KR100912326B1 - Signal transmitter using the diversity path and method thereof - Google Patents

Abstract

Disclosed is a signal transmission apparatus using a diversity path. A signal transmission apparatus using a diversity path may process an original data packet including original bit information to generate a processed data packet including processed bit information. Each of the processed bit information. Is generated based on at least two of the original bit information.-And a data transmitter for transmitting the original data packet and the processed data packet via a first diversity path and a second diversity path.

Diversity, Machining, Factor Graph, Path, Iterative Decoding, XOR

Description

Signal transmission apparatus using diversity path and method thereof {SIGNAL TRANSMITTER USING THE DIVERSITY PATH AND METHOD THEREOF}

The present invention relates to a technique for maximizing diversity effect in a communication environment in which fading exists.

Recently, research has been actively conducted to provide various multimedia services including voice services in a wireless communication environment and to support high quality and high speed data transmission.

For example, there are studies on a multi-input multi-output (MIMO) communication system, a communication system using user cooperation, and a communication system using a relay node such as a decode and forward communication system.

Typically, according to a multi-input multi-output (MIMO) communication system using multiple antennas, higher data rates can be achieved even in situations where radio resources are limited. That is, in the MIMO communication system, since a transmission signal is transmitted to a destination node through a plurality of physical diversity paths generated by a plurality of antennas, a diversity effect occurs.

At this time, the diversity effect is affected by the number of physical diversity paths. In other words, as the number of physical diversity paths increases, the diversity effect increases, and a higher data rate can be achieved. However, more hardware resources and radio resources are required to increase the number of physical diversity paths.

Therefore, there is a need for a technique capable of maximizing diversity effects without requiring additional hardware resources and radio resources.

The present invention is a signal transmission apparatus using a diversity path that can increase the diversity effect without requiring additional hardware resources and radio resources by transmitting the processed data packet generated by processing the original data packet through a diversity path and its It may provide a method.

The present invention also provides a signal transmission apparatus using a diversity path that can increase the diversity effect by transmitting a processed data packet including processed bit information generated based on at least two original bit information through a diversity path; The method can be provided.

In addition, the present invention can provide a signal receiving apparatus capable of improving the diversity effect by decoding the received processed data packet and the original data packet using an iterative decoding technique.

A signal transmission apparatus using a diversity path according to an embodiment of the present invention is a data processing unit for processing an original data packet including original bit information to generate a processed data packet including processed bit information. Each of the bit information is generated based on at least two of the original bit information.-And a data transmitter for transmitting the original data packet and the processed data packet through a first diversity path and a second diversity path.

In addition, the signal receiving apparatus according to an embodiment of the present invention is a data receiving unit for receiving an original data packet including original bit information and a processed data packet generated by processing the original data packet-the processed data packet is processed bit information Wherein each of the processed bit information is generated based on at least two of the original bit informations. And a decoder configured to perform decoding by applying an iterative decoding technique based on the original bit information and the processed bit information.

In addition, in the signal transmission method using the diversity path according to an embodiment of the present invention, the process of generating an processed data packet including processed bit information by processing an original data packet including original bit information-the processing Each of the bit information is generated based on at least two of the original bit information.-And transmitting the original data packet and the processed data packet via a first diversity path and a second diversity path.

In addition, the signal receiving method according to an embodiment of the present invention receives an original data packet including original bit information and a processed data packet generated by processing the original data packet-the processed data packet is And each of the processed bit information is generated based on at least two of the original bit informations. And performing decoding by applying an iterative decoding technique based on the original bit information and the processed bit information.

The present invention provides a signal transmission apparatus and method using a diversity path that increases the diversity effect without requiring additional hardware resources and radio resources by transmitting the processed data packet generated by processing the original data packet through a diversity path. to provide.

In addition, the present invention provides a signal transmission apparatus and method using a diversity path to increase the diversity effect by transmitting a processed data packet including the processed bit information generated based on at least two original bit information through the diversity path To provide.

The present invention also provides a signal receiving apparatus for improving diversity effect by decoding received raw data packets and original data packets using an iterative decoding technique.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a signal transmission apparatus using a diversity path according to an embodiment of the present invention.

Referring to FIG. 1, a signal transmission apparatus 100 using a diversity path according to an embodiment of the present invention includes a data processor 110 and a data transmitter 120.

The data processing unit 110 processes the original data packet to generate a processed data packet. At this time, the original data packet includes a plurality of original bit informations, and the processed data packet includes a plurality of processed bit informations. Each of the processed bit information is generated based on at least two original bit informations.

In this case, the data processing unit 110 may generate processed bit information by performing an exclusive OR (XOR) operation on two adjacent original bit informations, and combine the generated processed bit information to generate a processed data packet. have. However, the data processing unit 110 of the present invention does not necessarily generate one processing bit information based on two original bit information, but may generate processing bit information based on three or more original bit information. have.

At this time, the data processing unit 110 may generate the processed data packet such that the radio resource consumed for transmitting the processed data packet is smaller than the radio resource consumed for transmitting the original data packet. In particular, the data processing unit 110 may generate the processed data packet such that the length of the processed data packet is shorter or equal to the length of the original data packet.

For example, assuming that the original data packet is 'ABCD', each of A, B, C, and D is original bit information. At this time, the processed data packet can be generated using various calculation rules based on the original data packet.

For example, if an XOR operation is used to generate a processed data packet, the processed data packet may consist of '(A XOR B) (B XOR C) (C XOR D)'. At this time, each of (A XOR B), (B XOR C), and (C XOR D) is processed data bit information.

Further, in the above-described example, since the processed data packet includes one bit information less than the original data packet, the radio resource consumed for transmitting the processed data packet is consumed for transmitting the original data packet. It can be seen that it is smaller.

At this time, the data processing unit 110 may generate processing bit information such that each original bit information undergoes more fading.

That is, in the above example, it is assumed that the original data packet and the processed data packet are transmitted through the first diversity path and the second diversity path, respectively. At this time, one of the original bit information 'B' undergoes a fading process in the process of being transmitted through the first diversity path. Also, among the processed bit information, (A XOR B) and (B XOR C) undergo a fading process in the process of being transmitted through the second diversity path.

At this time, it should be noted that 'B' is included in (A XOR B) and (B XOR C). If the receiver knows the generation rule (XOR operation) of the processed data packet and the receiver can properly decode the processed decoded packet, then 'B' associated with (A XOR B) and (B XOR C) is It can be seen that it is transmitted twice through the second diversity path.

As a result, 'B' undergoes one fading process through the first diversity path and two fading processes through the second diversity path, so that 'B' generally undergoes three fading processes. Thus, even if the number of physical diversity paths is '2', the signal transmitted through the physical diversity paths is effectively a diversity effect corresponding to more than the number of physical diversity paths. Can be received.

At this time, the data processing unit 110 is processed data so that the connection form between the factors is not a cycle form on a factor graph indicating a connection relationship according to the relationship between the processing bit information and the original bit information. You can create a packet. In this regard will be described in detail with respect to FIG.

In addition, the data transmitter 120 transmits the original data packet and the processed data packet through the first diversity path and the second diversity path.

In this case, the first diversity path and the second diversity path have independent fading characteristics. In particular, no correlation may exist between the fading characteristics of the first diversity path and the fading characteristics of the second diversity path with respect to time.

2 is a diagram illustrating an original data packet and a processed data packet according to an embodiment of the present invention.

Referring to FIG. 2, the original data packet 210 includes a plurality of original bit informations A, B, C, D, E, F, G, H,... At this time, each of the original bit information (A, B, C, D, E, F, G, H, ...) may include one bit or more data.

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I,....)을 포함한다. 이 때, '

'는 XOR 연산을 나타낸다. 이 때, 가공 비트 정보들(A

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I,....) 각각은 두 개의 오리지날 비트 정보들에 대한 XOR 연산을 통하여 생성된다.In addition, the processed data packet 220 includes a plurality of processed bit information A.

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I, ...). At this time, '

'Represents the XOR operation. At this time, the processing bit information (A)

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I, ....) are each generated through an XOR operation on two original bit informations.

However, the XOR operation described with reference to FIG. 2 is in accordance with one embodiment of the present invention, and it is apparent to those skilled in the art that the XOR operation can be easily replaced with another operation.

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I,....) 각각은 적어도 두 개의 오리지날 비트 정보들을 기초로 XOR 연산을 통하여 생성되므로, 가공 데이터 패킷(220)의 길이가 오리지날 데이터 패킷의 길이보다 짧거나 같도록 생성될 수 있다. At this time, the processing bit information (A)

B, B

C, C

D, D

E, E

F, F

G, G

H, H

Since each of the I, ..., ... is generated through an XOR operation based on at least two original bit information, the length of the processed data packet 220 may be generated to be shorter or equal to the length of the original data packet.

As a result, according to an embodiment of the present invention, since the length of the processed data packet 220 is shorter than or equal to the length of the original data packet 210, a radio resource additionally required for transmitting the processed data packet 220 is added. It may not be necessary.

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I,....)이 서로 독립적인 페이딩 특성을 갖고 있는 제1 다이버시티 경로 및 제2 다이버시티 경로를 통하여 수신기로 전송된다고 가정한다. In addition, original bit information (A, B, C, D, E, F, G, H, ...) and processing bit information (A)

B, B

C, C

D, D

E, E

F, F

G, G

H, H

It is assumed that I,...) Are transmitted to the receiver through a first diversity path and a second diversity path having fading characteristics independent from each other.

B, B

C, C

D, D

E, E

F, F

G, G

H, H

I,....)이 전송되므로, 각각의 오리지날 비트 정보들(A, B, C, D, E, F, G, H,....)은 두 번의 페이딩 과정을 더 거칠 수 있다. At this time, each of the original bit information (A, B, C, D, E, F, G, H, ....) goes through one fading process through the first diversity path. In addition, the processing bit information A through the second diversity path

B, B

C, C

D, D

E, E

F, F

G, G

H, H

Since I,...) Are transmitted, each original bit information (A, B, C, D, E, F, G, H, ...) may go through two fading steps.

Therefore, in the above example, ideally each original bit information (A, B, C, D, E, F, G, H, ...) may go through a total of three fading steps. . As a result, according to an embodiment of the present invention, a diversity effect corresponding to a larger number of physical diversity passes may be obtained.

3 is a diagram illustrating a factor graph according to an embodiment of the present invention.

Referring to FIG. 3, reference numeral 310 is a diagram illustrating a processed data packet and an original data packet when a connection form between factors is present in a factor graph. Reference numeral 311 denotes a processed data packet, and reference numeral 312 denotes an original data packet.

The factor graph shows the connection relationship depending on whether there is a relationship between the processed bit information and the original bit information. At this time, each factor on the factor graph is connected with factors that are related to each other.

In the process of decoding by the receiver, each factor on the factor graph may be identified as factors connected to it and nodes that transmit / receive a message related to decoding. That is, each factor transmits / receives a message related to decoding, such as a Posteriori value generated during the decoding process, a Log Likelihood Ratio (LLR) value, and the like. As a result, the receiver can more accurately decode the received signal through the decoding process and the message transmission / reception process for the respective factors.

B는 A 및 B와 관련되므로, A 및 B와 연결된다. 마찬가지로, A

C는 A 및 C와 연결되며, B

C는 B 및 C와 연결된다. 이 때, 도면 부호(310)에는 사이클 형태의 연결 형태가 존재한다. At reference numeral 310, A

Since B is associated with A and B, it is associated with A and B. Similarly, A

C is associated with A and C, B

C is linked to B and C. At this time, the reference numeral 310 has a cycle-shaped connection form.

In this case, the cycle type connection type refers to a type in which factors are connected such that when one factor transmits a message, the factor receives the message transmitted by the factor through a connection between the factors. .

B - B - B

C - C - A

C - A 연결을 통하여 자신이 전송한 그 메시지를 수신할 수 있다. 따라서, 도면 부호(310)에는 사이클 형태의 연결 형태가 존재한다.That is, referring to the reference numeral 310, when A transmits a message, A is A-A

B-B-B

C-C-A

The C-A connection can receive the message sent by itself. Therefore, the reference numeral 310 has a cycle form of connection.

Reference numeral 320 shows the processed data packet 321 and the original data packet 322 generated so that the connection form between the factors on the factor graph does not become a cycle form.

B로 전송할 수 있고, A

B는 A

B에 대한 디코딩 과정에서 생성된 Posteriori 값, LLR 값과 A에 대한 디코딩 과정에서 생성된 Posteriori 값, LLR 값을 C로 전송할 수 있다.At this time, A is a posteriori value, LLR value, etc. generated during the decoding process for A

Can be sent to B, A

B is A

Posteriori value, LLR value generated during the decoding process for B, Posteriori value generated during the decoding process for A, and LLR value can be transmitted to C.

As a result, the data processing unit according to an embodiment of the present invention may generate the processed data packet so that the connection form between the factors does not become a cycle on the factor graph.

4 is a block diagram showing a signal receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 4, a signal receiving apparatus according to an embodiment of the present invention includes a data receiving unit 410 and a decoding unit 420.

The data receiver 410 receives the original data packet and the processed data packet. At this time, the original data packet is composed of a plurality of original bit informations, and the processed data packet is composed of a plurality of processed bit informations.

At this time, the processed bit information may be generated based on the original bit information so that the connection form between the factors on the factor graph does not become a cycle form.

In this case, since the description of the processed data packet has already been described in detail with reference to FIGS. 1 to 3, it will be omitted below.

In addition, the decoder 420 performs decoding by applying an iterative decoding technique based on the original bit information and the processed bit information.

That is, decoding is performed on each factor on the factor graph, and each factor transmits a message generated after decoding on each factor to factors associated with it. At this time, the factors receiving the message refer to the message received in the decoding process for the message.

5 is a flowchart illustrating a signal transmission method and a signal reception method using a diversity path according to an embodiment of the present invention.

Referring to FIG. 5, steps S510 and S520 are related to a signal transmission method using a diversity path according to an embodiment of the present invention, and steps S530 and S540 are steps of the present invention. It relates to a signal receiving method according to an embodiment.

In a signal transmission method using a diversity path according to an embodiment of the present invention, an original data packet including original bit information is processed to generate a processed data packet including processed bit information (S510). At this time, each of the processed bit information is generated based on at least two of the original bit information.

At this time, the step of generating the processed data packet (S510) is a connection between factors on the factor graph (factor graph) indicating a connection relationship depending on whether there is a relationship between the processed bit information and the original bit information The processing bit information may be generated based on the original bit information so as not to form a cycle, and the processing data packet may be generated by combining the generated processing bit information.

At this time, generating the processed data packet (S510) generates the processed bit information based on the original bit information so that the length of the processed data packet is shorter or equal to the length of the original data packet, and the generated The processing may include combining the processing bit information to generate the processing data packet.

In this case, in the generating of the processed data packet (S510), the processed bit information may be generated by performing an exclusive OR (XOR) operation on the original bit information, and the processed bit information is combined to generate the processed data. It may be a step of generating a packet.

In addition, the signal transmission method using the diversity path according to an embodiment of the present invention transmits the original data packet and the processed data packet through a first diversity path and a second diversity path (S520).

In addition, the signal receiving method according to an embodiment of the present invention receives an original data packet including original bit information and a processed data packet generated by processing the original data packet (S530).

In addition, the signal reception method according to an embodiment of the present invention performs decoding by applying an iterative decoding technique based on the original bit information and the processed bit information (S540).

The signal transmission method and the signal reception method using the diversity path according to the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a block diagram illustrating a signal transmission apparatus using a diversity path according to an embodiment of the present invention.

2 is a diagram illustrating an original data packet and a processed data packet according to an embodiment of the present invention.

3 is a diagram illustrating a factor graph according to an embodiment of the present invention.

4 is a block diagram showing a signal receiving apparatus according to an embodiment of the present invention.

5 is a flowchart illustrating a signal transmission method and a signal reception method using a diversity path according to an embodiment of the present invention.

Claims (16)

A data processing unit for processing an original data packet including original bit information to generate a processed data packet including processed bit information, wherein each of the processed bit information is generated based on at least two of the original bit information. -; And A data transmitter for transmitting the original data packet and the processed data packet through a first diversity path and a second diversity path. Signal transmission apparatus using a diversity path, characterized in that it comprises a. The method of claim 1, The data processing unit The original bit information so that the connection form between factors does not become a cycle on a factor graph indicating a connection relationship between the processed bit information and the original bit information. Generating the processed bit information based on the generated bit information, and combining the generated bit information to generate the processed data packet. The method of claim 1, The data processing unit Generating the processed bit information based on the original bit information so that the length of the processed data packet is shorter or equal to the length of the original data packet, and combining the generated processed bit information to generate the processed data packet. Signal transmission apparatus using a diversity path characterized in that. The method of claim 1, The data processing unit A signal using a diversity path, wherein the processed bit information is generated by performing an exclusive OR (XOR) operation on the original bit information, and the processed data packet is generated by combining the generated bit information. Transmission device. The method of claim 4, wherein The data processing unit A diversity path comprising generating the processed bit information by performing an exclusive OR (XOR) operation on two adjacent original bit informations, and combining the generated bit information to generate the processed data packet. Signal transmission device using. The method of claim 1, The data transmission unit And transmitting the original data packet and the processed data packet through the first diversity path and the second diversity path having fading characteristics independent from each other. A data receiver for receiving an original data packet including original bit information and a processed data packet generated by processing the original data packet, wherein the processed data packet includes processed bit information, wherein each of the processed bit information includes at least two pieces of processed bit information; Generated based on the original bit information. -; And A decoder that performs decoding by applying an iterative decoding technique based on the original bit information and the processed bit information. Signal receiving apparatus comprising a. The method of claim 7, wherein The data receiving unit And receiving the original data packet through a first diversity path and receiving the processed data packet through a second diversity path having a fading characteristic independent of the first diversity path. The method of claim 7, wherein The processed bit information may not be cycled in the form of a connection between factors on a factor graph indicating a connection relationship between the processed bit information and the original bit information. And receiving the original bit information based on the original bit information. Processing an original data packet comprising original bit information to generate a processed data packet comprising processed bit information, wherein each of the processed bit information is generated based on at least two of the original bit information; And Transmitting the original data packet and the processed data packet over a first diversity path and a second diversity path Signal transmission method using a diversity path, characterized in that it comprises a. The method of claim 10, Generating the processed data packet The original bit information so that the connection form between factors does not become a cycle on a factor graph indicating a connection relationship between the processed bit information and the original bit information. And generating the processed bit information based on the generated bit information, and combining the generated bit information to generate the processed data packet. The method of claim 10, Generating the processed data packet Generating the processed bit information based on the original bit information so that the length of the processed data packet is shorter or equal to the length of the original data packet, and combining the generated processed bit information to generate the processed data packet. The signal transmission method using the diversity path, characterized in that. The method of claim 10, Generating the processed data packet Generating a processed data packet by performing an exclusive OR (XOR) operation on the original bit information, and combining the generated bit information to generate the processed data packet. Signal transmission method used. Receiving an original data packet including original bit information and a processed data packet generated by processing the original data packet, wherein the processed data packet includes processed bit information, wherein each of the processed bit information includes at least two of the Created based on original bit information. -; And Performing decoding by applying an iterative decoding technique based on the original bit information and the processed bit information Signal receiving method comprising a. The method of claim 14, The processed bit information may not be cycled in the form of a connection between factors on a factor graph indicating a connection relationship between the processed bit information and the original bit information. The signal receiving method, characterized in that it is generated based on the original bit information. A computer-readable recording medium in which a program for executing the method of any one of claims 10 to 15 is recorded.

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