| 摘要 |
<P>PROBLEM TO BE SOLVED: To accelerate a scan speed and further to stably and surely perform scan control of a plurality of receiving channels even if an analog modulation channel is mixed, in receiving channel scan control for performing reception monitor only on a channel where an incoming signal is detected, by scanning the plurality of receiving channels while using a radio communication unit which receives a digital modulation signal. <P>SOLUTION: A clock signal or symbol that is sent while being superimposed on a digital modulation signal is detected or an eye pattern of a reception signal is detected in place of or together with conventional RSSI (Received Signal Strength Indicator) detection or noise detection, so that presence/absence of an incoming signal is determined. Furthermore, the clock signal is detected by over sampling the reception signal as a clock signal detection means and deviation of both the signals is automatically corrected so that a symbol acquisition timing coincides with a Nyquist point. <P>COPYRIGHT: (C)2007,JPO&INPIT |
