Patent ID: 8705668

Claim:
A node in a wireless communication network, the node comprising a receiver arranged for receiving at least two signal streams from at least one user via at least one antenna, the signal streams comprising bit sequences, each received bit sequence constituting one symbol from a set of at least four symbols, the receiver further being arranged for evaluating which bit sequence that is most likely to have been received for a certain sent symbol for each signal stream by means of discarding certain possible bit sequences and keeping certain possible bit sequences, and furthermore, for the remaining possible bit sequences, being arranged for calculating metrics indicative of which bit sequence that initially is most likely to correspond to a certain sent symbol, the metrics further being used for calculation of an estimation for each received bit, which estimation is indicative of which bit that is most likely to correspond to a certain sent bit, where the receiver is arranged for addition of metric data for a certain signal stream corresponding to an added bit sequence for each case where the available metrics are incomplete for performing the estimation since either a bit of the value “1” or a bit of a value “0” is missing for said certain signal stream, the added bit sequence corresponding to the said bit sequence that initially is indicated to be most likely to correspond to a certain sent symbol, where the missing bit is inserted in the added bit sequence in the place where it is missing, wherein the bit sequence comprising the inserted missing bit further is chosen such that it also corresponds to a symbol with the shortest Euclidian distance to the symbol with the said corresponding bit sequence that initially is indicated to be most likely to correspond to a certain sent symbol.