Agreed on “cubically”; the statement should read “resulting in a much-faster overall complexity scaling.” Thanks for spotting this.

]]>1) The latency of Gramma matrix calculator, more precisely the latency of Multiply Accumulator (MAC) is linearly proportional to the number of antenna of BS. The number of MAC is square proportional to the number of UE.

2) If we only utilize Matched Filter (MF) and Inverse of the Diagonal of the Gramma matrix for MU-MIMO detector. If the MF is implemented by a Matrix-Vector Multiplier Systolic Array, the latency of the MAC is proportional to the antenna of BS, and the size of Matrix-Vector Multiplier for is proportional to the number of user. ]]>