Apparatus and method for transmitting/receiving data in a multi-antenna communication system
First Claim
1. A method for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the method comprising the steps of:
- determining a terminal to which the base station will transmit data, determining antennas via which the base station will transmit data among the plurality of antennas, and determining a space pre-coding method based on the channel status information;
multiplexing transmission data into a plurality of data streams according to the number of the determined antennas, and performing coding and modulation on each of the data streams;
outputting a matrix select signal for selecting one of a plurality of space pre-coding matrixes according to the space pre-coding method, and spatial-coding each of the coded streams with the matrix selected based on the matrix select signal; and
performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on each of the spatial-coded streams, and transmitting each of the OFDM-modulated streams via an associated antenna.
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Abstract
An apparatus for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas. Based on the channel status information, a scheduler determines a terminal to which the base station will transmit data, determines antennas via which the base station will transmit data among the plurality of antennas, and determines a space pre-coding method. A multiplexer multiplexes transmission data into a plurality of data streams according to the number of the determined antennas. A modulation and coding unit performs modulation and coding on each of the data streams. A pre-coding controller outputs a matrix select signal for selecting one of a plurality of space pre-coding matrixes according to the space pre-coding method. A space pre-coder spatial-codes each of the coded streams with the matrix selected based on the matrix select signal. An OFDM modulator performs OFDM modulation on each of the spatial-coded streams. An RF unit transmits each of the OFDM-modulated streams via an associated antenna.
45 Citations
24 Claims
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1. A method for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the method comprising the steps of:
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determining a terminal to which the base station will transmit data, determining antennas via which the base station will transmit data among the plurality of antennas, and determining a space pre-coding method based on the channel status information; multiplexing transmission data into a plurality of data streams according to the number of the determined antennas, and performing coding and modulation on each of the data streams; outputting a matrix select signal for selecting one of a plurality of space pre-coding matrixes according to the space pre-coding method, and spatial-coding each of the coded streams with the matrix selected based on the matrix select signal; and performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on each of the spatial-coded streams, and transmitting each of the OFDM-modulated streams via an associated antenna. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the apparatus comprising:
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a scheduler for determining a terminal to which the base station will transmit data, determining antennas via which the base station will transmit data among the plurality of antennas, and determining a space pre-coding method based on the channel status information; a multiplexer for multiplexing transmission data into a plurality of data streams according to the number of the determined antennas; a modulation and coding unit for performing modulation and coding on each of the data streams; a pre-coding controller for outputting a matrix select signal for selecting one of a plurality of space pre-coding matrixes according to the space pre-coding method; a space pre-coder for spatial-coding each of the coded streams with the matrix selected based on the matrix select signal; an Orthogonal Frequency Division Multiplexing (OFDM) modulator for performing OFDM modulation on each of the spatial-coded streams; and a radio frequency (RF) unit for transmitting each of the OFDM-modulated streams via an associated antenna. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the apparatus comprising:
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a scheduler for determining a terminal to which the base station will transmit data, and determining antennas via which the base station will transmit data among the plurality of antennas based on the channel status information; a multiplexer for multiplexing transmission data into a plurality of data streams according to the number of the determined antennas; a modulation and coding unit for performing modulation and coding on each of the data streams; a pre-coding controller for outputting a space pre-coding command to be applied to data streams to be transmitted to a selected terminal; a space pre-coder for spatial-coding each of the coded streams selected based on the space pre-coding command; an Orthogonal Frequency Division Multiplexing (OFDM) modulator for performing OFDM modulation on each of the spatial-coded streams; and a radio frequency (RF) unit for transmitting each of the OFDM-modulated streams via an associated antenna. - View Dependent Claims (12, 13, 14, 15)
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16. A method for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the method comprising the steps of:
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determining a terminal to which the base station will transmit data, and determining antennas via which the base station will transmit data among the plurality of antennas based on the channel status information; multiplexing transmission data into a plurality of data streams according to the number of the determined antennas; performing modulation and coding on each of the data streams; determining a space pre-coding method to be applied to data streams to be transmitted to a selected terminal, and spatial-coding each of the data streams using the determined space pre-coding method; performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on each of the spatial-coded streams; and transmitting each of the OFDM-modulated streams via an associated antenna. - View Dependent Claims (17, 18, 19, 20)
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21. An apparatus for receiving data by a terminal in a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the apparatus comprising:
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a transmission antenna pilot extractor for extracting a pilot signal transmitted via each transmission antenna from a signal received from each antenna; a MIMO channel estimator for estimating a MIMO channel using information received from the transmission antenna extractor; a pre-coding MIMO channel estimator for estimating a pre-coded MIMO channel using the estimated MIMO channel and pre-coding information; a data extractor for extracting data from the received signal; a combining and demultiplexing unit for combining and demultiplexing the data extracted by the data extractor using the signal output from the pre-coding MIMO channel estimator; and a demodulation and decoding unit for demodulating and decoding the demultiplexed signal. - View Dependent Claims (22)
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23. A method for receiving data by a terminal in a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas in a Multiple-Input Multiple-Output (MIMO) scheme, the method comprising the steps of:
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extracting a pilot signal transmitted via each transmission antenna from a signal received from each antenna at a transmission antenna pilot extractor; estimating, at a MIMO channel estimator, a MIMO channel using the extracted pilot signal; estimating, at a pre-coding MIMO channel estimator, a pre-coded MIMO channel using the estimated MIMO channel and pre-coding information; extracting, at a data extractor, data from the received signal; combining and demultiplexing the extracted data using the estimated pre-coded MIMO channel at a combining and demultiplexing unit; and demodulating and decoding the demultiplexed signal at a demodulating and decoding unit. - View Dependent Claims (24)
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Specification