KR101568299B1 - Method of using rate split scheme based on cooperation between receivers and communication system using the method - Google Patents

Abstract

Each of the first transmitter and the second transmitter uses a rate partitioning technique. In particular, each of the first transmitter and the second transmitter transmits at least four sub messages, and at least four sub messages are assigned different transmission powers. Also, each of the receivers cooperates with one another to share sub-messages serving as interferences, and extracts the desired messages using shared sub-messages.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of using a transmission rate division scheme based on cooperation between receiving ends and a communication system using the method. [0002]

The following embodiments relate to a communication method and a communication system using a rate partitioning technique.

In a communication environment in which an interference channel exists, there are a number of techniques for handling / removing interference, or for increasing the capacity of a communication system.

For example, if the strength of the interference is weak, the receiving end can regard the interference as noise, and then decode the received signal, thereby extracting the desired signal. Conversely, if the strength of the interference is strong, the receiving terminal first demodulates the interference, and after removing the interference from the received signal, extracts the desired signal. When the intensity of the interference is medium, a technique known as the Han-Kobayashi method is often used. According to the Han-Kobayashi method, the transmitting end divides the transmission message into a common message and a private message, and then, after applying the superposition coding for the common message and the private message, transmits the superposed coded message. Herein, the common message refers to a message which can be decoded by not only the receiving end corresponding to the transmitting end but also the neighboring receiving end, and the private message refers to a message decodable only by the receiving end corresponding to the transmitting end. Generally, a technique of dividing a transmission message into two or more messages and assigning different rates or transmission powers to each of the two or more messages is called a rate partitioning technique.

The transmitter communication method according to an exemplary embodiment of the present invention includes at least a 1-1- (i-1) sub message, a 2-1- (i-1) Generating a transmission message in an (i-1) < th > time slot including a 3-1- (i-1) sub message; (I-1) th sub-message, the 2-1- (i-1) th sub-message, the 2-1- A, B, C and D are real numbers, and A> B> C (D), respectively, for each of the i-th sub message and the i- ≫ D) < / RTI > And generating a transmission message in an (i) th time slot including at least the second 1- (i) sub message.

The method of communication of the transmitter may further include allocating a transmission power B to the 2-1- (i) sub message in the transmission message in the (i) th time slot.

The communication method of the transmitter may further include determining the transmission powers A, B, C, and D based on the information on the interference channel of each of the transmission / reception pair and the neighboring transmission / reception pair.

The communication method of the transmitter may further include collecting information on the interference channel in cooperation with the neighboring transmit / receive pair.

(I-1) th time slot from a transmission message in the (i-1) < th > time slot, the step of allocating each of the transmission powers A, B, (I) sub message and the 3-1- (i-1) th sub message, and the second 1- (i-1) A, B, C, and D, respectively, so as not to be successfully decoded.

(I-1) th sub-message from the transmission message in the (i-1) th time slot, the step of allocating each of the transmission powers A, B, (I-1) th sub-message, the 2-1- (i-1) th sub message and the 3-1- , B, C, and D, respectively.

The step of allocating the transmission power B to the 2-1- (i) sub message may include receiving the 2-1- (i) sub message from the transmission message in the (i) And allocating transmission power B to the 2 < nd > - (i) sub message so as to successfully decode the sub message.

A method of communicating a receiver corresponding to a second transmitter according to an exemplary embodiment of the present invention includes receiving a first 1-1- (i-1) -th subcarriers transmitted at different transmission powers from a first transmitter in an (i-1) (I-1) sub message among the 2-1- (i-1) sub message, the 2-1- (I-1) th sub message, the second 1-2- (i-1) th sub message, and the second 1-2- (i-1) sub message, a 2-2- (i) sub message and a 3-2- (i-1) sub message; (I-1) th sub message from the second 1-2- (i-1) th sub message from the second 1-2- Message and the 2 < 2 > - (i-1) sub message; (I-1) th sub message, the second 1-2- (i) sub message, and the 3-2- (i- 1) sub-message to a receiver corresponding to the first transmitter.

Wherein a communication method of a receiver corresponding to a second transmitter measures an interference channel between a receiver corresponding to the first transmitter and the second transmitter and transmits information about the interference channel to at least one of the first transmitter and the second transmitter And reporting it as one.

(I-1) sub message, the second 2-1- (i-1) sub message, the second 2-2- (i) (I-1) th sub message, the 2-1- (i-1) th sub message, and the 2 < 1) sub message, the 2-2- (i) sub message and the 3-2- (i-1) sub message as analog signals to a receiver corresponding to the first transmitter .

(I-1) th sub-message transmitted from the first transmitter in the (i-1) th time slot, the (2-1- A, B, C, D [W] (each of A, B, C and D is a real number and A> B> C> D), respectively.

A communication method of a receiver corresponding to a first transmitter according to an embodiment of the present invention is a method in which a first transmitter transmits a 1-1- (i-1) (i-1) th sub-message, and the second transmitter transmits the (1-2) (i-1) (I-1) th sub-message, the 2-2- (i-1) th sub message, the 2-2- (I-1) th sub message, the second 1-2- (i) sub message, and the third 1-2 (i-1) th sub message and the second 1-2- (i) sub message among the (i-1) step; (i) sub-message, the 2-1- (i) sub-message, the 2-1- (i + 1) Receiving a 1- (i) sub message, receiving a 1-2- (i) sub message and a 2-2- (i) sub message from the second transmitter; (I) sub-message received from the receiver corresponding to the second transmitter and the sub-messages received in the (i) th time slot using the second 1-2- (i) (I) sub message, the 2-1- (i) sub message, and the 3-1- (i) sub message from the first 1-1- (i) sub message.

Wherein the extracting of the 1-1- (i) sub message, the 2-1- (i) sub message and the 3-1- (i) sub message comprises: Extracting the 1-1- (i) sub message and the 2-1- (i) sub message based on the transmission power of each of the sub messages; (I) sub-messages from the sub-messages received in the (i) th time slot from the remaining sub-messages except for the 1-1- (i) sub message and the 2-1- - (i) removing the sub-message.

The method of claim 1, wherein extracting the 1-1- (i) sub message, the 2-1- (i) sub message and the 3-1- (i) (I + 1) sub message and the 1-2- (i) sub message to extract the 3-1- (i) ) In order from the top.

According to embodiments of the present invention, each of the receivers can cooperate with each other to share sub-messages serving as interferences, thereby improving the overall capacity of the communication system.

Further, according to embodiments of the present invention, each of the transmitters not only transmits at least four sub messages in one time slot, but also the at least four sub messages include at least one sub message transmitted in the next time slot , A higher capacity than the Han-Kobayashi method can be achieved.

1 is a diagram illustrating an example of a communication system including two transmission / reception pairs.
2 is a diagram illustrating a channel model for two transmit / receive pairs.
FIG. 3 is a diagram illustrating that source 1 and source 2 each transmit four sub-messages in an i-th time slot.
4 is a diagram illustrating Destination 1 and Destination 2 receiving sub-messages sent from each of Source 1 and Source 2 in an i-th time slot.
5 is a diagram showing Destination 2 removes the sub message COM1 (i-1) in the (i-1) th time slot.
FIG. 6 is a diagram showing that Destination 2 removes the sub message PRV _A 2 (i-1) in the i-1 th time slot.
7 is a diagram illustrating that source 1 and source 2 each transmit four sub-messages in the i < th > time slot.
FIG. 8 is a diagram showing that Destination 1 removes the sub message COM1 (i) in the i-th time slot.
FIG. 9 is a diagram showing Destination 1 removing the sub message PRV _A 1 (i) in the i-th time slot.
10 is a diagram illustrating Destination 2 providing some sub-messages to Destination 1 in the i < th > time slot.
11 shows Destination 1 in the i < th > time slot using the sub-messages received from Destination 2 to remove the sub-message PRV _A 2 (i).
FIG. 12 is a diagram showing sub-messages remaining in Destination 1 after the sub-message PRV _A 2 (i) has been removed in the i-th time slot.
13 is a diagram showing that Destination 1 additionally receives PRV _A 1 (i + 1) in the i + 1 th time slot.
Fig. 14 is a diagram showing that Destination 1 removes PRV _A 1 (i + 1) having power amplified in the (i + 1) th time slot.
FIG. 15 is a diagram showing that Destination 1 removes COM2 (i) in the (i + 1) th time slot.
16 is a flowchart illustrating an operation method of Sources 1 and 2 and Destination 1 and 2 according to an embodiment of the present invention.

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

1 is a diagram illustrating an example of a communication system including two transmission / reception pairs.

Referring to FIG. 1, in the downlink communication, each of two base stations BS1 and BS2 operates as a transmitter, and each of the two MSs MS1 and MS2 operates as a receiver. At this time, the signal transmitted from the base station 1 acts as an interference to the terminal 2, and the signal transmitted from the base station 2 acts as an interference to the terminal 1.

Also, referring to 120 of FIG. 1, in the uplink communication, each of two terminals MS1 and MS2 operates as a transmitter, and each of two base stations BS1 and BS2 operates as a receiver. At this time, the signal transmitted from the terminal 1 acts as an interference to the base station 2, and the signal transmitted from the terminal 2 acts as an interference to the base station 1.

The communication system including the two transmit / receive pairs shown in FIG. 1 may be represented by the channel model shown in FIG.

2 is a diagram illustrating a channel model for two transmit / receive pairs.

Referring to FIG. 2, the transmitter 1 and the receiver 1 constitute one transmission / reception pair, the transmitter 2 and the receiver 2 constitute another transmission / reception pair. At this time, the signal channel between the transmitter 1 and the receiver 1 is h ₁₁ , and the signal channel between the transmitter 2 and the receiver 2 is represented by h ₂₂ . In addition, the interference channel between transmitter 1 and receiver 2 is represented by h ₁₂ , and the interference channel between transmitter 2 and receiver 1 is represented by h ₂₁ . Here, the received signal of each of the receivers includes a desired signal, an interference signal, and noise.

The preferred transmission / reception method may vary depending on the states of the interference channels h ₁₂ and h ₂₁ . That is, when the intensity of the interference is weak, each of the receivers regards the interference as noise and then decodes the received signal. Further, when the intensity of the interference is strong, each of the receivers removes the interference from the received signal, and then decodes the desired signal from the remaining signals. When the intensity of the interference is intermediate, the Han-Kobayashi method described above is used. At this time, the Han-Kobayashi method may not always achieve optimal performance.

At this time, embodiments of the present invention propose a transmission rate division scheme that separates a transmission message in one time slot into at least four sub messages. At this time, at least four sub messages included in the transmission message in one time slot include some of the sub messages transmitted in the next time slot.

FIG. 3 is a diagram illustrating that source 1 and source 2 each transmit four sub-messages in an i-th time slot.

3, the source 1 is the 1-1- (i-1) sub-message (COM1 (i-1)) , the 2-1- (i-1) sub-message (PRV _A 1 (i-1 )), the 2-1- (i) sub-message (PRV _a 1 (i)) and the 3-1- (i-1) sub-message (i-1 containing the PRV _B 1 (i-1)) Lt; th > time slot. (I-1)), the second 2-2- (i-1) -th sub-message (PRV _A 2 (i-1) 1-th time slot containing the 2-2- (i) sub message (PRV _A 2 (i)) and the 3-2- (i-1) sub message (PRV _B 2 Lt; / RTI >

(I-1), the 1-2- (i-1) th sub message COM2 (i-1), the 2-1- (or transmission rate) of the i-1 sub-message PRV _A 1 (i-1) and the 2-2- (i-1) sub message PRV _A 2 (i- (I) the sub-message PRV _A 1 (i), the 3-1- (i-1) -th sub-message PRV _B 1 (i-1)), transmission power of the 2-2- (i) sub-message (PRV _a 2 (i)) and the 3-2- (i-1) sub-message _{(PRV B 2 (i-1} ) Is set to be decodable only in the destination.

The final transmit power of each of the sub-messages is determined by the state of the two interfering channels. 3 to 15, it is assumed that the strength of each of the signal channels is SNR, the strength of each of the interference channels is SNR / 2, and the intensity of the direct channel between Destination 1 and Destination 2 is SNR / 4 do.

Further, a 1-1- (i-1) sub-message (COM1 (i-1)) , the 2-1- (i-1) sub-message _{(PRV A 1 (i-1} )), the 2-1 - (i) The transmission power of each of the sub message (PRV _A 1 (i)) and the 3-1- (i-1) sub message (PRV _B 1 (i-1)) is set differently. Similarly, the 1-2- (i-1) sub-message (COM2 (i-1)) , the 2-2- (i-1) sub-message _{(PRV A 2 (i-1} )), the 2-2 - (i) The transmission power of each of the sub message (PRV _A 2 (i)) and the 3-2- (i-1) sub message (PRV _B 2 (i-1)) is also set differently. Particularly, when each of A, B, C and D is a real number and A>B>C> D, the 1-1-1 (i-1) (i-1) sub message (PRV _A 1 (i-1)), the second 1- (i) sub message (PRV _A 1 1) -th sub-message COM2 (i-1), PR2 (i-1), and PRV _B1 (i-1) are A, B, (I-1) sub message (PRV _A 2 (i-1)), the second 2-2 (i) sub message (PRV _A 2 The transmission power of each message (PRV _B 2 (i-1)) may also be A, B, C, D [W].

In Figures 3 to 15, a 1-1- (i-1) sub-message (COM1 (i-1)) , the 2-1- (i-1) sub-message _{(PRV A 1 (i-1} )) , a 2-1- (i) each of the transmission power sub-messages (PRV _a 1 (i)) and the 3-1- (i-1) sub-message _{(PRV B 1 (i-1} )) is SNR, 3SNR (I-1) sub message (COM2 (i-1)), the second 1-2 (i-1) sub message (PRV _A 2 i-1)), the 2-2- (i) sub-message (PRV _a 2 (i)) and each transmission claim 3-2- (i-1) sub-message _{(PRV B 2 (i-1} )) Power is assumed to be SNR, 3 SNR / 4, SNR / 2, and SNR / 4.

Assuming the transmission power of each of the above-described channels and the intensity of each of the sub-messages, each of Destination 1 and Destination 2 receives six sub-messages as shown in Fig.

4 is a diagram illustrating Destination 1 and Destination 2 receiving sub-messages sent from each of Source 1 and Source 2 in an i-th time slot.

Referring to FIG. 4, Destination 1 and Destination 2 each receive 6 sub messages from Source 1 and Source 2 in the (i-1) th time slot.

Since the strength of the channel between Destination 1 and Source 1 is the SNR, Destination 1 can receive all 4 sub messages from Source 1 and the intensity of the interference channel between Destination 1 and Source 2 is SNR / 2 Since, destination 1 is the 1-2- from a source 2 (i-1) sub-message (COM2 (i-1)) , the 2-2- (i-1) sub-message (PRV _A 2 (i-1 )). That is, for the second 2-2 (i) sub message (PRV _A 2 (i)) and the third 3-2 (i-1) sub message (PRV _B 2 (i-1) (I) the sub message PRV _A 2 (i) and the third (1-2) (i-1) sub message PRV _B 2 (i) since the received power at destination 2 is reduced to the noise level i-1)) is treated as a part of the noise.

Since the strength of the channel between Destination 2 and Source 2 is SNR, Destination 2 can receive all 4 sub messages from Source 2 and the intensity of the interference channel between Destination 2 and Source 1 is SNR / 2 Since, destination 2 is the 1-1- (i-1) sub-message (COM1 (i-1)) , the 2-1- (i-1) sub-message (PRV _A 1 (i-1 from the sources 1 )). At this time, in the 2-1- (i) sub message (PRV _A 1 (i)) and the 3-1- (i-1) sub message PRV _B 1 (i-1) transmitted from the source 1 (I) the sub-message PRV _A 1 (i) and the third -1- (i-1) sub message PRV _B 1 (i-1) ) Is treated as a part of noise.

With reference to FIGS. 5 to 6 below, the process of processing the received sub-messages by the source 2 will be described. Of course, Source 1 also performs the same operation as Source 2.

5 is a diagram showing Destination 2 removes the sub message COM1 (i-1) in the (i-1) th time slot.

Referring to FIG. 5, Destination 2 in the (i-1) th time slot receives the 1-2- (i-1) th sub message COM2 (i-1) having the highest power among the six received sub messages. / RTI > That is, Destination 2 can identify the first 1-2- (i-1) sub message COM2 (i-1) having the highest power among the six sub messages, i-1) sub message COM2 (i-1). At this time, Destination 2 considers the remaining five sub messages as noise.

(I-1) th sub message COM2 (i-1) from six sub messages after the first 1-2- (i-1) Is removed, in Destination 2, only five sub messages are left as shown in FIG.

FIG. 6 is a diagram showing that Destination 2 removes the sub message PRV _A 2 (i-1) in the i-1 th time slot.

6, Destination 2 in the (i-1) th time slot is divided into 2-2- (i-1) sub messages PRV _A 2 (i-1 ). At this time, Destination 2 decodes the second 2-2- (i-1) -th sub-message (PRV _A 2 (i-1)) while considering the remaining 4 sub- i-1) sub message (PRV _A 2 (i-1)).

When the 2-2- (i-1) sub message (PRV _A 2 (i-1)) is removed, only four sub messages remain in Destination 2.

Although not shown in FIG. 6, Destination 1 can also sequentially decode and remove two sub messages, and only four sub messages remain in Destination 1.

7 is a diagram illustrating that source 1 and source 2 each transmit four sub-messages in the i < th > time slot.

Referring to FIG. 7, in the i-th time slot, the source 1 transmits the first 1-1- (i) sub message COM1 (i), the second 1- (i) sub message PRV _A 1 (i) (I + 1) th sub-message (PRV _A 1 (i + 1)) and a third 3-1- (i) sub message (PRV _B 1 -2- (i) sub-message (COM2 (i)), the 2-2- (i) sub-message _{(PRV A 2 (i))} , the 2-1- (i + 1) sub-message (PRV _A 2 (i + 1) and a 3-1- (i) sub message (PRV _B 2 (i)). In this case, the 2-1- (i) sub message (PRV _A 1 (i)) is the same as that transmitted by the source 1 at the transmission power of SNR / 2 in the i-1 th time slot, - (i) The sub message (PRV _A 2 (i)) is also the same as that transmitted by source 2 with a transmit power of SNR / 2 in the i-1 th time slot.

Each of Destination 1 and Destination 2 receives 6 sub messages, like the (i-1) th time slot. Referring to FIG. 7, Destination 1 receives six sub messages.

Since the strength of the channel between the destination 1 and the source 1 is the SNR, Destination 1 transmits the first 1-1- (i) sub message (COM1 (i)), the second 1- (i) PRV _A 1 (i)), the 2-1- (i + 1) sub-message _{(PRV A 1 (i + 1} )) and the 3-1- (i) sub-message (PRV _B 1 (i)) both .

Also, since the strength of the interference channel between the destination 1 and the source 2 is SNR / 2, Destination 1 receives the 1-2- (i) sub message COM2 (i) from the source 2, i) Receive only the sub message (PRV _A 2 (i)). When waenya, a 2-1- (i + 1) sub-message _{(PRV A 2 (i + 1} )) and the received power of the 3-1- (i) sub-message (PRV _B 2 (i)) is the noise level .

FIG. 8 is a diagram showing that Destination 1 removes the sub message COM1 (i) in the i-th time slot.

Referring to FIG. 8, Destination 1 in the i-th time slot decodes the 1-1- (i) sub message COM1 (i) having the highest power among the six sub messages from the source 1 and the source 2 do. At this time, Destination 1 decodes the 1-1- (i) sub message (COM1 (i)) while considering the remaining 5 sub messages as noise, and the 1-1- (i) is removed.

When the 1-1- (i) sub message (COM1 (i)) is removed, only five sub messages are left in Destination 1.

FIG. 9 is a diagram showing Destination 1 removing the sub message PRV _A 1 (i) in the i-th time slot.

Referring to FIG. 9, Destination 1 in the i-th time slot decodes the 2-1- (i) sub message (PRV _A 1 (i)) having the highest power among the remaining five sub messages. At this time, Destination 1 decodes the 2-1- (i) sub message (PRV _A 1 (i)) while considering the remaining 4 sub messages as noise, and the 2-1- (i) (PRV _A 1 (i)) is removed.

When the 2-1- (i) sub message (PRV _A 1 (i)) is removed, only four sub messages remain in Destination 1.

10 is a diagram illustrating Destination 2 providing some sub-messages to Destination 1 in the i < th > time slot.

Referring to FIG. 10, Destination 2 provides Destination 1 with four remaining sub-messages received in the (i-1) th time slot. At this time, the four sub messages are transmitted together in the form of an analog signal. In particular, Destination 2 precisely adjusts the time synchronization and phase synchronization of four sub messages so that Destination 1 can efficiently perform analogue cancellation, and then provides four sub messages to Destination 1.

At this time, due to the path loss between Destination 1 and Destination 2, while the four submeshes are being transmitted to Destination 1, a third 2 - (i-1) sub message (PRV _B 1 (i-1)) and 2-1- (i-1) sub messages (PRV _A 1 (i-1)) are regarded as noise in Destination 1. As a result, Destination 1 receives only the 2-2- (i) sub message (PRV _A 2 (i)) and the 1-1- (i-1) sub message COM1 (i-1).

11 shows Destination 1 in the i < th > time slot using the sub-messages received from Destination 2 to remove the sub-message PRV _A 2 (i).

Referring to FIG. 11, Destination 1 removes the second 2-2 (i) sub message (PRV _A 2 (i)) from the remaining four sub messages using the sub messages provided from Destination 1. At this time, since Destination 1 already knows the first 1-1- (i-1) -th sub-message COM1 (i-1) received in the i-1th time slot, the remaining four messages and the first 2 - ((i-1)) from the remaining four sub-messages by adding two sub-messages received from Destination 1 after adding the sub- i) Remove the sub message (PRV _A 2 (i)).

Eventually, only three sub messages remain in Destination 1. More specifically, the destination of claim 1 2-1- (i + 1) sub-message _{(PRV A 1 (i + 1} )) and the 3-1- (i) sub-message (PRV _B 1 (i)) and 1-2- (i) Only the sub message COM2 (i) remains.

FIG. 12 is a diagram showing sub-messages remaining in Destination 1 after the sub-message PRV _A 2 (i) has been removed in the i-th time slot.

(I + 1) th sub message (PRV _A 1 (i + 1)) and the 3-1- (i) sub message (PRV _B 1 (i)) and the 1-2- (i) sub message COM2 (i) remain. At this time, the powers of the 2-1- (i + 1) -th sub message (PRV _A 1 (i + 1)) and the 1-2- (i) (I + 1) sub message (PRV _A 1 (i + 1)) and the 1-2- (i) sub message COM 2 (i) It can not be decoded.

13 is a diagram showing that Destination 1 additionally receives PRV _A 1 (i + 1) in the i + 1 th time slot.

Referring to FIG. 13, in the (i + 1) th time slot, the source 1 transmits a first 1-1- (i + 1) _{PRV A 1 (i + 1)} ), the 2-1- (i + 2) sub-message _{(PRV A 1 (i + 2} )) and the 3-1- (i + 1) sub-message (PRV _B 1 ( i + 1)) and the transfer source 2 is the 1-2- (i + 1) sub-message (COM2 (i + 1)), the 2-2- (i + 1) sub-message (PRV _a 2 ( i + 1)), the 2-1- (i + 2) sub-message _{(PRV A 2 (i + 2} )) and the 3-1- (i + 1) sub-message _{(PRV B 2 (i + 1} ) ). At this time, the 2-1- (i + 1) th sub message (PRV _A 1 (i + 1)) is the same as that transmitted by the source 1 with the transmission power of SNR / 2 in the i th time slot, 2 (i + 1) sub message (PRV _A 2 (i + 1)) is also the same as that transmitted by source 2 with a transmit power of SNR / 2 in the i th time slot.

At this time, the destination of claim 1 1-1- (i + 1) sub-message (COM1 (i + 1)) and the 2-1- (i + 1) sub-message _{(PRV A 1 (i + 1} )) (I + 1) sub message (PRV _A 1 (i + 1)) received in the (i + 1) th time slot and the remaining 2-1- +1) sub message (PRV _A 1 (i + 1)) are combined with each other. Therefore, the power of the 2-1- (i + 1) -th sub-message (PRV _A 1 (i + 1)) is amplified unlike that shown in Fig.

Finally, Destination 1 may have three sub messages with different powers.

Fig. 14 is a diagram showing that Destination 1 removes PRV _A 1 (i + 1) having power amplified in the (i + 1) th time slot.

14, Destination 1 decodes the second 1- (i + 1) -th sub message (PRV _A 1 (i + 1)) having the strongest power among the three sub messages and then removes it . Thus, in Destination 1 only the sub messages with two different powers are left.

More specifically, the 2-1- (i + 1) sub-message _{(PRV A 1 (i + 1} )) after the removal, the destination of claim 1 3-1- (i) sub-message (PRV _B 1 (i)) and the 1-2- (i) sub message COM2 (i) remain.

FIG. 15 is a diagram showing that Destination 1 removes COM2 (i) in the (i + 1) th time slot.

Referring to FIG. 15, Destination 1 has a strong power among the 3-1- (i) sub message (PRV _B 1 (i)) and the 1-2- (i) 1-2- (i) Decodes and removes the sub message COM2 (i). Therefore, the destination 3-1- (i) sub message (PRV _B 1 (i)) remains in Destination 1.

As a result, Destination 1 can decode all desired sub messages.

16 is a flowchart illustrating an operation method of Sources 1 and 2 and Destination 1 and 2 according to an embodiment of the present invention.

Referring to FIG. 2 and FIG. 16, each of the source 1 and the source 2 grasps channel information before transmitting a message. That is, the source 1 is an estimate of h request ₁₁ to the destination one to identify an intensity of ₁₁ h. At this time, the destination 1 after measuring the intensity of the SNR1 h _11, and the feedback SNR1 to one source. Source 2 also requests destination 2 to estimate h ₂₂ , and Destination 2 feeds back SNR 2 to source 2 after measuring SNR 2, which is the strength of h ₂₂ .

Further, source 1 requests estimation of interference channel h ₁₂ to destination 2, and destination 2 measures INR (Interference to Noise Ratio) 2, which is the strength of interference channel h ₁₂ , and then sends INR 2 to source 2 do. Source 1 also requests Destination 1 to estimate the interference channel h ₂₁ , and Destination 1 feeds back INR 1 to Source 1 after measuring INR 1, which is the strength of interference channel h ₂₁ . Then, Source 1 and Source 2 share INR1 and INR2 with each other.

In addition, Destination 1 and Destination 2 also request estimation of the channel between each other, and share information about the strength of the channel.

When the sources and destinations have finished measuring and exchanging information about the channels, each of the sources constitutes a transmission message comprising four sub messages.

More specifically, in the i < th > time slot, the source 1 transmits the first 1-1- (i) sub message COM1 (i), the second 1- (i) sub message PRV _A 1 (i) (I + 1) th sub message (PRV _A 1 (i + 1)) and the third 3-1- (i) sub message (PRV _B 1 - (i) sub-message (COM2 (i)), the 2-2- (i) sub-message _{(PRV A 2 (i))} , the 2-1- (i + 1) sub-message (PRV _A 2 (i +1) and a 3-1- (i) sub message (PRV _B 2 (i)).

At this time, two of the four sub-messages sent from the source 1 act as interference in Destination 2, and two of the four sub-messages sent from the source 2 are subject to interference in Destination 1 .

(I) the sub message (COM1 (i)), the 2-1- (i) sub message (i), the sub message PRV _a after decoding the 1 (i)), to remove the 1-1- (i) sub-message (COM1 (i)), the 2-1- (i) sub-message (PRV _a 1 (i)) . Destination 2 also receives two sub-messages having the strongest power among the received six sub-messages, the 1-2- (i) sub message (COM2 (i)), the 2-2- (i) PRV _a then decodes the 2 (i)), to remove the 1-2- (i) sub-message (COM2 (i)), the 2-2- (i) sub-message (PRV _a 2 (i)) .

Destination 1 and destination 2 each share the remaining sub messages. That is, Destination 1 provides the remaining four sub messages to Destination 2, and Destination 2 also provides the remaining four sub messages to Destination 1.

Destination 1 also performs interference cancellation using sub-messages provided from destination 2, and Destination 2 performs interference cancellation using sub-messages provided from destination 1.

As a result, Destination 1 decodes the 2-1- (i + 1) -th sub message (PRV _A 1 (i + 1)) and the 3-1- (i) sub message (PRV _B 1 Destination 2 can decode the 2-1- (i + 1) sub message (PRV _A 2 (i + 1)) and the 3-1- (i) sub message (PRV _B 2 can do.

As a result, destinations 1 and 2 can decode all desired sub messages.

The methods according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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 machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

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

COM1 (i-1): 1-1- (i-1)

Claims (15)

(I-1) th sub message, the 2-1- (i-1) th sub message, the 2-1- Generating a transmission message in an (i-1) < th >
(I-1) th sub-message, the 2-1- (i-1) th sub-message, the 2-1- A, B, C and D are real numbers, and A>B> C (D), respectively, for each of the i-th sub message and the i- ≫ D) < / RTI > And
Generating a transmission message in the (i) th time slot including at least the second 1- (i) sub message
And transmitting the transmission data to the transmitter. The method according to claim 1,
Allocating a transmission power B to the 2-1- (i) sub message in the transmission message in the (i) th time slot;
Further comprising the steps of: The method according to claim 1,
Determining transmission powers A, B, C, and D based on information on an interference channel of the corresponding transmit / receive pair and neighboring transmit / receive pairs,
Further comprising the steps of: The method of claim 3,
Collecting information on the interference channel in cooperation with the neighboring transmit / receive pair
Further comprising the steps of: The method according to claim 1,
The step of allocating each of the transmission powers A, B, C and D
(I-1) th sub-message and the second 1- (i-1) th sub-message from the transmission message in the (i-1) B, C, D (i-1) sub messages so that it is not possible to successfully decode the 2-1- (i) sub message and the 3-1- Wherein the step of assigning each of the plurality of communication channels comprises the steps of: 6. The method of claim 5,
The step of allocating each of the transmission powers A, B, C and D
(I-1) th sub-message, the second 1- (i-1) th sub-message, the second-1- (I-1) sub message and the (3-1-) (i-1) sub message in order to successfully decode the 3-1- . 3. The method of claim 2,
The step of allocating the transmission power B to the 2-1- (i)
(I) sub-message so that the receiver of the neighboring transmit / receive pair can successfully decode the 2-1- (i) sub message from the transmission message in the (i) And assigning a transmission power B to the transmission power. A communication method of a receiver corresponding to a second transmitter,
(i-1) th sub-message, the 2-1- (i-1) th sub-message, and the 2-1- - (i-1) th sub message and the 2 nd 1 - (i-1) th sub message among the (i-1) A second 1-2- (i-1) sub message, a second 2-2- (i) sub message, and a second 1-2- Receiving a 3-2- (i-1) sub message;
(I-1) th sub message from the second 1-2- (i-1) th sub message from the second 1-2- Message and the 2 < 2 > - (i-1) sub message; And
(I-1) th sub message, the second 1-2- (i) sub message, and the 3-2- (i-1) ) Sub-message to a receiver corresponding to the first transmitter
Wherein the second transmitter comprises a first transmitter and a second transmitter. 9. The method of claim 8,
Measuring an interference channel between the first transmitter and a receiver corresponding to the second transmitter and reporting information about the interference channel to at least one of the first transmitter or the second transmitter
Wherein the second transmitter further comprises: 9. The method of claim 8,
The step of providing to a receiver corresponding to the first transmitter
(I-1) th sub message, the second 1-2- (i) sub message, and the 3-2- (i-1) (I-1) th sub message, the 2-1- (i-1) th sub message, the 2-2- i) sub-message and the 3-2- (i-1) -th sub-message as analog signals to a receiver corresponding to the first transmitter. 9. The method of claim 8,
(I-1) th sub-message transmitted from the first transmitter in the (i-1) th time slot, the (2-1- A, B, C, D [W] (each of A, B, C and D is a real number and A> B > C > D). A communication method of a receiver corresponding to a first transmitter,
(i-1) th sub-message, the second 1-1- (i-1) th sub-message, the second 1- (i) (I-1) th sub message, and the second transmitter transmits the first 1-2- (i-1) th sub message, the second 1-2- (I-1) th sub message transmitted from a receiver corresponding to the second transmitter when transmitting the 2- (i) sub message and the (3-2) (i-1) (I-1) th sub-message among the 2-1- (i-1) th sub message, the 2-2- ) Sub message and the second 2-1- (i-1) sub message, the second 2-2- (i) sub message;
(i) sub-message, the 2-1- (i) sub-message, the 2-1- (i + 1) Receiving a 1- (i) sub message, receiving a 1-2- (i) sub message and a 2-2- (i) sub message from the second transmitter; And
(I) sub message received from the receiver corresponding to the second transmitter and the second 1-2 (i) sub message received from the receiver corresponding to the second transmitter from the sub messages received in the (i) Extracting the 1-1- (i) sub message, the 2-1- (i) sub message and the 3-1- (i)
/ RTI > 13. The method of claim 12,
The step of extracting the 1-1- (i) sub message, the 2-1- (i) sub message and the 3-1- (i)
Extracting the 1-1- (i) sub message and the 2-1- (i) sub message based on a transmission power of each of the sub messages received in the (i) th time slot; And
From the sub-messages received in the (i) th time slot, from the remaining sub-messages except for the 1-1- (i) sub message and the 2-1- (i) (i) removing the sub message
/ RTI > 14. The method of claim 13,
The step of extracting the 1-1- (i) sub message, the 2-1- (i) sub message and the 3-1- (i)
(I + 1) sub-message to extract the 3-1- (i) sub message after the 1-2- (i) sub message is removed from the remaining sub- And removing the message and the 2 < 2 > - (i)
Further comprising the steps of: A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 1 to 14.

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