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 for transmitting signals to reduce feedback overhead and a method for transmitting feedback information for the same are described. In transmitting signals through precoding, different codebook subsets are used in an open-loop transmission mode and a closed-loop transmission mode, thereby reducing feedback overhead. In this case, it is assumed that the codebook subsets for the respective transmission modes are optimized according to each transmission mode.
摘要:
A method for transmitting a multiple codeword (MCW) in a Multiple Input Multiple Output (MIMO) communication system is disclosed. A method for transmitting a multiple codeword (MCW) in a Multiple-Input Multiple-Output (MIMO) communication system includes performing a channel coding and modulation process for each codeword of the multiple codeword (MCW), multiplying the channel-coded-modulated result by a rotation matrix decided by either a spatial multiplexing rate or a layer (R), and performing a codeword permutation (CP) on the multiple codeword (MCW), performing a MIMO encoding on the multiple codeword (MCW), and transmitting the multiple codeword (MCW) via a multi-antenna.
摘要:
A base station in a wireless communication system transmits a CSI-RS of a cell every 1×N subframes or 1×N ms with muting CSI-RS REs of a neighboring cell every m×N subframes. A BS can estimate channel state of the neighboring cell with higher accuracy by using a CSI-RS of the neighboring cell received in the muted REs.
摘要:
A method for transmitting a channel status information reference signals (CSI-RSs) for a maximum of eight antenna ports includes mapping the CSI-RSs for a maximum of eight antenna ports onto a data region of a downlink subframe having a normal cyclic prefix (CP) configuration according to a predetermined pattern; and transmitting the downlink subframe to which the CSI-RSs mapped, wherein the predetermined pattern defines the CSI-RSs to be mapped onto two OFDM symbols of the data region in the downlink subframe and mapped to at least one of four subcarrier positions in each of the two OFDM symbols, and wherein the four subcarrier positions defined by the predetermined pattern may be two consecutive subcarrier positions and two other consecutive subcarrier positions spaced apart by four subcarriers.
摘要:
There is provided a method for placing reference signals in a wireless communication system. The method includes preparing a plurality of sub-frames for a plurality of antennas, placing a reference signal for one sub-frame and placing a reference signal for another sub-frame not to overlap with the reference signal for one sub-frame, wherein the reference signal for one sub-frame and the reference signal for another sub-frame are successively placed on contiguous OFDM symbols or on the contiguous sub-carriers. Channel estimation or data demodulation can be prevented from performance degradation.
摘要:
The present invention relates to a method for transmitting a-reference signals for measuring a channel in a downlink MIMO (Multi Input Multi Output) system The method comprises the steps of: configuring, by a base station at which Nt transmit antennas are configured, Nt reference signals for channel measurement where Nt≧1 and transmitting, by the base station, the Nt reference signals to a use equipment in subframes at a specific cycle. The specific cycle is configured to include more than one subframe.
摘要:
Disclosed is a data transmission apparatus for providing transmission diversity in an SC-FDMA (Single Carrier-Frequency Division Multiple Access) system. The data transmission apparatus comprises: a data processor, which performs coding and modulation on an information bit to generate a data symbol; an SC-FDMA processor, which changes a weight matrix per change-cycle, precodes the data symbol for each weight matrix being changed and performs SC-FDMA modulation for generating an SC-FDMA symbol; and an RF unit, which transmits the SC-FDMA symbol. With the application of a PVS method to the SC-FDMA system, not only can transmission diversity be provided, but PAPR can also be reduced and single-carrier properties can be maintained.
摘要:
A method and an apparatus of transmitting data in a multi-radio frequency (RF) system are provided. The method includes transmitting first data through a first physical channel to a first base station (BS), transmitting second data through a second physical channel to a second BS, wherein the first data and the second data are simultaneously transmitted.
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.