Low-complexity MMSE signal detection algorithm based on BiCGSTAB method for uplink massive MIMO systems

For large-scale multiple-input multiple-output (MIMO) systems, the near-optimal algorithm of minimum mean square error (MMSE) method is widely used for uplink signal detection, but the matrix inversion process leads to high computational complexity. In this paper, a low-complexity signal detection algorithm based on biconjugate gradient stabilized (BiCGSTAB) method is proposed. A special property of the MMSE filtering matrix indicates the appropriateness of this algorithm and the computational complexity analysis shows that this method is capable to reduce the complexity from O(K3) to O(K2) and can be easier to implement on FPGA. Finally, simulation result verifies the advantage of BiCGSTAB algorithm over other stationary iterative algorithms.