The zero-forcing (ZF) and minimum mean square error (MMSE) based detectors can approach optimal performance in the uplink of massive multiple-input multiple-output (MIMO) systems. However. they require inverting a matrix whose complexity is cubic in relation to the matrix dimension. This can lead to the high computational effort. https://www.roneverhart.com/Redken-Color-Extend-Blondage-Conditioner/