1. A method for estimating a vector of emitted symbols over a MIMO transmission channel emitted by a first plurality of emitting antennas, comprising: receiving a vector of received symbols on a second plurality of receiving antennas; and estimating said vector of emitted symbols by: determining a subset of all possible vectors of emitted symbols by defining intervals for each symbol of the vector of emitted symbols; wherein the intervals for each symbol of the vector of emitted symbols are defined by performing a sphere decoding process that replaces an unknown difference between symbols of the vector of emitted symbols to be evaluated and symbols of the vector of emitted symbols to be estimated with a predetermined factor; calculating a metric associated with a criterion for each vector of the subset of all possible vectors of emitted symbols; and selecting an estimation for said vector of emitted symbol as the vector of emitted symbols among said subset which minimizes said metric.