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In medium-size Massive MIMO systems, the minimum mean square error parallel interference cancellation (MMSE-PIC) based Soft-Input Soft-Output (SISO) detector is often used due to its relatively low complexity and good bit error rate (BER) performance. The computational complexity of MMSE-PIC for detecting a block of data is dominated by the computation of a Gram matrix and a matrix inversion. They have computational complexity of O(K 2 M ) and O(K 3 ), respectively, where K is the number ofdoi:10.1109/lwc.2015.2504366 fatcat:mpk45x5jybamfapogjqtdthhh4