Iterative interference suppressor for wireless multiple-access systems with multiple receive antennas
First Claim
1. A non-transitory computer-readable storage medium, comprising a plurality of instructions that, when executed, result in an apparatus:
- generating input symbol decisions for constituent signals of multiple-access communication signals received by a plurality of antennas;
processing the input symbol decisions to obtain updated symbol decisions, wherein said processing includes;
resolving each of a plurality of error signals corresponding to each of the plurality of antennas onto a signal basis for one or more transmission sources;
combining the resolved error signals across antennas to produce a combined signal;
scaling the combined signal by a stabilizing step size to produce a scaled signal; and
combining the combined signal with a weighted input vector; and
suppressing at least one of inter-cell and intracell interference in the multiple-access communication signals based on the updated symbol decisions.
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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.
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Citations
18 Claims
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1. A non-transitory computer-readable storage medium, comprising a plurality of instructions that, when executed, result in an apparatus:
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generating input symbol decisions for constituent signals of multiple-access communication signals received by a plurality of antennas; processing the input symbol decisions to obtain updated symbol decisions, wherein said processing includes; resolving each of a plurality of error signals corresponding to each of the plurality of antennas onto a signal basis for one or more transmission sources; combining the resolved error signals across antennas to produce a combined signal; scaling the combined signal by a stabilizing step size to produce a scaled signal; and combining the combined signal with a weighted input vector; and
suppressing at least one of inter-cell and intracell interference in the multiple-access communication signals based on the updated symbol decisions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory computer-readable storage medium, comprising a plurality of instructions, which when executed, result in an apparatus:
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processing constituent signals from multiple-access communication signals received by a plurality of antennas to generate input symbol decisions; and iteratively processing the input symbol decisions to suppress at least one of inter-cell and intracell interference in the multiple-access communication signals, wherein said iterative processing includes; resolving each of one or more error signals each corresponding to one of the plurality of antennas onto a signal basis for one or more transmission sources to produce one or more of resolved error signals; combining the one or more resolved error signals across antennas to produce a combined signal; scaling the combined signal by a stabilizing step size to produce a scaled signal; and combining the combined signal with a weighted input vector. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification