KR20060055269A - Multiple antenna system employing repeat request error correcting apparatus and method - Google Patents

Abstract

The present invention relates to error correction in a communication system using a plurality of antennas. Specifically, when a retransmission request occurs due to error detection, the data is adapted to meet the retransmission request using antenna diversity according to an improved rule. A transmitter and a transmission method of a multi-antenna communication system including a retransmission request error correction apparatus and a method capable of transmitting without error are proposed.

Antenna diversity gain, retransmission request, error correction

Description

MULTIPLE ANTENNA SYSTEM EMPLOYING REPEAT REQUEST ERROR CORRECTING APPARATUS AND METHOD}             

1 (a) is a diagram showing a data transmission method in a transmitter using a SW transmission retransmission request error correction method.

1 (b) is a view showing a data transmission method in a transmitter using a retransmission request error correction method of the GBN method.

1 (c) is a diagram showing a data transmission method in a transmitter using an SR transmission retransmission request error correction method;

2 is a diagram illustrating a transmitter configuration of a multi-antenna communication system using a retransmission request error correction method.

3 is a diagram illustrating a receiver configuration of a multi-antenna communication system using a retransmission request error correction method.

4 is a flowchart illustrating a process of a data transmission method of a multi-antenna communication system using a retransmission request error correction method according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to error correction in a communication system using a plurality of antennas. Specifically, antenna diversity is used according to an improved rule (permutation transmission mode) when data is retransmitted due to error detection. The present invention proposes a transmitter and a transmission method of a multi-antenna communication system including a retransmission request error correction apparatus and a method capable of transmitting without error to meet a retransmission request.

The most fundamental problem in communication is how efficiently and reliably data can be transmitted over a channel. The next generation multimedia mobile communication system, which is being actively studied in recent years, needs a high-speed communication system capable of processing and transmitting a variety of information such as video and wireless data beyond the initial voice-oriented service. It is essential to increase the efficiency of the system.

In general, a wireless channel environment existing in a mobile communication system is different from a wired channel environment such as multipath interference, shadowing, propagation attenuation, time-varying noise, and fading. Many factors lead to unavoidable errors and loss of information.

The loss of information causes severe distortion in the actual transmission signal, thereby acting as a factor that degrades the overall performance of the mobile communication system. In general, in order to reduce such information loss, various error control techniques are used to increase the reliability of the system according to the nature of the channel. The most basic of these error control techniques is an error correction code (error- correcting code.

Error control techniques used in communication systems can be largely divided into FEC (Forward Error Correction) technique and ARQ (Automatic Repeat Request) technique. The FEC technique uses an error correcting code to correct an error in the information received by the receiver and is used when there is no feedback channel to inform the transmitter whether the information has passed or failed. If the error correction fails, the wrong information is delivered to the user as it is. The ARQ technique is more reliable than the FEC technique because it uses a cyclic redundancy check (CRC) code, which has excellent error detection capability, and requires the transmitter to retransmit data when an error is detected in the received information.

 Specific methods used in communication systems applying ARQ include SW (Stop and Wait), GBN (Go-Back-N), SR (Seletive Repeat).

1 (a) is a diagram illustrating a data transmission method in a transmitter using a retransmission request error correction method of a SW method. Here, the transmitter transmits one information vector and waits without transmitting any more information vectors until a response is received from the receiver. The receiver checks whether the received information vector has an error using an error detection code, and if no error is detected, sends an ACK (ACKnowledgement) signal to the transmitter and, if an error is detected, sends a negative acknowledgment (NAK) signal. Send to When the transmitter receives an ACK signal from the receiver, the transmitter transmits an information vector to be transmitted next. When the transmitter receives a NAK signal, the transmitter transmits the information vector previously transmitted once again. In the case of using the SW method, there is an advantage that the system structure is simple, but the efficiency is inferior to other methods because the information is not continuously transmitted and has an idle time.

1 (b) is a diagram illustrating a data transmission method in a transmitter using a retransmission request error correction method of a GBN method. Here, the transmitter continuously transmits the information vector without waiting for a response from the receiver. The time from the transmitter transmitting one information vector to receiving the response from the receiver is called the round-trip delay time, during which the transmitter transmits N-1 other information vectors. do. If no error is detected in the received information vector, the receiver sends an ACK signal to the transmitter. If an error is detected, the receiver sends a NAK signal to the transmitter. Do not use with or without. When the transmitter receives the NAK signal, it transmits the corresponding information vector again and continuously transmits the N-1 information vectors transmitted during the round trip delay time. The GBN technique is less efficient because of the large number of error-free information vectors that are retransmitted without being used for long round trip delay times.

1 (c) is a diagram illustrating a data transmission method in a transmitter using an SR retransmission request error correction method. Here the transmitter continuously transmits the information vectors. When the transmitter receives the NAK signal from the receiver, the transmitter sends back only the corresponding information vector. This method has the advantage of being more efficient than the other methods mentioned above. However, in practice, the disadvantage is that the structure is the most complex.

However, it is possible to apply the above-mentioned ARQ method to MIMO system using multiple antennas. A multiple transmit multiple input (MIMO) system refers to an antenna diversity scheme using a plurality of transmit antennas and a plurality of receive antennas to mitigate multipath fading in a wireless communication system. The MIMO scheme uses a plurality of transmitting antennas to transmit a signal encoded in a coding scheme set in advance using a space-time coding (STC) scheme, thereby encoding a coding scheme in a time domain. ) To achieve a lower error rate.

As mentioned above, it is possible to apply an ARQ (automatic retransmission request) error correction method in a MIMO system using multiple antennas. Hereinafter, the term retransmission MIMO system is used to mean such a case.

2 is a diagram illustrating a transmitter configuration of a multi-antenna communication system using an error correction method of a retransmission request method. An error correction method will be described with reference to FIG. 2. First, the encoder 200 encodes the information data to be transmitted. As an encoder, various channel encoders can be used and used to construct a reliable communication system. Coded data, which is output data of the encoder 200, is input to the modulator 202. The modulator 202 modulates the input coded data by a preset modulation scheme and outputs modulation symbols (data). Here, the preset modulation scheme may be any one of modulation schemes such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM), pulse amplitude modulation (PAM), and phase shift keying (PSK). It can be one way.

A serial-to-parallel converter 204 converts serially modulated data output from the modulator 202 into parallel data to convert a space-time frequency block coder (a space-time block coder if a space-time block coder is used, or a space-time frequency block coder below). The use case is described as an example).

The space-time frequency block encoder 206 may be configured differently according to the number of antennas and the diversity scheme. For example, if four antennas are used, they can be configured as A, B, C matrices of Equation 1 below.

The number of rows in the coding matrix corresponds to the number of transmit antennas, and the number of columns represents the time required to transmit the four symbols (data).

가 각각 전송되며 두 번째 시간 간격동안 첫 번째 안테나(208)와 두 번째 안테나(210)를 통해

이 각각 전송되며 세 번째 시간 간격동안 세 번째 안테나(212)와 네 번째 안테나(214)를 통해

이 각각 전송되며 네 번째 시간 간격동안 세 번째 안테나(212)와 네 번째 안테나(214)를 통해

이 각각 전송된다. Here, A represents an encoding matrix of symbols transmitted through four transmit antennas, and s ₁ , s ₂ , s ₃ , and s ₄ represent four input symbols to be transmitted. Through the first antenna 208 and the second antenna 210 during the first time interval

Are transmitted through the first antenna 208 and the second antenna 210 during the second time interval.

Are transmitted respectively through a third antenna 412 and a fourth antenna 214 for a third time interval.

Are transmitted respectively through the third antenna 412 and the fourth antenna 214 during the fourth time interval.

Are transmitted respectively.

이 각각 전송되며 세 번째 시간 간격동안 네 개의 안테나(208, 210, 212, 214)를 통해

이 각각 전송되며 네 번째 시간 간격동안 네 개의 안테나(208, 210, 212, 214)를 통해

이 각각 전송된다. B also shows an example of a coding matrix of symbols transmitted through four transmit antennas, s ₁ , s ₂ , s ₃ , s _4, s ₅ , s ₆ , s ₇ , and s ₈ are ₈ to be transmitted. Input symbols. Are transmitted through the four antennas 208, 210, 212 and 214, respectively, during the first time interval, and through four antennas 208, 210, 212 and 214 during the second time interval.

Are transmitted respectively through four antennas (208, 210, 212, 214) during the third time interval.

Are transmitted respectively through four antennas (208, 210, 212, 214) during the fourth time interval.

Are transmitted respectively.

가 각각 전송된다.C also shows an example of a coding matrix of symbols transmitted through four transmit antennas, and s ₁ , s ₂ , s ₃ , and s ₄ represent four input symbols to be transmitted. Through the four antennas (208, 210, 212, 214) during the first time interval.

Are transmitted respectively.

In the retransmission MIMO system, the receiver may request retransmission. When retransmission is requested, the retransmission processor 216 receives a signal for the retransmission request and reconfigures the space-time frequency block encoder 206 to match the retransmission request signal.

In the prior art, when retransmission is requested from a receiver, the following schemes have been proposed in a MIMO system using four transmit antennas.

First, when the data is first transmitted, the C matrix of Equation 1 above is transmitted as shown in Equation 2 below. (This case is the case of the Spatial Multiplexing mode in the MIMO system.)

If an odd number of retransmissions is required (meaning that the retransmission request is an odd number), it is transmitted as in Equation 3.

If an even-numbered retransmission is required (which means that the re-transmission request is an even-numbered), it is transmitted as shown in Equation 4.

{This case is described in the system using three antennas of the same mode as follows. That is, when transmitting for the first time, it transmits as shown in Equation 5.                         

When the odd-numbered retransmission is requested, the transmission is performed as in Equation 6.

When the even-numbered retransmission is requested, the Equation 7 is transmitted.

}

}

Secondly, in case of transmitting data for the first time, the C matrix of Equation 1 above is transmitted as shown in Equation 8 below. (In this case, the MIMO system indicates a hybrid mode.) In other words, when data is first transmitted, Equation 8 below is used.                         

If an odd number of retransmissions is required (meaning that the retransmission request is an odd number), it is transmitted as in Equation 9 below.

When even-numbered retransmission is required (meaning that the re-transmission request is even-numbered), it is transmitted as in Equation 10 below.

In addition, the transmission pattern of the same pattern is proposed also in the diversity mode of the MIMO system using the matrix A of Equation 1 above.

As described above, the space-time frequency block encoder 206 transmits a plurality of input symbols through a plurality of antennas at a plurality of time intervals according to each space-time matrix. At this time, if retransmission is required, the transmission is performed by distinguishing between even-numbered and odd-numbered retransmissions.

3 shows a receiver configuration in a mobile communication system using a conventional retransmission MIMO scheme. 3 illustrates a receiver structure corresponding to the transmitter structure of FIG. 2. As shown, the receiver includes a plurality of receive antennas 300, 302 to 304, a space-time frequency block decoder (a space-time block encoder when the transmitter uses a space-time block encoder, and a space-time frequency block decoder will be described below as an example). 306, a channel estimator 308, a detector 310, a decoder 312, and a cyclic redundancy check (CRC) detector 314, which is an error detector.

Referring to FIG. 3, a signal transmitted through four transmitting antennas 208, 210, 212 to 214 at a transmitter is received through each of the first receiving antenna 300, the second receiving antenna 302, and the P receiving antenna 304. do. Each of the first receiving antenna 300, the second receiving antenna 302 to the P receiving antenna 304 outputs the received signal to the channel estimator 308 and the space-time frequency block decoder 306. The channel estimator 308 inputs a signal received through each of the first receiving antenna 300, the second receiving antenna 302, and the P receiving antenna 304 to display channel coefficients representing channel gain. coefficients) are estimated and output to the space-time frequency block decoder 306. That is, the channel estimator 308 estimates channel coefficients representing channel gains from the transmit antennas 208, 210, 212, 214 of FIG. 2 to the receive antennas 300, 302-304. The space-time frequency block decoder 306 estimates data input to the space-time frequency block encoder 206 based on the received signal transmitted from the transmit antennas 208, 210, 212, and 214. The detector 310 obtains an estimate of the transmitted symbols based on the output value of the space-time frequency decoder 306 and the channel coefficients from the channel estimator 308. In this case, the hypotheses symbols can be obtained by calculating decision statistics for all symbols that can be transmitted by the transmitter. An estimate of the transmission symbols, which is the output data of the detector 310, is input to the decoder 312. The decoder 312 decodes the symbol estimated value as an input value in a decoding scheme preset to correspond to the encoder 200 of the transmitter, and restores the original information data bits. The output signal of the decoder 312 is input to the CRC detector 314. If an error occurs as a result of CRC detection, a signal is requested to be retransmitted to the transmitter.

In the case of using the above method, since the retransmitted signal is transmitted to a different antenna from the initial transmitted signal, not only antenna diversity and time diversity can be obtained, but also the Alamouti method can be easily received by the receiver. have. However, in order to decode the signal at the receiver in Alamouti mode, no channel change should occur during retransmission. However, when there is a retransmission request in an actual communication system, a retransmission is performed after a few frames requiring retransmission, and thus, a channel change occurs, which makes it difficult to decode using the Alamouti method. In addition, in order to implement the Alamouti scheme, there is no problem that increases the complexity of the receiver.

That is, if the receiver is designed to retransmit using the Alamouti method when the receiver requires retransmission, it is difficult to obtain additional gain by the Alamouti method because the channel changes while the retransmission is required. Nevertheless, (-) processing or (*) processing should be performed on the transmitted signal, and the receiver should be received according to the Alamouti method. Therefore, an additional processor is required to increase the hardware complexity, which requires improvement.

Accordingly, an object of the present invention is to provide a retransmission request error correction transmitter and a transmission method capable of transmitting without error in a communication system using a plurality of transmit antennas to meet a retransmission request of a receiver and requiring no additional processor. have.

Another object of the present invention is to provide a retransmission request error correction transmitter and a transmission method capable of transmitting without error to meet a retransmission request of a receiver using a permutation transmission mode and antenna diversity in a communication system using a plurality of transmit antennas Is in.

In order to achieve the above object of the present invention, the apparatus of the present invention is a transmitter of a communication system using a plurality of transmitting antennas, the encoder for encoding the input data according to a predetermined rule to output the encoded data from the encoder A modulator for modulating the coded data according to a preset modulation scheme and outputting the modulated data; a serial / parallel converter for converting and outputting the modulated data serially output from the modulator to parallel data; and a retransmission request fed back from a receiver. According to the retransmission processor for determining the permutation data transmission mode of the initial data transmission mode and the parallel data outputted from the serial / parallel converter according to the permutation data transmission mode determined by the retransmission processor, and then transmitting them through a corresponding antenna. Construction It provides a transmitter of a communication system using a plurality of transmit antennas to a frequency block coder or space-time block encoder.

In addition, in order to achieve the object of the present invention, the method of the present invention is a method of transmitting a communication system using a plurality of transmitting antennas, encoding the input data according to a predetermined rule to output the encoded data, the encoded data Modulating the modulated data according to a preset modulation method, outputting the modulated data, converting the serially modulated data into parallel data, and outputting the modulated data transmission mode of the initial data transmission mode according to a retransmission request fed back from the receiver. A transmission method of a communication system using a plurality of transmitting antennas, comprising: determining a space-time frequency block encoding step or space-time block encoding step of encoding the parallel data according to the permutation data transmission mode and transmitting the corresponding parallel data. To provide.

In addition to the implementation of the various embodiments to achieve the object of the present invention is possible.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a diagram illustrating a transmitter configuration of a multi-antenna communication system using a retransmission request error correction method according to the present invention. This figure is apparently identical to the structure of a transmitter using the existing retransmission request error correction method. Hereinafter, a specific method of the present invention will be described.

First, we see the case of transmitting data using Spatial Multiplexing mode in MIMO system. An example is the case of the C matrix of FIG. 1 (a space-time code having a transmission rate of 4 when four antennas are used).

Here, a case of using two antennas (in case of transmission rate 2) will be described first. When the initial data is transmitted, Equation 11 is transmitted as shown in Equation 11 below.

을 전송하고 짝수 전송을 요구 하였을 경우에는

전송한다.When retransmission is requested, when the odd numbered transmission is requested as shown in Equation 12 below,

If you send an even number and send an even number

send.

In the case of using three antennas, the initial data transmission is performed as shown in Equation 13 below.

When the first retransmission is requested, the data is transmitted in the permutation form of Equation 13 as shown in Equation 14 below.

For example, the value of Equation 14 above may be the same as Equation 15 below.                     

When the j-th retransmission is requested, it is transmitted in the permutation form of Equation 13 as shown in Equation 16 below.

This approach can be easily extended to multiple antennas.

개의 송신 안테나를 사용하는 재전송 MIMO 시스템에서 데이터 전송의 초기 송신 모드는 아래의 <수학식 17>과 같다.In other words,

An initial transmission mode of data transmission in a retransmission MIMO system using two transmit antennas is shown in Equation 17 below.

If the (j) th retransmission is requested, it can be transmitted as shown in Equation 18 below.                     

를 구성할 경우

와 되도록 다르게 구성하여 재전송이 요구 되었을 경우 같은 신호가 다른 안테나로 전송 될 수 있도록 하는 것은 자명하다. 예를 들어 3개의 안테나에 대하여

들을 구성할 경우 아래의 <수학식 19>과 같이 구성 할 수 있다.At this time

When configuring

It is obvious that the same signal can be transmitted to different antennas when retransmission is required by configuring it differently. For example, for three antennas

If you configure them as shown in Equation 19 below.

Second, we see a case in which data is transmitted using diversity mode in a MIMO system. An example is the case of matrix A in Fig. 1, which is a space-time code that uses four antennas and has a transmission rate of 1. Specifically, it is shown in Equation 20 below.

In this case, when retransmission is required, when the 4n + 1th retransmission is requested, it is transmitted as in Equation 21 below. Where n is an integer.

If the 4n + 2th retransmission is requested, it is transmitted as in Equation 22 below. Where n is an integer.                     

If the 4n + 2th retransmission is requested, it is transmitted as in Equation 23 below. Where n is an integer.

If the 4n + 4th retransmission is requested, it is transmitted as in Equation 24 below. Where n is an integer.

와

만 사용하는 것도 가능하다.As mentioned above, if retransmission is required, four different transmission methods are not used.

Wow

It is also possible to use only.

Looking at the case of using three antennas, the transmission signal matrix at the initial transmission is shown in Equation 25 below.

는 3개의 안테나를 사용하고 전송 레이트를 1로 하는 시공간 부호이다. 이 경우에, 3n+1 번째 재전송이 요구되었을 경우에는 아래의 <수학식 26>과 같이 전송한다. 여기서 n은 정수이다.here

Is a space-time code that uses three antennas and has a transmission rate of 1. In this case, when the 3n + 1th retransmission is requested, it is transmitted as in Equation 26 below. Where n is an integer.

If a 3n + 2th retransmission is requested, it is transmitted as in Equation 27 below. Where n is an integer.                     

If 3n + 3th retransmission is requested, transmit as shown in Equation 28 below. Where n is an integer.

Third, we see a case where data is transmitted using Hybrid mode in MIMO system. The case of the matrix B of FIG. 1 is an example, and is specifically expressed as in Equation 29 below.

는 4개의 안테나를 사용하고 전송 레이트를 2로 하는 시공간 부호이다. From here

Is a space-time code that uses four antennas and has a transmission rate of two.

In this case, if the 4n + 1th retransmission is requested, it is transmitted as in Equation 30 below. Where n is an integer.

If the 4n + 2th retransmission is requested, it is transmitted as in Equation 31 below. Where n is an integer.

If the 4n + 3th retransmission is requested, it is transmitted as in Equation 32 below. Where n is an integer.                     

If the 4n + 4th retransmission is requested, it is transmitted as in Equation 33 below. Where n is an integer.

와

의 두 가지만을 사용하는 것도 가능하다.As mentioned above, if retransmission is required, instead of using the four different transmission methods as above,

Wow

It is also possible to use only two of them.

In the case of using three antennas, the matrix of the first transmitted signal is expressed by Equation 34 below.

는 3개의 안테나를 사용하고 전송 레이트를 2로 하는 시공간 부호이다. here

Is a space-time code that uses three antennas and has a transmission rate of two.

In this case, when the 3n + 1th retransmission is requested, the transmission is performed as shown in Equation 35 below. Where n is an integer.

If a 3n + 2th retransmission is requested, it is transmitted as in Equation 36 below. Where n is an integer.

If a 3n + 3th retransmission is requested, it is transmitted as in Equation 37 below. Where n is an integer.                     

When the signal is retransmitted according to the retransmission request of the receiver by the above-mentioned methods, since the same signal is transmitted to different antennas, it has different fading gain values for the transmitted signal, thereby obtaining antenna diversity. .

3 is a diagram illustrating a receiver configuration of a multi-antenna communication system using a retransmission request error correction method. 3 illustrates a receiver structure corresponding to the transmitter structure of FIG. 2. Since the value retransmitted by the detector 310 of the receiver is a value for a previously received signal, the signal may be estimated by combining the detection values. Unlike the conventional Alamouti method, the signal can be decoded without much additional operation.

4 is a flowchart illustrating a process of a data transmission method of a multi-antenna communication system using a retransmission request error correction method according to the present invention. That is, a diagram illustrating a data transmission procedure in a transmitter in an ARQ multiple transmission multiple reception (MIMO) communication system proposed by the present invention. Hereinafter, the present invention will be described using the flowchart of FIG. 4.

First, input information data to be transmitted is received (400). Next, the received information vector is encoded according to a predetermined rule according to the encoding scheme set (402). Next, the encoded data is modulated (404). As mentioned above, the modulation method may use a variety of BPSK, QPSK, PAM, QAM and the like. Serially modulated signals are converted and output in parallel and input to a space-time frequency block coder (or a space-time frequency block coder if a space-time block coder is used) (406). Next, according to the retransmission request received from the receiver, the number of retransmissions is determined, and according to the result, space-time frequency encoding (or space-time encoding) is performed in the permutation form of the data initial transmission mode (408) and transmitted to the antenna (410).

Here, the permutation data transmission mode of the initial data transmission mode may be configured to be directly fed back from the receiver. In this case, space-time frequency coding is performed in the permutation data transmission mode from the receiver and transmitted to the antenna.

According to the present invention, a communication system using a plurality of antennas is used to meet the retransmission request by using antenna diversity according to an improved regular rule (permutation transmission mode) according to an improved rule (permutation transmission mode) in which a receiver detects an error and feeds back a feedback. Can be transferred. Therefore, a reliable high speed communication system can be constructed.

Claims (30)

In a transmitter of a communication system using a plurality of transmit antennas, An encoder for encoding the input data according to a predetermined rule and outputting encoded data; A modulator configured to output modulated data by modulating the encoded data from the encoder in a preset modulation scheme; A serial / parallel converter for converting and outputting the modulated data which is serial output from the modulator into parallel data;  A retransmission processor for determining a permutation data transmission mode of the initial data transmission mode according to a retransmission request fed back from the receiver; Using a plurality of transmit antennas including a space-time frequency block coder or a space-time block coder for encoding parallel data output from the serial / parallel converter according to the permutation data transmission mode determined by the retransmission processor and transmitting them through a corresponding antenna. Transmitter of a communication system. The method of claim 1, And a transmitter of a communication system using the plurality of transmit antennas using N _T antennas, the data matrix of the initial data transmission mode is expressed by Equation 38 below.

The method of claim 2, When the j-th retransmission is required when the transmitter of the communication system using the plurality of transmission antennas uses N _T antennas, the data matrix of the permutation data transmission mode is represented by Equation 39 below. Transmitter.

The method of claim 1, When the transmitter of the communication system using the plurality of transmission antennas using two antennas, the data matrix of the initial data transmission mode is as shown in Equation 40 below.

The method of claim 4, wherein When retransmission is required when a transmitter of a communication system using the plurality of transmission antennas uses two antennas, the data matrix of the permutation data transmission mode requires an odd number of transmissions as shown in Equation 41 below. In one case

If you send an even number and send an even number

Transmitter, characterized in that for transmitting.

The method of claim 1, When the transmitter of the communication system using the plurality of transmit antennas using three antennas, the data matrix of the initial data transmission mode is as shown in Equation 42.

The method of claim 6, When the transmitter of the communication system using the plurality of transmit antennas uses three antennas, the data matrix of the permutation data transmission mode when j-th retransmission is required is represented by Equation 43 below. Transmitter.

The method of claim 1, And a transmitter of a communication system using the plurality of transmit antennas uses four antennas, the data matrix of the initial data transmission mode is expressed by Equation 44 below.

The method of claim 8, When the transmitter of the communication system using the plurality of transmit antennas using four antennas, the data matrix of the permutation data transmission mode is represented by Equation 45 below.

Where the above matrices are 4n + 1, 4n + 2, 4n + 3, and 4n + 4th retransmission requests, and n is an integer. The method of claim 1, When the transmitter of the communication system using the plurality of transmit antennas using three antennas, the data matrix of the initial data transmission mode is as shown in Equation 46.

The method of claim 10, When the transmitter of the communication system using the plurality of transmit antennas uses three antennas, the data matrix of the permutation data transmission mode when retransmission is requested is characterized by the following Equation 47. .

Here, the above matrices are 3n + 1, 3n + 2 and 3n + 3th retransmission requests, and n is an integer. The method of claim 1, When the transmitter of the communication system using the plurality of transmit antennas using four antennas, the data matrix of the initial data transmission mode is as shown in Equation 48.

The method of claim 12, When the transmitter of the communication system using the plurality of transmission antennas using four antennas, the data matrix of the permutation data transmission mode is represented by the following Equation 49.

Where the above matrices are 4n + 1, 4n + 2, 4n + 3, and 4n + 4th retransmission requests, and n is an integer. The method of claim 1, When the transmitter of the communication system using the plurality of transmit antennas using three antennas, the data matrix of the initial data transmission mode is as shown in Equation 50 below.

The method of claim 14, When the transmitter of the communication system using the plurality of transmit antennas uses three antennas, the data matrix of the permutation data transmission mode when retransmission is required is represented by Equation 51 below. .

Here, the above matrices are 3n + 1, 3n + 2 and 3n + 3th retransmission requests, and n is an integer. In a transmitter of a communication system using a plurality of transmit antennas, An encoder for encoding the input data according to a predetermined rule and outputting encoded data; A modulator configured to output modulated data by modulating the encoded data from the encoder in a preset modulation scheme; A serial / parallel converter for converting and outputting the modulated data which is serial outputted from the modulator into parallel data;  Communication system using a plurality of transmit antennas including a space-time frequency block encoder for transmitting parallel data output from the serial / parallel converter through a corresponding antenna according to the permutation data transmission mode of the initial data transmission mode fed back from the receiver Transmitter. In the transmission method of a communication system using a plurality of transmission antennas, Encoding the input data according to a predetermined rule and outputting encoded data; Outputting modulated data by modulating the encoded data by a preset modulation scheme; Converting serially modulated data into parallel data and outputting the parallel data;  Determining a permutation data transmission mode of the initial data transmission mode according to a retransmission request fed back from the receiver; And a space-time frequency block encoding step or a space-time block encoding step of encoding the parallel data according to the permutation data transmission mode and transmitting the same through the corresponding antenna. The method of claim 17, A transmission method of a communication system using the plurality of transmission antennas, wherein, in the case of using N _T antennas, the data matrix of the initial data transmission mode is expressed by Equation 52 below.

The method of claim 18, In the transmission method of the communication system using the plurality of transmission antennas, when the j-th retransmission is required when using N _T antennas, the data matrix of the permutation data transmission mode is expressed by Equation 53 below. A transmission method characterized by the above-mentioned.

The method of claim 9, A transmission method of a communication system using the plurality of transmission antennas, wherein when the transmitter uses three antennas, the data matrix of the initial data transmission mode is represented by Equation 54 below.

The method of claim 20, In the transmission method of the communication system using the plurality of transmission antennas, the data matrix of the permutation data transmission mode when the j-th retransmission is required when the transmitter uses three antennas is represented by Equation 55. Transmission method characterized in that.

The method of claim 1, A transmission method of a communication system using the plurality of transmission antennas, wherein, when the transmitter uses four antennas, the data matrix of the initial data transmission mode is represented by Equation 56 below.

The method of claim 22, In the transmission method of a communication system using the plurality of transmission antennas, when the transmitter uses four antennas, the data matrix of the permutation data transmission mode is represented by Equation 57 below. .

Where the above matrices are 4n + 1, 4n + 2, 4n + 3, and 4n + 4th retransmission requests, and n is an integer. The method of claim 1, A transmission method of a communication system using the plurality of transmission antennas, wherein when the transmitter uses three antennas, the data matrix of the initial data transmission mode is expressed by Equation 58 below.

The method of claim 24, In the transmission method of the communication system using the plurality of transmission antennas, the data matrix of the permutation data transmission mode when retransmission is required when the transmitter uses three antennas is represented by Equation 59 below. Transmission method characterized in that.

Here, the above matrices are 3n + 1, 3n + 2 and 3n + 3th retransmission requests, and n is an integer. The method of claim 1, A transmission method of a communication system using the plurality of transmission antennas, wherein when the transmitter uses four antennas, the data matrix of the initial data transmission mode is expressed by Equation 60 below.

The method of claim 26, In the transmission method of a communication system using the plurality of transmission antennas, when the transmitter uses four antennas, the data matrix of the permutation data transmission mode is represented by Equation 61 below. Way.

Where the above matrices are 4n + 1, 4n + 2, 4n + 3, and 4n + 4th retransmission requests, and n is an integer. The method of claim 1, A transmission method of a communication system using the plurality of transmission antennas, wherein when the transmitter uses three antennas, the data matrix of the initial data transmission mode is represented by Equation 62 below.

The method of claim 28, In the transmission method of the communication system using the plurality of transmission antennas, the data matrix of the permutation data transmission mode when retransmission is required when the transmitter uses three antennas is represented by Equation 63 below. Transmission method characterized in that.

Here, the above matrices are 3n + 1, 3n + 2 and 3n + 3th retransmission requests, and n is an integer. In the transmission method of a communication system using a plurality of transmission antennas, Encoding the input data according to a predetermined rule and outputting encoded data; Outputting modulated data by modulating the encoded data by a preset modulation scheme; Converting serially modulated data into parallel data and outputting the parallel data;  And a space-time frequency block encoding step of transmitting the parallel data through a corresponding antenna according to a permutation data transmission mode of an initial data transmission mode fed back from a receiver.

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