Embodiments of the present disclosure may generally relate to methods for processing a response matrix of a communication system. One example method may comprise dividing the response matrix into a plurality of clusters. The number of the clusters is associated with the number of subcarriers of the communication system, and the clusters are indexed in sequence as even-indexed clusters and odd-indexed clusters. The method may further comprise estimating data transmitted by a first set of transmit antennas of the communication system through a first subcarrier and a second subcarrier of the subcarriers associated with a first even-indexed cluster. The method may further comprise modifying a first receive vector of the communication system based on the estimated data transmitted by the first set of transmit antennas as a second receive vector of the communication system.