where , is the linear precoder matrix (also called full-rate space-time block code in the MIMO community) of size . The integer parameter represents the time spreading of the precoder, . We restrict our study to unitary precoders, i.e., . The MIMO channel matrix has blocks on its diagonal and zeros elsewhere. Each block is associated to the transmission over the MIMO channel during one channel use. We can see as a new correlated MIMO channel and call a precoding time period the group of channel uses associated to the matrix . Finally, is the channel output and is an additive white gaussian noise with zero mean and variance per real component.

Joseph Jean Boutros 2005-05-07