KR101100116B1 - Apparatus for transmiter processing precoding using the number of transmiter antenna in open loop communication system and method for the same - Google Patents

Abstract

In order to achieve the above object, a transmission device according to an aspect of the present invention is a transmission device included in a multi-pump (MIMO; Multipul Input Multipul Output) communication system having a plurality of antennas, and outputs data by parallelizing the input data. A precoder for precoding the parallelized data according to the number of antennas through a serial-to-parallel conversion unit, a precoding matrix set based on the number of antennas included in the system, and the system And a STBC encoder for outputting a signal to be output through an antenna included in the space time block coding (STBC).

Description

TECHNICAL FIELD OF THE INVENTION A transmission apparatus and method for an open loop communication system performing precoding by using the number of transmission antennas {APPARATUS FOR TRANSMITER PROCESSING PRECODING USING THE NUMBER OF TRANSMITER ANTENNA IN OPEN LOOP COMMUNICATION SYSTEM AND METHOD FOR THE SAME}

The present invention relates to an open loop multi-antenna system, and more particularly, to a precoding device and method for an open-loop multi-antenna transmission apparatus.

Current wireless mobile communication systems are actively being implemented or researched for the purpose of multimedia services of high quality, high speed, and large data transmission. Unlike the wired channel environment, the wireless channel environment exists in such a wireless mobile communication system due to various factors such as multipath interference, shadowing, attenuation of radio waves, and time-varying noise and interference. A signal distorted in the transmission signal is received. Here, the fading due to the multipath interference is closely related to the mobility of the reflector or the user, that is, the user terminal, and is received in a form in which the actual transmission signal and the interference signal are mixed. Thus, the received signal becomes a form that is severely distorted in the actual transmission signal to act as a factor that degrades the performance of the entire mobile communication system. As a result, the fading phenomenon may distort the amplitude and phase of the received signal, which is a major cause of disturbing high-speed data communication in a wireless channel environment, and many studies have been conducted to solve the fading phenomenon. It is becoming. As a result, in order to transmit data at a high speed in a mobile communication system, loss due to characteristics of a mobile communication channel such as fading and user-specific interference should be minimized. One technique proposed to solve this problem is a multiple-input multiple-output (hereinafter referred to as 'MIMO') technique.

The MIMO technology can be largely classified as follows according to a data transmission method and whether channel information feedback is performed.

First, there are Spatial Multiplexing (SM) and Spatial Diversity (SD). The SM technique is a technique that can transmit data at a higher speed without increasing the bandwidth of the system by simultaneously transmitting different data using multiple antennas at the transmitter and the receiver. In contrast, the SD scheme is a technique for obtaining transmit diversity by transmitting the same data in multiple transmit antennas.

The above techniques are further classified into an open loop and a closed loop according to whether channel information is feedback at the receiving end. The open loop method is a method in which the receiver does not receive the channel information and has a relatively small amount of calculation compared to the closed loop method in which all channel values of the receiver are fed back to the transmitter. However, the open-loop scheme has a problem in that diversity gain and transmission rate or decoding complexity exhibit characteristics that are incompatible with each other. In other words, if the diversity gain is set to the maximum, a problem arises in that the transmission rate and decoding complexity decreases. If the transmission rate and the decoding complexity is set in the maximum, the diversity gain decreases. To compensate for this drawback, the diversity gain and decoding complexity are somewhat reduced, but the quasi-Orthogonal Space Time Block Code (hereinafter referred to as 'QO-STBC') which provides the maximum data rate is used. In addition, various attempts have been made to increase the diversity gain in the QO-STBC scheme.

The present invention has been made in consideration of the foregoing, and is a transmission apparatus capable of implementing maximum diversity gain and decoding complexity reduction through precoding using the number of antennas. And to provide a method.

Another object of the present invention is to provide a transmission apparatus and a method capable of realizing channel orthogonality without channel state information in a real domain.

Another object of the present invention is to provide a transmission apparatus and a method capable of using multi-dimensional rotation by removing a correlation caused by orthogonality of a channel.

In order to achieve the above object, a transmission device according to an aspect of the present invention is a transmission device included in a multi-pump (MIMO; Multipul Input Multipul Output) communication system having a plurality of antennas, and outputs data by parallelizing the input data. A precoder for precoding the parallelized data according to the number of antennas through a serial-to-parallel conversion unit, a precoding matrix set based on the number of antennas included in the system, and the system And a STBC encoder for outputting a signal to be output through an antenna included in the space time block coding (STBC).

According to another aspect of the present invention, there is provided a method of transmitting data in a multiple antenna (MIMO) communication system having a plurality of antennas, the method comprising: parallelizing and outputting input data; Precoding the parallelized data according to the number of antennas through a precoding matrix set based on the number of antennas included, and space-time block coding of a signal to be output through an antenna included in the system. STBC; Space Time Block Coding).

According to the present invention, the following effects can be created through precoding using the number of antennas.

First, maximum diversity gain and decoding complexity reduction can be implemented.

Second, the channel orthogonality can be implemented in the real domain without channel state information.

Third, multi-dimensional rotation can be used by removing the correlation caused by the orthogonality of the channel.

1 is a block diagram showing the configuration of a transmitting apparatus according to an embodiment of the present invention;
2 is an exemplary diagram of a precoder provided in a transmitting apparatus according to an embodiment of the present invention;
3 is another exemplary diagram of a precoder provided in a transmitting apparatus according to an embodiment of the present invention;
4 is a flowchart illustrating a procedure of a signal transmission method according to an embodiment of the present invention;
5 is a graph showing results of experiments on bit error rate of a signal transmitted by a transmission method according to an embodiment of the present invention;
6 is a graph of results of experimenting with a frame error rate of a signal transmitted by a transmission method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to help a more general understanding of the present invention, and it is common knowledge in the art that such specific matters may be changed or modified within the scope of the present invention. It is self-evident to those who have.

The present invention can be applied to a communication system designed to implement a multiple input multiple output (MIMO) technology, the number of antennas in the present invention is the number of antennas provided in the transmission device of the communication system.

1 is a block diagram showing the configuration of a transmitter according to an embodiment of the present invention. Referring to FIG. 1, a transmitter according to an exemplary embodiment of the present invention uses a parallel / parallel converter 110 to process a signal to be transmitted to a receiver as a parallel signal, using the precoding matrix considering the number of transmit antennas. A precoder 120 for precoding the signal, an STBC encoder 130 for quasi-Orthogonal Space Time Block Code (QO-STBC), and a quasi-orthogonal space time block code A plurality of transmit diversity antennas (140-1, 140-2, 140-3, 140-n) for transmitting orthogonal space-time block coded signal (hereinafter referred to as 'transmission antenna').

The precoder 120 receives the number of antennas included in a communication system and checks a precoding matrix according to the number of antennas. The parallel signal is applied to the precoding matrix to output a signal for QO-STBC processing.

The precoding matrix according to the number of antennas can be confirmed through the following operation.

)는 K개의 임이의 복합 성상도 심볼들로 구성되는 T×N_t 행렬로 나타낼 수 있으며, STBC 부호율(code rate)(R_s)은 K/T로 정의할 수 있다. 이에 기초하여, 시스템 모델은 하기의 수학식 1과 같이 정의할 수 있다.In the present invention, the STBC codeword is transmitted from the N _t transmit antennas to the N _r receive antennas during the period of the T symbol period. In addition, a block fading channel may exist in an environment in which a channel is recognized by a receiving device but not a transmitting device, and a fading coefficient is fixed to a block of transmission symbols and is independent of blocks. have. Also, the transmission codeword (

) May be represented by a T × N _t matrix consisting of K arbitrary constellation symbols, and STBC code rate R _s may be defined as K / T. Based on this, the system model may be defined as in Equation 1 below.

,

이다.

는 i번째 전송 안테나로부터 단위면적당 0.5의 값을 갖는 독립 복합 가우시안 랜덤 변수(independent complex Gaussian random variables)의 샘플로 샘플링되는 수신 안테나로의 경로 이득을 지시하고,

는 i번째 시간에 분산

를 갖는 독립 이상 분산 복합 가우시안 노이즈(independent and identicallydistributed (i.i.d) complex Gaussian noise)를 지시한다.here,

,

to be.

Denotes a path gain from the i th transmit antenna to a receive antenna sampled as a sample of independent complex Gaussian random variables having a value of 0.5 per unit area,

Distributed at the i time

Independent and identically distributed (iid) complex Gaussian noise.

를 실수부 및 허수부로 분해하면, 실수 채널 행렬(

)은 하기의 수학식 2와 같이 나타낼 수 있다.Receive signal vector

If you decompose into real and imaginary parts, the real channel matrix (

) Can be expressed as in Equation 2 below.

, X=

, 및 n=

이다. 그리고, H_Nt의 k번째 컬럼은 h_k(k=1, 2, ..., 2N_t)로 나타낼 수 있다. 예컨대, N_t=4일때, 준직교 코드 행렬은 하기의 수학식 3과 같이 예시할 수 있고, 이에 대응하는 실제 채널 행렬은 수학식 4와 같이 예시할 수 있다.Where y =

, X =

, And n =

to be. The kth column of H _Nt may be represented by h _k (k = 1, 2, ..., 2N _t ). For example, when N _t = 4, the quasi-orthogonal code matrix may be illustrated as Equation 3 below, and the actual channel matrix corresponding thereto may be illustrated as Equation 4.

Furthermore, the two-dimensional real signal vector X may be expressed as Equation 5 below.

Where X _i1 = [x ₁ , I ... x _n , I] ^T , X _i2 = [x _{n +1} , I ... x _2n , I] ^T , X _q1 = [x ₁ , Q .. .x _n , Q] ^T , X _q2 = [x _{n + 1} , Q ... x _2n , Q] ^T and n = N _t / 2.

Pairs of column vectors {h ₁ h ₂ }, {h ₃ h ₄ }, {h ₅ h ₆ }, {h ₇ h ₈ }) consists of an orthogonal subset, meaning that the maximum likelihood Maximum-likehood (ML) decoding can be performed independently through X _i1 , X _i2 , X _q1 , and X _q2 .

From this point of view, the code matrix when N _t = 8 can be expressed by Equation 6 below.

In this case, the corresponding channel matrix H ₈ is divided into four orthogonal column subsets: {h ₁ ... h ₄ }, {h ₅ ... h ₈ }, {h ₉ ... h ₁₂ }, And {h _{13 ...} h ₁₆ }.

On the other hand, the precoder 120 of the present invention performs the precoding process through the operation of the equation (7).

Here, s is a transmission data vector, and P indicates a channel orthogonal precoder having a size of 2N _t × 2N _t .

In the present invention, P is an integrated single matrix and tr (P ^T P) = 2N _t since E [s ^T s] = P _t including the transmission power constant E [x ^T x] = P _t .

Combining the above Equations 2 and 7 can be expressed as shown in Equation 8 below.

)는 하기의 수학식 9와 같이 나타낼 수 있고, 전송 데이터 벡터(s) 및 채널 직교 프리코더(P)는 하기의 수학식 10과 같이 나타낼 수 있다.Where channel matrix (

) Can be expressed as Equation 9 below, and the transmission data vector s and the channel orthogonal precoder P can be expressed as Equation 10 below.

는 n×n 크기의 프리코딩 서브 매트릭스이다. Where s _i1 = [s ₁ , I ... s _n , I] ^T , s _i2 = [s _{n +1} , I ... s _2n , I] ^T , s _q1 = [s ₁ , Q .. .s _n , Q] ^T , s _q2 = [s _{n + 1} , Q ... s _2n , Q] ^T ,

Is an n × n sized precoding sub-matrix.

Meanwhile, the precoding matrix P may be configured using an n-dimensional rotation constellation, and the multi-dimensional rotation constellation is based on a minimum product distance (MPD) represented by Equation 11 below. It is composed.

)은 컬럼 기준이 이상적으로 분산되고 상관되지 않는 컬럼 와이즈 직교 채널 행렬(column-wise orthogonal channel matrix)로 분해된다. 이에 따라, 본 발명에 구비된 프리코더(120)는 채널 행렬(

)의 컬럼들 사이의 상관을 제거하고, 구성들을 인터리브(Interleave) 한다.Orthogonal precoding matrices are channel matrices (

) Are decomposed into a column-wise orthogonal channel matrix where the column reference is ideally distributed and uncorrelated. Accordingly, the precoder 120 provided in the present invention is a channel matrix (

Remove correlation between columns and interleave configurations.

)은

로 정의된다. 나아가, 4개의 안테나를 지원하는 QO-STBC를 위한 부호어 차 행렬은 하기의 수학식 12와 같이 나타낼 수 있다.In addition, the precoder 120 provided in the present invention considers the determinant design criteria to ensure the orthogonality of the channel. Codeword diffrence matrix (

)silver

Is defined as Furthermore, the codeword difference matrix for the QO-STBC supporting four antennas may be expressed as in Equation 12 below.

조건에서의 디터미넌트 값은 하기의 수학식 13과 같이 나타낼 수 있다.And,

The determinant value in the condition may be expressed by Equation 13 below.

,

이다.here,

,

to be.

Furthermore, in order to achieve the maximum coding gain, by setting the determinant matrix equal to the minimum value of the distance product of Equation 11 as shown in Equation 14, the precoding satisfying the maximum coding gain as shown in Equations 15 and 16 is shown. Can compute matrices

이고,

이고, C_p는 수학식 7에서의 전력 상수값으로부터 정의되는 값으로써, 예컨대 2로 설정될 수 있다. 그리고, 상기 수학식 14로부터

와

의 관계식을 도출할 수 있다.here,

ego,

And C _p is a value defined from the power constant value in Equation 7, and may be set to, for example, 2. And, from the equation (14)

Wow

Can be derived.

On the other hand, a precoding matrix can be expressed from Equation 7 and Equation 10 as shown in Equation 15 below, and the precoding matrix when the number of antennas is four is represented by Equation 14 below. It can be formed as follows.

Furthermore, when the number of antennas N _t is eight, as in the case where the number of antennas N _t is four, the precoding matrix may be calculated by setting the determinant matrix to be equal to the minimum value of the distance product.

In the case where the number of antennas N _t is 8, the determinant matrix is expressed by Equation 17 below, and the operation of Equation 18 is performed to set the determinant matrix to be equal to the minimum value of the distance product. Finally, as shown in Equation 19, a precoding matrix having 8 antenna numbers N _t may be calculated.

,

,

, 및

이다.here,

,

,

, And

to be.

,

,

, 및

이고, C_p는 4로 설정될 수 있다. here,

,

,

, And

And C _p may be set to four.

Although, in one embodiment of the present invention, the precoder 120 exemplifies the processing of the precoding matrix operation in the case where the antenna number N _t is 4 and 8, the present invention is not limited thereto. For example, the number of antennas N _t may be variously changed, and the minimum value of the determinant matrix and the distance product corresponding thereto may also be changed according to the number of antennas N _t .

Furthermore, the precoding matrix of the precoder 120 according to an embodiment of the present invention may be set by the user according to the number of antennas N _t when designing, constructing, or changing a communication system.

In addition, the precoder 120 according to an embodiment of the present invention receives the number of transmit antennas N _t provided in the communication system, and the precoder 120 directly precodes the antenna number N _t . It is also possible to compute the precoding matrix for.

2 is a diagram illustrating a precoder provided in a transmitting apparatus according to an embodiment of the present invention. Referring to FIG. 2, the precoder 120 included in the transmission apparatus according to an embodiment of the present invention receives a number of antennas N _t , and a precoding matrix calculator 221 for calculating a precoding matrix and the above. A precoding processor 223 performs a precoding process on the parallel signals according to the precoding matrix. In particular, the precoding matrix calculation unit 221 checks the minimum value of the predetermined determinant matrix and the distance product according to the number of antennas N _t based on the above-described algorithm of the precoding matrix, and the determinant The precoding matrix can be arithmetic by setting the same minimum value of the matrix and the distance product.

3 is another exemplary diagram of a precoder provided in a transmitting apparatus according to an embodiment of the present invention. Referring to FIG. 3, the precoder 120 according to another embodiment may include at least two precodings implemented to process a predetermined precoding matrix according to the number of antennas N _t with respect to the input parallel signal. Matrix processing units 321-1, 321-2, 321-3, ... 321-n. For example, the first precoding matrix processor 321-1 processes a predetermined precoding matrix (that is, the precoding matrix illustrated in Equation 16 above) when the number of antennas N _t is four, and The two precoding matrix processing unit 321-2 processes a predetermined precoding matrix (that is, the precoding matrix illustrated in Equation 19 above) when the number of antennas N _t is eight, and the third precoding is performed. The matrix processor 321-3 processes a predetermined precoding matrix when the number of antennas N _t is 16, and the nth precoding matrix processor 321-n when the number of antennas N _t is n. Processes a predetermined precoding matrix of. In addition, the precoder 120 according to another embodiment includes a precoding matrix selector 323. The precoding matrix processor 323 receives the number of transmit antennas N _t provided in the communication system. Precoding for processing a predetermined precoding matrix corresponding to the number of transmit antennas N _t among at least two precoding matrix processing units 321-1, 321-2, 321-3,. A matrix processing unit is selected, and a signal indicating an operation of precoding matrix processing is transmitted to the selected precoding matrix processing unit. For example, when the precoding matrix selector 323 receives that the number of transmit antennas N _{t included} in the communication system is eight, the precoding matrix selector 323 pre-prescribes eight transmit antennas N _t . A second precoding matrix processor 321-2 for processing a coding matrix is selected, and a signal instructing an operation of precoding matrix processing is transmitted to the second precoding matrix processor 321-2.

4 is a flowchart illustrating a procedure of a signal transmission method according to an embodiment of the present invention. Referring to FIG. 4, a signal transmission method according to an embodiment of the present invention includes steps 411 and 413 for setting an environment of a transmission device and steps 421 to 429 for processing and transmitting a signal to be transmitted before transmitting a signal. It includes.

First, in step 411, the number of transmit diversity antennas (hereinafter, referred to as transmit antennas) required for the precoding process is received in the present invention. The number of antennas may be input when designing, building, or modifying a communication system.

와

의 관계식을 도출할 수 있고, 수학식 15 및 수학식 16과 같이 최대 부호화 이득을 만족하는 프리코딩 행렬을 연산할 수 있다. 또한, 안테나 개수(N_t)가 8개인 경우, 안테나 개수(N_t)가 4개인 경우와 마찬가지로, 디터미넌트 행렬을 상기 거리곱의 최소값과 동일하게 설정함으로써 프리코딩 행렬을 연산할 수 있다. 즉, 안테나의 수(N_t)가 8개인 경우의 디터미넌트 행렬은 하기의 수학식 17과 같으며, 디터미넌트 행렬을 상기 거리곱의 최소값과 동일하게 설정하기 위하여 수학식 18의 연산을 수행하고, 최종적으로 수학식 19와 같이 안테나 개수(N_t)가 8개인 프리코딩 행렬을 연산할 수 있다. 나아가, 안테나 개수(N_t)가 다양하게 변경되더라도, 변경된 안테나 개수에 따른 디터미넌트 행렬과 상기 거리곱의 최소값을 확인하고, 상기 디터미넌트 행렬을 상기 거리곱의 최소값과 동일하게 설정함으로써, 프리코딩 행렬을 연산할 수 있다.Next, in step 413, a precoding matrix is set. The precoding matrix is set based on the number of antennas. Specifically, in consideration of the relationship between the determinant matrix and the minimum value of the distance product, as in the precoding matrix setting algorithm of the precoder (120 of FIG. 1) included in the transmitter according to the above-described embodiment of the present invention The precoding matrix according to the number of antennas N _t can be set. In order to achieve the maximum coding gain, for example, when the number of antennas N _t is four, by setting the determinant matrix to be equal to the minimum value of the distance product of Equation 11 as shown in Equation 14,

Wow

Can be derived and a precoding matrix that satisfies the maximum coding gain can be calculated as in Equations 15 and 16. In addition, when the number of antennas N _t is eight, as in the case where the number of antennas N _t is four, the precoding matrix may be calculated by setting the determinant matrix to be equal to the minimum value of the distance product. That is, the determinant matrix in the case where the number of antennas N _t is 8 is expressed by Equation 17 below, and in order to set the determinant matrix equal to the minimum value of the distance product, Finally, as shown in Equation 19, a precoding matrix having 8 antenna numbers N _t may be calculated. Furthermore, even if the number of antennas N _t is varied, by checking the minimum value of the determinant matrix and the distance product according to the changed number of antennas, and setting the determinant matrix to be equal to the minimum value of the distance product, The precoding matrix can be computed.

In operation 421, when data or a signal transmitted through the communication system is input, in operation 423, serial-to-parallel conversion of the input signal is performed.

Next, in step 425, the precoding process on the blind signal is performed by the precoding matrix set in step 413.

In step 427, the pre-coded signal is quasi-orthogonal space time block code (QO-STBC), and in step 429, the encoded signal is referred to as a diversity antenna. Transmit to receiving device through.

Hereinafter, an experimental example of a signal transmitted by the transmission method according to an embodiment of the present invention. The demonstration illustrates the results measured through simulation in an uncoded system and a coded system. In the experimental example, it is assumed that QAM modulation with eight transmit antennas and one receive antenna is performed for the block fading channels for gray mapping.

5 is a graph of the results of experiments on the bit error rate of the signal transmitted by the transmission method according to an embodiment of the present invention, illustrating the results of the simulation for the uncoded system. Referring to FIG. 5, as Comparative Example 1-1, a simulation result of a bit error rate of a signal processed by a general Conventional STBC (Conventional STBC) method was confirmed. The simulation results of the bit error rate of the signal processed by QO ₈ with rotated constellation [5]) were confirmed, and as Comparative Example 1-3, it was processed by the multi-dimensional conventional rotated QO ₈ [6] method. The simulation result about the bit error rate of the signal was confirmed, and as the comparative example 1-4, the simulation result about the bit error rate of the signal processed by the MMRC with 9dB penalty method was confirmed. Then, it was confirmed the simulation results for the bit error rate of the signal processed by the pre-coding (QO ₈ with proposed precoding) having a multi-dimensional constellation according to the embodiment of the present invention.

QO-STBC (QO ₈ with rotated constellation [5]) method having the rotational constellation of Comparative Example 1-2 is described in the paper, "L. Xian and H. Liu," Rate-one space-time block codes with full diversity ", IEEE Transactions on Communications , vol. 53, pp. 1986-1990, December 2005. ", and the multidimensional constellation rotated QO ₈ [6] method of Comparative Example 1-3 is described in the paper," H. Lee, J. Cho, J.-K. Kim, and I. Lee, "Real-domain decoder for fullrate full-diversity STBC with multidimensional constellations", IEEE Transactions on Communications , vol. 57, pp. 17-21, January 2009. ".

The embodiment according to the present invention shows a bit error rate that is relatively smaller than the bit error rate of the signal processed by the general STBC (Conventional STBC) method of Comparative Example 1-1. In addition, the embodiment according to the present invention has no performance difference in the diversity order and the signal processed by the MMRC with 9dB penalty of Comparative Example 1-4. It can be seen that embodiments of the present invention can obtain full diversity. In addition, Comparative Examples 1-2 and 1-3 are techniques that are evaluated to be excellent in performance among the conventionally proposed techniques. It can be seen that the embodiment of the present invention can realize processing performance similar to conventional techniques such as Comparative Examples 1-2 and 1-3, that is, excellent processing performance.

FIG. 6 is a graph illustrating results of experiments on a frame error rate of a signal transmitted by a transmission method according to an embodiment of the present invention. FIG. 6 illustrates results of a simulation of a coded system. As Comparative Example 2-1, the simulation results of the frame error rate of the signal processed by the multi-dimensional convection phase rotated QO ₈ [6] method were confirmed. The simulation results of the frame error rate of the signal processed by the rotated QO ₈ [7]) method were confirmed. As Comparative Example 2-3, the signal processed by the MMRC with 9dB penalty method was compared. The simulation results for the frame error rate were confirmed. As an embodiment of the present invention, a simulation result of the frame error rate of a signal processed by a precoding scheme having a multidimensional constellation is confirmed.

The multidimensional constellation phase rotation (Conventional QO ₈ [6]) method of Comparative Example 2-1 is described in the paper, "H. Lee, J. Cho, J.-K. Kim, and I. Lee," Real-domain decoder for fullrate full-diversity STBC with multidimensional constellations ", IEEE Transactions on Communications , vol. 57, pp. 17-21, January 2009. "The improved multidimensional constellation phase rotation (Conventional QO ₈ [7]) method of Comparative Example 2-2 is described in the paper," N. Sharma and C. Papadias, "Improved quasi-orthogonal codes through constellation rotation", IEEE Transactions on Communications, vol. 51, pp. 332 `` 35, March 2003. ''

As in the experimental example of the bit rate error, the embodiment according to the present invention is used in the diversity order and the signal processed by the MMRC with 9dB penalty method of Comparative Example 2-3. There is no performance difference, and as a result, it can be seen that the embodiment of the present invention can obtain full diversity. In addition, the embodiment of the present invention exhibits a relatively lower frame error rate than Comparative Examples 2-1 and 2-2. Thus, it can be seen that the method according to the embodiment of the present invention has a relatively lower computational complexity than Comparative Examples 2-1 and 2-2, and can realize excellent processing capability.

As a result, the method according to the present invention can realize an excellent effect of obtaining full diversity while maintaining excellent processing performance in an uncoded system and a coded system.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and various modifications and changes may be made by those skilled in the art to which the present invention pertains.

Claims (10)

In the transmitting device included in an open-loop multiple antenna (MIMO) communication system having a plurality of antennas,
A serial-to-parallel converter for parallelizing and outputting input data;
A precoder for precoding the parallelized data according to the number of antennas through a precoding matrix set based on the number of antennas included in the system;
And an STBC encoder for outputting a signal to be output through an antenna included in the system, by space time block coding (STBC),
The precoder,
And a precoding matrix is calculated in consideration of the relationship between the maximum determinant value of the matrix and the minimum value of the distance product. The method of claim 1, wherein the precoder is
And receiving the number of antennas included in the system, calculating a precoding matrix corresponding to the number of antennas, and outputting the parallelized data to the precoding matrix. delete The method of claim 1, wherein the precoder is
A plurality of precoding matrix processing unit for processing a precoding matrix set in advance corresponding to the number of antennas,
And a precoding matrix selector configured to receive the number of antennas included in the system and to select a precoding matrix processor corresponding to the number of antennas from among the plurality of precoding matrix processors. The method of claim 4, wherein the plurality of precoding matrix processing unit,
And a precoding matrix corresponding to the number of antennas is preset in consideration of the relationship between the maximum determinant value of the matrix and the minimum value of the distance product. A method of transmitting data in an open-loop multiple antenna (MIMO) communication system having a plurality of antennas, the method comprising:
Outputting the data in parallel and
Precoding the parallelized data according to the number of antennas through a precoding matrix set based on the number of antennas included in the system;
And outputting a space time block coding (STBC) signal to be output through an antenna included in the system,
The process of calculating the precoding matrix,
And a precoding matrix is calculated in consideration of the relationship between the maximum determinant value of the matrix and the minimum value of the distance product. The method of claim 6, wherein the precoding process comprises:
Receiving a number of antennas included in the system and calculating a precoding matrix corresponding to the number of antennas;
And transmitting the parallelized data to the precoding matrix. delete The method of claim 6, wherein the precoding process comprises:
Receiving a number of antennas included in the system and selecting a precoding matrix processor corresponding to the number of antennas from among a plurality of precoding matrix processors which process a precoding matrix preset according to the number of antennas. Transmission method characterized in that. The method of claim 9, wherein the plurality of precoding matrix processing unit,
And a precoding matrix corresponding to the number of antennas is preset in consideration of the relationship between the maximum determinant value of the matrix and the minimum value of the distance product.

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