Abstract: The present invention relates to not only a 4th-generation (4G) communication system such as long term evolution (LTE), but also a 5th-generation (5G) or pre-5G communication system which is provided to support a higher data rate. The present invention provides a method for performing a channel decoding operation by a reception device in a communication system, the method comprising the steps of: generating at least two resource elements (REs) into at least two RE groups; and generating a soft decision decoding metric for a signal received through each of the at least two RE groups.

Abstract: A communication method and device using beamforming in a wireless communication system are disclosed. A base station determines according to a predetermined trigger condition and a channel state of a terminal whether to enable a beam overlap mode using an overlap beam in which a plurality of unitary beams of the base station are overlapped, selects one or more best beams from among the plurality of unitary beams if it is determined that the beam overlap mode is not enabled, and transmits or receives a signal for the terminal through the selected best beams. If it is determined that the beam overlap mode is enabled, the base station forms the overlap beam in which the plurality of unitary beams of the base station are overlapped by adjusting beamforming coefficients of a beamforming unitary and transmits or receives a signal for the terminal through the overlap beam.

Abstract: Disclosed is a 5G or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4G communication system such as LTE. A method for cancelling self-interference in a full-duplex communication system is provided. The method comprises the steps of: cancelling cancellable self-interference components through an analog interference cancellation circuit, and estimating a channel state of an uplink channel and a channel state of a downlink channel on the basis of remaining residual self-interference components; estimating a channel capacity for each of possible beam combinations on the basis of the estimated uplink channel state and downlink channel state; selecting the beam combination having the largest channel capacity from among the possible beam combinations; and cancelling self-interference from a received signal on the basis of the selected beam combination.

Abstract: The present invention relates to a 5th-generation (5G) or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4th-generation (4G) communication system, such as long term evolution (LTE), and subsequent systems. According to the present invention, a method of a transmitting apparatus includes transmitting, to a receiving apparatus, reference signals through m antenna ports; and transmitting, to the receiving apparatus, the reference signals through n antenna ports, wherein each of the m antenna ports has a first polarization characteristic, each of the n antenna ports has a second polarization characteristic, the m antenna ports are included in a first axis of a two-dimensional space generated based on a vertical axis and a horizontal axis of a uniform planar array (UPA) antenna, and the n antenna ports are included in a second axis of the two-dimensional space.

Abstract: Disclosed are: a communication technique for fusing, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G communication system; and a system therefor. The communication technique can be applied, on the basis of 5G communication technology and IoT-related technology, to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety-related services, and the like). A method for estimating a channel in a communication system, according to one embodiment of the present invention, comprises the steps of: confirming a code and antenna distinguishing scheme used in channel estimation; generating a channel estimation code on the basis of the confirmed code and antenna distinguishing scheme; and transmitting the generated channel estimation code through a plurality of transmission antennas.

Abstract: The present disclosure relates to a 5G or pre-5G communication system to be provided for supporting a data rate higher than that of a 4G communication system, such as LTE, and subsequent communication systems. The present disclosure relates to a method for transmitting a reference signal (RS) in a wireless communication system, comprising the steps of: configuring a transmission resource by including at least one resource block (RB), which does not map the RS, between two RBs, which map the RS, in a first subframe; transmitting a first message for directing an RB offset indicating a gap between the two RBs, which map the RS, and locations of the RBs, which map the RS; and transmitting the RS through the configured transmission resource.

Abstract: 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.

Abstract: One or more embodiments provide a method for controlling array antenna device in a base station (BS) in a communication system. The method includes determining whether to perform a calibration operation for BSs while operating in one of a normal mode and an interference control mode. The method also includes transiting from the one of the normal mode and the interference control mode to a calibration mode based on the determining result of whether to perform the calibration operation for the BSs. A reference antenna among antennas included in the array antenna device is used in all of the normal mode, the interference control mode, and the calibration mode.

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). An operating method of a base station (BS) in a communication system supporting a time division multiplexing (TDD) scheme is provided. The operating method includes transmitting, to a user equipment (UE) which uses a second radio access technology (RAT) different from a first RAT used by other BS different from the BS, information related to downlink (DL) and uplink (UL) timing of the other BS and margin information for synchronizing DL and UL timing of the first RAT with DL and UL timing of the second RAT, wherein the information related to the DL and UL timing of the other BS is received from the other BS, or predicted by the BS.

Abstract: A method for determining an uplink (UL) channel quality by a base station (BS) includes obtaining a coverage class (CC) value of a user equipment (UE), receiving a random access (RA) signal from the UE, determining an UL channel quality of a band in which the RA signal is transmitted, based on the CC value and the RA signal, and generating UL resource allocation information based on the UL channel quality and transmitting the UL resource allocation information to the UE. The BS includes a transceiver configured to obtain a CC value of a UE and to receive a RA signal from the UE, and a controller configured to determine an UL channel quality of a band in which the RA signal is transmitted, based on the CC value and the RA signal. A UE includes determines a CC value of the UE based on a DL signal.

Abstract: A pre-5th-generation (5G) or 5G communication system for supporting higher data rates beyond 4th-generation (4G) communication system, such as a long term evolution (LTE), is provided. A method for performing a beamforming operation in a communication system supporting a frequency division-multiple input multiple output (FD-MIMO) scheme is provided. The method includes detecting a rough beam of a first dominant beam, detecting at least two codeword candidates based on the rough beam of the first dominant beam, and selecting one of the at least two codeword candidates as a final codeword.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Exemplary embodiment of the present invention provide a scheme for reducing feedback overhead when quantizing and feeding back channel state information in a MIMO system. A method for operating a receiver in a MIMO system, according to one embodiment of the present invention, includes the steps of: performing trellis coded quantization for channel information by using a codebook selected from a plurality of codebooks; and transmitting, to a transmitter, feedback information including the quantization result.

Abstract: A method for operating a resource in a base station (BS) in a wireless communication system supporting multi-carrier is disclosed. The method includes acquiring reference information related to at least one resource block (RB) to be allocated to a user equipment (UE), determining a RB type to be used in the at least one RB based on the reference information, and transmitting, to the UE, information related to the RB type to be used in the at least one RB. The present disclosure relates to a communication method and system for converging a 5th-generation (5G) communication system for supporting higher data rates beyond a 4th-generation (4G) system with a technology for internet of things (IoT), which may be applied to intelligent services based on the 5G communication technology and the IoT-related technology.

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for transmitting a signal in transmitting apparatus in a wireless communication system supporting a hybrid automatic repeat request (HARQ) scheme is provided. The method includes transmitting a signal to a receiving apparatus; detecting there is a need for a retransmission operation for the signal; and performing the retransmission operation for the signal based on at least one of a reception scheme used in the receiving apparatus or an interference characteristic of an interference signal.

Abstract: A method and an apparatus using beamforming in a wireless communication system are provided. The communication method includes detecting generation of uplink data to be transmitted from a Mobile Station (MS) to a Base Station (BS), and transmitting a scheduling request signal requesting uplink resource allocation in at least one channel region corresponding to uplink transmission and reception beams in an uplink resource area allocated to a scheduling request channel.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A terminal in a wireless communication system according to an embodiment of the present invention comprises: a controller for determining a first size corresponding to a number of bits allocated for a first PMI (precoding matrix indicator) and a second size corresponding to a number of bits allocated for a second PMI; and a transmitting unit for transmitting feedback information, including the first PMI corresponding to the first size and the second PMI corresponding to the second size, to a base station.

Abstract: A communication method and an apparatus using beamforming in a wireless communication system are provided. The communication method includes determining a candidate user set including one or more Mobile Stations (MSs), for Multiple User-Multiple Input Multiple Output (MU-MIMO) transmission, transmitting beam information indicating best Base Station (BS) transmission beams of the MSs of the candidate user set to the MSs of the candidate user set, receiving Precoding Matrix Index (PMI) information indicating a PMI to be used for baseband precoding from each of the MSs of the candidate user set, the PMI information being determined based on the beam information, and transmitting a signal precoded based on the PMI information to at least one MS.

Abstract: An apparatus and a method for configuring and managing/controlling a cluster, which is a set of Base Stations (BSs) for transmitting signals cooperatively, are provided. The method includes broadcasting cluster set information indicating information about a plurality of clusters including a serving BS to a User Equipment (UE), receiving a report of information about Received Signal Strength Indicators (RSSIs) of control signals transmitted from BSs included in the plurality of clusters from the UE, and assigning any one of the plurality of clusters to a cluster for servicing the UE based on the information about the RSSIs of the control signals.

Abstract: A method for transmitting by a reference signal transmitting apparatus a reference signal in a wireless communication system supporting a beam forming scheme is provided. The method includes transmitting beam pattern measurement window indication information including information related to at least two beam pattern measurement windows which each of reference signal receiving apparatuses will use to the reference signal receiving apparatuses; and transmitting reference signals based on beam patterns which the reference signal transmitting apparatus supports during a preset number of time units.

Abstract: The present disclosure relates to transmitting and receiving beam information in a wireless communication system. An operation of a receiving end includes: generating a signal indicating two or more analogue transmission beams which are allocable to the receiving end; and transmitting the signal. In addition, the present disclosure includes other embodiments different from the embodiment described above.