Method and apparatus for data transmission based on distributed discrete power control in cooperative multi-user multi-input multi-output system
First Claim
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1. A method for data transmission based on distributed discrete power control among a plurality of transmitting entities in a closed loop cooperative multi-user multi-input multi-output (MIMO) system, the method comprising:
- coding and modulating, by a transmitting entity among the plurality of transmitting entities, a signal to be transmitted;
receiving, by the transmitting entity, feedback information from a terminal among a plurality of terminals grouped for multi-user transmission;
sharing, by the transmitting entity, a pre-coding index with the plurality of terminals, based on the feedback information;
determining, by the transmitting entity, a plurality of distributed discrete power control levels for the plurality of transmitting entities based on the feedback information, wherein each of the plurality of distributed discrete power control levels is for use by each respective transmitting entity of the plurality of transmitting entities for a cooperative transmission; and
transmitting, by the transmitting entity to the terminal, the signal according to one of the determined plurality of distributed discrete power control levels,wherein the plurality of distributed discrete power control levels are determined by performing a Hadamard product with respect to a transmission signal and a distributed discrete power control matrix.
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Abstract
Disclosed are a method and apparatus capable of enhancing a closed loop multi-input multi-output (MIMO) capacity through distributed discrete power control in the case of cooperatively transmitting information to multiple users through a downlink.
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Citations
12 Claims
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1. A method for data transmission based on distributed discrete power control among a plurality of transmitting entities in a closed loop cooperative multi-user multi-input multi-output (MIMO) system, the method comprising:
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coding and modulating, by a transmitting entity among the plurality of transmitting entities, a signal to be transmitted; receiving, by the transmitting entity, feedback information from a terminal among a plurality of terminals grouped for multi-user transmission; sharing, by the transmitting entity, a pre-coding index with the plurality of terminals, based on the feedback information; determining, by the transmitting entity, a plurality of distributed discrete power control levels for the plurality of transmitting entities based on the feedback information, wherein each of the plurality of distributed discrete power control levels is for use by each respective transmitting entity of the plurality of transmitting entities for a cooperative transmission; and transmitting, by the transmitting entity to the terminal, the signal according to one of the determined plurality of distributed discrete power control levels, wherein the plurality of distributed discrete power control levels are determined by performing a Hadamard product with respect to a transmission signal and a distributed discrete power control matrix. - View Dependent Claims (2, 3, 4)
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5. A transmitting entity for data transmission based on distributed discrete power control among a plurality of transmitting entities in a closed loop cooperative multi-user multi-input multi-output (MIMO) system, the transmitting entity comprising:
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a receiver configured to receive feedback information from a terminal among a plurality of terminals grouped for multi-user transmission; a transmitter; and a processor configured to; perform coding and modulating processes with respect to a signal to be transmitted; share a pre-coding index with the plurality of terminals, based on the feedback information; and determine a plurality of distributed discrete power control levels for the plurality of transmitting entities based on the feedback information, wherein each of the plurality of distributed discrete power control levels is for use by each respective transmitting entity of the plurality of transmitting entities for a cooperative transmission, wherein the transmitter is configured to transmit, to the terminal, the signal according to one of the determined plurality of distributed discrete power control levels, and wherein the plurality of distributed discrete power control levels are determined by performing a Hadamard product with respect to a transmission signal and a distributed discrete power control matrix. - View Dependent Claims (6, 7, 8)
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9. A method for data transmission based on distributed discrete power control among a plurality of transmitting entities in a closed loop cooperative multi-user multi-input multi-output (MIMO) system, the method comprising:
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determining, by a terminal among a plurality of terminals grouped for multi-user transmission, feedback information; transmitting the determined feedback information to a transmitting entity among the plurality of transmitting entities; determining, by the terminal, a plurality of distributed discrete power control levels for the plurality of transmitting entities based on the feedback information, wherein each of the plurality of distributed discrete power control levels is for use by each respective transmitting entity of the plurality of transmitting entities for a cooperative transmission; and receiving, by the terminal from the transmitting entity, a signal according to one of the determined plurality of distributed discrete power control levels, wherein the plurality of distributed discrete power control levels are determined by performing a Hadamard product with respect to a transmission signal and a distributed discrete power control matrix. - View Dependent Claims (10)
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11. A terminal for data transmission based on distributed discrete power control among a plurality of transmitting entities in a closed loop cooperative multi-input multi-output (MIMO) system, the terminal comprising:
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a receiver; a transmitter; and a processor, wherein the terminal is among a plurality of terminals grouped for multi-user transmission, wherein the processor is configured to; determine feedback information; and determine a plurality of distributed discrete power control levels for the plurality of transmitting entities based on the feedback information, wherein each of the plurality of distributed discrete power control levels is for use by each respective transmitting entity of the plurality of transmitting entities for a cooperative transmission, wherein the transmitter is configured to transmit the determined feedback information to a transmitting entity among the plurality of transmitting entities, wherein the receiver is configured to receive a signal from the transmitting entity according to one of the determined plurality of distributed discrete power control level levels, and wherein the plurality of distributed discrete power control levels are determined by performing a Hadamard product with respect to a transmission signal and a distributed discrete power control matrix. - View Dependent Claims (12)
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Specification