摘要:
An apparatus for transmitting and receiving data in a wireless communication system. In a terminal of a wireless communication system, the present invention includes receiving a physical downlink control channel (PDCCH), receiving a physical downlink shared channel (PDSCH), and demodulating the PDSCH by interpreting the PDCCH according to a type of a subframe including the PDCCH and the PDSCH.
摘要:
A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.
摘要:
A user equipment (UE) receiving a plurality of reference signals in a wireless multiple-input multiple-output (MIMO) communication system includes a transceiver configured for receiving the plurality of reference signals for multiple antennas in a sub-frame, the sub-frame including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain over a plurality of sub-carriers in a frequency domain. A first array is repeated in the frequency domain on a first OFDM symbol of the sub-frame, a second array is repeated in the frequency domain on a second OFDM symbol of the sub-frame and a third array is repeated in the frequency domain on a third OFDM symbol of the sub-frame, and each of the first, second and third arrays consists of six contiguous symbols in the frequency domain.
摘要:
A method for a user equipment to precode and transmit an uplink signal efficiently in a 4-antenna system and a method for a base station to receive the transmitted signal efficiently are disclosed. Four antennas of a user equipment can be grouped by a 2-antenna unit. In consideration of this antenna group, it is able to perform precoding using antenna selection/DFT matrix of the antenna group unit. Moreover, a rank-3 codebook can be configured to include a precoding matrix of a type in consideration of power balance per antenna and a precoding matrix including one non-zero component only in one row for maintaining a good CM property.
摘要:
The present invention relates to a method and apparatus for transmitting/receiving data in a wireless communication system. According to one aspect of the present invention, a data receiving method is provided wherein a mobile station in a wireless communication system uses a frame including a first subframe in which a physical downlink shared channel (hereinafter, referred to as “PDSCH”) includes a first cyclic prefix (hereinafter, referred to as “CP”) and a second subframe in which the PDSCH includes a second CP, wherein the data receiving method comprises a step in which the mobile station receives information on the length of the first CP from a base station, receives data from the base station through the first subframe, and removes the CP of the data using the information on the length of the first CP. The first CP and the second CP have different lengths.
摘要:
A method and apparatus for transmitting a signal in a wireless communication system are provided. The method includes: generating R spatial streams each of which is generated on the basis of an information stream and a reference signal; generating N transmit streams on the basis of the R spatial streams and a precoding matrix (where R
摘要:
An apparatus and a method for transmitting a reference signal in a radio communication system are provided. The apparatus comprises: N antennas; and a processor which is connected to the N antennas and which generates K (wherein K
摘要:
A method for transmitting a plurality of control information through a PUCCH or a PUSCH is disclosed. The method includes transmitting first control information, and transmitting second control information. The transmission of the first control information and the transmission of the second control information are performed in units of one subframe and are performed once per predetermined period, respectively. In a subframe in which the transmission of the second control information is to be simultaneously performed with the transmission of the first control information, the second control information is excluded for transmission or the first and the second information are simultaneously transmitted, according to the configuration of a closed-loop system or an open-loop system.
摘要:
An apparatus for transmitting data includes a data processing unit for generating a data symbol by channel-coding and constellation-mapping on information bits, a Discrete Fourier Transform (DFT) unit for generating a frequency domain symbol by performing DFT on the data symbols, a Multiple-Input Multiple-Output (MIMO) processing unit for generating a first transmission symbol by applying a first transmission diversity scheme to the frequency domain symbol and generating a second transmission symbol by applying a second transmission diversity scheme to the first transmission symbol, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) modulation unit for generating an SC-FDMA symbol by performing Inverse Fast Fourier Transform (IFFT) on the first transmission symbol and the second transmission symbol, and a plurality of transmission antennas for sending the SC-FDMA symbol.
摘要:
A method of transmitting precoding information in a multiple antenna system includes selecting M subbands from a plurality of subbands constituting a whole frequency band in a descending order of a channel quality indicator (CQI), where M is an integer satisfying M>0, and transmitting a first precoding matrix indicator (PMI) for the M subbands and a second PMI for a remaining band, wherein the first PMI is a PMI of a codebook selected from a first codebook set including a plurality of codebooks and the second PMI is a PMI of a codebook selected from a second codebook set including a part of the plurality of codebooks of the first codebook set. Accordingly, precoding information can be effectively transmitted by separately preparing a codebook for a best band and a codebook for a non-selected band.