SYSTEM AND METHOD USING RATE SPLIT SCHEME BASED ON COOPERATION BETWEEN RECEIVERS

• US 20110159897A1
• Filed: 07/02/2010
• Published: 06/30/2011
• Est. Priority Date: 12/31/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Viswanath, Pramod, Shin, Won-Jae, Shin, Chang Yong, Choi, Hyun Ho, Noh, Won Jong
• Granted Patent: US 8,412,252 B2
• Time in Patent Office: Days
• US Class Current: 455/501
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

Each of a first transmitter and a second transmitter uses a rate split scheme. Each of the first transmitter and the second transmitter may transmit at least four sub-messages, and different transmission powers may be allocated to the at least four sub-messages. Also, each of receivers may cooperate with each other, may share sub-messages that act as interferences, and may extract desired messages using the shared sub-messages.

Claims

1. A communication method of a transmitter, the method comprising:

generating a transmission message comprising;

a 1-1-(i−

1)^th sub-message;

a 2-1-(i−

1)^th sub-message;

a 2-1-(i)^th sub-message; and

a 3-1-(i−

1)^th sub-message in a (i−

1)^th time slot;

allocating transmission powers A, B, C, and D [W], respectively, in the transmission message of the (i−

1)^th time slot, A, B, C, and D denoting real numbers and A>

B>

C>

D, to;

the 1-1-(i−

1)^th sub-message;

the 2-1-(i−

1)^th sub-message;

the 2-1-(i)^th sub-message; and

the 3-1-(i−

1)^th sub-message; and

generating a transmission message comprising the 2-1-(i)^th sub-message in a (i)^th time slot.

2. The method of claim 1, further comprising allocating a transmission power B to the 2-1-(i)^th sub-message in the transmission message in the (i)^th time slot.

3. The method of claim 1, further comprising determining the transmission powers A, B, C, and D based on information associated with an interference channel of a corresponding transmission/reception pair and information associated with an interference channel of an adjacent transmission/reception pair.

4. The method of claim 1, further comprising:

cooperating with the adjacent transmission/reception pair; and

collecting information associated with the interference channels.

5. The method of claim 1, wherein the allocating allocates the transmission powers A, B, C, and D, respectively, to enable a receiver of the adjacent transmission/reception pair to:

succeed in decoding of the 1-1-(i−

1)^th sub-message and the 2-1-(i−

1)^th sub-message from the transmission message in the (i−

1)^th time slot; and

fail in decoding of the 2-1-(1)^th sub-message and the 3-1-(i−

1)^th sub-message from the transmission message in the (i−

1)^th time slot.

6. The method of claim 5, wherein the allocating allocates the transmission powers A, B, C, and D, respectively, to enable a receiver corresponding to the transmitter to succeed in decoding of the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-1-(1)^th sub-message, and the 3-1-(i−

1)^th sub-message from the transmission message in the (i−

1)^th time slot.

7. The method of claim 2, wherein the allocating allocates the transmission power B to the 2-1-(i)^th sub-message to enable a receiver of the adjacent transmission/reception pair to succeed in decoding of the 2-1-(1)^th sub-message from the transmission message in the (i)^th time slot.

15. A non-transitory computer-readable recording medium storing a program implementing the method of claim 1.

8. A communication method of a receiver corresponding to a second transmitter, the method comprising:

receiving a 1-1-(i−

1)^th sub-message and a 2-1-(i−

1)^th sub-message from among the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, a 2-1-(i)^th sub-message, and a 3-1-(i−

1)^th sub-message transmitted from a first transmitter based on different transmission powers in a (i−

1)^th time slot;

receiving a 1-2-(i−

1)^th sub-message, a 2-2-(i−

1)^th sub-message, a 2-2-(i)^th sub-message, and a 3-2-(i−

1)^th sub-message transmitted from the second transmitter based on different transmission powers in the (i−

1)^th time slot;

decoding the 1-2-(i−

1)^th sub-message and the 2-2-(i−

1)^th sub-message;

eliminating the 1-2-(i−

1)^th sub-message and the 2-2-(i−

1)^th sub-message from the received sub-messages; and

providing, to a receiver corresponding to the first transmitter, the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-2-(i)^th sub-message and the 3-2-(i−

1)^th sub-message.

9. The method of claim 8, further comprising:

estimating an interference channel between the first transmitter and the receiver corresponding to the second transmitter; and

reporting information associated with the interference channel to at least one of the first transmitter and the second transmitter.

10. The method of claim 8, wherein the providing performs:

adjusting a time synchronization or a phase synchronization of each of the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-2-(i)^th sub-message, and the 3-2-(i−

1)^th sub-message; and

providing, as an analog signal, the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-2-(i)^th sub-message, and the 3-2-(i−

1)^th sub-message, to the receiver corresponding to the first transmitter.

11. The method of claim 8, wherein:

transmission powers of the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-1-(i)^th sub-message, and the 3-1-(i−

1)^th sub-message transmitted in the (i−

1)^th time slot are transmission powers A, B, C, and D [W], respectively;

A, B, C, and D denote real numbers; and

A>

B>

C>

D.

12. A communication method of a receiver corresponding to a first transmitter, the method comprising:

distinguishing a 1-1-(i−

1)^th sub-message, a 2-1-(i−

1)^th sub-message, and a 2-2-(i)^th sub-message from among the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-2-(i)^th sub-message, and a 3-2-(i−

1)^th sub-message transmitted from a receiver corresponding to a second transmitter, in response to;

the first transmitter transmitting the 1-1-(i−

1)^th sub-message, the 2-1-(i−

1)^th sub-message, the 2-1-(i)^th sub-message, and a 3-1-(i−

1)^th sub-message; and

the second transmitter transmitting the 1-2-(i−

1)^th sub-message, the 2-2-(i−

1)^th sub-message, the 2-2-(i)^th sub-message, and a 3-2-(i−

1)^th sub-message in an (i−

1)^th time slot;

receiving a 1-1-(i)^th sub-message, the 2-1-(i)^th sub-message, a 2-1-(i+1)^th sub-message, and a 3-1-(i)^th sub-message from the first transmitter in an (i)^th time slot;

receiving a 1-2-(i)^th sub-message, and the 2-2-(i)^th sub-message from the second transmitter in the (i)^th time slot; and

extracting the 1-1-(i)^th sub-message, the 2-1-(i)^th sub-message, and the 3-1-(i)^th sub-message from the sub-messages received in the (i)^th time slot, using the 1-2-(i)^th sub-message and the 2-2-(i)^th sub-message received from the receiver corresponding to the second transmitter.

13. The method of claim 12, wherein the extracting performs:

extracting the 1-1-(i)^th sub-message and the 2-1-(i)^th sub-message based on a transmission power of each of the sub-messages received in the (i)^th time slot; and

eliminating the 1-2-(i)^th sub-message from remaining sub-messages, excluding the 1-1-(i)^th sub-message and the 2-1-(i)^th sub-message among the sub-messages received in the (i)^th time slot.

14. The method of claim 13, wherein the extracting sequentially eliminates the 2-1-(i+1)^th sub-message and the 1-2-(i)^th sub-message to extract the 3-1-(i)^th sub-message, after the 1-2-(i)^th sub-message is eliminated from the remaining sub-messages.