Abstract:
PURPOSE: A method for automatically changing a frequency based on spectrum scan is provided to maintain an optimal communication quality by automatically changing an operating frequency into an optimal frequency. CONSTITUTION: A spectrum scan process using a spectrum scan method is performed(S310). Reception noise characteristics about total bandwidths are analyzed based on a signal level(S320). A deposit frequency table is generated according to the superiority of noise characteristics(S330). The deposit frequency table of the other party and the generated deposit frequency table are mutually exchanged(S340). A BER(Bit Error Rate)/RSSI(Received Signal Strength Indicator) of a frequency which is currently in operation are analyzed(S350). Frequency change is determined from the analyzed result of the BER/RSSI according to jamming or an interference status(S360). A frequency change process is performed(S370).
Abstract:
본 발명은 링 출력 전원 회로에서 링 출력 단락 시에 발생하는 과전류를 차단하기 위한 과전류 보호 회로를 제공한다. 이를 위한 본 발명은 링 출력 단락 시에 발생하는 과전류를 차단하는 전원 장치의 과전류 보호 회로에 있어서, 입력 전원을 유기하고, 유기된 전원을 정류 및 평활하여 직류 공급 전압을 발생하는 전원 공급부와, 상기 전원 공급부의 출력 그라운드에서 전류를 검출하는 과전류 검출부와, 상기 검출된 전류에 상응하는 전압을 입력받고, 상기 입력된 전압이 기준 전압 이상이면 동작을 오프하여 과전류를 차단하는 메인 펄스 폭 변조기를 구비한다.
Abstract:
PURPOSE: An apparatus for measuring a bit error rate in a spread spectrum communication system and a method therefor are provided to grasp the state of a wireless interval of the spread spectrum communication system by checking the bit error rate. CONSTITUTION: A transmission unit(310) has a bit error rate test pattern generating unit(311) and a Tx modem(315). The bit error rate test pattern generating unit(311) receives a transmission traffic clock signal and a transmission PN(Pseudo random Noise) period start signal, and generates a period bit error rate test pattern. The Tx modem(315) transmits the bit error rate test pattern. A reception unit(320) has a demodulating unit(325), a bit error rate test pattern generating unit(323), a comparing unit(327), and a bit error calculating unit(329). The demodulating unit(325) demodulates the received bit error rate test pattern. The bit error rate test pattern generating unit(323) receives a reception PN period start signal, and generates an Rx bit error rate test pattern. The comparing unit(327) receives the signals outputted from the demodulating unit(325) and the bit error rate test pattern generating unit(323), and compares the received signals. The bit error calculating unit(329) calculates a bit error by a signal received from the comparing unit(327).
Abstract:
본발명은애드혹네트워크기술에관한것으로서, 더상세하게는애드혹네트워크의 VoIP(Voice over Internet Protocol) 시스템구축을위한가입자계획및 SIP(Session Initiation Protocol) 처리통합운용방법에대한것이다. 본발명에따르면, 프록시개념을적용하여백본망과애드혹망간 VoIP(Voice over Internet Protocol) 서비스지원을위한프록시노드의기능을정립함으로써애드혹망내 SIP(Session Initiation Protocol) 등록메시지부하로인한망 성능저하문제를해결할수 있다.