Patent ID: 8514924
Filing Date: 2013-08-20
Classification: H04B,H04J,H04L

Abstract:
1. A method of jointly demodulating and suppressing interference from a plurality of transmitted signals transmitted using a multi-antenna and/or multi-code transmission scheme, comprising: deriving a set of centroid-based values from subsets of constellation points associated with the transmitted signals for input to each non-final stage of a multi-stage demodulator; demodulating a group of signals input to each of the non-final stages using the corresponding set of centroid-based values as constellation points; suppressing residual interference associated with using the set of centroid-based values as constellation points for demodulating the group of signals input to each of the non-final stages; modeling the residual interference associated with the set of centroid-based values as colored noise; accounting for the colored noise in an overall noise model including other stream interference and additive noise; pre-filtering the group of signals based on the overall noise model to suppress overall colored noise at each non-final stage of the multi-stage demodulator; and demodulating a group of modified signals input to a final stage of the multi-stage demodulator using the subset of constellation points input to the final stage to determine a final symbol decision for the plurality of transmitted signals.