Antenna signal processing systems
First Claim
1. A signal processing system for determining weights for an adaptive antenna, the antenna having a plurality of antenna elements each for receiving a signal comprising a plurality of subcarriers, the system comprising:
- a plurality of inputs for receiving signals from said plurality of antenna elements;
a time-to-frequency domain transformer for each input for transforming the signal from each input to a plurality of subcarrier signals;
a first weight determiner coupled to said inputs, before the time-to-frequency domain transformer in the signal path, and configured to determine a first set of weights, one for each input; and
a second weight determiner coupled to said first weight determiner and configured to determine, from the determination of said first set of weights, at least one second set of weights comprising a frequency-domain weight for a subcarrier signal derived from each of said inputs.
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Accused Products
Abstract
Antenna techniques particularly for orthogonal frequency division multiplexed (OFDM) communications systems. A signal processing system determines weights for an adaptive antenna, the antenna including plural antenna elements each receiving a signal including plural subcarriers. The system includes plural inputs for receiving signals from the antenna elements, a time-to-frequency domain transformer for each input for transforming the signal from each input to a plurality of subcarrier signals, a first weight determiner coupled to the inputs, before the time-to-frequency domain transformer in the signal path, and configured to determine a first set of weights, one for each input, and a second weight determiner coupled to the first weight determiner and configured to determine, from the determination of the first set of weights, at least one second set of weights including a frequency-domain weight for a subcarrier signal derived from each of the inputs.
37 Citations
44 Claims
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1. A signal processing system for determining weights for an adaptive antenna, the antenna having a plurality of antenna elements each for receiving a signal comprising a plurality of subcarriers, the system comprising:
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a plurality of inputs for receiving signals from said plurality of antenna elements; a time-to-frequency domain transformer for each input for transforming the signal from each input to a plurality of subcarrier signals; a first weight determiner coupled to said inputs, before the time-to-frequency domain transformer in the signal path, and configured to determine a first set of weights, one for each input; and a second weight determiner coupled to said first weight determiner and configured to determine, from the determination of said first set of weights, at least one second set of weights comprising a frequency-domain weight for a subcarrier signal derived from each of said inputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of determining weights for an adaptive antenna, the antenna having a plurality of antenna elements each for receiving a signal comprising a plurality of subcarriers, the method comprising:
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receiving a plurality of signals from said plurality of antenna elements; transforming each of said plurality of received signals into a plurality of subcarrier signals; determining a first set of weights, one for each received signal; and
determining, using the determination of said first set of weights, at least one second set of weights comprising a frequency-domain weight for a subcarrier signal derived from each of said received signal inputs signals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method of adaptive beamforming for an OFDM antenna comprising a plurality of antenna elements, the method comprising:
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applying a first beamforming algorithm in the time domain to determine at least one antenna beam direction; and calculating a set of weights for application in the frequency domain to versions of at least one subcarrier, each version of the subcarrier being received by a corresponding one of the antenna elements; said set of weights being calculated using said at least one antenna beam direction.
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41. A method of calculating weights for an array antenna for receiving an orthogonal frequency division multiplexed (OFDM) signal comprising a plurality of subcarriers, the method comprising:
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determining, in a time domain, a direction of arrival of the OFDM signal at the array antenna; and calculating at least one set of weights for application to the subcarriers of the OFDM signal in a frequency domain using said direction of arrival. - View Dependent Claims (42)
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43. A processing system for an adaptive antenna, the processing system configured to calculate weights for an array antenna for receiving an orthogonal frequency division multiplexed (OFDM) signal comprising a plurality of subcarriers, the system adapted for:
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determining, in a time domain, a direction of arrival of the OFDM signal at the array antenna; and calculating at least one set of weights for application to the subcarriers of the OFDM signal in a frequency domain using said direction of arrival.
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44. A processing system for an adaptive antenna, the processing system configured to calculate weights for an array antenna for receiving an orthogonal frequency division multiplexed (OFDM) signal comprising a plurality of subcarriers, the system adapted for:
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determining, in a time domain, a direction of arrival of the OFDM signal at the array antenna; and calculating a plurality of said sets of weights, one for each subcarrier of the OFDM signal in the frequency domain, using said direction of arrival.
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Specification