A method includes generating a received signal vector from a signal received over a channel. The received signal vector includes a plurality of symbols encoded in accordance with a block code having a structure. A channel matrix estimated for the channel is transformed based on the structure of the block code to generate an aggregate channel matrix. The symbols are processed using the aggregate channel matrix. A system includes a front end unit configured to generate the received signal vector, a channel estimation unit configured to estimate the channel matrix, and a processing unit configured to generate the aggregate channel matrix and process the symbols using the aggregate channel matrix.