1. A method for decoding a received signal in a multiple input/multiple output system having transmission characteristics approximated by the equation 
 y=Hs+n, wherein y is an N×1 vector describing a received signal, H is a channel matrix, wherein H=QR with an M×M triangular matrix R and an N×M unitary matrix Q, is a transmitted M×1 signal vector whose coordinate values are chosen from a constellation O containing A possible coordinate values, n is an N×1 vector of zero-mean noise entries, M is a number of transmitter sources, and N is a number of receiver sinks, said method comprising the step of finding an entry S in O for which s ^ = argmin s ∈ O  Rs - y ^  with ∥ ∥ being a norm other than the Euclidean l 2 -norm and ŷ=Q H y, and with Q H being the conjugate transpose of Q.