Interference selection and cancellation for CDMA communications
First Claim
Patent Images
1. A cancellation system comprising:
- a projection canceller configured to project a down-converted signal onto a subspace substantially orthogonal or oblique to an interference subspace corresponding to at least one interference signal, and an interference selector coupled to the projection canceller and configured to extract the at least one interference signal from the down-converted signal.
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Accused Products
Abstract
Interference cancellation for CDMA handsets comprises projecting a received signal onto a subspace that is substantially orthogonal to an interference subspace. Selection of the interference subspace includes extracting at least one interfering signal from the received signal. Interference selection may include calculating a signal-power threshold from which the presence or absence of interfering channels is determined. Receiver embodiments are configured for transmit and receive diversity.
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Citations
134 Claims
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1. A cancellation system comprising:
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a projection canceller configured to project a down-converted signal onto a subspace substantially orthogonal or oblique to an interference subspace corresponding to at least one interference signal, and an interference selector coupled to the projection canceller and configured to extract the at least one interference signal from the down-converted signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A cancellation system comprising:
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a projection cancellation means configured to project a down-converted signal onto a subspace substantially orthogonal or oblique to an interference subspace corresponding to at least one interference signal, and an interference selection means configured to process the down-converted signal for extracting therefrom the at least one interference signal. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A handset comprising:
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a projection canceller configured to project a down-converted signal onto a subspace substantially orthogonal or oblique to an interference subspace corresponding to at least one interference signal, and an interference selector coupled to the projection canceller and configured to extract the at least one interference signal from the down-converted signal. - View Dependent Claims (64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93)
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94. A method for canceling interference in a received signal comprising:
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providing for extracting at least one interference signal from a down-converted signal, and providing for projecting the down-converted signal onto a subspace substantially orthogonal or oblique to an interference subspace corresponding to the at least one interference signal. - View Dependent Claims (95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 133, 134)
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120. A method for calculating a threshold for a receiver configured to operate in a communication system employing transmit-diversity, the method comprising:
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providing for determining channel estimates, providing for estimating transmit antenna weights, providing for estimating at least one transmitted symbol, and providing for constructing the threshold from the channel estimates, the estimated antenna weights, and the at least one transmitted symbol. - View Dependent Claims (121, 122, 123, 124)
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125. An apparatus configured for calculating a threshold in a receiver configured to operate in a communication system employing transmit-diversity, the apparatus comprising:
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a channel estimator configured to determine channel estimates, a weight estimator configured to estimate transmit antenna weights to produce estimated channel weights, a symbol estimator configured to estimate at least one transmitted symbol to produce at least one transmitted symbol estimate, and a threshold determination module configured to calculate the threshold from the channel estimates, the estimated antenna weights, and the at least one transmitted symbol estimate. - View Dependent Claims (126, 127, 128)
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129. A handset configured to operate in a communication system employing transmit-diversity, the handset comprising:
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a channel estimator configured to determine channel estimates, a weight estimator configured to estimate transmit antenna weights to produce estimated channel weights, a symbol estimator configured to estimate at least one transmitted symbol to produce at least one transmitted symbol estimate, and a threshold determination module configured to calculate the threshold from the channel estimates, the estimated antenna weights, and the at least one transmitted symbol estimate. - View Dependent Claims (130, 131, 132)
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Specification