Iterative interference suppressor for wireless multiple-access systems with multiple receive antennas

摘要

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 sub channel 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.

主权项

1. A wireless terminal, comprising:
a plurality of antennas configured to receive multiple-access communication signals from a plurality of transmission sources; a plurality of RAKE receivers configured to separate the multiple-access communication signals into a plurality of constituent signals for each transmission source; a plurality of constituent-signal analyzers configured to generate a plurality of initial symbol estimates from the plurality of constituent signals; and one or more interference suppression units configured to generate, from the plurality of initial symbol estimates, a synthesized received signal for each antenna of the plurality of antenna, subtract the respective synthesized received signal from the multiple-access communication signal received by each antenna to obtain a plurality of residual signals for the plurality of antenna, combine the plurality of residual signals with the plurality of constituent signals to obtain interference-suppressed constituent signals, and generate a plurality of updated symbol estimates based on the interference-suppressed constituent signals.