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). There is provided a method for operating a base station in a wireless communication system including receiving first feedback information indicating a first preferred beam from a first terminal and second feedback information indicating a second preferred beam from a second terminal, allocating to the second terminal the first preferred beam as a non-preferred beam of the second terminal, and transmitting first data to the first terminal and second data to the second terminal using the first preferred beam as a preferred beam of the first terminal and the non-preferred beam of the second terminal.

Abstract: A method and apparatus are provided for controlling a data rate in a mobile communication system. The method includes changing an offset from a first offset used in a previous packet to a second offset determined based on whether or not the previous packet is successfully received by a second apparatus; determining whether or not a second channel quality in which the second offset is applied is within a range from a minimum quality to a maximum quality; if it is determined that the second channel quality is not within the range, determining that the offset is maintained as the first offset in a current packet; and transmitting, to the second apparatus, the current packet according to a first channel quality in which the first offset is applied.

Abstract: A method and apparatus are provided for controlling a data rate in a mobile communication system. The method includes changing an offset from a first offset used in a previous packet to a second offset determined based on whether or not the previous packet is successfully received by a second apparatus; determining whether or not a second channel quality in which the second offset is applied is within a range from a minimum quality to a maximum quality; if it is determined that the second channel quality is not within the range, determining that the offset is maintained as the first offset in a current packet; and transmitting, to the second apparatus, the current packet according to a first channel quality in which the first offset is applied.

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). There is provided a method for operating a base station in a wireless communication system including receiving first feedback information indicating a first preferred beam from a first terminal and second feedback information indicating a second preferred beam from a second terminal, allocating to the second terminal the first preferred beam as a non-preferred beam of the second terminal, and transmitting first data to the first terminal and second data to the second terminal using the first preferred beam as a preferred beam of the first terminal and the non-preferred beam of the second terminal.

Abstract: A method and apparatus are provided for controlling a data rate in a mobile communication system. The method includes changing an offset from a first offset used in a previous packet to a second offset determined based on whether or not the previous packet is successfully received by a second apparatus; determining whether or not a second channel quality in which the second offset is applied is within a range from a minimum quality to a maximum quality; if it is determined that the second channel quality is not within the range, determining that the offset is maintained as the first offset in a current packet; and transmitting, to the second apparatus, the current packet according to a first channel quality in which the first offset is applied.

Abstract: Disclosed are an apparatus and system for controlling a data rate in a mobile communication system. The apparatus includes a controller which is configured to update an offset when an error rate of a channel needs to be corrected based on a code rate of a frame, presence/absence of an error through Cyclic Redundancy Check (CRC), and channel state information such as an offset value, and maintain the offset when the code rate of the channel is a maximum value or a minimum value.

Abstract: Disclosed are an apparatus and system for controlling a data rate in a mobile communication system. The apparatus includes a controller which is configured to update an offset when an error rate of a channel needs to be corrected based on a code rate of a frame, presence/absence of an error through Cyclic Redundancy Check (CRC), and channel state information such as an offset value, and maintain the offset when the code rate of the channel is a maximum value or a minimum value.

Abstract: Method of estimating a channel in a wireless communication system by obtaining a channel impulse response from a pilot signal included in a received signal; estimating a timing offset with a maximum peak power value for the channel impulse response; and performing a phase compensation using the estimated timing offset and estimating a channel which is applied with the compensated phase.

Abstract: A method and an apparatus for estimating an offset are provided. The method includes determining one of a frequency offset and a timing offset to be estimated first for pilot symbols detected from a received signal, estimating one of the frequency offset and the timing offset for the pilot symbols according to the determination, compensating for an offset of the pilot symbols based on the estimated offset, and estimating remaining one of the frequency offset and the timing offset which is not estimated for the offset compensated pilot symbols.

Abstract: A method and an apparatus for estimating an offset are provided. The method includes determining one of a frequency offset and a timing offset to be estimated first for pilot symbols detected from a received signal, estimating one of the frequency offset and the timing offset for the pilot symbols according to the determination, compensating for an offset of the pilot symbols based on the estimated offset, and estimating remaining one of the frequency offset and the timing offset which is not estimated for the offset compensated pilot symbols.

Abstract: A method for detecting a received signal by a Base Station (BS) in a communication system is provided. The method includes receiving a BandWidth Request (BW REQ) indicator, determining first interference signal streams representing BW REQ messages, determining whether the first interference signal streams include at least one second interference signal stream which is in a null state, determining a first Maximum Likelihood (ML) metric, determining a second ML metric for each of a case where a value of bits constituting each of third interference signal streams except for the at least one second interference signal stream among the first interference signal streams is 1, and calculating a minimum error distance of the BW REQ messages received from Mobile Stations (MSs) based on the first ML metrics and the second ML metrics.

Abstract: A method and an apparatus for transmitting a signal in a communication system are provided. An information vector is encoded according to a Low Density Parity Check (LDPC) encoding scheme, thereby generating an LDPC codeword. Minimum surviving check nodes are reserved for recovery of punctured nodes in the LDPC codeword. A check node is selected having a smallest cost function from among unreserved check nodes. A variable node is selected being unpunctured and having a smallest cost function from among variable nodes connected to the selected check node. The selected variable node is punctured when the selected variable node is not connected to the reserved check node. A stopping set check is performed when the selected variable node is connected to the reserved check node. The variable node is punctured when the stopping set check has been successfully performed. The check node is selected until there remains no variable node to be punctured and puncturing the variable node.

Abstract: Method of estimating a channel in a wireless communication system by obtaining a channel impulse response from a pilot signal included in a received signal; estimating a timing offset with a maximum peak power value for the channel impulse response; and performing a phase compensation using the estimated timing offset and estimating a channel which is applied with the compensated phase.

Abstract: A method for puncturing a Low Density Parity Check (LDPC).

Abstract: A method and an apparatus for transmitting a signal in a communication system are provided. An information vector is encoded according to a Low Density Parity Check (LDPC) encoding scheme, thereby generating an LDPC codeword. Minimum surviving check nodes are reserved for recovery of punctured nodes in the LDPC codeword. A check node is selected having a smallest cost function from among unreserved check nodes. A variable node is selected being unpunctured and having a smallest cost function from among variable nodes connected to the selected check node. The selected variable node is punctured when the selected variable node is not connected to the reserved check node. A stopping set check is performed when the selected variable node is connected to the reserved check node. The variable node is punctured when the stopping set check has been successfully performed. The check node is selected until there remains no variable node to be punctured and puncturing the variable node.

Abstract: Provided is a method for puncturing a Low Density Parity Check (LDPC) code that is expressed in a factor graph configured by a bit node and a check node connected to an edge and is decoded by a parity check matrix with an information region and a parity region. A mother code with a code rate is generated. Bit nodes configuring the parity region are grouped in a block unit. A transmission code rate and the number of bits to be punctured in the mother code according to the transmission code rate are set. A puncturing process in either the block unit or a bit unit or both is performed according to the transmission code rate. All codes with required code rates can be obtained. The LDPC code puncturing method can be flexibly applied to Hybrid Automatic Repeat Request (H-ARQ) and Incremental Redundancy (IR) systems.

Abstract: A method for puncturing a Low Density Parity Check (LDPC).