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 generating input symbol decisions; and
one or more interference suppression units configured for processing the input symbol decisions, each of the one or more interference suppression units comprising one or more of a soft-weighting module, a mixed-decision module, and a stabilizing step-size module to convert the input symbol decisions into updated symbol decisions;
wherein each of the one or more interference-suppression units is configured for processing signals received by each of the plurality of antennas to produce a plurality of resolved error signals; and
wherein the plurality of resolved error signals is produced by adding constituent signals for each of the plurality of antennas to corresponding scaled error signals to produce error signals for the one or more transmission sources, and resolving the error signals for the one or more transmission sources across the plurality of antennas onto the signal basis for the one or more transmission sources.
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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.
147 Citations
22 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 generating input symbol decisions; and one or more interference suppression units configured for processing the input symbol decisions, each of the one or more interference suppression units comprising one or more of a soft-weighting module, a mixed-decision module, and a stabilizing step-size module to convert the input symbol decisions into updated symbol decisions; wherein each of the one or more interference-suppression units is configured for processing signals received by each of the plurality of antennas to produce a plurality of resolved error signals; and wherein the plurality of resolved error signals is produced by adding constituent signals for each of the plurality of antennas to corresponding scaled error signals to produce error signals for the one or more transmission sources, and resolving the error signals for the one or more transmission sources across the plurality of antennas onto the signal basis for the one or more transmission sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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, the iterative interference suppression comprising one or more of soft weighting, performing mixed decisions, and scaling by a stabilizing step-size to convert the input symbol decisions into updated symbol decisions; wherein the step of iterative interference suppression comprises scaling by a stabilizing step-size, scaling by a stabilizing step size comprising; generating a stabilizing step size having a magnitude indicative of how far the input symbol decisions are from desired interference-suppressed symbol decisions in an iteration of the iterative interference suppression; and weighting an error signal with the stabilizing step size. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification