to keep the transmission power constant for the entire time.

5 is a flowchart schematically illustrating a method of transmitting a signal using a non-uniform transmission power in a transmitter of a MIMO system to which the present invention is applied.

가 교차 부여된다(S510). 이 신호들은 프리코더에 순차적으로 입력된다.Referring to FIG. 5, a transmission power weight value

(S510). These signals are sequentially input to the precoder.

The precoder precodes the input signals to transmit signals in a spatial multiplexing manner through a multi-antenna system (S520).

The precoded signals are converted from a serial transmission signal to a parallel transmission signal by a serial-to-parallel converter (S530).

The signal converted into the parallel transmission signal is input to the amplifier (S540). The amplifiers are connected one to one to the respective antennas constituting the multiple antennas. The parallel transmission signals are input to each amplifier one by one. At this time, the parallel transmission signals may be input at every input time or may be input at predetermined intervals.

The input signal is amplified by the amplifier (S550). Thereafter, the signals are transmitted through multiple antennas (S560).

Of the contents described in the present specification, a job performed in a communication network may be performed in a process of controlling a network and transmitting data in a system (e.g., a server) managing the communication network, Lt; / RTI >

6 shows a spatial multiplexing scheme using two transmit antennas and a concatenated system of OFDM modulation in a wireless communication environment.

는 전송하고자 하는 크기 2N의 송신 신호 벡터이며, 여기에서

,

,

는 각각 평균 전력,

,

의 신호 성상

과

를 갖는다. 기존의 공간 다중화 기법은 먼저 도 6과 같이 송신 신호 벡터

를 2개의 서브 신호 벡터

,

로 분리한 후 각각 IFFT(Inverse Fast Fourier Transform) 크기 N의 OFDM 방식으로 각 송신 안테나로 전송,

,

하게 된다. 따라서, 각 송신 안테나 전송 신호의 평균 전력을 계산하면,

이며 PARP값은

,

이다. 6,

Is a transmission signal vector of size 2N to be transmitted,

,

,

Respectively,

,

Signal Properties

and

. In the conventional spatial multiplexing scheme, as shown in FIG. 6,

Into two sub-signal vectors

,

And transmitted to each transmission antenna by an OFDM method of IFFT (Inverse Fast Fourier Transform) size N,

,

. Therefore, by calculating the average power of each transmission antenna transmission signal,

And the PARP value is

,

to be.

와

가 동일한 신호 성상(

=

,

)을 갖는다면 최종 송신 안테나로 전송된 신호 y1 과 y2 는 동일한 평균 전력 값과 PAPR 값을 가지게 된다. 하지만 만약

와

가 서로 다른 평균 전력(

)의 서로 다른 성상(

)을 갖는다면 필히 y1 과 y2 는 서로 다른 평균 전력 값(

)을 가지게 되고 더불어 서로 다른 PAPR 값(

)을 가지게 되며 이럴 경우 후단의 HPA(High Power Amplifier)에 성능적인 문제를 일으켜 수신 성능의 열화를 발생시킬 수 있다.If the two transmission signals in FIG. 6

Wow

Have the same signal constellation (

=

,

), The signals y1 and y2 transmitted to the final transmission antenna have the same average power value and the same PAPR value. But if

Wow

Different average power (

) Of different characteristics (

Y1 and y2 must have different average power values

) And have different PAPR values (

In this case, performance problems may occur in the HPA (High Power Amplifier) at the rear end, which may cause deterioration of reception performance.

만을 전송하고 두 번째 송신 안테나에는

만을 전송하게 되면 송수신 안테나들의 비대칭 특성에 따라 수신 성능이 달라지는 문제점이 발생하게 된다. 특히 시스템 성능이 어떠한 채널 환경에 따라서 일정한 성능을 보장해야 하는 목적을 고려하면 위와 같은 현상은 바람직하지 않을 것이다.Also, if the channel characteristics of the transmitting and receiving antennas are asymmetric, as shown in FIG. 6,

And the second transmission antenna transmits

The receiving performance varies depending on the asymmetric characteristics of the transmitting and receiving antennas. Particularly, considering the purpose of ensuring a certain performance of system performance depending on a certain channel environment, the above phenomenon is not preferable.

For these reasons, a spatial multiplexing system that transmits signals of different constellations and a transmission scheme capable of solving the problem of non-uniformity of the above-mentioned OFDM signals and the uneven reception performance due to the asymmetry between transmitting and receiving antennas when OFDM is combined .

를 크기 N인 두개의 서브 신호 벡터

과

로 나눈다. 다음으로 제안된 구조는 도 6과 같이

과

를 각 송신 안테나로 직접 전송하지 않고 도 7과 같이

를 이용한 MUX 블럭을 통하여 크기가 N인 새로운 두 서브 신호 벡터

를 발생하여 OFDM을 통하여 최종 각 송신 안테나로 전송한다. 이 MUX 블록의 세부 구조는 아래 도면 8, 9와 같다.
The basic structure of the present invention is shown in Fig. First, as shown in FIG. 6,

Into two sub-signal vectors of size N

and

. Next, the proposed structure is shown in FIG. 6

and

As shown in Figure 7,

A new sub-signal vector having a size of N

And transmits them to the final transmit antennas through OFDM. The detailed structure of this MUX block is shown in FIGS. 8 and 9 below.

과

내 신호들을 서로 순차적으로 묶어 총 N 개의 신호쌍

을 발생한다. 이렇게 발생된 각 신호 쌍

은 도면 9와 같이

의 값에 따라 아래 수학식 4와 같이 총 N개의 새로운 신호쌍 이 발생된다. The detailed operations of Figs. 8 and 9 are as follows. First,

and

And sequentially grouping the signals into a total of N signal pairs

. Each signal pair

As shown in FIG. 9

A total of N new signal pairs are generated as shown in Equation (4) below.

&Quot; (4) "

이면,

과

는 도 6의 기존의 방법으로 첫번째, 두번째 송신 안테나로 각각 전송되고

이면 순서가 뒤바뀌어 두 번째, 천번째 송신 안테나로 각각 전송되게 된다. 특히 본 제안된 구조에서는

제약 조건을 두어 총

개들 중 언제나 절반은 서로 위치가 바뀌도록 하였다. As a result, the OFDM transmission structure of Equation (4)

If so,

and

Are respectively transmitted to the first and second transmission antennas in the conventional method of FIG. 6

The order is reversed and the second and the thousandth transmission antennas are respectively transmitted. In particular, in the proposed structure

Total number of constraints

Half of the dogs always had their positions changed.

일 경우

이고

일 경우

이면 각 송신 안테나로 전송되는 최종 OFDM 신호는 아래의 수학식 5와 같다 .As an example,

If

ego

If

The final OFDM signal transmitted to each transmission antenna is expressed by Equation (5) below.

&Quot; (5) "

일 경우

이고

일 경우

이면 각 송신 안테나로 전송되는 최종 OFDM 신호는 아래의 수학식 6과 같다. Also if

If

ego

If

, The final OFDM signal transmitted to each transmission antenna is expressed by Equation (6) below.

&Quot; (6) "

을 이용하면 도 7내 두 OFDM 송신 신호

과

에는 기존의 도 6과 다르게 언제나 총 N/2개의

성상 구조의

과

성상 구조의

를 동시에 포함하게 되며 따라서

과

는 동일한 평균 전력 값,

과 PAPR값,

를 가지게 된다. Such a MUX condition

Lt; RTI ID = 0.0 > OFDM < / RTI &

and

Unlike the conventional FIG. 6, there are always a total of N / 2

Constellation

and

Constellation

Lt; RTI ID = 0.0 >

and

The same average power value,

And the PAPR value,

.

성상 구조의

신호만 전송되었는데 새로이 제안된 도 7의 구조는 두 송신 안테나 모두 절반의

성상 구조의

신호와

성상 구조의

신호들이 동시에 전송되어 수신 성능은 특정 성상 구조에 영향을 받지 않고 평균 성능을 보여 주게 된다.In addition, when the transmission and reception antennas are asymmetric to each other, only the signal of the constellation structure is transmitted to the first transmission antenna in the structure of FIG. 6,

Constellation

Signal is transmitted, but the newly proposed structure of FIG. 7 shows that both transmission antennas have half

Constellation

Signal and

Constellation

Signals are transmitted at the same time, and reception performance shows average performance without being influenced by specific constellation structure.

)에서 0과 1의 개수를 다르게 함으로써 구현될 수 있다.In the present invention, even when the ratio of two transmission symbol streams crossing two antennas is not the same,

) By changing the number of 0's and 1's.

In addition, the description of "including" a specific configuration in the present invention does not exclude a configuration other than the configuration, and means that additional configurations can be included in the practice of the present invention or the technical scope of the present invention.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims (8)

As a spatial multiplexing transmission method using multiple antennas,
Crossing different transmission power weights on sequential transmission broadcast signals;
Precoding a sequential transmission broadcast signal to which the transmission power weight is assigned;
Converting the precoded sequential transmission broadcast signal into a parallel transmission broadcast signal;
A step of cross-inputting the parallel broadcast signals to a first amplifier connected to a first antenna constituting multiple antennas and a second amplifier connected to a second antenna constituting the multiple antennas; And
Broadcasting the inputted parallel broadcast transmission signal through the multiple antennas,
Wherein the first amplifier and the second amplifier have the same amplification characteristics,
The step of cross-inputting the parallel broadcast signals comprises:
And an average transmission power of the parallel broadcast transmission signal transmitted to the first amplifier connected to the first antenna and a second transmission power of the parallel broadcast transmission signal transmitted to the second amplifier connected to the second antenna in consideration of the transmission power weight applied to the sequential transmission broadcast signal, Wherein the cross input of the parallel broadcast signal is controlled so that the average transmit power of the parallel broadcast signal is set to be the same. 2. The method of claim 1, wherein the parallel transmission broadcast signal is input to the first amplifier and the second amplifier at each input time. The method as claimed in claim 1, wherein the parallel transmission broadcasting signal is input to the first amplifier and the second amplifier at predetermined intervals. 4. The method of claim 3, wherein the predetermined period is a cycle of a signal having the highest frequency among the signals constituting the parallel transmission broadcasting signal. A precoder for precoding an input sequential broadcast signal;
A serial-to-parallel converter for converting the precoded sequential transmission broadcast signal into a parallel transmission broadcast signal;
An amplifying unit for amplifying the parallel transmission broadcasting signal; And
And a multi-antenna unit for broadcasting the amplified parallel broadcast signal,
Wherein the amplifying unit includes a plurality of amplifiers connected in one-to-one relation to the respective antennas constituting the multiple antenna unit,
Different transmission power weights are assigned to the sequential transmission broadcast signals input to the precoder,
Wherein the serial-to-parallel converter cross-inputs the converted parallel broadcast signals to the plurality of amplifiers, and transmits the converted parallel broadcast signals to a plurality of amplifiers connected to the different antennas in consideration of the transmit power weights given to the sequential broadcast signals Wherein the control unit controls an intersection input of the parallel transmission broadcasting signal by setting an average transmission power of the parallel transmission transmission signal to be equal,
Wherein the plurality of amplifiers have the same amplification characteristic. 6. The apparatus of claim 5, wherein the serial-to-parallel converter cross-inputs the parallel broadcast signals at the input time to the plurality of amplifiers. 6. The apparatus of claim 5, wherein the serial-to-parallel converter cross-inputs the parallel broadcast signals at predetermined intervals to the plurality of amplifiers. [8] The method of claim 7, wherein the predetermined period in which the parallel transmission broadcasting signals are input to the plurality of amplifiers is a period of a signal having the highest frequency among the signals constituting the parallel transmission broadcasting signal. Device.

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