| 摘要 |
In a channel quality monitoring device comprising a phase detector for phase likelihood data of an input PSK modulated signal, an accumulator for an accumulated phase likelihood datum during a predetermined time interval, a BER calculating circuit for calculating a BER by using the accumulated datum, and a judging circuit for judging a channel quality by the BER, a pitch detector detects in the PSK modulated signal a selected fading pitch for making the BER calculating circuit produce as the BER an instantaneous BER at a time at which the time interval ends. Preferably, the pitch detector comprises an RSSI circuit for RSSI's of the PSK modulated signal and a pitch selector for selecting the instantaneous fading pitch from a plurality of fading pitches detected in the RSSI's. The BER calculating circuit comprises a plurality of BER calculator in correspondence to predetermined fading frequencies, relative to which BER's are preliminarily empirically decided versus the accumulated datum.
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