Patent ID: 9014253
Filing Date: 2015-04-21
Classification: H04L

Abstract:
1. A method for detecting sequences of digitally modulated symbols transmitted by multiple sources and received at a receiver, the method comprising: determining a real-domain representation that separately treats in-phase and quadrature components of a received vector, channel gains, and a transmitted vector transmitted by the multiple sources; processing the real-domain representation to obtain a triangular matrix; performing, at the receiver, a reduced-complexity search of a number of transmit sequences and at least one of: (i) hard-decision detection of a transmitted sequence and demapping of corresponding bits based on the reduced-complexity search of the number of transmit sequences, and (ii) generation of bit soft-output values based on the reduced-complexity search of the number of transmit sequences, the reduced-complexity search based on the triangular matrix; the reduced-complexity search including solving a minimization problem using values of a candidate sequence, the values of the candidate sequence obtained by the reduced-complexity search including repeating the considering and obtaining steps a number of times equal to a number of transmit antennas, each time associated with a different disposition of layers corresponding to the transmitted symbols, each layer being a reference layer in only one of the dispositions.