Methods and systems for programmable digital down-conversion
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsBradley John MORRIS, Lars Johan THOREBÄCK
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Abstract
A radio communication apparatus operable over a wide range of frequencies including a signal processing device is provided. The device performs an analog to digital conversion at a predetermined sample rate independent of a selected frequency band within the wide range of frequencies to generate a digital signal, and digitally processes the digital signal to output a data signal at baseband associated with the selected frequency band.
Claims14
A radio communication apparatus operable over a wide range of frequencies, comprising:
- a signal processing device configured to receive an analog signal, to perform an analog to digital conversion at a predetermined sample rate independent of a selected frequency band within the wide range of frequencies to generate a digital signal, and to digitally process said digital signal to output a data signal at baseband associated with said selected frequency band;
- and
- a frequency band selector connected at least to the digital down sampler, and configured to provide information on the selected frequency band.
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A method of processing a modulated analog signal, comprising:
- selecting a targeted frequency band among a plurality of predetermined frequency bands;
- converting an analog signal into a digital signal at a sample rate independent of the targeted frequency band;
- quadrature demodulating the digital signal to output a complex signal;
- and
- filtering the complex signal to include a single image of the targeted one of the predetermined frequency bands, and down-sampling the filtered complex signal to output one sample out of each group of N sequential samples in an input digital signal, where N is an integer number larger than or equal to two and depends on the targeted frequency band, the filtering and down-sampling being performed using a polyphase filter.
A method of manufacturing a radio communication system operable over a wide frequency range including a plurality of frequency bands, comprising:
- mounting a quadrature demodulator, a complex channel filter and a down-sampler between an analog to digital converter and a baseband tuner on a substrate;
- and
- mounting a frequency band selector configured to provide operating parameters related to a targeted band among the plurality of frequency bands, to the down-sampler and to the complex channel filter.
A method of manufacturing a radio communication system operable over a wide frequency range including a plurality of frequency bands, comprising:
- mounting a quadrature demodulator and a polyphase filter between an analog to digital converter and a baseband tuner, on a substrate;
- and
- mounting a frequency band selector configured to provide operating parameters related to a targeted frequency band among the plurality of frequency bands, to the polyphase filter.
Dependencies are inferred from the claim text.