Abstract:
For routing in a wireless mobile mesh network including a plurality of nodes, a node finds a reference point by projecting its position onto an imaginary line connecting a source node and a destination node to each other and finds a destination point based on the reference point and an optimum 1-hop transmission distance - the optimum 1-hop transmission distance being set in view of the number of hops in an entire routing path and a channel state at each of the hops. One of the nodes that are not selected as a routing node on the routing path is selected as the subsequent routing node in view of the destination point and subcarrier use of each of the nodes.
Abstract:
다중 입력 다중 출력 반복 수신기는, 송신기로부터 출력된 신호로부터 연판정 로그 우도 율 값을 검출한 후 검출한 연판정 로그 우도 율 값으로부터 경판정 값과 연판정 값을 추출하기 위해 디코딩한다. 경판정 값의 순환 중복 검사가 성공적으로 확인되었는지 판단한 후, 판단 결과에 따라 데이터 버스트의 순환 중복 검사 또는 연판정 값을 피드백하여 다중 입력 다중 출력 반복 수신기의 신호 복조 과정의 반복을 결정하거나, 버스트 단위의 신호를 조립하여 데이터에 대한 순환 중복 검사를 수행한다.
Abstract:
PURPOSE: A method and system for updating train control data by using a broadband wireless access system are provided to arbitrarily determine a train control data update point by determining the update point of the train control data through a ground device. CONSTITUTION: A ground control device (110) includes a ground function control unit (112) which generates train control data and a ground wireless communication unit (114). The ground wireless communication unit transmits the train control data including identification information to identify the train control data to a train device (120) through a wireless network. The train device includes a train wireless communication unit (122) which identifies the identification information included in the train control data and a train control functioning unit (124). The train control functioning unit updates the train control data according to the control of the train wireless communication unit. The ground control device communicates with the train device through the wireless network by a broadband wireless access communication method. [Reference numerals] (110) Ground control device; (112) Ground function control unit; (114) Ground wireless communication unit; (120) Train device; (122) Train wireless communication unit; (124) Train control functioning unit
Abstract:
PURPOSE: A communication device using a modulation technique and a communication method thereof are provided to increase the efficiency of inter-cell interference reduction and spectrum use. CONSTITUTION: A communication device which generates a multi-carrier modulation signal includes a controller(110), a central frequency band modulator(121), and an edge frequency band modulator(122). The controller supplies a control signal including an identifier corresponding to each of multiple sub-carriers. The central frequency band modulator generates a first modulation signal by modulating first data corresponding to one central frequency band sub-carrier among the multiple sub-carriers according to a first modulation mode based on a first control signal. The edge frequency band modulator modulates second data corresponding to an edge frequency band sub-carrier of the multiple sub-carriers according to a second modulation mode. [Reference numerals] (110) Controller; (121) Central frequency band modulator; (122) Edge frequency band modulator; (AA) Control signal 1; (BB) Data 1; (CC) First modulation signal; (DD) Modulation signal; (EE) Control signal 2; (FF) Data 2; (GG) Second modulation signal
Abstract:
PURPOSE: A mesh node synchronization method in a wireless mesh system is provided to modulate a preamble of a neighbor node and broadcasting information. CONSTITUTION: An automatic gain controller transmits a network setup signal received from a neighbor node to a PHY(PHYsical Layer)(S531b). The PHY synchronizes time or frequency by using a preamble of the network setting signal(S532b). The PHY transmits the location information of a starting point of a super frame of the network setting signal to a DSP(Digital Signal Processor). The DSP synchronizes the clock of a mesh node through the location information. [Reference numerals] (AA) Automatic gain control unit; (BB) Power on; (DD) Network setting signal searching time; (EE) Location information transfer of network setting signal/super frame starting point; (S520,CC) Initial network setting mode request; (S531b) Network setting signal/PPA_en signal transfer; (S532b) Time/frequency synchronization network setting signal decoding; (S533b) Super frame starting point correction; (S540,FF) Normal network setting mode request; (S550b) Network entrance
Abstract:
PURPOSE: A resource assignment device of a wireless communication system and a method thereof are provided to prevent the collision between time shaft resources and frequency shaft resources in a wireless communication system based on an OFDMA(Orthogonal Frequency Division Multiple Access). CONSTITUTION: A reception unit(720) receives a control message from a hop node of a communication node. An assignment control unit(730) collects the resource assignment information of two hop nodes and one hop node through the control message. The assignment control unit selects assignable transmission resources and assignable reception resources using the resource assignment information of the nodes. The assignment control unit individually assigns the transmission resources and reception resources to an assignable reception resource and the assignable transmission resource. [Reference numerals] (710) Transmission unit; (720) Reception unit; (730) Assignment control unit
Abstract:
본 발명은 전력 제어를 이용한 간섭의 분산 억제 방법에 관한 것이다. 본 발명은 인접 셀간의 정보 교환이 없이도, 분산된 방식에서 전력 제어를 통해 인접 셀간 간섭을 감소시킬 수 있다. 또한 미리 결정된 전력 벡터를 이용할 수도 있기 때문에, 여러 번의 기지국과 단말기간 피드백 채널을 이용한 정보 교환 없이도 전력을 제어할 수 있어 뛰어난 성능 향상을 가져올 수 있다. 전력 제어, 간섭, 분산 억제, 인접 셀