| 摘要 |
PROBLEM TO BE SOLVED: To provide satellite communication equipment which can prevent interference between a transmission signal and a receiving signal, without causing increase in the cost and size or restricting the frequency band. SOLUTION: In a complex multiplying circuit 224, the difference between transmitting frequency and receiving frequency, which is detected by a frequency difference detecting circuit 223, is subjected to complex multiplying to transmission data signals It and Qt. In the data signals It and Qt, the frequency term of e<SP>-jΔωt</SP>is subjected to complex multiplication, so that data signals It1 and Qt1, wherein phase is rotated by the difference between the transmitting frequency and the receiving frequency, are obtained. Weighting based on a tap coefficient obtained by a control part 22c is performed to the data signals It1 and Qt1 by using a weighting circuit 225, and data signals It2 and Qt2 are obtained. An I signal and a Q signal are multiplied by the data signals It2 and Qt2 using adders 204a, 204b. As a result, receiving signals Ir, Qr wherein the term of the frequency component -Δωis eliminated as the transmission signal interference component from the I signal and the Q signal can be obtained. COPYRIGHT: (C)2004,JPO
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