MONITORING DEVICE OF CDM(CODE DIVISION MULTIPLE) SYSTEM AND METHOD THEREOF, CAPABLE OF SIMPLY DETECTING THE WAVEFORM OF TRANSMISSION END OF THE CDM SYSTEM BY USING NARROW BAND CRYSTAL FILTER

摘要

PURPOSE: A monitoring device of a CDM(Code Division Multiple) system is provided to detect a waveform of a transmission end of a CDM system by using a narrowband crystal filter, and to evaluate the performance of the transmission end from the detected waveform, thereby simply detecting the waveform. CONSTITUTION: A switching portion(210) switches output signals of each unit of a CDM system(100), respectively. A microprocessor(260) outputs a control signal so that the switching portion(210) can switch the output signals in certain order, and controls a warning portion(290) so that the warning portion(290) can warn when an inputted waveform is out of a certain reference value range. An oscillator(250) outputs a frequency signal under control of the microprocessor(260). A receiver(220) multiplies a signal inputted through the switching portion(210) by an output frequency of the oscillator(250), and outputs a specific frequency band signal only. A filter portion(230) filters the outputted signal, and detects a certain band signal. A power sensor(240) detects a noise level signal of the received signal, detects the strength of a power signal, and outputs the power signal to the microprocessor(260). A memory(270) stores a reference value. The warning portion(290) warns an abnormal state through a warning sound.