Sampling technique for digital beam former
AssigneeThe DIRECTV Group, Inc.
InventorsDonald C. D. Chang, Kar W. Yung, Urban A. Von der Embse
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Abstract
A mobile satellite payload 18 and a method for sampling communication signals 26 are provided. The mobile satellite payload 18 uses a plurality of receive radiating elements 24 within a phase array antenna 22 to convert the communication signals 26 to received signals [S(t)]. A plurality of low noise amplifiers (LNAs) 28 amplify the received signals [S(t)] to then be received by a plurality of analog-to-digital (A/D) converters 29. The A/D converters 29 transform the received signals [S(t)] into digital baseband signals [S″(t)].
Claims15
A method of sampling communication signals within a mobile satellite payload having a phase array antenna, receive radiating elements, a plurality of low noise amplifiers (LNAs) and a plurality of analog-to-digital (A/D) converters, comprising:
- receiving the communication signals with the receive radiating elements and forming received signals;
- amplifying said received signals within the plurality of LNAs to form amplified received signals;
- and
- downconverting said amplified received signals into digital baseband signals within the plurality of A/D converters by sampling the amplified received signals at a predetermined sampling frequency fs using A/D converters with an aperture time of 1/(A*fs), where A is a constant related to the A/D converters.
A mobile satellite payload comprising:
- a phase array antenna, wherein said phase array antenna comprises a plurality of receive radiating elements for forming received signals;
- a plurality of low noise amplifiers (LNAs) electrically coupled to said receive radiating elements for amplifying the received signals to form amplified received signals;
- and
- a plurality of analog-to-digital (A/D) converters electrically coupled to said LNAs, wherein said plurality of A/D converters downconverting said amplified received signals into digital baseband signals by sampling the amplified received signals at a predetermined sampling frequency fs using A/D converters with an aperture time of 1/(A*fs), where A is a constant related to the A/D converters.
A communication system comprising:
- an antenna for receiving a received signal;
- a low noise amplifier (LNA) electrically coupled to said antenna for amplifying the received signal to form an amplified received signal;
- and
- an analog-to-digital (A/D) converter electrically coupled to said LNA, wherein said A/D converter downconverts the amplified received signal into a digital baseband signal by sampling the amplified received signals at a predetermined sampling frequency fs using a A/D converter with an aperture time of 1/(A*fs), where A is a constant related to the A/D converter.
A method of sampling communication signals within a mobile satellite payload having a phase array antenna, receive radiating elements, a plurality of low noise amplifiers (LNAs) and a plurality of analog-to-digital (A/D) converters, comprising:
- receiving the communication signals through the use of the receive radiating elements and forming received signals;
- amplifying said received signals within the plurality of LNAs to form amplified received signals;
- downconverting said amplified received signals within the plurality of A/D converters;
- sampling said amplified received signals within the plurality of A/D converters at a predetermined sampling frequency fs using A/D converters with an aperture time of 1/(A*fs), where A is a constant related to the A/D converters;
- filtering said amplified received signals within the plurality of A/D converters;
- wherein the combination of downconverting, sampling, and filtering said received signals transforms said amplified received signals into digital baseband signals.
Dependencies are inferred from the claim text.