Methods for managing alignment and latency in interference suppression
First Claim
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1. An interference cancelling receiver, comprising:
- at least one symbol estimator configured to operate on a signal stream to produce one or more symbol estimates from the signal stream;
one or more interference estimators coupled to the at least one symbol estimator to produce one or more of interference estimates;
one or more storage structures configured to store the one or more interference estimates at one or more locations in the one or more storage structures that are offset from a reference address by a number of addresses representative of a temporal offset between a time reference associated with the reference address and the corresponding interference estimate; and
an interference estimate combiner configured to combine one or more interference estimates aligned to the time reference to produce a composite interference estimate.
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Abstract
An interference cancelling receiver combines data from multiple paths after aligning to transmitter timing, and uses either an equalizer or a Rake receiver to compute symbol estimates. Interference estimates are generated from the symbol estimates, and multiple interference estimates are combined after re-aligning the interference estimates to receiver timing. At least two segments of symbol estimates are computed for each segment of interference cancelled data.
Various techniques may be employed for controlling the latency and sequencing of these operations, and the subsystems within the canceller may use different processing clock speeds.
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15 Claims
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1. An interference cancelling receiver, comprising:
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at least one symbol estimator configured to operate on a signal stream to produce one or more symbol estimates from the signal stream; one or more interference estimators coupled to the at least one symbol estimator to produce one or more of interference estimates; one or more storage structures configured to store the one or more interference estimates at one or more locations in the one or more storage structures that are offset from a reference address by a number of addresses representative of a temporal offset between a time reference associated with the reference address and the corresponding interference estimate; and an interference estimate combiner configured to combine one or more interference estimates aligned to the time reference to produce a composite interference estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for performing interference cancellation comprising:
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computing symbol estimates from a combined data stream; processing the symbol estimates to produce modified symbol estimates; using said modified symbol estimates to create a plurality of interference estimates; aligning at least one of the plurality of interference estimates with respect to a time reference by storing the plurality of interface estimates at a plurality of locations in one or more storage structures that are offset from a reference address by a number of addresses representative of a temporal offset between the time reference and the corresponding interference estimate; combining the plurality of interference estimates aligned to the time reference to create a combined interference estimate; and using the combined interference estimate to create at least one interference cancelled signal stream. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification