Signal transformation method and apparatus
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United States of America Patent
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Apr 8, 2003
Grant Date -
Dec 13, 2001
app pub date -
Feb 5, 2001
filing date -
Oct 2, 1996
priority date (Note) -
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Abstract
A base station in a radio telecommunication system, transforms real digital wideband high-frequency signals into a set of complex digital baseband signals and vice versa. The base station receives a set of complex digital baseband signals having an 'I' and a 'Q' components. A portion of these signals are modulated and then converted into complex digital high-frequency signals. The complex digital high-frequency signals are then filtered via bilinear digital ladder bandpass filters to retrieve real digital narrowband high-frequency signals. The outputs of these filters are the same corresponding 'I' and 'Q' components at the narrowband frequencies. These signals are further combined to form real digital wideband high-frequency signals. Finally, the combined signals are converted through a D/A converter to real analog wideband high-frequency bandpass signals.
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