Abstract:
PURPOSE: An adaptive interference alignment method for time-variable multiuser MIMO interference channels is provided to estimate the channel of an uplink based on an estimated channel. CONSTITUTION: A first DL(DownLink) channel is estimated, and a repeated least square method is used to calculate a beam forming vector. When the channel does not vary much, an intrinsic value, an intrinsic vector and a new beam-forming vector are calculated through the first DL channel. If the channel varies much, a new beam-forming vector is acquired based on a predicted channel.
Abstract:
PURPOSE: An apparatus for amplifying electric power using predistortion is provided to maintain performance thereof in a low complexity. CONSTITUTION: The property of a power amplifier(40) identified through a simple modeling. The part having a nonlinearly characteristic is compensated based on the model. The power amplifier is comprised by cascade of a linear filter and serial section system having a nonlinearly characteristic. A predistorter(30) is comprised by cascade connection of a non-linear part(31) and a pre-equalizer(32) of a frequency domain. A coefficient extracting part(50) extracts nonlinear model coefficient and pre-equalizer coefficient. The coefficient extracting part transmits the nonlinear model coefficient and pre-equalizer coefficient to the predistorter.
Abstract:
본 발명은 무선 네트워크 환경에서의 수신신호 복호화 방법에 관한 것으로, 무선 네트워크 환경에서 수신신호에 포함되어 있는 간섭신호의 복호화가 가능함에 따라 수신신호에서 해당 간섭신호를 제거한 후 복호화함으로써, 복호화 복잡도를 감소시키고 보다 효율적으로 수신신호를 복호화하기 위한, 무선 네트워크 환경에서의 수신신호 복호화 방법을 제공하고자 한다. 이를 위하여, 본 발명은, 수신신호 복호화 방법에 있어서, 메인 송신기로부터의 수신신호 및 타 송신기로부터 수신한 간섭신호에서 해당 채널값 및 MCS(Modulation and Coding Scheme) 정보를 추출하는 단계; 상기 추출한 간섭신호의 채널값 및 MCS 정보를 이용하여 해당 목적지 수신기에서의 제 1 신호대간섭잡음비를 산출하는 단계; 상기 수신한 간섭신호의 세기를 이용하여 제 2 신호대간섭잡음비를 산출하는 단계; 및 상기 산출한 제 2 신호대간섭잡음비가 상기 산출한 제 1 신호대간섭잡음비를 초과함에 따라 상기 간섭신호를 복호화하여 제거한 후 상기 수신신호를 복호화하는 복호화단계를 포함한다. 무선 네트워크, 간섭신호 제거, 채널값, MCS(Modulation and Coding Scheme), 신호세기, 복호화
Abstract:
본 발명은, 온톨로지 구축시 클래스간 관계 설정을 위하여, 온톨로지 클래스를 나타내는 전문용어들이 포함된 문장의 구문분석 결과를 보여 주어, 온톨로지 구축자들이 관련된 클래스간 관계 설정시 편리하게 참조할 수 있게 한다. 많은 전문용어가 복합어인 것을 감안하여, 복합어 인식과 클래스간 관계 설정을 위하여 기능성 동사 처리 등의 기능을 기존 일반 구문분석에 결합하였다. 온톨로지 구축자는 본 도구가 제안해주는 클래스간 관계를 그대로 사용할 수도 있고, 또한 본 도구가 발견해 내지 못한 관계를 추가할 수도 있다. 또한 온톨로지 구축자에게 필요한 정보를 제공하거나 구축자로부터 제시된 개선사항을 반영하여 클래스간 관계를 수정할 수도 있다. 본 발명은 코퍼스를 이용한 온톨로지 구축에 이용된다. 온톨로지, 전문용어, 구문분석, 코퍼스, 기능성 동사
Abstract:
PURPOSE: An apparatus and method for radio communication are provided to decide the channel capacity of the radio channel in consideration of false alarm probability. CONSTITUTION: The channel capacity decision unit(110) decides the channel capacity of the radio channel in consideration of the false alarm probability. The determining parameter(120) decides the probability value for maximizing the channel capacity. The sensor(130) senses the radio channel based on in the probability value and the detection-length value. The system environment information collecting part collects the system environment information of the level user system about the priority user system about the radio channel and radio channel. The channel capacity decision unit decides the channel capacity.
Abstract:
PURPOSE: An automatic construction method and an automatic construction system of relations between ontology classes of technical terms using general domain corpus clustering are provided to overcome limitation of a technical term corpus with few corpora and automatically extract the relations between concepts. CONSTITUTION: A syntax analyzing device(11) extracts a specific technical term and a verb pair related to the specific technical term from a technical term domain to construct relations of a technical term ontology. A corpus extractor(13) extracts a general corpus consisting of syntaxes in which a verb is included based on the extracted word from a generic domain. A clustering device(15) clusters verbs related to the technical term through the syntax relation of the syntaxes in the extracted general corpus. An automatic class relation setup device(17) sets relations between classes configuring the technical term ontology.
Abstract:
본 발명은 다중 사용자 환경의 다중 안테나 시스템에서 공간 분할 다중 접속을 수행하기 위한 장치 및 방법에 관한 것으로서, 전체 사용자들의 채널 상태 정보를 이용하여 상기 공간 분할 다중 접속을 수행하기 위한 사용자들을 선택하는 과정과, 트리 검색(Tree Search)을 이용하여 상기 선택된 사용자들 각각에 할당할 송신 스트림(Stream) 수를 결정하는 과정을 포함하여, 상기 다중 사용자 다중 안테나 시스템의 용량을 증대시키고, 복잡도를 줄일 수 있는 이점이 있다. MIMO시스템, 송신 스트림, 다중 사용자, SINR, 공간 분할 다중접속(SDMA)
Abstract:
A pilot emitting relay and a channel estimation method using the same are provided to improve communication performance between a transmitter and the relay by enabling the transmitter and a receiver to estimate a channel to the relay separately from entire channel. A power measurer(110) measures a signal for a frequency band of a corresponding frame. A PET(Pilot Emitting Time) section setting unit(120) sets up a PET section by detecting a TTG or RTG section of a base station and a terminal. The relay transmits a pilot signal to the base station and the terminal in the PET section.
Abstract:
A method for determining the transmission path of a packet based on allowable delay time and a channel condition of the transmitted packet and a network device using the same are provided to determine a relay node relaying the packet between a source node and a destination node. A first relay node(501) transmitting a packet received from a source node transmits an RTS(Request To Send) message to nodes(503). Each node receiving the RTS message estimates a channel gain(507). The node in which the presumed channel gain is greater than the fixed setting value transmits CTS(Clear To Send) message including the presumed channel gain value. If the node transmitting the CTS message is one, the node transmitting the CTS message is determined as the second relaying node.
Abstract:
A system for removing an echo signal and estimating an echo channel by using a multi-antenna is provided to remove the echo signal through pre-processing/post-processing or echo channel extracting and relieve the restriction on the amplification factor of a relaying device through spatial multiplexing of a transmission/reception array antenna structure. A transmission device(100) transmits a transmission signal to a relay equipment(200). The relay equipment re-transmits the transmission signal to a receiving device(300) through the transmission array antenna. The relay equipment comprises an Rx-antenna(210), an echo signal removing module(230) and a transmission array antenna(240). The Rx-antenna receives the transmission signal from the transmission device and the echo signal through an echo channel, and then applies them to a vector generating module. The vector generating module creates a pre-processing vector, and then applies the generated vector to the echo signal removing module together with the transmission signal and echo signal.