Abstract:
PURPOSE: A loss prevention system and method are provided to minimize power consumption by forming the loss prevention system by using human body communications of a digital direct transmission mode. CONSTITUTION: An electronic tag(2) is attached to belongings. A loss monitoring unit(1) transmits and receives tag information from the electronic tag by using a human body as a transmission media. The loss monitoring unit monitors whether the belongings are lost or not. A button unit(11) registers and searches the belongings. A display unit indicates information in regard to the belongings. The display unit displays an alarm message when the belongings are lost. An alarm generating unit generates sound or vibration when the belongings are lost. A human body communications modem executes human body communications with the electronic tag. A controller controls the whole operation of the button unit, the display unit, the alarm generating unit, and the human body communications modem.
Abstract:
PURPOSE: A device and a method for generating a preamble for a digital direct transmission system are provided to prevent a low frequency noise by generating the preamble through the combination of a diffusion coding, a pseudo noise code, and a line coding. CONSTITUTION: A preamble generating device(200) includes a PN(Pseudo Noise) code generating unit(210), a line coder(220), and a diffusion coder(230). The PN code generating unit generates a PN code. The PN code generating unit is comprised of an existing maximal code, a nonmaximal code, a gold code, or a kasami code generator. The line coder receives a PN code generated by the PN code generating unit. The line coder line-codes the PN code. The diffusion coder receives the PN code which is line-coded by the line coder. The diffusion coder performs the diffusion coding according to a walsh coding method.
Abstract:
트래픽 특성에 따른 패킷의 집합 통신 방법 및 장치를 개시한다. 패킷의 집합 통신 장치는, 복수의 맥 서비스 데이터 유닛(MSDU; MAC Service Data Unit) 및 상기 복수의 MSDU 각각에 대한 트래픽 특성 정보를 생성하는 상위 계층 관리부와, 상기 복수의 MSDU 각각에 대한 트래픽 특성 정보에 기초하여 상기 복수의 MSDU 각각에 대한 시퀀스 넘버를 결정하고, 상기 복수의 MSDU 각각에 대한 시퀀스 넘버에 따라서 집합 맥 프로토콜 데이터 유닛(MPDU; MAC protocol data unit)을 생성하는 맥 계층(MAC Layer) 관리부 및 상기 집합 MPDU를 목적지로 전송하는 물리 계층(PHY Layer) 관리부를 포함한다. 집합 전송, MSDU, MPDU
Abstract:
PURPOSE: A scheduling method for spatial reuse and a device therefor are provided to assign transmission chances to terminal pairs in the same time interval of a transmission interval of a noncompetitive method. CONSTITUTION: A control station transmits scheduling information to terminals(S101). The terminals interpret the scheduling information(S102). A terminal participating in transceiving data in the next chance measures a channel of a specific time interval(S103). The terminal reports a measured signal level value and identification information of the terminal participating in data receiving to the control station(S104). The control station reflects the reported information in generating the next scheduling information(S105).
Abstract:
PURPOSE: A transmitter, a receiver and a method for extending coverage in WLAN are provided to receive the data between the target receiver and neighboring devices through cooperative MIMO. CONSTITUTION: A group forming unit(510) builds a transmission group with neighboring devices capable of local area network communication. A distribution unit(520) distributes the transmitted data about the target receiver to neighboring devices. A communication unit(530) transmits the distributed data through the frequency band for the local area network to neighboring devices. The communication unit transmits the distributed data through the cooperative Multiple Input Multiple Output mode with the receiving group of the target receiver.
Abstract:
PURPOSE: It frequency-selectives the adaptive using the orthogonal code, by using the denotation carrying orthogonally the base band communications method minimizes interference between the sending code. CONSTITUTION: By using one denotation among a plurality of denotations having the different frequency band communications operates(S301). The proper party house is selected by using the correlation value of an plurality of denotations included in the transmitted test data as described above(S305).
Abstract:
There is provided a human body communication method and system using a frequency-selective baseband in order to transmit and receive data between communication devices that are coupled to a human body by using the human body as a communication channel. The human body communication method and system may be useful to maximize an efficiency of the frequency-selective spreading technology to enhance a processing gain of the Walsh code technology, and thus to reduce the interference between human bodies of users by adaptively selecting a frequency band of Walsh codes that are used for data communications according to the human body channel characteristics and the noise environments that are varied according to the ambient environments, and also construct a low-power and stable human body communication when there is a strong interference induced from other electronic equipments.
Abstract:
본 발명은 가변 비트 해상도 혹은 클락 주파수를 가지는 아날로그 디지털 변환기를 이용한 적응형 변조방식 및 그 장치에 관한 것으로, 수신기로부터 수신한 변조방식에 따라 송신할 데이터를 변조하는 변조부; 상기 수신기로부터 수신한 비트 해상도 혹은 클락 주파수를 이용하여 변조한 데이터를 아날로그 신호로 변환하는 디지털/아날로그 변환부; 및, 상기 아날로그 신호를 무선채널을 통해 수신기로 송신하는 RF 처리부를 포함하는 송신기와 무선채널을 통해 데이터를 수신하는 RF 처리부; 상기 RF 처리부를 통해 수신한 상기 데이터의 신호 대 잡음비(SNR: Signal to Noise Ratio)를 계산하는 신호 대 잡음비 계산부; 및, 계산한 상기 신호 대 잡음비를 이용하여 기설정한 설정 테이블에서 상응하는 변조방식과 비트 해상도를 검색하여 송신기로 송신하는 변조 제어부를 포함하는 수신기를 포함한다. 아날로그 디지털 변환기, 비트 해상도, 적응형 변조, 클락 주파수
Abstract:
A distance base controlled beam apparatus and a method thereof at the same time for suing a same channel are provided to reduce the interference with the other user terminal when performing communication between a user terminal and a service providing device. A user terminal is connected to a service providing device(S210). The distance between the service providing device and the user terminal is measured(S220). The user terminal controls the beam width and transmission power with reference to the measured distance information(S230). The user terminal transmits data request message to the service providing device. The data response message is received from the service providing device(S240). The user terminal transmits and receives the service providing device and data(S250).
Abstract:
PURPOSE: A motion contents based learning apparatus and a method thereof for maximizing the learning effect for maximizing the learning effect of the user are provided to present about a posture and motion which order should be for learning the motion. CONSTITUTION: A motion contents based learning apparatus includes a plurality of motion sensing sensors, a motion controller(20), and a plurality of motion correction sensors. The motion detection sensor is arranged to the body of a user with dispersion. The motion detection sensor obtains the position information signal toward the body part of a user. The motion control unit understands the user motion it analyzes the position information signal. The motion control unit produces the motion calibration signal in which it induces the motion correction and compares with the standards motion in which it provides the user motion in the motion contents.