Iterative interference cancellation using mixed feedback weights and stabilizing step sizes

Abstract

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequencyselective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be 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).

1 . An interference canceller configured for performing at least one iteration for each of a plurality of input symbol estimates for producing updated interference-cancelled symbol estimates, the canceller comprising a weighting module, the weighting module configured to apply at least one symbol weight to the plurality of input symbol estimates, the at least one symbol weight comprising a function of an input symbol merit.