Adaptive antenna array for mobile communication
First Claim
1. A method for combining a plurality of antenna output signals, each antenna output signal being received from one of a plurality of branches fed from a corresponding plurality of antennas, each radio signal comprising a frame including a pseudo random training symbol and at least one data symbol, the method comprising:
- (a) determining a weighting factor for each branch based on power characteristics of the pseudo random training symbol; and
(b) combining the antenna output signals from each branch in accordance with the determined weighting factors to form a combined signal.
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Accused Products
Abstract
Pseudo random training symbols and/or a constant modulus pilot carrier in OFDM symbols are used to train an adaptive antenna array to cancel unwanted multipath signals and suppress interfering signals. Power variance and power level measurements taken from a plurality of antenna branches during the training symbols and/or the constant modulus pilot carrier are used to determine appropriate weights to be applied to each antenna branch.
245 Citations
25 Claims
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1. A method for combining a plurality of antenna output signals, each antenna output signal being received from one of a plurality of branches fed from a corresponding plurality of antennas, each radio signal comprising a frame including a pseudo random training symbol and at least one data symbol, the method comprising:
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(a) determining a weighting factor for each branch based on power characteristics of the pseudo random training symbol; and
(b) combining the antenna output signals from each branch in accordance with the determined weighting factors to form a combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio frequency receiver including an antenna array device for combining signals received by a plurality of antennas in a communications system where the antennas receive data signals that include a pseudo random training symbol and at least one data symbol, the antenna array device comprising:
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(a) an array controller, arranged to receive the data signals from each of the antennas, for determining a weighting factor for each antenna based on power characteristics of the pseudo random training symbol;
(b) a weighting device coupled to each antenna for weighting the data signal received by each antenna according to the weight factor determined for each antenna; and
(c) a combiner for receiving and combining the weighted data signals to form a combined data signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for steering an adaptive antenna array that includes a plurality of antennas in a communications system where the antennas receive and output data signals that include a training symbol and at least one data symbol, the training symbol including a first pseudo random subsymbol and a second subsymbol that substantially identical to the first subsymbol, the method comprising:
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(a) separating training symbol information from interfering noise signal information based on autocorrelation properties of the training symbol;
(b) determining a weighting factor for the signals received by each antenna, the weighting factor being determined from power characteristics of the separated training signal information; and
(c) combining the signals from each antenna in accordance with the determined weighting factors to form a combined signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for combining a plurality of antenna output signals, each antenna output signal being received from one of a plurality of branches fed from a corresponding plurality of antennas, each radio signal comprising a plurality of OFDM symbols including a constant modulus pilot carrier, the method including:
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(a) determining a weighting factor for each branch, the weighting factor being determined from power characteristics of the constant modulus pilot carrier; and
(b) combining the antenna output signals from each branch in accordance with the determined weighting factors to form a combined signal. - View Dependent Claims (22, 23, 24, 25)
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Specification