Before revision: The received signals at the pilot sub-carriers of the first RF channel are stacked into a vector , , where is the matrix defined by:Clearly, the above formula is similar to that of the SISO case and can be solved using the LS method.
After revision: The received signals at the pilot sub-carriers of the first RF channel are stacked into a vector , where is the matrix defined by:Clearly, the above formula is similar to that of the SISO case and can be solved using the LS method.