摘要:
The present disclosure relates to a 5G or pre-5G communication system to be provided to support a higher data transmission rate beyond the 4G communication system, such as LTE. The present invention provides a method for estimating a downlink channel by a receiver in a wireless communication system, the method comprising: estimating the downlink channel on the basis of a reference signal to recover an information bit, and checking whether the information bit recovery has succeeded; and when the information bit recovery has not succeeded, selecting at least one of the received signals as a virtual reference signal on the basis of the accuracy of the data reconstructed at a related resource location and the correlation between the related resource location and a resource location related to the reference signal, and estimating the downlink channel on the basis of at least one virtual reference signal.
摘要:
A modulation method and an apparatus with consideration of adaptive Hybrid Automatic Repeat reQuest (HARQ) in a wireless communication system are provided. The method of a transmission end supporting a hybrid modulation technique in which different types of modulation schemes are mixed, information of a channel state with a reception end is collected. A modulation order of a first type of a modulation scheme and a modulation order of a second type of a modulation scheme are determined. The modulation order of a first type of a modulation scheme and a modulation order of a second type of a modulation scheme form the hybrid modulation technique.
摘要:
A transmitter, a receiver, and a method for measuring a radio channel based on reference signals transmitted through a predetermined number of OFDM symbols by using multiple antennas in an ultra-high frequency band, and controlling a beam width of analog beams formed by transmission multiple antennas based on the measurement result. The transmitter uniquely distributes a predetermined number of analog beams among the analog beams formed by the array antenna in correspondence to each of the predetermined number of OFDM symbols, and repeatedly allocates the predetermined number of analog beams distributed for each of the predetermined number of OFDM symbols by targeting the subcarriers within the corresponding OFDM symbol. The receiver receives a channel measurement instruction message, measures a channel state based on reference signals transmitted through the analog beams allocated for respective subcarriers, and feeds the channel state measurement result back to the transmitter.
摘要:
The present disclosure relates to a communication technique for converging a 5G communication system, which is provided to support a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor. The present disclosure may be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related service, etc.) on the basis of a 5G communication technology and an IoT-related technology. The present disclosure relates to an efficient method and device for uplink communication in a narrow band system which provides an IoT service in a band for a broadband system, and a method for uplink communication in a narrow band system according to an embodiment of the present disclosure comprises the steps of: receiving, by a terminal, control information associated with uplink transmission of symbols from a base station; and performing, by the terminal, the uplink transmission using symbols except a second symbol overlapping with a first symbol for transmission of an uplink reference signal in a broadband system, on the basis of the control information.
摘要:
A transmission normalization in a wireless communication system adopting hybrid beamforming is provided. An operating method of a transmitter includes transmitting control information on transmission power normalization, receiving information indicating a precoding matrix and an analog beam selected based on the control information, and transmitting a signal normalized using a normalization coefficient corresponding a combination of the precoding matrix and the analog beam.
摘要:
A method of feeding back channel information by a receiver in a communication system beam forming is provided. The method includes determining an optimum reception beam using intensities of reference signals received through transmission beams of a base station for a first period through a first path for mapping analog beams of an input signal, and determining an optimum transmission beam of the transmission beams using intensities of reference signals received through the optimum reception beam for a second period through a second path for mapping analog beams of the input signal, and transmitting channel information measured by using a reference signal received through the optimum transmission beam and the optical reception beam to a transmitter.
摘要:
A method of operating a Mobile Station (MS) in a wireless communication system using beamforming includes receiving a reference signal over a plurality of downlink transmit (Tx) beams, measuring channel quality information of the received reference signal, and generating effective channel quality information by compensating for beamforming gain compensation information according to the channel quality information.
摘要:
Disclosed is a method and device for transmitting and receiving a signal by using modulation techniques in a wireless communication system. The method according to the present invention includes: selecting one of QAM and improved QAM according to at least one predefined criterion; encoding information bits to be transmitted according to a first encoding scheme and mapping encoded information bits to QAM symbols when the QAM is selected; encoding information bits to be transmitted according to a second encoding scheme and mapping encoded information bits to improved QAM symbols when the improved QAM is selected; and transmitting the QAM symbols or the improved QAM symbols through a given resource region.