Method and apparatus for controlling power in a decode-and-forward relay system
First Claim
1. A method of controlling power in a decode-and-forward relay system, the method comprising:
- acquiring first channel information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal;
identifying a particular quantization region including the channel information from the acquired first through third channel information; and
determining information of a transmit signal power corresponding to the particular quantization region,wherein the particular quantization region is classified by grouping the first through third channel information into an integer group according to a predetermined criterion.
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Abstract
A method and apparatus for controlling power in a decode-and-forward (DF) relay system is provided. The method of controlling power in a DF relay system includes: acquiring first channel information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal; determining a power level of the source node from the acquired first through third channel information; and feeding back the determined power level to the source node and the relay node.
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Citations
18 Claims
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1. A method of controlling power in a decode-and-forward relay system, the method comprising:
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acquiring first channel information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal; identifying a particular quantization region including the channel information from the acquired first through third channel information; and determining information of a transmit signal power corresponding to the particular quantization region, wherein the particular quantization region is classified by grouping the first through third channel information into an integer group according to a predetermined criterion. - View Dependent Claims (2, 3)
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4. A method of controlling power in a decode-and-forward relay system, the method comprising:
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extracting long term variance information of a first link between a source node and a destination node, long term variance information of a second link between the source node and a relay node, and long term variance information of a third link between the relay node and the destination node, when feedback information is absent; calculating a transmit signal power of the source node using the extracted long term variance information; and transmitting a signal at the calculated transmit signal power. - View Dependent Claims (5, 6)
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7. A method of controlling power in a decode-and-forward relay system, the method comprising:
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acquiring first channel information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal, when feedback information is infinite; calculating an optimal transmit signal power by using the acquired first through third channel information; and transmitting the calculated information of the transmit signal power from the destination node to any one of the source node and the relay node. - View Dependent Claims (8, 9)
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10. An apparatus for controlling power in a decode-and-forward relay system, the apparatus comprising:
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an acquirement unit which acquires first channel, information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal; an identifier which identifies a particular quantization region including the channel information from the acquired first through third channel information; and a determination unit which determines information of a transmit signal power corresponding to the particular quantization region, wherein the particular quantization region is classified by grouping the first through third channel information into an integer group according to a predetermined criterion. - View Dependent Claims (11, 12)
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13. An apparatus for controlling power in a decode-and-forward relay system, the apparatus comprising:
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an extractor which extracts long term variance information of a first link between a source node and a destination node, long term variance information of a second link between the source node and a relay node, and long term variance information of a third link between the relay node and the destination node when feedback information is absent; a calculator which calculates a transmit signal power of the source node by using the extracted long term variance information; and a transmitter which transmits a signal at the calculated transmit signal power. - View Dependent Claims (14, 15)
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16. An apparatus for controlling power in a decode-and-forward relay system, the apparatus comprising:
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an acquirement unit which acquires first channel information of a first link between a source node and a destination node, second channel information of a second link between the source node and a relay node, and third channel information of a third link between the relay node and the destination node, by using a pilot signal, when feedback information is infinite; a calculator which calculates an optimal transmit signal power using the acquired first through third channel information; and a transmitter which transmits the calculated information of the transmit signal power from the destination node to any one of the source node and the relay node. - View Dependent Claims (17, 18)
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Specification