PLURAL CARRIER SYNCHRONIZM DETECTION SYSTEM

摘要

PURPOSE:To demodulate all received carriers in the complete synchronizing state by generating plural pilot signals whose frequency interval is in the synchronizing relation with a reference frequency, sending them simultaneously and detecting the reference frequency from the plural pilot signals at the reception side to recover the reference carrier. CONSTITUTION:Plural pilot signals 1, 2 sent to the same signal band with the plural signals and in the synchronizing relation to the frequency of the signal group are used and the frequency of the local oscillator 21 of the frequency conversion circuit at the reception side is controlled so that the frequency of the received pilot signal after reception is in the synchronizing relation with the plural received signal frequencies and plural reception signals are detected synchronizingly based on the received pilot signal. Thus, a reference signal with excellent quality is obtained and plural reception signals are detected synchronizingly.