Abstract:
무선 센서 네트워크에서 임의 노드에서 발생되는 패킷에 대하여 다중화 여부를 판단한다. 패킷을 다중화하는 경우, 적어도 하나의 패킷들을 다중화하여 제1 길이의 프레임을 생성하여 전송한다. 제1 길이의 프레임은 제1 길이보다 작은 제2 길이를 가지는 데이터 유닛과 헤더 유닛을 포함하는 데이터부가 적어도 하나 다중화된 페이로드를 포함한다.
Abstract:
Disclosed are a low speed transmission system, a middle speed transmission system and a high speed transmission system. In this case, the low speed transmission system includes a convolution encoder for performing a forward error correction encoding of an input signal; a puncturing unit for puncturing the forward error correction encoded signal input from the convolution encoder; an interleaving unit for interleaving the punctured signal input from the puncturing unit; a waveform encoder for waveform-encoding the interleaved signal input from the interleaving unit by using an orthogonal and bi-orthogonal code; a repeat unit for repeating the waveform encoded signal input from the waveform encoder; and a modulation unit for modulating the repeated signal input from the repeat unit.
Abstract:
본 발명은 계층적 센서 네트워크 구조에서의 자원 식별자 발급 장치 및 자원 식별자 발급 방법에 관한 것으로서, 다수의 클라이언트에 의해서 개별적으로 센서 네트워크의 자원에 접근하고 제어할 수 있도록 계층적으로 센서 네트워크의 자원 식별체계를 부여하여 동일한 물리적인 자원에 대해 클라이언트 별로 각자 유일하게 식별할 수 있어 다수의 클라이언트가 다양한 관점에서 자원을 접근하고 제어할 수 있다.
Abstract:
PURPOSE: A rectifier, a received signal strength indicator using the same, and a receiver using the same are provided to improve linearity although a low voltage is supplied. CONSTITUTION: A received signal strength indicator(RSSI) includes six differential amplifiers, seven full wave rectifying circuits, a secondary low pass filter, and a DC offset cancelling unit. The six differential amplifiers form an amplifier chain. The six differential amplifiers amplify output signals of two band pass filters. One full wave rectifying circuit rectifies differential signals outputted by the two band pass filters. Six full wave rectifying circuits respectively rectify differential signals outputted by six differential amplifiers. Output signals of seven full wave rectifying circuits are merged by the secondary low pass filter and are filtered to generate a display voltage such as DC.
Abstract:
PURPOSE: A hierarchical sensor network structure and a resource identifier issue method thereof are provided to hierarchically grant a resource identification system to individually access and control resources of a sensor network. CONSTITUTION: A gateway(20) receives a sensing request. The gateway transmits the received sensing request to a sensor node. The gateway receives and collects sensing information from the sensor node to provide the same. Each of clients(10-10_n) transmits the sensing request to a lower layer of the gateway through the gateway. Each of clients receives the sensing information. [Reference numerals] (10) Client; (10_n) Client (n); (20) Gateway; (30) Sensor node
Abstract:
PURPOSE: A channel selection method and communication method are provided to convert a communication channel by sensing wireless interference from a Zigbee sensor network. CONSTITUTION: An interference sensing process is repeated(205). When interference is sensed, a channel hopping method is executed by considering a Wi-Fi channel in a current channel. It is determined whether a channel is available(211). When the available channel is not searched, a hopping sequence interval is controlled(215). It is searched whether the channel is available. When the available channel is searched, the available channel is used for communication. [Reference numerals] (205) Interference sensed?; (AA,CC,EE,KK,HH,II,OO,PP) No; (BB,DD,FF,GG,LL,JJ,MM,NN) Yes