Iterative interference suppressor for wireless multiple-access systems with multiple receive antennas
First Claim
1. An interference suppressor for suppressing at least one of inter-cell and intra-cell interference in multiple-access communication signals received by a plurality of antennas, comprising:
- a front-end processing module configured for receiving constituent signals of the received multiple-access communications signals and generating input symbol decisions; and
one or more interference suppression units configured for processing the input symbol decisions into updated symbol decisions, each of the one or more interference suppression units comprising;
a despreader configured to resolve each of a plurality of error signals corresponding to each of a plurality of antennas onto a signal basis for the one or more transmission sources for producing a plurality of resolved error signals;
a first combiner configured for combining the resolved error signals across antennas for producing a combined signal;
a stabilizing step-size module configured to scale the combined signal by a stabilizing step size for producing a scaled signal; and
a second combiner configured for combining the combined signal with a weighted input vector.
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Accused Products
Abstract
This invention teaches to the details of an interference suppressing receiver for suppressing intra-cell and inter-cell interference in coded, multiple-access, spread spectrum transmissions that propagate through frequency selective communication channels to a multiplicity of receive antennas. The receiver is designed or adapted through the repeated use of symbol-estimate weighting, subtractive suppression with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard RAKE-based hardware either within the RAKE (i.e., at the finger level) or outside the RAKE (i.e., at the user or subchannel symbol level). Embodiments may be employed in user equipment on the forward link or in a base station on the reverse link. It may be adapted to general signal processing applications where a signal is to be extracted from interference.
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Citations
20 Claims
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1. An interference suppressor for suppressing at least one of inter-cell and intra-cell interference in multiple-access communication signals received by a plurality of antennas, comprising:
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a front-end processing module configured for receiving constituent signals of the received multiple-access communications signals and generating input symbol decisions; and one or more interference suppression units configured for processing the input symbol decisions into updated symbol decisions, each of the one or more interference suppression units comprising; a despreader configured to resolve each of a plurality of error signals corresponding to each of a plurality of antennas onto a signal basis for the one or more transmission sources for producing a plurality of resolved error signals; a first combiner configured for combining the resolved error signals across antennas for producing a combined signal; a stabilizing step-size module configured to scale the combined signal by a stabilizing step size for producing a scaled signal; and a second combiner configured for combining the combined signal with a weighted input vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An interference suppression method for suppressing at least one of inter-cell and intracell interference in multiple-access communication signals received by a plurality of antennas, the method comprising:
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processing one or more received signals in a front-end processor to generate input symbol decisions; and performing iterative interference suppression to process the input symbol decisions, wherein said performing iterative interference suppression includes; resolving each of one or more error signals each corresponding to one of the plurality of antennas onto a signal basis for the one or more transmission sources for producing a one or more of resolved error signals; combining the one or more resolved error signals across antennas for producing a combined signal; scaling the combined signal by a stabilizing step size for producing a scaled signal; and combining the combined signal with a weighted input vector. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification