Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Postech Academy-industry Foundation

Ajou University Industry-academic Cooperation Foundation

Byung Chang Kang

Jong Ho Bang

Byung Moo Lee

Jin Hyeock Choi

Nam Jeong Lee

Jin Kyu Kang

Joon Hyuk Kang

Dong Soo Kim

Keun Woo Park

Jun Haeng Lee

Ki Il Kim

Tae Joon Park

Sung Jin Kim

June Koo Rhee

Jun Mo Kim

Jin Do Byun

Bum Man Kim

Nam Jung Lee

Jun Hyuk Kim

Hai-Young Lee

Yixin Shi

Edward Jung

Gyung Ho Lee

Ha Dong Jin

A method and a device for determining transmission power in a multi-antenna communication system are provided. The method for determining transmission power includes calculating the power consumption of a transmission device, calculating the capacity of the transmission device, and determining transmission power for maximizing the energy efficiency of the transmission device by using the power consumption and the capacity thereof.

Method and device for determining transmission power in multi-antenna communication system

A transmitter configured to support a multimode and a multiband, using radio frequency (RF) digital-to-analog converters (DACs), includes a first RF DAC configured to transmit a first signal in a first frequency band, and a second RF DAC configured to transmit a second signal in a second frequency band different from the first frequency band. The transmitter further includes an impedance controller configured to adjust impedance of one of the first RF DAC and the second RF DAC operating in an impedance matching mode to adjust a frequency range of another one of the first RF DAC and the second RF DAC operating in a data transmission mode.

Transmitter for supporting multimode and multiband using multiple radio frequency (RF) digital-to-analog converters (DAC) and control method of the transmitter

An antenna and a communication system with the antenna are provided. The antenna may include a first layer including a plurality of folded stubs, a second layer including a pattern of the folded stubs, and a third layer connected to ground is disposed between the first layer and the second layer.

Antenna and communication system including the antenna

A central control apparatus and method thereof include a traffic demand receiving unit, a traffic demand calculating unit, a base station efficiency calculating unit, and a base station management unit. The traffic demand receiving unit is configured to receive a required traffic demand and a current location of each of terminals. The traffic demand calculating unit is configured to calculate traffic of each of base stations to which a terminal is unassigned. The base station efficiency calculating unit is configured to calculate an energy efficiency of each of the base stations. The base station management unit configured to verify a base station with an optimum energy efficiency, to activate the base station with the optimum energy efficiency, and to assign the terminals of a corresponding region to the base station with the optimum energy efficiency.

Central control apparatus and method for energy efficiency of a base station in a mobile communication system

A method of determining a number of antennas, includes calculating a power used by a transmitting device. The method further includes calculating a channel capacity of the transmitting device. The method further includes determining a number of antennas of the transmitting device to be used based on the power and the channel capacity.

Method and apparatus for determining number of antennas in multiple input multiple output (MIMO) communication system

A method for determining a transmission power in a multi-input multi-output (MIMO) system based on a cooperative transmission is provided. The method includes setting a power constraint condition of a transmitter and target quality information of a receiver. The method further includes determining the transmission power to be allocated to the transmitter to transmit the data to the receiver based on the power constraint condition and the target quality information.

Method for determining transmission power in MIMO system based on cooperative transmission

Provided is a method and device for increasing energy efficiency by adaptively performing clipping with respect to an input signal. The method may adaptively determine a clipping ratio (CR) based on a modulation method of the communication device and perform clipping based on the determined CR.

Communication device and method for enhancing energy efficiency

Methods and apparatus for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in an MIMO-OFDM communication system is provided, in which the method for reducing the PAPR of the OFDM signal may identify interference generated in an MIMO communication system, and adjust a clipping ratio (CR) for an effect of a clipping distortion to be less than an effect of interference.

Method and apparatus for reducing peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal and transmitter

A system for saving energy through control of a sleep mode, and a method of operating the system are provided. The energy-saving system may enable a proxy device to maintain a minimum basic setup necessary for a communication when a host device enters a sleep mode, and may omit an operation performed based on the basic setup when the host device switches to a communication mode, thereby enabling a smooth switch between the sleep mode and the communication mode.

Computing device negotiating with a proxy device to control sleep mode and achieving energy saving

A method and apparatus for user scheduling in a multi-user multiple input multiple output (MIMO) communication system are provided. The method includes identifying a user group comprising user terminals. The method further includes comparing power consumptions based on the user group. The method further includes scheduling the user terminals based on the comparing.

Method and apparatus for user scheduling in multi-user multiple input multiple output (MIMO) communication system

Disclosed are a system and a method that generates image data that represent a speaker to be distinguished, and enables a mobile terminal to provide a video conference service using the image data that distinguishes the speaker. A video conference apparatus may include a speaker distinguishing unit to distinguish, as a speaker, a participant who is speaking from a plurality of participants in the video conference and an image data generating unit to generate image data that represents the distinguished participant differently from other participants.

Apparatus and method of video conference to distinguish speaker from participants

A system for allocating a wireless resource for a Space Division Multiple Access (SDMA) communication is provided. The system for allocating the wireless resource for the SDMA communication includes: a channel state recognition unit to recognize a channel state of wireless channels generated among adjacent nodes including a source node, a relay node, and a destination node; and a wireless resource allocation unit to control at least one of an amount of channel state information fed back from the destination node to the source node, and a relay level of a relay signal, the relay signal being generated by relaying a source signal transmitted from the source node, according to the channel state.

Method of allocating wireless resource for space division multiple access communication and wireless resource allocation system of enabling the method

Provided are a central processing unit (CPU) and method for executing a branch instruction of a CPU, which can protect user's data by preventing an error due to a computer virus and a hacker is provided. The CPU includes: a branch instruction verification unit which verifies whether a branch instruction is valid; and a branch instruction execution unit which executes the branch instruction when the branch instruction is valid. The method includes: verifying whether the branch instruction is valid; and not executing the branch instruction when the branch instruction is invalid.

Growing community of inventors

Yongin-si, South Korea

Byung Chang Kang