Wideband adaptive beamforming methods and systems
First Claim
1. A beam forming system, comprising:
- an antenna, the antenna including a plurality of antenna elements;
one or more analog to digital converters, wherein each of the antenna elements is connected to an analog to digital converter; and
a processor, wherein the processor is operable to execute instructions to;
collect samples of the response of each of the antenna elements from the one or more analog to digital converters for a selected period of time;
sort the collected samples by frequency, wherein each of the collected samples is assigned to one of a plurality of frequency bins;
identify a signal present in each of the frequency bins as an interferer;
adjust any signals present in any frequency bin that is not identified as an interferer to a noise floor;
for each frequency bin, calculate a weight to place a null in an antenna beam pattern at a location corresponding to an interferer;
for each frequency bin, apply the calculated weight for a frequency bin to the collected samples associated with that frequency bin to create a weighted signal; and
generate a beam using the weighted signal, wherein the beam includes a null at the location corresponding to the interferer.
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Abstract
Wide band adaptive beam forming methods and systems are provided. The beam forming methods can include receiving signals at multiple antenna elements and digitizing samples of the received signals for some period of time. The samples are divided into sub-channels according to frequency, and interferers are identified as signals appearing across at least some minimum number of the sub-channels. After removing signals not identified as interferers from the collected signal information, that information is used to calculate weights for forming a beam having a null at the identified location of the interferer. The beam forming systems include multiple element antennas having arms in the form of a spiral, and processing hardware for performing adaptive beam forming.
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Citations
30 Claims
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1. A beam forming system, comprising:
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an antenna, the antenna including a plurality of antenna elements; one or more analog to digital converters, wherein each of the antenna elements is connected to an analog to digital converter; and a processor, wherein the processor is operable to execute instructions to; collect samples of the response of each of the antenna elements from the one or more analog to digital converters for a selected period of time; sort the collected samples by frequency, wherein each of the collected samples is assigned to one of a plurality of frequency bins; identify a signal present in each of the frequency bins as an interferer; adjust any signals present in any frequency bin that is not identified as an interferer to a noise floor; for each frequency bin, calculate a weight to place a null in an antenna beam pattern at a location corresponding to an interferer; for each frequency bin, apply the calculated weight for a frequency bin to the collected samples associated with that frequency bin to create a weighted signal; and generate a beam using the weighted signal, wherein the beam includes a null at the location corresponding to the interferer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for adaptive beamforming, comprising:
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receiving radio waves at a plurality of antenna elements; collecting samples of the antenna response to the radio waves at each of the antenna elements for a period of time by a processor; sorting the samples from each of the antenna elements into a plurality of different frequency bins by the processor, wherein each different frequency bin contains information regarding radio waves within a different range of frequencies; identifying a signal present in multiple ones of the different frequency bins as an interferer by the processor; after removing signals not identified as an interferer, calculating a plurality of weights to place a null within an antenna beam at a location corresponding to an interferer by the processor; and applying the weights by the processor to generate a beam having a null in the direction of the interferer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification