Samsung Electronics Co., Ltd.

Seoul National University

Yonsei University

Korea University Industrial Academic Collaboration Foundation

Heun-Chul Lee

Jong-han Lim

Hyo-Jin Lee

Tae-Yoon Kim

In-Kyu Lee

Dong-Sik Kim

Young-Bum Kim

Youn-Sun Kim

Sung-soo Kim

Young-Soo Kim

Dong-wook Kim

Kyung-Hun Jang

Dong-jun Lee

Young-cheol Park

Hyo-Sun Hwang

Cheol-Kyu Shin

Jun-il Sohn

Jung-Hoon Suh

Sung-Yoon Cho

Jong-Jin Kim

Jong-Han Lim

Soo-bok Yeo

Young-Cheol Park

Yun-seo Ku

Won-Woo Park

Dong-Wook Kim

Jun-Il Sohn

Yun-Seo Ku

Methods, systems, apparatuses, evolved NodeB (EnBs), User Equipment (UE), and chip sets for all of the same, in cellular communication systems are described. One method for a UE includes receiving a Channel State Information Reference Signal (CSI-RS) transmitted by an eNB according to a pattern in a time-frequency resource grid determined based on the transmission scheme of the eNB, measuring the state of the transmission channel using the CSI-RS, generating channel state information based on the measuring, and transmitting the channel state information as feedback. The UE receives a downlink signal including data and a Cell-specific Reference Signal (CRS) from the eNB and estimates the transmission channel using the CRS and then acquires the data using the estimated channel.

Scheme for transmitting reference signal in wireless communication system

Methods and apparatuses are provided for determining an interference transmission mode (TM) at a communication device in a cellular communication system using a resource element (RE) defined by frequency and time. A first signal is received in one RE. The first signal comprises a serving signal and an interference signal. A first vector of the received first signal is projected onto each of N projection vectors. A traffic-to-pilot ratio (TPR) decision metric of the interference signal is determined by using N pairs of an actual squared value and an expected squared value which are corresponding to the projected first vector. A TM of the interference signal is detected by determining a TF of the interference signal which minimizes the TPR decision metric from among predetermined transmit format (TF) candidates.

Method and apparatus for blind detecting a transmission mode for interference cancellation

A method for receiving downlink data by a User Equipment (UE) in a wireless communication system is provided. The method includes checking a transmission parameter related to data transmitted from an interfering cell, determining presence/absence of an interference signal based on the transmission parameter, determining whether to apply Network Assisted Interference Cancellation and Suppression (NAICS) technology based on at least one of the transmission parameter or the presence/absence of the interference signal, and decoding the downlink data depending on whether to apply the NAICS technology.

Method and apparatus for receiving downlink data in wireless communication system

A method and an apparatus for measuring a link quality in a wireless communication are provided. The method of a receiver for measuring the link quality in the wireless communication system includes determining a modulation type for each of at least one reception stream received through at least one antenna based on a modulation order and channel information regarding each of signals transmitted from a plurality of transmission antennas, searching for a parameter corresponding to the determined modulation type from a pre-stored parameter table in which parameters for each modulation type are stored, and calculating a channel capacity for each of the at least one reception streams received through the at least one antenna by using the searched parameter.

Method and apparatus for measuring link quality in wireless communication system

An interference cancellation method and apparatus of user equipment in a cellular communication system is provided. The method includes receiving signals including a desired signal and an interference signal from one or more base stations; determining a maximum likelihood (ML) decision metric to determine a value 'l' of a rank indicator (RI), a value 'p' of a precoding matrix indicator (PMI), and a value &#x201c;q&#x201d; of a modulation (MOD) level of the interference signal; applying a logarithm to the ML decision metric, and applying a maximum-log approximation to a serving data vector and an interference data vector, which are included in the ML decision metric; determining the values of &#x201c;l,&#x201d; &#x201c;p,&#x201d; and &#x201c;q&#x201d; using the applied ML decision metric; and cancelling the interference signal from the received signals using the determined values of &#x201c;l,&#x201d; &#x201c;p,&#x201d; and &#x201c;q.&#x201d;

Interference cancellation method of user equipment in cellular communication system

Methods and apparatuses are provided for canceling interference at a User Equipment (UE) in a wireless communication system. A signal that includes a desired signal and an interference signal is received from at least one Base Station (BS). A random parameter is generated by projecting a vector of the received signal onto a set of projection vectors. A decision metric is determined using the random parameter. A Traffic to Pilot Ratio (TPR) that minimizes the decision metric with respect to both a transmission mode candidate group of the interference signal and a TPR candidate group of the interference signal is determined. The interference signal is canceled from the received signal using the TPR.

Method and apparatus for canceling interference signal of UE in wireless communication system

A method of transmitting data in a wireless communication, by a first Base Station (BS) is provided. The method includes receiving control information including information related to transmission of a Reference Signal (RS) of at least one second BS from the at least one second BS adjacent to the first BS and transmitting data by using a preset method based on the control information when an RS transmission mode of the at least one second BS is different from an RS transmission mode of the first BS.

Method and apparatus for transmitting and receiving data in wireless communication system

A method of removing noise from a two-channel signal includes receiving channel signals constituting the two-channel signal; obtaining a noise signal for each channel by removing a target signal from each channel signal by subtracting another channel signal multiplied by a weighted value from each channel signal; estimating a power spectral density (PSD) of diffuse noise from each channel signal; obtaining a target signal including an interference signal for each channel by removing the diffuse noise from each channel signal using the estimated PSD of the diffuse noise; obtaining the interference signal for each channel by removing the diffuse noise from the noise signal for each channel using the estimated PSD of the diffuse noise; and removing the interference signal from the target signal and the interference signal for each channel.

Apparatus and method for removing noise

Provided is an interference cancellation method by a User Equipment (UE) in a cellular communication system. The method includes receiving a signal including a desired signal and an interference signal from at least one base station; determining a universal constellation diagram based on at least one of a transmission parameter of the desired signal and a transmission parameter of the interference signal; blindly detecting an additional transmission parameter of the interference signal using the determined universal constellation diagram; and cancelling the interference signal from the received signal using the detected additional transmission parameter.

Interference cancellation scheme using constellation diagram

A method and an apparatus for link performance abstraction for a receiver employing Interference-Aware Communications (IAC) technology in a wireless communication system are provided. A method for operating a receiving apparatus for the link performance abstraction in the wireless communication system, includes receiving an Orthogonal Frequency Division Multiplexing (OFDM) over a plurality of spatial layers, splitting and post-processing the received signal based on the spatial layers, deriving a post-processing Signal-to-Interference-plus-Noise Ratio (SINR) of each spatial layer, converting the post-processing SINR of the spatial layers to a Mutual Information per coded Bit (MIB) adaptively tuned based on an instantaneous Interference-to-Signal Ratio (ISR), and estimating a Block Error Rate (BLER) from a mean of the MIB metrics of the spatial layers.

Link performance abstraction method and apparatus in a wireless communication system

A method for selecting an antenna in an orthogonalized spatial multiplexing system. Upon receipt of at least one symbol from a transmitter via multiple receive antennas, a receiver decodes each of the received symbols; determines a rotation angle between the received symbols, and selects an optimal subset of transmit antennas using a distance between vectors of the decoded symbols; generates feedback information including the determined rotation angle and the selected optimal subset, and transmits the generated feedback information to the transmitter. Upon receipt of the feedback information, the transmitter beam-forms an antenna corresponding to the optimal subset depending on the received feedback information, and transmits a data symbol to the receiver. The receiver detects each of data symbols received from the transmitter.

Apparatus and method for selecting antenna in an orthogonalized spatial multiplexing system

An apparatus for coding a pseudo orthogonal space-time block code in a transmitter using 4 transmission antennas of first to fourth transmission antennas. Upon receiving information symbol streams xxxxto be transmitted, a serial-to-parallel converter parallel-converts the received information symbol streams xxxxinto x,x,x,x. A pseudo orthogonal space-time block coding (PO-STBC) encoder codes the parallel-converted information symbol streams x,x,x,xusing a pseudo orthogonal space-time block coding scheme such that the information symbol streams x,x,x,xare transmitted via corresponding transmission antennas for first to fourth time periods.

Apparatus and method for coding/decoding pseudo orthogonal space-time block code in a mobile communication system using multiple input multiple output scheme

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Pocheon-si, South Korea

Heun-Chul Lee