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US 6,639,937 B2Granted
Method and apparatus for producing spread-coded signals
AssigneeInfineon Technologies AG
InventorsMarkus Doetsch, Peter Jung, Jörg Plechinger, Peter Schmidt, Michael Schneider, Tideya Kella
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Abstract
Transmission data that will be transmitted is coded and thus band-spread using a spread code. The band-spread transmission data is also coded using a scrambling code. The scrambling process is followed by pulse shaping, frequency correction, and DC offset and/or amplitude compensation for the band-spread and scrambled transmission data.
Claims27
A method for producing spread-coded signals, which comprises:
- coding and band-spreading transmission data using a spread code to obtain band-spread transmission data;
- coding the band-spread transmission data using a scrambling code to obtain band-spread and scrambled transmission data and then pulse shaping the band-spread and scrambled transmission data;
- subjecting the band-spread and scrambled transmission data to digital offset frequency correction;
- using a rotation angle for the frequency correction being represented as a linear combination of microrotations;
- performing the microrotations by selectively using a CORDIC algorithm as a function of a frequency offset;
- and
- subjecting the band-spread and scrambled transmission data to an operation selected from the group consisting of a DC offset compensation operation and an amplitude compensation operation.
4 more elements
An apparatus for producing spread-coded signals, comprising:
- a spread coding device for coding transmission data using a spread code to obtain spread-coded transmission data, the transmission data being for subsequent transmission;
- a scrambling device for scrambling the spread-coded transmission data with a scrambling code;
- and
- a signal preprocessing device receiving the transmission data from said scrambling device;
- said signal preprocessing device including a device for pulse shaping;
- said signal preprocessing device including a device for digital frequency correction;
- said digital frequency correction device including microrotation units connected in series;
- said microrotation units using a CORDIC algorithm for correcting any frequency offset and being driven selectively as a function of the frequency offset;
- and
- said signal preprocessing device including a given device for performing an operation selected from the group consisting of a DC offset compensation operation and an amplitude compensation operation.
7 more elements
Dependencies are inferred from the claim text.