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US 2004/0176045 A1Published application
Method and device for producing mobile radio signals
OwnerFrank Lillieinventor
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OwnerFrank Lillieinventor
Estimating the term…
A method is provided for producing mobile radio signals using DDS (direct digital frequency synthesis) and a modulator, wherein the method includes the following steps: A) an intermediate frequency is produced by controlling the DDS using a DDS control word and a DDS clock pulse frequency, and B) the intermediate frequency is transformed into an emission frequency of the mobile radio signals, using the modulator, according to a reference frequency of the modulator. According to the present invention, the reference frequency of the modulator is used as a DDS clock pulse frequency, the frequency being unmodified or divided by a division factor. In order to produce the intermediate frequency, the DDS control word is selected in such a way that it compensates fluctuations of the reference frequency of the modulator.
Method for generating mobile radio signals using a DDS (12) (direct digital synthesizer) and a modulator (14), comprising the following steps:
Method according to one of the preceding claims, characterized in that the DDS control word (S) is determined from the following equation:
Method according to one of the preceding claims, characterized in that the DDS control word (S) is generated from an output signal of another modulator (60), specifically a GMSK modulator.
Arrangement (52) for generating mobile radio signals, specifically according to the method according to one of the preceding claims, comprising:
Dependencies are inferred from the claim text.