Apparatus and method for multicarrier modulation and demodulation
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United States of America Patent
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Issued Date -
Feb 26, 2004
app pub date -
Aug 23, 2002
filing date -
Aug 23, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a method and apparatus for signal processing for signal modulation and demodulation. In signal processing the present invention maintains substantially identical gain and group delays between transmit in-phase (I) and transmit quadrature-phase (Q) paths by receiving a digital transmit I baseband signal and a digital transmit Q baseband signal of a first multicarrier communication signal. A digital transmit IF signal is digitally constructed from the transmit I and Q digital baseband signals including bandpass sampling and the digital transmit IF signal is converted to an analog transmit IF signal. The present invention additionally maintains substantially identical gain and group delays between receive I and Q paths.
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