in terms of an improvement in receiver performance the processing was implemented as shown in fig3 in case a signal detection error is made in the first stage as shown in blocks 104 and 106 lmmse estimates are obtained as shown in block 108 for signals sent from both the transmit antennas otherwise immse processing is carried out as shown in block 110 the switching between immse and lmmse in v blast processing requires the information whether correct first stage decisions were made or not as stated herein before in general such information is not directly available and some metric should be devised to infer it this metric can be a function of additive noise variance propagation channel matrix etc once such a metric is developed the switching between immse and lmmse can be done in an automatic fashion the resulting technique is herein after referred to as u201c hybrid immse lmmse receiver processing scheme u201d one such technique of devising a metric that is based on computing the probability of making an incorrect decision in the first stage detection is now described herein below results are shown for the case of bpsk symbols which has also been extended to the case of a qpsk signal constellation given now the first stage detected symbols s prior to hard slicing the probability that an error has been made is given by p e u2062 u2062 1 u2062 s _.