Method and system for providing multi-carrier synthesis
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United States of America Patent
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Issued Date -
Jan 25, 2007
app pub date -
Jul 25, 2006
filing date -
Jul 25, 2005
priority date (Note) -
Abandoned
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Abstract
A nyquist filter upsamples multiple input symbol streams. Separate first stage branch low-pass filters further upsample the streams. A tap at each filter has a delay different from the other branch(s) to extract symbols from different streams. The outputs of the low-pass filters are additively combined in one branch and are subtracted in another. The outputs from the additive and subtraction combiners are provided to corresponding multipliers that multiply by real cosine and sine functions, respectively. The outputs of the multipliers are alternatingly combined (alternates during every clock cycle between addition and subtraction) at a first stage combiner. A second stage processes the output of the first stage combiner similarly to processing performed by the first stage. The output of the second stage alternating combiner is the input symbol streams in baseband with carriers spaced apart by a predetermined frequency based on the real function used by the real multipliers.
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