Construction of projection operators for interference cancellation
First Claim
1. A cancellation method comprising:
- providing a received signal that is decomposable into a signal of interest and a plurality of MAI-channel signals, providing for applying a confidence weight to each of the plurality of MAI-channel signals to produce a plurality of weighted MAI channel signals, and providing for projecting the received signal onto a signal space constructed from an interference-signal space corresponding to the plurality of weighted MAI channel signals to determine a parameter of the signal of interest.
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Accused Products
Abstract
Interference cancellation is performed in a CDMA receiver by projecting a received signal onto a subspace that is orthogonal to a signal selected for removal. An interference matrix or a combined interference vector is used to construct an interference-canceling projection operator. Confidence weights may be provided to components of the interference matrix or the interference vector based on estimation errors or relative strengths of interfering signals. Complexity reduction of the orthogonal projection operator may be achieved by providing for simplifying approximations that remove terms and operations. A linear transformation operator may be applied to the rows and/or columns of the interference matrix or the interference vector prior to construction of the orthogonal projection. Interference cancellation techniques may be configured for processing signals in a transmit-diversity system or a receive-diversity system using time and/or frequency-domain implementations and space and/or wave-number implementations of the transceiver.
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Citations
106 Claims
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1. A cancellation method comprising:
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providing a received signal that is decomposable into a signal of interest and a plurality of MAI-channel signals, providing for applying a confidence weight to each of the plurality of MAI-channel signals to produce a plurality of weighted MAI channel signals, and providing for projecting the received signal onto a signal space constructed from an interference-signal space corresponding to the plurality of weighted MAI channel signals to determine a parameter of the signal of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 104)
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11. A cancellation method comprising:
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providing a received signal that is decomposable into a signal of interest and at least one interference component, providing for applying a linear transformation to the at least one interference component to produce an at least one linearly transformed interference component, and providing for projecting the received signal onto a signal space constructed from an interference-signal space corresponding to the at least one interference component to determine a parameter of the signal of interest. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for producing a threshold from a received signal comprising:
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detecting at least one of a plurality of traffic channels in the received signal for producing at least one detected traffic channel, and selecting one or more of the at least one detected traffic channel for threshold determination according to predetermined criteria to produce at least one selected traffic channel. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for processing a composite signal, the method comprising the steps of:
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providing a received signal that is decomposable into a signal of interest and at least one interference component; and
providing for supplying at least one simplifying approximation to a projection operation configured to project the received signal onto a signal space constructed from an interference space comprising the at least one interference component. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A cancellation system comprising:
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a Rake receiver configured to decompose a received signal into a plurality of signal paths, including at least one signal-of-interest path and a plurality of MAI-channel paths, a weighted decision combiner configured to apply a confidence weight to each of the plurality of MAI-channel paths to produce a plurality of weighted MAI-channel signals, and a projection operator configured for projecting a signal space corresponding to the received signal onto a signal space constructed from an interference-signal space corresponding to the plurality of weighted MAI-channel signals. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A cancellation system comprising:
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a receiver configured to provide a received signal that is decomposable into a signal of interest and at least one interference component, a linear transformation operator configured to apply at least one linear transformation to the at least one interference component to produce an at least one linearly transformed interference component, and a projection operator configured for projecting the received signal onto a signal space constructed from an interference-signal space corresponding to the at least one interference component to determine a parameter of the signal of interest. - View Dependent Claims (53, 54, 55, 56)
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57. A system for receiving a signal, comprising:
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a Rake receiver configured to decompose a received signal into a signal of interest and at least one interference component; and
a projection operator configured for supplying at least one simplifying approximation to a projection operation configured to project the received signal onto a signal space constructed from an interference space comprising the at least one interference component. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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68. A handset comprising:
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a receiver configured to decompose a received signal into a plurality of signal paths, including at least one signal-of-interest path and a plurality of MAI-channel paths, a weighted decision combiner configured to apply a confidence weight to each of the plurality of MAI-channel paths to produce a plurality of weighted MAI-channel signals, and a projection operator configured for projecting a signal space corresponding to the received signal onto a signal space constructed from at least one interference space corresponding to the plurality of weighted MAI-channel signals. - View Dependent Claims (69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79)
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80. A handset configured for receiving a signal, comprising:
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a receiver configured to decompose a received signal into a signal of interest and at least one interference component; and
a projection operator configured for supplying at least one simplifying approximation to a projection operation, the projection operator configured to project the received signal onto a signal space constructed from an interference space comprising the at least one interference component. - View Dependent Claims (81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91)
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92. A threshold detector configured to generate a threshold from a received signal, the threshold detector comprising:
a multiple-access interference selection module configured for detecting at least one of a plurality of traffic channels in the received signal for producing at least one detected traffic channel, and selecting one or more of the at least one detected traffic channel for threshold determination according to predetermined criteria to produce at least one selected traffic channel. - View Dependent Claims (93, 94, 95, 96, 97, 98, 99, 100)
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101. A handset comprising:
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a receiver configured to provide a received signal that is decomposable into a signal of interest and at least one interference component, a linear transformation operator configured to apply at least one linear transformation to the at least one interference component to produce an at least one linearly transformed interference component, and a projection operator configured for projecting the received signal onto a signal space constructed from an interference-signal space corresponding to the at least one interference component to determine a parameter of the signal of interest. - View Dependent Claims (102, 103, 105, 106)
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Specification