METHOD FOR TRANSMITTING CHANNEL INFORMATION, DEVICE THEREOF, BASE STATION, AND METHOD FOR TRANSMITTING FOR BASE STATION THEREOF
First Claim
1. A transmission method of channel information by an apparatus in awireless communication system, the method comprising:
- estimating a channel by receiving a reference signal;
estimating a precoding matrix suitable for the estimated channel from a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes, configuring a subset by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, and generating channel information containing multiple access information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset; and
transmitting the channel information generated in generating the channel information into an air.
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Abstract
The present disclosure relates to transmission and reception using a multiple-input multiple-output (MIMO) antenna in a wireless communication system in which a method includes: receiving a reference signal to estimate a channel; estimating a suitable pre-coding matrix from the estimated channel similar to a Discrete Fourier Transform (DFT) matrix which has at least two different DFT code books; providing a relatively large DFT matrix subset with a pre-coding matrix phase different from the set of said suitable pre-coding matrix; generating channel information which includes multiple access information on at least one DFT matrix which is small enough to be similar to said subset pre-coding matrix; and transmitting said channel information generated in said channel information generating step.
75 Citations
19 Claims
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1. A transmission method of channel information by an apparatus in a
wireless communication system, the method comprising: -
estimating a channel by receiving a reference signal; estimating a precoding matrix suitable for the estimated channel from a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes, configuring a subset by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, and generating channel information containing multiple access information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset; and transmitting the channel information generated in generating the channel information into an air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A channel information feedback apparatus in a wireless communication system, comprising:
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a channel estimator for estimating a channel receiving by a reference signal; a channel information generator for estimating a precoding matrix suitable for the channel estimated by the channel estimator from a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes, configuring a subset by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, and generating channel information containing multiple access information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset; and a feedback unit for feeding back the generated channel information. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A base station comprising:
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a layer mapper for mapping a data symbol into a layer; a precoder for receiving feedback of channel state information and multiple access information from one or more user equipments and precoding mapped symbols by using each precoding matrix; a scheduler for, when the user equipment allows simultaneous accesses of the user equipment and one or more other user equipments, selecting a user equipment to receive data by using the channel state information and the multiple access information and generating precoding matrixes of the precoder; and an antenna array including two or more antennas for propagating a precoded symbol into an air, wherein, when a precoding matrix suitable for a channel estimated by receiving a reference signal by a user equipment is estimated in a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes and a subset is configured by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, the multiple access information is information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset.
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19. A transmission method of a base station, comprising:
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mapping a data symbol into a layer; receiving feedback of channel state information and multiple access information from one or more user equipments and precoding mapped symbols by using each precoding matrix; when the user equipment allows simultaneous accesses of the user equipment and one or more other user equipments, selecting a user equipment to receive data by using the channel state information and the multiple access information and generating precoding matrixes of a precoder; and propagating a precoded symbol into an air through an antenna array including two or more antennas, wherein, when a precoding matrix suitable for a channel estimated by receiving a reference signal by a user equipment is estimated in a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes and a subset is configured by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, the multiple access information is information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset.
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Specification