Patent ID: 7809045
Filing Date: 2010-10-05
Classification: H04B,H04L

Abstract:
1. A reception method for communication over frequency-selective channels with a plurality of send antennas and a plurality of receive antennas, wherein said reception method is adapted to process data received by the receive antennas that, on sending, was successively: (A) modulated onto K channels, the number K being strictly greater than the number T of send antennas; (B) spread with an N×K periodic spreading matrix (W) or an N×K aperiodic spreading matrix (W (C) processed to be transmitted from the T send antennas; and wherein the reception method uses iteratively: first filtering by means of T linear filters adapted to process the received data, after subtraction of a multi-antenna interference (MAI) and intersymbol interference (ISI) estimate, to generate an evaluation ({circumflex over (x)}) of the chips sent after the spreading of the step (B), the first filtering by means of the T linear filters taking account of the spatial diversity of the plurality of receive antennas; before or after said first filtering, first subtraction of interference using an estimate of multi-antenna interference (MAI) and intersymbol interference (ISI) previously regenerated from information computed on the basis of an evaluation (ŝ) of the sent modulated data generated by a previous filtering operation; processing that is the converse of that of the sending step (C), using a reorganization of the chips ({circumflex over (x)}) evaluated previously; second filtering by means of K linear filters adapted to process the evaluation of the chips ({circumflex over (x)}), after subtracting an estimate of multi-user interference (MUI), to generate the evaluation (ŝ) of the sent modulated data before the spreading of the step (B), the second filtering by means of the K linear filters taking account of the spatial diversity of the plurality of receive antennas; before or after said second filtering, second subtraction of interference that uses an MUI interference estimate previously regenerated from information calculated on the basis of the evaluation (ŝ) of the sent modulated data generated by previous filtering; and processing to generate an MAI+ISI interference estimate and an MUI interference estimate from the data received, on the basis of information calculated on the basis of said evaluation (ŝ) of the sent modulated data, the MAI+ISI interference estimate and the MUI interference estimate being then sent recursively to the next first subtraction and the next second subtraction, respectively.