Image signal cancel-type heterodyne reception method and direct conversion orthogonal frequency division multiplexing reception method
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United States of America Patent
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Jul 7, 2009
Grant Date -
Aug 11, 2005
app pub date -
Apr 18, 2003
filing date -
Apr 22, 2002
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Abstract
According to an image signal cancel-type heterodyne reception method, I-phase and Q-phase intermediate-frequency signals can be modulated using two orthogonal signals, superimposed one on the other, amplified by one amplifier, and modulated using two modulated orthogonal signals, thereby amplifying I-phase and Q-phase signals by one amplifier. Therefore, it is possible to obtain a high image signal cancellation ratio with no difference in gain for both of the phases. According to a direct conversion orthogonal frequency division reception method, on the other hand, two-phase base-band signals can be amplified respectively by one amplifier to eliminate a difference in gain between amplifications of the two-phase base-bands, thereby realizing high non-interference between sub-carriers.
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